Demo__

实现MyBatis Mapper XML文件增量动态刷新，自动加载，热加载，热部署

博客分类：

Java
MyBatis

最初启动服务后Mapper XML文件，必须重启服务才能生效，这样就大大影响了我们的开发效率。

网上同学们也有实现类似功能，但都是全部清空，全部刷新XML，这样硬件消耗比较严重，加载时间也比较长。我们只修改了几行SQL就没有必要全部加载，只需要加载修改的问题就行了。

后来为了急需解决这个问题，进行修改MyBatis源码实现Mapper XML增量刷新，直接覆盖方式实现，使用classloader的加载机制优先加载，并应用到了jeesite中，但是经过MyBatis几次升级后，不得不需要重新修改，部署也麻烦，入侵性太强。

周末有幸又重新研究下源代码将刷新部分，分离出来，实现MyBatis Mapper文件动态重新加载，只加载修改的文件，今天分享出来，不多说，看源码，注释很详细：

Java代码

/**
* Copyright (c) 2012-Now https://github.com/thinkgem/jeesite.
*/
package com.thinkgem.jeesite.mybatis.thread;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import org.apache.commons.lang3.StringUtils;
import org.apache.ibatis.builder.xml.XMLMapperBuilder;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.session.Configuration;
import org.apache.log4j.Logger;
import org.springframework.core.NestedIOException;
import org.springframework.core.io.Resource;
import com.google.common.collect.Sets;
/**
* 刷新MyBatis Mapper XML 线程
* @author ThinkGem
* @version 2016-5-29
*/
public class MapperRefresh implements java.lang.Runnable {
public static Logger log = Logger.getLogger(MapperRefresh.class);
private static String filename = "/mybatis-refresh.properties";
private static Properties prop = new Properties();
private static boolean enabled; // 是否启用Mapper刷新线程功能
private static boolean refresh; // 刷新启用后，是否启动了刷新线程
private Set location; // Mapper实际资源路径
private Resource[] mapperLocations; // Mapper资源路径
private Configuration configuration; // MyBatis配置对象
private Long beforeTime = 0L; // 上一次刷新时间
private static int delaySeconds; // 延迟刷新秒数
private static int sleepSeconds; // 休眠时间
private static String mappingPath; // xml文件夹匹配字符串，需要根据需要修改
static {
try {
prop.load(MapperRefresh.class.getResourceAsStream(filename));
} catch (Exception e) {
e.printStackTrace();
System.out.println("Load mybatis-refresh “"+filename+"” file error.");
}
enabled = "true".equalsIgnoreCase(getPropString("enabled"));
delaySeconds = getPropInt("delaySeconds");
sleepSeconds = getPropInt("sleepSeconds");
mappingPath = getPropString("mappingPath");
delaySeconds = delaySeconds == 0 ? 50 : delaySeconds;
sleepSeconds = sleepSeconds == 0 ? 3 : sleepSeconds;
mappingPath = StringUtils.isBlank(mappingPath) ? "mappings" : mappingPath;
log.debug("[enabled] " + enabled);
log.debug("[delaySeconds] " + delaySeconds);
log.debug("[sleepSeconds] " + sleepSeconds);
log.debug("[mappingPath] " + mappingPath);
}
public static boolean isRefresh() {
return refresh;
}
public MapperRefresh(Resource[] mapperLocations, Configuration configuration) {
this.mapperLocations = mapperLocations;
this.configuration = configuration;
}
@Override
public void run() {
beforeTime = System.currentTimeMillis();
log.debug("[location] " + location);
log.debug("[configuration] " + configuration);
if (enabled) {
// 启动刷新线程
final MapperRefresh runnable = this;
new Thread(new java.lang.Runnable() {
@Override
public void run() {
if (location == null){
location = Sets.newHashSet();
log.debug("MapperLocation's length:" + mapperLocations.length);
for (Resource mapperLocation : mapperLocations) {
String s = mapperLocation.toString().replaceAll("\\\\", "/");
s = s.substring("file [".length(), s.lastIndexOf(mappingPath) + mappingPath.length());
if (!location.contains(s)) {
location.add(s);
log.debug("Location:" + s);
}
}
log.debug("Locarion's size:" + location.size());
}
try {
Thread.sleep(delaySeconds * 1000);
} catch (InterruptedException e2) {
e2.printStackTrace();
}
refresh = true;
System.out.println("========= Enabled refresh mybatis mapper =========");
while (true) {
try {
for (String s : location) {
runnable.refresh(s, beforeTime);
}
} catch (Exception e1) {
e1.printStackTrace();
}
try {
Thread.sleep(sleepSeconds * 1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}, "MyBatis-Mapper-Refresh").start();
}
}
/**
* 执行刷新
* @param filePath 刷新目录
* @param beforeTime 上次刷新时间
* @throws NestedIOException 解析异常
* @throws FileNotFoundException 文件未找到
* @author ThinkGem
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
private void refresh(String filePath, Long beforeTime) throws Exception {
// 本次刷新时间
Long refrehTime = System.currentTimeMillis();
// 获取需要刷新的Mapper文件列表
List fileList = this.getRefreshFile(new File(filePath), beforeTime);
if (fileList.size() > 0) {
log.debug("Refresh file: " + fileList.size());
}
for (int i = 0; i < fileList.size(); i++) {
InputStream inputStream = new FileInputStream(fileList.get(i));
String resource = fileList.get(i).getAbsolutePath();
try {
// 清理原有资源，更新为自己的StrictMap方便，增量重新加载
String[] mapFieldNames = new String[]{
"mappedStatements", "caches",
"resultMaps", "parameterMaps",
"keyGenerators", "sqlFragments"
};
for (String fieldName : mapFieldNames){
Field field = configuration.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
Map map = ((Map)field.get(configuration));
if (!(map instanceof StrictMap)){
Map newMap = new StrictMap(StringUtils.capitalize(fieldName) + "collection");
for (Object key : map.keySet()){
try {
newMap.put(key, map.get(key));
}catch(IllegalArgumentException ex){
newMap.put(key, ex.getMessage());
}
}
field.set(configuration, newMap);
}
}
// 清理已加载的资源标识，方便让它重新加载。
Field loadedResourcesField = configuration.getClass().getDeclaredField("loadedResources");
loadedResourcesField.setAccessible(true);
Set loadedResourcesSet = ((Set)loadedResourcesField.get(configuration));
loadedResourcesSet.remove(resource);
//重新编译加载资源文件。
XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(inputStream, configuration,
resource, configuration.getSqlFragments());
xmlMapperBuilder.parse();
} catch (Exception e) {
throw new NestedIOException("Failed to parse mapping resource: '" + resource + "'", e);
} finally {
ErrorContext.instance().reset();
}
System.out.println("Refresh file: " + mappingPath + StringUtils.substringAfterLast(fileList.get(i).getAbsolutePath(), mappingPath));
if (log.isDebugEnabled()) {
log.debug("Refresh file: " + fileList.get(i).getAbsolutePath());
log.debug("Refresh filename: " + fileList.get(i).getName());
}
}
// 如果刷新了文件，则修改刷新时间，否则不修改
if (fileList.size() > 0) {
this.beforeTime = refrehTime;
}
}
/**
* 获取需要刷新的文件列表
* @param dir 目录
* @param beforeTime 上次刷新时间
* @return 刷新文件列表
*/
private List getRefreshFile(File dir, Long beforeTime) {
List fileList = new ArrayList();
File[] files = dir.listFiles();
if (files != null) {
for (int i = 0; i < files.length; i++) {
File file = files[i];
if (file.isDirectory()) {
fileList.addAll(this.getRefreshFile(file, beforeTime));
} else if (file.isFile()) {
if (this.checkFile(file, beforeTime)) {
fileList.add(file);
}
} else {
System.out.println("Error file." + file.getName());
}
}
}
return fileList;
}
/**
* 判断文件是否需要刷新
* @param file 文件
* @param beforeTime 上次刷新时间
* @return 需要刷新返回true，否则返回false
*/
private boolean checkFile(File file, Long beforeTime) {
if (file.lastModified() > beforeTime) {
return true;
}
return false;
}
/**
* 获取整数属性
* @param key
* @return
*/
private static int getPropInt(String key) {
int i = 0;
try {
i = Integer.parseInt(getPropString(key));
} catch (Exception e) {
}
return i;
}
/**
* 获取字符串属性
* @param key
* @return
*/
private static String getPropString(String key) {
return prop == null ? null : prop.getProperty(key);
}
/**
* 重写 org.apache.ibatis.session.Configuration.StrictMap 类
* 来自 MyBatis3.4.0版本，修改 put 方法，允许反复 put更新。
*/
public static class StrictMap extends HashMap {
private static final long serialVersionUID = -4950446264854982944L;
private String name;
public StrictMap(String name, int initialCapacity, float loadFactor) {
super(initialCapacity, loadFactor);
this.name = name;
}
public StrictMap(String name, int initialCapacity) {
super(initialCapacity);
this.name = name;
}
public StrictMap(String name) {
super();
this.name = name;
}
public StrictMap(String name, Mapextends V> m) {
super(m);
this.name = name;
}
@SuppressWarnings("unchecked")
public V put(String key, V value) {
// ThinkGem 如果现在状态为刷新，则刷新(先删除后添加)
if (MapperRefresh.isRefresh()) {
remove(key);
MapperRefresh.log.debug("refresh key:" + key.substring(key.lastIndexOf(".") + 1));
}
// ThinkGem end
if (containsKey(key)) {
throw new IllegalArgumentException(name + " already contains value for " + key);
}
if (key.contains(".")) {
final String shortKey = getShortName(key);
if (super.get(shortKey) == null) {
super.put(shortKey, value);
} else {
super.put(shortKey, (V) new Ambiguity(shortKey));
}
}
return super.put(key, value);
}
public V get(Object key) {
V value = super.get(key);
if (value == null) {
throw new IllegalArgumentException(name + " does not contain value for " + key);
}
if (value instanceof Ambiguity) {
throw new IllegalArgumentException(((Ambiguity) value).getSubject() + " is ambiguous in " + name
+ " (try using the full name including the namespace, or rename one of the entries)");
}
return value;
}
private String getShortName(String key) {
final String[] keyparts = key.split("\\.");
return keyparts[keyparts.length - 1];
}
protected static class Ambiguity {
private String subject;
public Ambiguity(String subject) {
this.subject = subject;
}
public String getSubject() {
return subject;
}
}
}
}

/**
 * Copyright (c) 2012-Now https://github.com/thinkgem/jeesite.
 */
package com.thinkgem.jeesite.mybatis.thread;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import org.apache.commons.lang3.StringUtils;
import org.apache.ibatis.builder.xml.XMLMapperBuilder;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.session.Configuration;
import org.apache.log4j.Logger;
import org.springframework.core.NestedIOException;
import org.springframework.core.io.Resource;

import com.google.common.collect.Sets;

/**

刷新MyBatis Mapper XML 线程
@author ThinkGem
@version 2016-5-29
*/
public class MapperRefresh implements java.lang.Runnable {

public static Logger log = Logger.getLogger(MapperRefresh.class);

private static String filename = “/mybatis-refresh.properties”;
private static Properties prop = new Properties();

private static boolean enabled; // 是否启用Mapper刷新线程功能
private static boolean refresh; // 刷新启用后，是否启动了刷新线程

private Set location; // Mapper实际资源路径

private Resource[] mapperLocations; // Mapper资源路径
private Configuration configuration; // MyBatis配置对象

private Long beforeTime = 0L; // 上一次刷新时间
private static int delaySeconds; // 延迟刷新秒数
private static int sleepSeconds; // 休眠时间
private static String mappingPath; // xml文件夹匹配字符串，需要根据需要修改

static {
```
 try {
 	prop.load(MapperRefresh.class.getResourceAsStream(filename));
 } catch (Exception e) {
 	e.printStackTrace();
 	System.out.println("Load mybatis-refresh “"+filename+"” file error.");
 }

 enabled = "true".equalsIgnoreCase(getPropString("enabled"));
 
 delaySeconds = getPropInt("delaySeconds");
 sleepSeconds = getPropInt("sleepSeconds");
 mappingPath = getPropString("mappingPath");

 delaySeconds = delaySeconds == 0 ? 50 : delaySeconds;
 sleepSeconds = sleepSeconds == 0 ? 3 : sleepSeconds;
 mappingPath = StringUtils.isBlank(mappingPath) ? "mappings" : mappingPath;

 log.debug("[enabled] " + enabled);
 log.debug("[delaySeconds] " + delaySeconds);
 log.debug("[sleepSeconds] " + sleepSeconds);
 log.debug("[mappingPath] " + mappingPath);
```
}

public static boolean isRefresh() {
return refresh;
}

public MapperRefresh(Resource[] mapperLocations, Configuration configuration) {
this.mapperLocations = mapperLocations;
this.configuration = configuration;
}

@Override
public void run() {
```
 beforeTime = System.currentTimeMillis();

 log.debug("[location] " + location);
 log.debug("[configuration] " + configuration);

 if (enabled) {
 	// 启动刷新线程
 	final MapperRefresh runnable = this;
 	new Thread(new java.lang.Runnable() {
 		@Override
 		public void run() {
 			
 			if (location == null){
 				location = Sets.newHashSet();
 				log.debug("MapperLocation's length:" + mapperLocations.length);
 				for (Resource mapperLocation : mapperLocations) {
 					String s = mapperLocation.toString().replaceAll("\\\\", "/");
 					s = s.substring("file [".length(), s.lastIndexOf(mappingPath) + mappingPath.length());
 					if (!location.contains(s)) {
 						location.add(s);
 						log.debug("Location:" + s);
 					}
 				}
 				log.debug("Locarion's size:" + location.size());
 			}

 			try {
 				Thread.sleep(delaySeconds * 1000);
 			} catch (InterruptedException e2) {
 				e2.printStackTrace();
 			}
 			refresh = true;

 			System.out.println("========= Enabled refresh mybatis mapper =========");

 			while (true) {
 				try {
 					for (String s : location) {
 						runnable.refresh(s, beforeTime);
 					}
 				} catch (Exception e1) {
 					e1.printStackTrace();
 				}
 				try {
 					Thread.sleep(sleepSeconds * 1000);
 				} catch (InterruptedException e) {
 					e.printStackTrace();
 				}

 			}
 		}
 	}, "MyBatis-Mapper-Refresh").start();
 }
```
}

/**
- 执行刷新
- @param filePath 刷新目录
- @param beforeTime 上次刷新时间
- @throws NestedIOException 解析异常
- @throws FileNotFoundException 文件未找到
- @author ThinkGem
  */
  @SuppressWarnings({ “rawtypes”, “unchecked” })
  private void refresh(String filePath, Long beforeTime) throws Exception {
  
  // 本次刷新时间
  Long refrehTime = System.currentTimeMillis();
  
  // 获取需要刷新的Mapper文件列表
  List fileList = this.getRefreshFile(new File(filePath), beforeTime);
  if (fileList.size() > 0) {
  log.debug("Refresh file: " + fileList.size());
  }
  for (int i = 0; i < fileList.size(); i++) {
  InputStream inputStream = new FileInputStream(fileList.get(i));
  String resource = fileList.get(i).getAbsolutePath();
  try {
```
 	// 清理原有资源，更新为自己的StrictMap方便，增量重新加载
 	String[] mapFieldNames = new String[]{
 		"mappedStatements", "caches",
 		"resultMaps", "parameterMaps",
 		"keyGenerators", "sqlFragments"
 	};
 	for (String fieldName : mapFieldNames){
 		Field field = configuration.getClass().getDeclaredField(fieldName);
 		field.setAccessible(true);
 		Map map = ((Map)field.get(configuration));
 		if (!(map instanceof StrictMap)){
 			Map newMap = new StrictMap(StringUtils.capitalize(fieldName) + "collection");
 			for (Object key : map.keySet()){
 				try {
 					newMap.put(key, map.get(key));
 				}catch(IllegalArgumentException ex){
 					newMap.put(key, ex.getMessage());
 				}
 			}
 			field.set(configuration, newMap);
 		}
 	}
 	
 	// 清理已加载的资源标识，方便让它重新加载。
 	Field loadedResourcesField = configuration.getClass().getDeclaredField("loadedResources");
 	loadedResourcesField.setAccessible(true);
 	Set loadedResourcesSet = ((Set)loadedResourcesField.get(configuration));
 	loadedResourcesSet.remove(resource);
 	
 	//重新编译加载资源文件。
 	XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(inputStream, configuration, 
 			resource, configuration.getSqlFragments());
 	xmlMapperBuilder.parse();
 } catch (Exception e) {
 	throw new NestedIOException("Failed to parse mapping resource: '" + resource + "'", e);
 } finally {
 	ErrorContext.instance().reset();
 }
 System.out.println("Refresh file: " + mappingPath + StringUtils.substringAfterLast(fileList.get(i).getAbsolutePath(), mappingPath));
 if (log.isDebugEnabled()) {
 	log.debug("Refresh file: " + fileList.get(i).getAbsolutePath());
 	log.debug("Refresh filename: " + fileList.get(i).getName());
 }
```
  }
  // 如果刷新了文件，则修改刷新时间，否则不修改
  if (fileList.size() > 0) {
  this.beforeTime = refrehTime;
  }
  }
/**
- 获取需要刷新的文件列表
- @param dir 目录
- @param beforeTime 上次刷新时间
- @return 刷新文件列表
  */
  private List getRefreshFile(File dir, Long beforeTime) {
  List fileList = new ArrayList();
  
  File[] files = dir.listFiles();
  if (files != null) {
  for (int i = 0; i < files.length; i++) {
  File file = files[i];
  if (file.isDirectory()) {
  fileList.addAll(this.getRefreshFile(file, beforeTime));
  } else if (file.isFile()) {
  if (this.checkFile(file, beforeTime)) {
  fileList.add(file);
  }
  } else {
  System.out.println(“Error file.” + file.getName());
  }
  }
  }
  return fileList;
  }
/**
- 判断文件是否需要刷新
- @param file 文件
- @param beforeTime 上次刷新时间
- @return 需要刷新返回true，否则返回false
  */
  private boolean checkFile(File file, Long beforeTime) {
  if (file.lastModified() > beforeTime) {
  return true;
  }
  return false;
  }
/**
- 获取整数属性
- @param key
- @return
  */
  private static int getPropInt(String key) {
  int i = 0;
  try {
  i = Integer.parseInt(getPropString(key));
  } catch (Exception e) {
  }
  return i;
  }
/**
- 获取字符串属性
- @param key
- @return
  */
  private static String getPropString(String key) {
  return prop == null ? null : prop.getProperty(key);
  }
/**
- 重写 org.apache.ibatis.session.Configuration.StrictMap 类
- 来自 MyBatis3.4.0版本，修改 put 方法，允许反复 put更新。
  */
  public static class StrictMap extends HashMap {
  
  private static final long serialVersionUID = -4950446264854982944L;
  private String name;
  
  public StrictMap(String name, int initialCapacity, float loadFactor) {
  super(initialCapacity, loadFactor);
  this.name = name;
  }
  
  public StrictMap(String name, int initialCapacity) {
  super(initialCapacity);
  this.name = name;
  }
  
  public StrictMap(String name) {
  super();
  this.name = name;
  }
  
  public StrictMap(String name, Map m) {
  super(m);
  this.name = name;
  }
  
  @SuppressWarnings(“unchecked”)
  public V put(String key, V value) {
  // ThinkGem 如果现在状态为刷新，则刷新(先删除后添加)
  if (MapperRefresh.isRefresh()) {
  remove(key);
  MapperRefresh.log.debug(“refresh key:” + key.substring(key.lastIndexOf(".") + 1));
  }
  // ThinkGem end
  if (containsKey(key)) {
  throw new IllegalArgumentException(name + " already contains value for " + key);
  }
  if (key.contains(".")) {
  final String shortKey = getShortName(key);
  if (super.get(shortKey) == null) {
  super.put(shortKey, value);
  } else {
  super.put(shortKey, (V) new Ambiguity(shortKey));
  }
  }
  return super.put(key, value);
  }
  
  public V get(Object key) {
  V value = super.get(key);
  if (value == null) {
  throw new IllegalArgumentException(name + " does not contain value for " + key);
  }
  if (value instanceof Ambiguity) {
  throw new IllegalArgumentException(((Ambiguity) value).getSubject() + " is ambiguous in " + name
  + " (try using the full name including the namespace, or rename one of the entries)");
  }
  return value;
  }
  
  private String getShortName(String key) {
  final String[] keyparts = key.split("\.");
  return keyparts[keyparts.length - 1];
  }
  
  protected static class Ambiguity {
  private String subject;
```
 public Ambiguity(String subject) {
 	this.subject = subject;
 }

 public String getSubject() {
 	return subject;
 }
```
  }
  }
  }

MyBatis有几个不太好的地方，是当实体类别名重名的时候，Mapper XML有错误的时候，系统启动时会一直等待无法正常启动（其实是加载失败后又重新加载，进入了死循环），这里我也顺便重写下SqlSessionFactoryBean.java文件，解决这个问题，在这个文件里也加入启动上面写的线程类：

1、修改实体类重名的时候抛出并打印异常，否则系统会一直递归造成无法启动。

2、MapperXML有错误的时候抛出并打印异常，否则系统会一直递归造成无法启动。

3、加入启动MapperRefresh.java线程服务。

Java代码

/**
* Copyright 2010-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.thinkgem.jeesite.mybatis.spring;
import static org.springframework.util.Assert.notNull;
import static org.springframework.util.ObjectUtils.isEmpty;
import static org.springframework.util.StringUtils.hasLength;
import static org.springframework.util.StringUtils.tokenizeToStringArray;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.ibatis.builder.xml.XMLConfigBuilder;
import org.apache.ibatis.builder.xml.XMLMapperBuilder;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.type.TypeHandler;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.NestedIOException;
import org.springframework.core.io.Resource;
import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;
import com.thinkgem.jeesite.common.mybatis.thread.MapperRefresh;
/**
* {@code FactoryBean} that creates an MyBatis {@code SqlSessionFactory}.
* This is the usual way to set up a shared MyBatis {@code SqlSessionFactory} in a Spring application context;
* the SqlSessionFactory can then be passed to MyBatis-based DAOs via dependency injection.
*
* Either {@code DataSourceTransactionManager} or {@code JtaTransactionManager} can be used for transaction
* demarcation in combination with a {@code SqlSessionFactory}. JTA should be used for transactions
* which span multiple databases or when container managed transactions (CMT) are being used.
*
* @author Putthibong Boonbong
* @author Hunter Presnall
* @author Eduardo Macarron
*
* @see #setConfigLocation
* @see #setDataSource
* @version $Id$
* @modify ThinkGem 2016-5-24 来自 MyBatisSpring1.2.3版本
*/
public class SqlSessionFactoryBean implements FactoryBean, InitializingBean, ApplicationListener {
private static final Log LOGGER = LogFactory.getLog(SqlSessionFactoryBean.class);
private Resource configLocation;
private Resource[] mapperLocations;
private DataSource dataSource;
private TransactionFactory transactionFactory;
private Properties configurationProperties;
private SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
private SqlSessionFactory sqlSessionFactory;
//EnvironmentAware requires spring 3.1
private String environment = SqlSessionFactoryBean.class.getSimpleName();
private boolean failFast;
private Interceptor[] plugins;
private TypeHandler[] typeHandlers;
private String typeHandlersPackage;
private Class[] typeAliases;
private String typeAliasesPackage;
private Class typeAliasesSuperType;
//issue #19. No default provider.
private DatabaseIdProvider databaseIdProvider;
private ObjectFactory objectFactory;
private ObjectWrapperFactory objectWrapperFactory;
/**
* Sets the ObjectFactory.
*
* @since 1.1.2
* @param objectFactory
*/
public void setObjectFactory(ObjectFactory objectFactory) {
this.objectFactory = objectFactory;
}
/**
* Sets the ObjectWrapperFactory.
*
* @since 1.1.2
* @param objectWrapperFactory
*/
public void setObjectWrapperFactory(ObjectWrapperFactory objectWrapperFactory) {
this.objectWrapperFactory = objectWrapperFactory;
}
/**
* Gets the DatabaseIdProvider
*
* @since 1.1.0
* @return
*/
public DatabaseIdProvider getDatabaseIdProvider() {
return databaseIdProvider;
}
/**
* Sets the DatabaseIdProvider.
* As of version 1.2.2 this variable is not initialized by default.
*
* @since 1.1.0
* @param databaseIdProvider
*/
public void setDatabaseIdProvider(DatabaseIdProvider databaseIdProvider) {
this.databaseIdProvider = databaseIdProvider;
}
/**
* Mybatis plugin list.
*
* @since 1.0.1
*
* @param plugins list of plugins
*
*/
public void setPlugins(Interceptor[] plugins) {
this.plugins = plugins;
}
/**
* Packages to search for type aliases.
*
* @since 1.0.1
*
* @param typeAliasesPackage package to scan for domain objects
*
*/
public void setTypeAliasesPackage(String typeAliasesPackage) {
this.typeAliasesPackage = typeAliasesPackage;
}
/**
* Super class which domain objects have to extend to have a type alias created.
* No effect if there is no package to scan configured.
*
* @since 1.1.2
*
* @param typeAliasesSuperType super class for domain objects
*
*/
public void setTypeAliasesSuperType(Class typeAliasesSuperType) {
this.typeAliasesSuperType = typeAliasesSuperType;
}
/**
* Packages to search for type handlers.
*
* @since 1.0.1
*
* @param typeHandlersPackage package to scan for type handlers
*
*/
public void setTypeHandlersPackage(String typeHandlersPackage) {
this.typeHandlersPackage = typeHandlersPackage;
}
/**
* Set type handlers. They must be annotated with {@code MappedTypes} and optionally with {@code MappedJdbcTypes}
*
* @since 1.0.1
*
* @param typeHandlers Type handler list
*/
public void setTypeHandlers(TypeHandler[] typeHandlers) {
this.typeHandlers = typeHandlers;
}
/**
* List of type aliases to register. They can be annotated with {@code Alias}
*
* @since 1.0.1
*
* @param typeAliases Type aliases list
*/
public void setTypeAliases(Class[] typeAliases) {
this.typeAliases = typeAliases;
}
/**
* If true, a final check is done on Configuration to assure that all mapped
* statements are fully loaded and there is no one still pending to resolve
* includes. Defaults to false.
*
* @since 1.0.1
*
* @param failFast enable failFast
*/
public void setFailFast(boolean failFast) {
this.failFast = failFast;
}
/**
* Set the location of the MyBatis {@code SqlSessionFactory} config file. A typical value is
* "WEB-INF/mybatis-configuration.xml".
*/
public void setConfigLocation(Resource configLocation) {
this.configLocation = configLocation;
}
/**
* Set locations of MyBatis mapper files that are going to be merged into the {@code SqlSessionFactory}
* configuration at runtime.
*
* This is an alternative to specifying "<sqlmapper>" entries in an MyBatis config file.
* This property being based on Spring's resource abstraction also allows for specifying
* resource patterns here: e.g. "classpath*:sqlmap/*-mapper.xml".
*/
public void setMapperLocations(Resource[] mapperLocations) {
this.mapperLocations = mapperLocations;
}
/**
* Set optional properties to be passed into the SqlSession configuration, as alternative to a
* {@code <properties>} tag in the configuration xml file. This will be used to
* resolve placeholders in the config file.
*/
public void setConfigurationProperties(Properties sqlSessionFactoryProperties) {
this.configurationProperties = sqlSessionFactoryProperties;
}
/**
* Set the JDBC {@code DataSource} that this instance should manage transactions for. The {@code DataSource}
* should match the one used by the {@code SqlSessionFactory}: for example, you could specify the same
* JNDI DataSource for both.
*
* A transactional JDBC {@code Connection} for this {@code DataSource} will be provided to application code
* accessing this {@code DataSource} directly via {@code DataSourceUtils} or {@code DataSourceTransactionManager}.
*
* The {@code DataSource} specified here should be the target {@code DataSource} to manage transactions for, not
* a {@code TransactionAwareDataSourceProxy}. Only data access code may work with
* {@code TransactionAwareDataSourceProxy}, while the transaction manager needs to work on the
* underlying target {@code DataSource}. If there's nevertheless a {@code TransactionAwareDataSourceProxy}
* passed in, it will be unwrapped to extract its target {@code DataSource}.
*
*/
public void setDataSource(DataSource dataSource) {
if (dataSource instanceof TransactionAwareDataSourceProxy) {
// If we got a TransactionAwareDataSourceProxy, we need to perform
// transactions for its underlying target DataSource, else data
// access code won't see properly exposed transactions (i.e.
// transactions for the target DataSource).
this.dataSource = ((TransactionAwareDataSourceProxy) dataSource).getTargetDataSource();
} else {
this.dataSource = dataSource;
}
}
/**
* Sets the {@code SqlSessionFactoryBuilder} to use when creating the {@code SqlSessionFactory}.
*
* This is mainly meant for testing so that mock SqlSessionFactory classes can be injected. By
* default, {@code SqlSessionFactoryBuilder} creates {@code DefaultSqlSessionFactory} instances.
*
*/
public void setSqlSessionFactoryBuilder(SqlSessionFactoryBuilder sqlSessionFactoryBuilder) {
this.sqlSessionFactoryBuilder = sqlSessionFactoryBuilder;
}
/**
* Set the MyBatis TransactionFactory to use. Default is {@code SpringManagedTransactionFactory}
*
* The default {@code SpringManagedTransactionFactory} should be appropriate for all cases:
* be it Spring transaction management, EJB CMT or plain JTA. If there is no active transaction,
* SqlSession operations will execute SQL statements non-transactionally.
*
* It is strongly recommended to use the default {@code TransactionFactory}. If not used, any
* attempt at getting an SqlSession through Spring's MyBatis framework will throw an exception if
* a transaction is active.
*
* @see SpringManagedTransactionFactory
* @param transactionFactory the MyBatis TransactionFactory
*/
public void setTransactionFactory(TransactionFactory transactionFactory) {
this.transactionFactory = transactionFactory;
}
/**
* NOTE: This class overrides any {@code Environment} you have set in the MyBatis
* config file. This is used only as a placeholder name. The default value is
* {@code SqlSessionFactoryBean.class.getSimpleName()}.
*
* @param environment the environment name
*/
public void setEnvironment(String environment) {
this.environment = environment;
}
/**
* {@inheritDoc}
*/
@Override
public void afterPropertiesSet() throws Exception {
notNull(dataSource, "Property 'dataSource' is required");
notNull(sqlSessionFactoryBuilder, "Property 'sqlSessionFactoryBuilder' is required");
this.sqlSessionFactory = buildSqlSessionFactory();
}
/**
* Build a {@code SqlSessionFactory} instance.
*
* The default implementation uses the standard MyBatis {@code XMLConfigBuilder} API to build a
* {@code SqlSessionFactory} instance based on an Reader.
*
* @return SqlSessionFactory
* @throws IOException if loading the config file failed
*/
protected SqlSessionFactory buildSqlSessionFactory() throws IOException {
Configuration configuration;
XMLConfigBuilder xmlConfigBuilder = null;
if (this.configLocation != null) {
xmlConfigBuilder = new XMLConfigBuilder(this.configLocation.getInputStream(), null, this.configurationProperties);
configuration = xmlConfigBuilder.getConfiguration();
} else {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Property 'configLocation' not specified, using default MyBatis Configuration");
}
configuration = new Configuration();
configuration.setVariables(this.configurationProperties);
}
if (this.objectFactory != null) {
configuration.setObjectFactory(this.objectFactory);
}
if (this.objectWrapperFactory != null) {
configuration.setObjectWrapperFactory(this.objectWrapperFactory);
}
if (hasLength(this.typeAliasesPackage)) {
String[] typeAliasPackageArray = tokenizeToStringArray(this.typeAliasesPackage,
ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
for (String packageToScan : typeAliasPackageArray) {
// ThinkGem 修改实体类重名的时候抛出并打印异常，否则系统会一直递归造成无法启动
try {
configuration.getTypeAliasRegistry().registerAliases(packageToScan,
typeAliasesSuperType == null ? Object.class : typeAliasesSuperType);
} catch (Exception ex) {
LOGGER.error("Scanned package: '" + packageToScan + "' for aliases", ex);
throw new NestedIOException("Scanned package: '" + packageToScan + "' for aliases", ex);
} finally {
ErrorContext.instance().reset();
}
// ThinkGem end
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Scanned package: '" + packageToScan + "' for aliases");
}
}
}
if (!isEmpty(this.typeAliases)) {
for (Class typeAlias : this.typeAliases) {
configuration.getTypeAliasRegistry().registerAlias(typeAlias);
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Registered type alias: '" + typeAlias + "'");
}
}
}
if (!isEmpty(this.plugins)) {
for (Interceptor plugin : this.plugins) {
configuration.addInterceptor(plugin);
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Registered plugin: '" + plugin + "'");
}
}
}
if (hasLength(this.typeHandlersPackage)) {
String[] typeHandlersPackageArray = tokenizeToStringArray(this.typeHandlersPackage,
ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
for (String packageToScan : typeHandlersPackageArray) {
configuration.getTypeHandlerRegistry().register(packageToScan);
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Scanned package: '" + packageToScan + "' for type handlers");
}
}
}
if (!isEmpty(this.typeHandlers)) {
for (TypeHandler typeHandler : this.typeHandlers) {
configuration.getTypeHandlerRegistry().register(typeHandler);
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Registered type handler: '" + typeHandler + "'");
}
}
}
if (xmlConfigBuilder != null) {
try {
xmlConfigBuilder.parse();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Parsed configuration file: '" + this.configLocation + "'");
}
} catch (Exception ex) {
throw new NestedIOException("Failed to parse config resource: " + this.configLocation, ex);
} finally {
ErrorContext.instance().reset();
}
}
if (this.transactionFactory == null) {
this.transactionFactory = new SpringManagedTransactionFactory();
}
configuration.setEnvironment(new Environment(this.environment, this.transactionFactory, this.dataSource));
if (this.databaseIdProvider != null) {
try {
configuration.setDatabaseId(this.databaseIdProvider.getDatabaseId(this.dataSource));
} catch (SQLException e) {
throw new NestedIOException("Failed getting a databaseId", e);
}
}
if (!isEmpty(this.mapperLocations)) {
for (Resource mapperLocation : this.mapperLocations) {
if (mapperLocation == null) {
continue;
}
try {
XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(mapperLocation.getInputStream(),
configuration, mapperLocation.toString(), configuration.getSqlFragments());
xmlMapperBuilder.parse();
} catch (Exception e) {
// ThinkGem MapperXML有错误的时候抛出并打印异常，否则系统会一直递归造成无法启动
LOGGER.error("Failed to parse mapping resource: '" + mapperLocation + "'", e);
throw new NestedIOException("Failed to parse mapping resource: '" + mapperLocation + "'", e);
} finally {
ErrorContext.instance().reset();
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Parsed mapper file: '" + mapperLocation + "'");
}
}
// ThinkGem 启动刷新MapperXML定时器（有助于开发者调试）。
new MapperRefresh(this.mapperLocations, configuration).run();
} else {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Property 'mapperLocations' was not specified or no matching resources found");
}
}
return this.sqlSessionFactoryBuilder.build(configuration);
}
/**
* {@inheritDoc}
*/
@Override
public SqlSessionFactory getObject() throws Exception {
if (this.sqlSessionFactory == null) {
afterPropertiesSet();
}
return this.sqlSessionFactory;
}
/**
* {@inheritDoc}
*/
@Override
public Classextends SqlSessionFactory> getObjectType() {
return this.sqlSessionFactory == null ? SqlSessionFactory.class : this.sqlSessionFactory.getClass();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isSingleton() {
return true;
}
/**
* {@inheritDoc}
*/
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (failFast && event instanceof ContextRefreshedEvent) {
// fail-fast -> check all statements are completed
this.sqlSessionFactory.getConfiguration().getMappedStatementNames();
}
}
}

/**
 *    Copyright 2010-2015 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package com.thinkgem.jeesite.mybatis.spring;

import static org.springframework.util.Assert.notNull;
import static org.springframework.util.ObjectUtils.isEmpty;
import static org.springframework.util.StringUtils.hasLength;
import static org.springframework.util.StringUtils.tokenizeToStringArray;

import java.io.IOException;
import java.sql.SQLException;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.builder.xml.XMLConfigBuilder;
import org.apache.ibatis.builder.xml.XMLMapperBuilder;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.type.TypeHandler;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.NestedIOException;
import org.springframework.core.io.Resource;
import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;

import com.thinkgem.jeesite.common.mybatis.thread.MapperRefresh;

/**

{@code FactoryBean} that creates an MyBatis {@code SqlSessionFactory}.
This is the usual way to set up a shared MyBatis {@code SqlSessionFactory} in a Spring application context;
the SqlSessionFactory can then be passed to MyBatis-based DAOs via dependency injection.
Either {@code DataSourceTransactionManager} or {@code JtaTransactionManager} can be used for transaction
demarcation in combination with a {@code SqlSessionFactory}. JTA should be used for transactions
which span multiple databases or when container managed transactions (CMT) are being used.
@author Putthibong Boonbong
@author Hunter Presnall
@author Eduardo Macarron
@see #setConfigLocation
@see #setDataSource
@version $I d$
@modify ThinkGem 2016-5-24 来自 MyBatisSpring1.2.3版本
*/
public class SqlSessionFactoryBean implements FactoryBean, InitializingBean, ApplicationListener {

private static final Log LOGGER = LogFactory.getLog(SqlSessionFactoryBean.class);

private Resource configLocation;

private Resource[] mapperLocations;

private DataSource dataSource;

private TransactionFactory transactionFactory;

private Properties configurationProperties;

private SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();

private SqlSessionFactory sqlSessionFactory;

//EnvironmentAware requires spring 3.1
private String environment = SqlSessionFactoryBean.class.getSimpleName();

private boolean failFast;

private Interceptor[] plugins;

private TypeHandler[] typeHandlers;

private String typeHandlersPackage;

private Class[] typeAliases;

private String typeAliasesPackage;

private Class typeAliasesSuperType;

//issue #19. No default provider.
private DatabaseIdProvider databaseIdProvider;

private ObjectFactory objectFactory;

private ObjectWrapperFactory objectWrapperFactory;

/**

Sets the ObjectFactory.
@since 1.1.2
@param objectFactory
*/
public void setObjectFactory(ObjectFactory objectFactory) {
this.objectFactory = objectFactory;
}

/**

Sets the ObjectWrapperFactory.
@since 1.1.2
@param objectWrapperFactory
*/
public void setObjectWrapperFactory(ObjectWrapperFactory objectWrapperFactory) {
this.objectWrapperFactory = objectWrapperFactory;
}

/**

Gets the DatabaseIdProvider
@since 1.1.0
@return
*/
public DatabaseIdProvider getDatabaseIdProvider() {
return databaseIdProvider;
}

/**

Sets the DatabaseIdProvider.
As of version 1.2.2 this variable is not initialized by default.
@since 1.1.0
@param databaseIdProvider
*/
public void setDatabaseIdProvider(DatabaseIdProvider databaseIdProvider) {
this.databaseIdProvider = databaseIdProvider;
}

/**

Mybatis plugin list.
@since 1.0.1
@param plugins list of plugins

*/
public void setPlugins(Interceptor[] plugins) {
this.plugins = plugins;
}

/**

Packages to search for type aliases.
@since 1.0.1
@param typeAliasesPackage package to scan for domain objects

*/
public void setTypeAliasesPackage(String typeAliasesPackage) {
this.typeAliasesPackage = typeAliasesPackage;
}

/**

Super class which domain objects have to extend to have a type alias created.
No effect if there is no package to scan configured.
@since 1.1.2
@param typeAliasesSuperType super class for domain objects

*/
public void setTypeAliasesSuperType(Class typeAliasesSuperType) {
this.typeAliasesSuperType = typeAliasesSuperType;
}

/**

Packages to search for type handlers.
@since 1.0.1
@param typeHandlersPackage package to scan for type handlers

*/
public void setTypeHandlersPackage(String typeHandlersPackage) {
this.typeHandlersPackage = typeHandlersPackage;
}

/**

Set type handlers. They must be annotated with {@code MappedTypes} and optionally with {@code MappedJdbcTypes}
@since 1.0.1
@param typeHandlers Type handler list
*/
public void setTypeHandlers(TypeHandler[] typeHandlers) {
this.typeHandlers = typeHandlers;
}

/**

List of type aliases to register. They can be annotated with {@code Alias}
@since 1.0.1
@param typeAliases Type aliases list
*/
public void setTypeAliases(Class[] typeAliases) {
this.typeAliases = typeAliases;
}

/**

If true, a final check is done on Configuration to assure that all mapped
statements are fully loaded and there is no one still pending to resolve
includes. Defaults to false.
@since 1.0.1
@param failFast enable failFast
*/
public void setFailFast(boolean failFast) {
this.failFast = failFast;
}

/**

Set the location of the MyBatis {@code SqlSessionFactory} config file. A typical value is
“WEB-INF/mybatis-configuration.xml”.
*/
public void setConfigLocation(Resource configLocation) {
this.configLocation = configLocation;
}

/**

Set locations of MyBatis mapper files that are going to be merged into the {@code SqlSessionFactory}
configuration at runtime.
This is an alternative to specifying “<sqlmapper>” entries in an MyBatis config file.
This property being based on Spring’s resource abstraction also allows for specifying
resource patterns here: e.g. “classpath*:sqlmap/*-mapper.xml”.
*/
public void setMapperLocations(Resource[] mapperLocations) {
this.mapperLocations = mapperLocations;
}

/**

Set optional properties to be passed into the SqlSession configuration, as alternative to a
{@code <properties>} tag in the configuration xml file. This will be used to
resolve placeholders in the config file.
*/
public void setConfigurationProperties(Properties sqlSessionFactoryProperties) {
this.configurationProperties = sqlSessionFactoryProperties;
}

/**

Set the JDBC {@code DataSource} that this instance should manage transactions for. The {@code DataSource}
should match the one used by the {@code SqlSessionFactory}: for example, you could specify the same
JNDI DataSource for both.
A transactional JDBC {@code Connection} for this {@code DataSource} will be provided to application code
accessing this {@code DataSource} directly via {@code DataSourceUtils} or {@code DataSourceTransactionManager}.
The {@code DataSource} specified here should be the target {@code DataSource} to manage transactions for, not
a {@code TransactionAwareDataSourceProxy}. Only data access code may work with
{@code TransactionAwareDataSourceProxy}, while the transaction manager needs to work on the
underlying target {@code DataSource}. If there’s nevertheless a {@code TransactionAwareDataSourceProxy}
passed in, it will be unwrapped to extract its target {@code DataSource}.

*/
public void setDataSource(DataSource dataSource) {
if (dataSource instanceof TransactionAwareDataSourceProxy) {
// If we got a TransactionAwareDataSourceProxy, we need to perform
// transactions for its underlying target DataSource, else data
// access code won’t see properly exposed transactions (i.e.
// transactions for the target DataSource).
this.dataSource = ((TransactionAwareDataSourceProxy) dataSource).getTargetDataSource();
} else {
this.dataSource = dataSource;
}
}

/**

Sets the {@code SqlSessionFactoryBuilder} to use when creating the {@code SqlSessionFactory}.
This is mainly meant for testing so that mock SqlSessionFactory classes can be injected. By
default, {@code SqlSessionFactoryBuilder} creates {@code DefaultSqlSessionFactory} instances.

*/
public void setSqlSessionFactoryBuilder(SqlSessionFactoryBuilder sqlSessionFactoryBuilder) {
this.sqlSessionFactoryBuilder = sqlSessionFactoryBuilder;
}

/**

Set the MyBatis TransactionFactory to use. Default is {@code SpringManagedTransactionFactory}
The default {@code SpringManagedTransactionFactory} should be appropriate for all cases:
be it Spring transaction management, EJB CMT or plain JTA. If there is no active transaction,
SqlSession operations will execute SQL statements non-transactionally.
It is strongly recommended to use the default {@code TransactionFactory}. If not used, any
attempt at getting an SqlSession through Spring’s MyBatis framework will throw an exception if
a transaction is active.
@see SpringManagedTransactionFactory
@param transactionFactory the MyBatis TransactionFactory
*/
public void setTransactionFactory(TransactionFactory transactionFactory) {
this.transactionFactory = transactionFactory;
}

/**

NOTE: This class overrides any {@code Environment} you have set in the MyBatis
config file. This is used only as a placeholder name. The default value is
{@code SqlSessionFactoryBean.class.getSimpleName()}.
@param environment the environment name
*/
public void setEnvironment(String environment) {
this.environment = environment;
}

/**

{@inheritDoc}
*/
@Override
public void afterPropertiesSet() throws Exception {
notNull(dataSource, “Property ‘dataSource’ is required”);
notNull(sqlSessionFactoryBuilder, “Property ‘sqlSessionFactoryBuilder’ is required”);

this.sqlSessionFactory = buildSqlSessionFactory();

}

/**

Build a {@code SqlSessionFactory} instance.
The default implementation uses the standard MyBatis {@code XMLConfigBuilder} API to build a
{@code SqlSessionFactory} instance based on an Reader.
@return SqlSessionFactory
@throws IOException if loading the config file failed
*/
protected SqlSessionFactory buildSqlSessionFactory() throws IOException {

Configuration configuration;

XMLConfigBuilder xmlConfigBuilder = null;
if (this.configLocation != null) {
  xmlConfigBuilder = new XMLConfigBuilder(this.configLocation.getInputStream(), null, this.configurationProperties);
  configuration = xmlConfigBuilder.getConfiguration();
} else {
  if (LOGGER.isDebugEnabled()) {
    LOGGER.debug("Property 'configLocation' not specified, using default MyBatis Configuration");
  }
  configuration = new Configuration();
  configuration.setVariables(this.configurationProperties);
}

if (this.objectFactory != null) {
  configuration.setObjectFactory(this.objectFactory);
}

if (this.objectWrapperFactory != null) {
  configuration.setObjectWrapperFactory(this.objectWrapperFactory);
}

if (hasLength(this.typeAliasesPackage)) {
  String[] typeAliasPackageArray = tokenizeToStringArray(this.typeAliasesPackage,
      ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
  for (String packageToScan : typeAliasPackageArray) {
	// ThinkGem 修改实体类重名的时候抛出并打印异常，否则系统会一直递归造成无法启动
	try {
		configuration.getTypeAliasRegistry().registerAliases(packageToScan,
				typeAliasesSuperType == null ? Object.class : typeAliasesSuperType);
	} catch (Exception ex) {
		LOGGER.error("Scanned package: '" + packageToScan + "' for aliases", ex);
		throw new NestedIOException("Scanned package: '" + packageToScan + "' for aliases", ex);
	} finally {
		ErrorContext.instance().reset();
	}
	// ThinkGem end
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Scanned package: '" + packageToScan + "' for aliases");
    }
  }
}

if (!isEmpty(this.typeAliases)) {
  for (Class<?> typeAlias : this.typeAliases) {
    configuration.getTypeAliasRegistry().registerAlias(typeAlias);
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Registered type alias: '" + typeAlias + "'");
    }
  }
}

if (!isEmpty(this.plugins)) {
  for (Interceptor plugin : this.plugins) {
    configuration.addInterceptor(plugin);
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Registered plugin: '" + plugin + "'");
    }
  }
}

if (hasLength(this.typeHandlersPackage)) {
  String[] typeHandlersPackageArray = tokenizeToStringArray(this.typeHandlersPackage,
      ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
  for (String packageToScan : typeHandlersPackageArray) {
    configuration.getTypeHandlerRegistry().register(packageToScan);
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Scanned package: '" + packageToScan + "' for type handlers");
    }
  }
}

if (!isEmpty(this.typeHandlers)) {
  for (TypeHandler<?> typeHandler : this.typeHandlers) {
    configuration.getTypeHandlerRegistry().register(typeHandler);
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Registered type handler: '" + typeHandler + "'");
    }
  }
}

if (xmlConfigBuilder != null) {
  try {
    xmlConfigBuilder.parse();

    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Parsed configuration file: '" + this.configLocation + "'");
    }
  } catch (Exception ex) {
    throw new NestedIOException("Failed to parse config resource: " + this.configLocation, ex);
  } finally {
    ErrorContext.instance().reset();
  }
}

if (this.transactionFactory == null) {
  this.transactionFactory = new SpringManagedTransactionFactory();
}

configuration.setEnvironment(new Environment(this.environment, this.transactionFactory, this.dataSource));

if (this.databaseIdProvider != null) {
  try {
    configuration.setDatabaseId(this.databaseIdProvider.getDatabaseId(this.dataSource));
  } catch (SQLException e) {
    throw new NestedIOException("Failed getting a databaseId", e);
  }
}

if (!isEmpty(this.mapperLocations)) {
  for (Resource mapperLocation : this.mapperLocations) {
    if (mapperLocation == null) {
      continue;
    }

    try {
      XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(mapperLocation.getInputStream(),
          configuration, mapperLocation.toString(), configuration.getSqlFragments());
      xmlMapperBuilder.parse();
    } catch (Exception e) {
		// ThinkGem MapperXML有错误的时候抛出并打印异常，否则系统会一直递归造成无法启动
    	LOGGER.error("Failed to parse mapping resource: '" + mapperLocation + "'", e);
    	throw new NestedIOException("Failed to parse mapping resource: '" + mapperLocation + "'", e);
    } finally {
      ErrorContext.instance().reset();
    }

    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Parsed mapper file: '" + mapperLocation + "'");
    }
  }
  
  // ThinkGem 启动刷新MapperXML定时器（有助于开发者调试）。
  new MapperRefresh(this.mapperLocations, configuration).run();
  
} else {
  if (LOGGER.isDebugEnabled()) {
    LOGGER.debug("Property 'mapperLocations' was not specified or no matching resources found");
  }
}

return this.sqlSessionFactoryBuilder.build(configuration);

}

/**

{@inheritDoc}
*/
@Override
public SqlSessionFactory getObject() throws Exception {
if (this.sqlSessionFactory == null) {
afterPropertiesSet();
}

return this.sqlSessionFactory;

}

/**

{@inheritDoc}
*/
@Override
public Class getObjectType() {
return this.sqlSessionFactory == null ? SqlSessionFactory.class : this.sqlSessionFactory.getClass();
}

/**

{@inheritDoc}
*/
@Override
public boolean isSingleton() {
return true;
}

/**

{@inheritDoc}
*/
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (failFast && event instanceof ContextRefreshedEvent) {
// fail-fast -> check all statements are completed
this.sqlSessionFactory.getConfiguration().getMappedStatementNames();
}
}

}

重写SqlSessionFactoryBean就的修改下Spring的MyBatis配置部分：

Xml代码

<bean id="sqlSessionFactory" class="com.thinkgem.jeesite.common.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="com.thinkgem.jeesite"/>
<property name="typeAliasesSuperType" value="<span style="line-height: 1.5;">com.thinkgem.jeesitespan><span style="line-height: 1.5;">.persistence.BaseEntity"/>span>
<property name="mapperLocations" value="classpath*:/mappings/**/*.xml"/>
<property name="configLocation" value="classpath:/mybatis-config.xml">property>
bean>

最后附加上属性配置文件：mybatis-refresh.properties

Java代码

#是否开启刷新线程
enabled=true
#延迟启动刷新程序的秒数
delaySeconds=60
#刷新扫描间隔的时长秒数
sleepSeconds=3
#扫描Mapper文件的资源路径
mappingPath=mappings

#是否开启刷新线程
enabled=true
#延迟启动刷新程序的秒数
delaySeconds=60
#刷新扫描间隔的时长秒数
sleepSeconds=3
#扫描Mapper文件的资源路径
mappingPath=mappings

Java你会用，但这10点实战经验你一定不知道！

8大企业级实战项目提炼，总200+课时，限时助学2折特惠，立省4688元！

分享到：

JeeSite 4.0 规划（一） | Java如何正确地写出单例模式

2016-06-13 10:40
浏览 26246
评论(9)

  分类:企业架构      
  查看更多

9 楼 u010199866 2018-06-07

2018-06-07   15:42:44   [com.cjis.util.MapperRefresh]-[DEBUG]   [enabled] true
2018-06-07   15:42:44   [com.cjis.util.MapperRefresh]-[DEBUG]   [delaySeconds] 60
2018-06-07   15:42:44   [com.cjis.util.MapperRefresh]-[DEBUG]   [sleepSeconds] 3
2018-06-07   15:42:44   [com.cjis.util.MapperRefresh]-[DEBUG]   [mappingPath] com/cjis/mapping
2018-06-07   15:42:51   [com.cjis.util.MapperRefresh]-[DEBUG]   [location] null
2018-06-07   15:42:52   [com.cjis.util.MapperRefresh]-[DEBUG]   [configuration] org.apache.ibatis.session.Configuration@9367551
Exception in thread "MyBatis-Mapper-Refresh" java.lang.NoClassDefFoundError: com/google/common/collect/Sets
at com.cjis.util.MapperRefresh$1.run(MapperRefresh.java:101)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Sets
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
... 2 more

按照楼主的操作，报错呢请问这是为啥

8 楼 juxiaojun114 2018-03-04

jeesite 使用idea导入开发，启动tomcat后为啥看不到========= Enabled refresh mybatis mapper ========= 这个提示信息使用eclipse没有这个问题，是我的idea设置有问题吗？

7 楼 aaddsfdsfsdfs 2017-12-18

真心给个赞，可以的，忒提高开发效率了，配合自己写的通用后台框架，所有业务逻辑直接用js写的话，一次部署，后面基本都是热部署了，满意

6 楼 lovewinner 2017-04-17

5 楼空城旧梦已秋凉 2016-11-29

为何不了解一下nutz框架

4 楼 zhugeyangyang1994 2016-06-18

围观大神

3 楼 agen19866 2016-06-16

MyBatis SqlSessionFactoryBean

文件第5行一定要这样写么？

2 楼 8465279130 2016-06-15

赞!!!

1 楼 greatpwx 2016-06-13

发表评论

您还没有登录,请您登录后再发表评论

你可能感兴趣的:(Mybaties)

IDEA+Springboot+mybaties通过实体类自动建表 yuanyaunlv spring 基于springboot
1、引入pom依赖com.gitee.sunchenbin.mybatis.actablemybatis-enhance-actable1.0.3com.alibabadruid1.0.18org.apache.commonscommons-lang33.4net.sf.json-libjson-lib
springboot+mybaties返回类型为Map,null值不显示问题时之令
所有的积累都是遇见更强大的自己在使用mybaties的时候，如果我们的resultType配置的是java.util.Map的时候，如果（selecta,b,cfromdual）返回的结果集中，a的值时null的时候，在对应的Map集合中，没有对应的a的key，但是通常情况下，我们时需要这样的一个key（a），值为null，这样可以保证返回的结果集中数据结构的一致性。在与springboot集成后
Mybaties入门知识一个孤独者的仰望
D7)ASYQ))EIO5NYHVW8.png什么是Mybatis?是一个基于JAVA的持久层框架为什么要使用mybatis？mybatis是ORM的一种实现框架，都是对JDBC的封装！在使用JDBC的时候，我们发现开发太麻烦了，什么么都要我们干Hibernate用起来就比较舒服，不用写SQL语句但是不能处理复杂的业务逻辑。但是mybatis既能够处理复杂的业务逻辑。又能在一定程度上解放开发人员的
2. 代码层次解读配置文件解析进击的水瓶
上次案例中实现了简单的mybaties的demo案例运行,1.mybaties简单案例搭建写了一个Demo简单体现了一下Mybatis的流程。本次，将简单介绍一下Mybatis的配置文件：上次例子中，我们以SqlSessionFactoryBuilder去创建SqlSessionFactory,那么，我们就先从SqlSessionFactoryBuilder入手，咱们先看看源码是怎么实现的：1.S
SpringBoot整合mybaties 有活就干
一、mysql环境准备1、创建数据库yx，创建用户表userCREATETABLE`user`(`id`int(11)NOTNULLAUTO_INCREMENT,`username`varchar(255)CHARACTERSETutf8mb4COLLATEutf8mb4_unicode_ciNOTNULL,`password`varchar(255)CHARACTERSETutf8mb4COLL
MyBaties-增删查改 ccb_ SSM mybatis
文章目录一、简单的增删查改1.添加2.删除3.修改4.查询一、简单的增删查改1.添加insertintouservalues(null,"cc","123445",20);2.删除deletefromuserwhereid=3;3.修改updateusersetusername='aa'whereid=4;4.查询查询功能的标签必须设置resultType或resultMapresultType:
搭建SpringBoot+Mybaties0配置织雾呀
依赖：org.mybatismybatis-spring1.3.2org.springframework.bootspring-boot-starter-jdbc2.1.2.RELEASEorg.mybatis.spring.bootmybatis-spring-boot-starter1.3.2mysqlmysql-connector-java8.0.15这里需要注意的是对应的数据库版本一定要和
MyBatis 入门指南：基本配置和使用杜小白也想的美 mybatis
ORM——对象关系映射O:对应的是java中的对象，一般是pojo（实体类）R:关系型数据库M:映射,指java中对象映射到数据库表中对应的记录，或者是数据库表中对应记录映射成java中的对象一个mybaties程序1、添加依赖org.springframework.bootspring-boot-starter-parent2.7.10mysqlmysql-connector-java5.1.4
JAVA课程设计--类京东购物车设计夜间飛行课程设计 java vue.js javascript
目录小组成员负责模块：程序介绍：1.前期调查：1.1京东购物车页面首页购物车界面商品信息界面搜索界面1.2程序设计页面首页购物车页面商品信息界面搜索界面：2.使用环境：3.技术支持前端VUE后端Springboot4.项目结构图5：功能需求分析6.演示：7.项目亮点1.vue框架使用2.Element插件使用：3.mybaties使用4.mysql数据库使用5.搜索功能：6.springboot框
常用命令语句之SQL篇爱吃糖的靓仔 #功能代码 sql java
文章目录SQL1.分组取最值2.时间戳格式化3.库的磁盘占用4.表的磁盘占用5.流量转化Mybaties1.条件判断2.循环4.模糊查询SQL1.分组取最值select*from(select*fromt_userhaving1ORDERBYcreateddesc)aGROUPBYspbh2.时间戳格式化SELECTFROM_UNIXTIME(auto.update_time/1000,'%Y-%
Oracle通过mybaties批量插入二营长1 oracle 数据库 java
需要通过一个sql批量往oracle里插入数据。错误写法：insertinto表名(字段1,字段2,字段3,字段4,字段5,字段6)values(#{item.a},#{item.b},#{item.c},#{item.d},#{item.e},#{item.f})正确写法：INSERTALLinto表名(字段1,字段2,字段3,字段4,字段5,字段6)values(#{item.a,jdbcTy
MyBaties相关配置文件代码 82瓜 java 开发语言
注意两个配置文件直接放在resources包下，文件名称想改也可以，注意后面的配置要同步mybatis-config.xml-->-->logback.xml[%level]%cyan([%thread])%boldGreen(%logger{15})-%msg%n可以包含零个或多个元素，标识这个输出位置将会被本日志级别控制。-->注意1.SQL映射文件和对应Mapper接口命名必须相同2.将Ma
MyBaties根据generatorConfig配置文件生成映射文件芥末鱿鱼~ MyBaties mybatis generatorConfig 逆向工程
MyBaties根据generatorConfig配置文件生成映射文件MyBatis是一个基于Java语言的持久层框架，它通过XML描述符或注解将对象与存储过程或SQL语句进行映射，并提供了普通SQL查询、存储过程和高级映射等操作方式，使得操作数据库变得非常方便。如果需要使用MyBatisGenerator来自动生成Java代码和MyBatis映射文件，则可以通过一下步骤来实现添加POM插件依赖o
基于Java+SpringBoot+Mybaties-plus+Vue+ElementUI+Vant 电影院订票管理系统的设计与实现 qq_28917403 java精品案例分享 spring boot vue.js 后端
一.项目介绍基于SpringBoot+Vue电影院订票管理系统分为前端和后端。前端（用户）：登录后支持查看首页、电影、影院和我的信息支持查看正在热映和即将上映的电影信息支持购票（需选择影院座位）、看过（评论）、想看（收藏）的功能支持编辑个人资料，查看我的订单以及想看和看过的记录后端（管理员）：登录后统计用户、影院、影片、订单以及性别比例和电影类型维护用户管理、电影管理、影院管理、影厅管理、电影排片
Spring Boot ： ORM 框架 JPA 与连接池 Hikari 微服务技术分享 spring boot 后端 java
数据库方面我们选用Mysql，SpringBoot提供了直接使用JDBC的方式连接数据库，毕竟使用JDBC并不是很方便，需要我们自己写更多的代码才能使用，一般而言在SpringBoot中我们常用的ORM框架有JPA和Mybaties，本篇文章我们要介绍的就是JPA的使用姿势。说道使用ORM框架，就不得不顺便聊一下连接池，市面上很多成熟的数据库连接池，如C3P0、Tomcat连接池、BoneCP等等
【微服务实战系列】 GateWay从Mysql中加载动态路由代码实现 dream21st 微服务实战系列 mysql 微服务 gateway
上一部分，我们通过代码实现了，可以在nacos中配置路由文件，动态刷新网关中的路由。这一部分，我们来将gateway的路由规则保存到数据库，实现规则文件从数据库中读取和加载。动态修改数据库中的路由可以及时生效。接着，在micro-app-gateway项目中的pom.xml文件中添加如下依赖（数据库连接和mybaties-plus）：com.zaxxerHikariCP
mybatis--基础--3.2--xml映射文件--select元素勤径苦舟 mybatis mybatis xml
mybatis–基础–3.2–xml映射文件–select元素代码地址https://gitee.com/DanShenGuiZu/learnDemo/tree/mysql_mybaties_DB/mybatis-learn-master1、select元素1.1、案例SELECT*FROMPERSONWHEREID=#{id}这个语句被称作selectPerson，接受一个int(或Intege
mybatis--基础--3.3--xml映射文件--insert，update，delete元素勤径苦舟 mybatis mybatis xml
mybatis–基础–3.3–xml映射文件–insert，update，delete元素代码地址https://gitee.com/DanShenGuiZu/learnDemo/tree/mysql_mybaties_DB/mybatis-learn-master1、insert，update，delete元素2、属性id:sql语句的唯一标识符parameterType参数类型，使用全类名或者
SpringBoot-整合jdbctemplate 月弦YueXian Spring spring boot java spring
前言JdbcTemplate简介JdbcTemplate是Spring框架自带的对JDBC操作的封装，目的是提供统一的模板方法使对数据库的操作更加方便、友好，效率也不错。但是功能还是不够强大（比如不支持级联属性），在实际应用中还需要和hibernate、mybaties等框架混合使用。优点：运行期：高效、内嵌Spring框架中、支持基于AOP的声明式事务。缺点：必须于Spring框架结合在一起使用
mybaties的小技巧 Flying_Fish_roe java mybatis tomcat
配置MyBatis在application.yml文件中添加MyBatis配置信息mybatis:#实体类所在包名type-aliases-package:com.example.demo.entity#mapper映射文件所在目录mapper-locations:classpath:mapper/*.xml配置Mapper扫描器在SpringBootApplication类上添加@MapperS
springboot+vue练手小项目[前台搭建+后台编写]（非常详细） m0_67402564 面试阿里巴巴 vue.js spring boot java mysql android-studio
[springboot+vue练手小项目]技术栈：springboot+vue3+element-plus+Mybaties-plus+hutool+mysql8项目介绍：最近刚学了springboot+vue，就想着做一个小的前后端分离的练手项目，简单的后台管理页面，有基本的登陆注册+增删改查，后面具体的模块等需要的时候的再进行完善，这只是一个练手项目，如果大家运行不出来或者有疑问，欢迎交流。我
封装Java类使得处理mybaties方法变得简单大志哥123 java 开发语言
封装的效果：Java项目中可以直接使用类中的方法调用mapper.xml中对应namaspace、sqlid的SQL语句。不需要在Java中再申明接口等。importjava.util.HashMap;importjava.util.List;importjava.util.Map;importorg.apache.ibatis.session.SqlSession;publicclassMyba
基于Java+SpringBoot+Mybaties-plus+Vue+ElementUI 失物招领小程序设计与实现 qq_28917403 小程序案例分享（java +Vue）java精品案例分享 java spring boot vue.js
一.项目介绍失物招领小程序用户登录、忘记密码、退出系统发布失物和发布招领查看我发布的失物和招领信息失捡物品模块可以查看和搜索所有用户发布的信息。二.环境需要1.运行环境：javajdk1.82.ide环境：IDEA、Eclipse、Myeclipse都可以，推荐用IDEA3.硬件环境：windows7/8/10/111G内存以上；或者MacOS。4.数据库：mysql8.0都可三.技术栈1.后端：
java解析xml文件 yigg Java java
JDKAPI中提供了3种方式解析XML，分别为DOM、SAX、XPath。目录：DOMXPath：Mybaties中采用XPath方式解析XML文件的配置信息。SAX：Spring使用SAX读取xml文件使用第三方JDOM仅适用具体类而不使用接口API大量使用了Collections类dom4j：Javadom4j生成和解析XML_ouyangjun__的博客-CSDN博客_dom4j解析xml步
若依spring-cloud 集成mybaties-plus java进击者 java mybaties-plus springcloud java springcloud mybatis
1.在项目根pom文件中添加依赖com.baomidoumybatis-plus-boot-starter${mybatis-plus.version}2.在模块ruoyi-common-core里的pom文件中添加依赖com.baomidoumybatis-plus-boot-starter3.nacos配置文件application-dev.yml中添加如下配置,并且去掉ruoyi-syste
MyBaties存储和查询json格式的数据(实体存储查询版本) 渣渣洒泪成长记 json
最近在做的功能，由于别的数据库有值，需要这边的不同入口的进来查询，所以需要同步过来，如果再继续一个一个生成列对应处理感觉不方便，如果没有别的操作，只是存储和查询，那就可以用MySql支持的json格式存储了。MySql的json是5.7之后才可以处理的，所以版本一定要是这个或者比这个高呦！首先第一步我们需要定义个处理json类型类，可以叫BaseAttributeTypeHandler，来继承Ba
IntelliJ IDEA 2020.2.1白票安装使用方法技术很渣 intellij-idea java ide
先安装好idearPlugins内手动添加第三方插件仓库地址：https://plugins.zhile.io搜索：IDEEvalReset插件进行安装输入https://plugins.zhile.io手动安装离线插件方法安装包可以去笔者的CSDN资源库下载安装mybaties插件
mybaties分页实现静谧的美 mysql
select*from表limit(pageNo-1)*pageSize,pageSize
【MyBatis进阶】mybatis-config.xml分析以及try-catch新用法南斋孤鹤 SSM框架 oracle 数据库
目录尝试在mybatis项目中书写增删改查遇见问题：使用mybaties向数据库中插入数据，idea显示插入成功，但是数据库中并没有数据变化?MyBatis核心配置文件剖析细节剖析：try-catch新用法截至目前我的项目存在的问题，Mapper.xml文件中的SQL语句任然是死的，这里还有一个问题就是。假如表结构的列名和你设计的pojo中的列名虽然能够对应上但是名字不一样，比如大小写或者多个符号
springboot+mybaties扫描不到@mapper注解-依赖引入错误不知道方向只知道前行 spring boot mybatis
报错如下图所示：Acomponentrequiredabeanoftype'com.XXXX.CommonMapper'thatcouldnotbefound网上的方法，都是在mapper接口加@mapper注解或者再启动类加@MapperScan注解我检查了，都照做了还是没有解决问题。再看一下依赖。原来是依赖引入错误。这是一个不应该犯的错误，很多教程第一步就是让你引入mybatis-spring
xml解析小猪猪08 xml
1、DOM解析的步奏准备工作： 1.创建DocumentBuilderFactory的对象 2.创建DocumentBuilder对象 3.通过DocumentBuilder对象的parse(String fileName)方法解析xml文件 4.通过Document的getElem
每个开发人员都需要了解的一个SQL技巧 brotherlamp linux linux视频 linux教程 linux自学 linux资料
对于数据过滤而言CHECK约束已经算是相当不错了。然而它仍存在一些缺陷，比如说它们是应用到表上面的，但有的时候你可能希望指定一条约束，而它只在特定条件下才生效。使用SQL标准的WITH CHECK OPTION子句就能完成这点，至少Oracle和SQL Server都实现了这个功能。下面是实现方式： CREATE TABLE books ( id &
Quartz——CronTrigger触发器 eksliang quartz CronTrigger
转载请出自出处：http://eksliang.iteye.com/blog/2208295 一.概述 CronTrigger 能够提供比 SimpleTrigger 更有具体实际意义的调度方案，调度规则基于 Cron 表达式，CronTrigger 支持日历相关的重复时间间隔（比如每月第一个周一执行），而不是简单的周期时间间隔。二.Cron表达式介绍 1）Cron表达式规则表 Quartz
Informatica基础 18289753290 Informatica Monitor manager workflow Designer
1. 1）PowerCenter Designer：设计开发环境，定义源及目标数据结构；设计转换规则，生成ETL映射。 2）Workflow Manager：合理地实现复杂的ETL工作流，基于时间，事件的作业调度 3）Workflow Monitor：监控Workflow和Session运行情况，生成日志和报告 4）Repository Manager：
linux下为程序创建启动和关闭的的sh文件，scrapyd为例酷的飞上天空 scrapy
对于一些未提供service管理的程序每次启动和关闭都要加上全部路径，想到可以做一个简单的启动和关闭控制的文件下面以scrapy启动server为例，文件名为run.sh： #端口号，根据此端口号确定PID PORT=6800 #启动命令所在目录 HOME='/home/jmscra/scrapy/' #查询出监听了PORT端口
人--自私与无私永夜-极光
今天上毛概课,老师提出一个问题--人是自私的还是无私的,根源是什么? 从客观的角度来看,人有自私的行为,也有无私的
Ubuntu安装NS-3 环境脚本随便小屋 ubuntu
将附件下载下来之后解压，将解压后的文件ns3environment.sh复制到下载目录下（其实放在哪里都可以，就是为了和我下面的命令相统一）。输入命令： sudo ./ns3environment.sh >>result 这样系统就自动安装ns3的环境，运行的结果在result文件中，如果提示 com
创业的简单感受 aijuans 创业的简单感受
2009年11月9日我进入a公司实习，2012年4月26日，我离开a公司，开始自己的创业之旅。今天是2012年5月30日，我忽然很想谈谈自己创业一个月的感受。当初离开边锋时，我就对自己说：“自己选择的路，就是跪着也要把他走完”，我也做好了心理准备，准备迎接一次次的困难。我这次走出来，不管成败
如何经营自己的独立人脉 aoyouzi 如何经营自己的独立人脉
独立人脉不是父母、亲戚的人脉，而是自己主动投入构造的人脉圈。“放长线，钓大鱼”，先行投入才能产生后续产出。现在几乎做所有的事情都需要人脉。以银行柜员为例，需要拉储户，而其本质就是社会人脉，就是社交！很多人都说，人脉我不行，因为我爸不行、我妈不行、我姨不行、我舅不行……我谁谁谁都不行，怎么能建立人脉？我这里说的人脉，是你的独立人脉。以一个普通的银行柜员
JSP基础百合不是茶 jsp 注释隐式对象
1,JSP语句的声明 <%! 声明 %> 　　声明：这个就是提供java代码声明变量、方法等的场所。表达式 <%= 表达式 %> 　　这个相当于赋值，可以在页面上显示表达式的结果，程序代码段/小型指令　<% 程序代码片段 %> 2,JSP的注释
web.xml之session-config、mime-mapping bijian1013 java web.xml servlet session-config mime-mapping
session-config 1.定义： <session-config> <session-timeout>20</session-timeout> </session-config> 2.作用：用于定义整个WEB站点session的有效期限，单位是分钟。 mime-mapping 1.定义： <mime-m
互联网开放平台（1） Bill_chen 互联网 qq 新浪微博百度腾讯
现在各互联网公司都推出了自己的开放平台供用户创造自己的应用，互联网的开放技术欣欣向荣，自己总结如下： 1.淘宝开放平台(TOP) 网址：http://open.taobao.com/ 依赖淘宝强大的电子商务数据，将淘宝内部业务数据作为API开放出去，同时将外部ISV的应用引入进来。目前TOP的三条主线： TOP访问网站：open.taobao.com ISV后台：my.open.ta
【MongoDB学习笔记九】MongoDB索引 bit1129 mongodb
索引可以在任意列上建立索引索引的构造和使用与传统关系型数据库几乎一样,适用于Oracle的索引优化技巧也适用于Mongodb 使用索引可以加快查询,但同时会降低修改,插入等的性能内嵌文档照样可以建立使用索引测试数据 var p1 = { "name":"Jack", "age&q
JDBC常用API之外的总结白糖_ jdbc
做JAVA的人玩JDBC肯定已经很熟练了，像DriverManager、Connection、ResultSet、Statement这些基本类大家肯定很常用啦，我不赘述那些诸如注册JDBC驱动、创建连接、获取数据集的API了，在这我介绍一些写框架时常用的API，大家共同学习吧。 ResultSetMetaData获取ResultSet对象的元数据信息
apache VelocityEngine使用记录 bozch VelocityEngine
VelocityEngine是一个模板引擎，能够基于模板生成指定的文件代码。使用方法如下： VelocityEngine engine = new VelocityEngine();// 定义模板引擎 Properties properties = new Properties();// 模板引擎属
编程之美-快速找出故障机器 bylijinnan 编程之美
package beautyOfCoding; import java.util.Arrays; public class TheLostID { /*编程之美假设一个机器仅存储一个标号为ID的记录，假设机器总量在10亿以下且ID是小于10亿的整数，假设每份数据保存两个备份，这样就有两个机器存储了同样的数据。 1.假设在某个时间得到一个数据文件ID的列表，是
关于Java中redirect与forward的区别 chenbowen00 java servlet
在Servlet中两种实现： forward方式：request.getRequestDispatcher(“/somePage.jsp”).forward(request, response); redirect方式：response.sendRedirect(“/somePage.jsp”); forward是服务器内部重定向，程序收到请求后重新定向到另一个程序，客户机并不知
[信号与系统]人体最关键的两个信号节点 comsci 系统
如果把人体看做是一个带生物磁场的导体,那么这个导体有两个很重要的节点,第一个在头部,中医的名称叫做百汇穴, 另外一个节点在腰部,中医的名称叫做命门如果要保护自己的脑部磁场不受到外界有害信号的攻击,最简单的
oracle 存储过程执行权限 daizj oracle 存储过程权限执行者调用者
在数据库系统中存储过程是必不可少的利器，存储过程是预先编译好的为实现一个复杂功能的一段Sql语句集合。它的优点我就不多说了，说一下我碰到的问题吧。我在项目开发的过程中需要用存储过程来实现一个功能，其中涉及到判断一张表是否已经建立，没有建立就由存储过程来建立这张表。 CREATE OR REPLACE PROCEDURE TestProc IS fla
为mysql数据库建立索引 dengkane mysql 性能索引
前些时候，一位颇高级的程序员居然问我什么叫做索引，令我感到十分的惊奇，我想这绝不会是沧海一粟，因为有成千上万的开发者（可能大部分是使用MySQL的）都没有受过有关数据库的正规培训，尽管他们都为客户做过一些开发，但却对如何为数据库建立适当的索引所知较少，因此我起了写一篇相关文章的念头。最普通的情况，是为出现在where子句的字段建一个索引。为方便讲述，我们先建立一个如下的表。
学习C语言常见误区如何看懂一个程序如何掌握一个程序以及几个小题目示例 dcj3sjt126com c 算法
如果看懂一个程序，分三步 1、流程 2、每个语句的功能 3、试数如何学习一些小算法的程序尝试自己去编程解决它，大部分人都自己无法解决如果解决不了就看答案关键是把答案看懂，这个是要花很大的精力，也是我们学习的重点看懂之后尝试自己去修改程序，并且知道修改之后程序的不同输出结果的含义照着答案去敲调试错误
centos6.3安装php5.4报错 dcj3sjt126com centos6
报错内容如下: Resolving Dependencies --> Running transaction check ---> Package php54w.x86_64 0:5.4.38-1.w6 will be installed --> Processing Dependency: php54w-common(x86-64) = 5.4.38-1.w6 for
JSONP请求 flyer0126 jsonp
使用jsonp不能发起POST请求。 It is not possible to make a JSONP POST request. JSONP works by creating a <script> tag that executes Javascript from a different domain; it is not pos
Spring Security（03）——核心类简介 234390216 Authentication
核心类简介目录 1.1 Authentication 1.2 SecurityContextHolder 1.3 AuthenticationManager和AuthenticationProvider 1.3.1 &nb
在CentOS上部署JAVA服务 java--hhf java jdk centos Java服务
本文将介绍如何在CentOS上运行Java Web服务，其中将包括如何搭建JAVA运行环境、如何开启端口号、如何使得服务在命令执行窗口关闭后依旧运行第一步：卸载旧Linux自带的JDK ①查看本机JDK版本 java -version 结果如下 java version "1.6.0"
oracle、sqlserver、mysql常用函数对比[to_char、to_number、to_date] ldzyz007 oracle mysql SQL Server
oracle &n
记Protocol Oriented Programming in Swift of WWDC 2015 ningandjin protocol WWDC 2015 Swift2.0
其实最先朋友让我就这个题目写篇文章的时候，我是拒绝的，因为觉得苹果就是在炒冷饭，把已经流行了数十年的OOP中的“面向接口编程”还拿来讲，看完整个Session之后呢，虽然还是觉得在炒冷饭，但是毕竟还是加了蛋的，有些东西还是值得说说的。通常谈到面向接口编程，其主要作用是把系统设计和具体实现分离开，让系统的每个部分都可以在不影响别的部分的情况下，改变自身的具体实现。接口的设计就反映了系统
搭建 CentOS 6 服务器(15) - Keepalived、HAProxy、LVS rensanning keepalived
（一）Keepalived （1）安装 # cd /usr/local/src # wget http://www.keepalived.org/software/keepalived-1.2.15.tar.gz # tar zxvf keepalived-1.2.15.tar.gz # cd keepalived-1.2.15 # ./configure # make &a
ORACLE数据库SCN和时间的互相转换 tomcat_oracle oracle sql
SCN（System Change Number 简称 SCN）是当Oracle数据库更新后，由DBMS自动维护去累积递增的一个数字，可以理解成ORACLE数据库的时间戳，从ORACLE 10G开始，提供了函数可以实现SCN和时间进行相互转换；　　用途：在进行数据库的还原和利用数据库的闪回功能时，进行SCN和时间的转换就变的非常必要了；　　操作方法：　　1、通过dbms_f
Spring MVC 方法注解拦截器 xp9802 spring mvc
应用场景，在方法级别对本次调用进行鉴权，如api接口中有个用户唯一标示accessToken,对于有accessToken的每次请求可以在方法加一个拦截器，获得本次请求的用户，存放到request或者session域。 python中，之前在python flask中可以使用装饰器来对方法进行预处理，进行权限处理先看一个实例,使用@access_required拦截： ?

实现MyBatis Mapper XML文件增量动态刷新，自动加载，热加载，热部署