本文介绍spring+mybatis配置,数据库使用mysql,mybatis代码使用mybatis-generator生成
1、创建maven项目,加入spring、mybatis、mysql、proxool依赖,并加入mybatis-generator插件,pom.xml如下
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.qerooy</groupId>
<artifactId>spring-mybatis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<spring.version>4.0.2.RELEASE</spring.version>
<mybatis.version>3.2.2</mybatis.version>
<mybatis-spring.version>1.2.0</mybatis-spring.version>
<log4j.version>1.2.17</log4j.version>
<mysql.version>5.1.29</mysql.version>
<proxool.version>0.9.1</proxool.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis-spring.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>proxool</groupId>
<artifactId>proxool</artifactId>
<version>${proxool.version}</version>
</dependency>
<dependency>
<groupId>com.cloudhopper.proxool</groupId>
<artifactId>proxool-cglib</artifactId>
<version>${proxool.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>3.2.3.RELEASE</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
</plugin>
</plugins>
</build>
</project>
2、创建数据库qerooy,并创建一个user表;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(30) NOT NULL,
`password` varchar(50) NOT NULL,
`remark` varchar(50) DEFAULT NULL,
`create_time` datetime NOT NULL,
`update_time` datetime NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `username` (`username`)
) ENGINE=InnoDB AUTO_INCREMENT=93 DEFAULT CHARSET=utf8;
3、编写mybatis-generator代码生成插件配置文件generatorConfig.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<classPathEntry location="D:\.m2\repository\mysql\mysql-connector-java\5.1.29\mysql-connector-java-5.1.29.jar" />
<context id="Mysql2Tables" targetRuntime="MyBatis3">
<plugin type="org.mybatis.generator.plugins.RowBoundsPlugin">
</plugin>
<commentGenerator>
<property name="suppressAllComments" value="false" />
<property name="suppressDate" value="true" />
</commentGenerator>
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/qerooy"
userId="root"
password="123jkl">
</jdbcConnection>
<javaTypeResolver >
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<javaModelGenerator targetPackage="com.qerooy.model" targetProject="src/main/java">
<property name="enableSubPackages" value="false" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<sqlMapGenerator targetPackage="map" targetProject="src/main/resources/">
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER" targetPackage="com.qerooy.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<table schema="root" tableName="user" domainObjectName="User" >
<generatedKey column="id" sqlStatement="MYSQL" identity="true" />
</table>
</context>
</generatorConfiguration>
执行命令 mvn -Dmybatis.generator.overwrite=true mybatis-generator:generate生成mybatis代码
4、编写mybatis分页插件
package com.qerooy.base.dialect;
public class Dialect {
public boolean supportsLimit() {
return false;
}
public boolean supportsLimitOffset() {
return supportsLimit();
}
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset), limit, Integer.toString(limit));
}
public String getLimitString(String sql, int offset, String offsetPlaceholder, int limit, String limitPlaceholder) {
throw new UnsupportedOperationException("paged queries not supported");
}
}
package com.qerooy.base.dialect;
public class Dialect {
public boolean supportsLimit() {
return false;
}
public boolean supportsLimitOffset() {
return supportsLimit();
}
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset), limit, Integer.toString(limit));
}
public String getLimitString(String sql, int offset, String offsetPlaceholder, int limit, String limitPlaceholder) {
throw new UnsupportedOperationException("paged queries not supported");
}
}
package com.qerooy.base.dialect;
public class Dialect {
public boolean supportsLimit() {
return false;
}
public boolean supportsLimitOffset() {
return supportsLimit();
}
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset), limit, Integer.toString(limit));
}
public String getLimitString(String sql, int offset, String offsetPlaceholder, int limit, String limitPlaceholder) {
throw new UnsupportedOperationException("paged queries not supported");
}
}
5、编写spring配置文件applicationContext.xml、jdbc.properties
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<context:component-scan base-package="*" />
<util:properties id="dataSourceProps" location="classpath:jdbc.properties" />
<bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource">
<property name="driver" value="#{dataSourceProps['jdbc.driverClassName']}" />
<property name="driverUrl" value="#{dataSourceProps['jdbc.url']}" />
<property name="user" value="#{dataSourceProps['jdbc.username']}" />
<property name="password" value="#{dataSourceProps['jdbc.password']}" />
</bean>
<!-- 配置Mybatis -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mapperLocations" value="classpath:map/*.xml" />
<property name="plugins">
<list>
<ref bean="pagingPlugin" />
</list>
</property>
</bean>
<bean id="pagingPlugin" class="com.qerooy.base.plugin.PagingPlugin">
<property name="dialectClass">
<value>#{dataSourceProps['jdbc.dialect']}</value>
</property>
</bean>
<bean name="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.qerooy.mapper" />
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
</beans>
jdbc.username=root
jdbc.password=123jkl
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/qerooy?useUnicode=true&characterEncoding=UTF-8
jdbc.dialect=com.qerooy.base.dialect.MySQLDialect
jdbc.initialPoolSize=10
jdbc.minPoolSize=2
jdbc.maxPoolSize=5
jdbc.maxIdleTime=60
jdbc.acquireIncrement=5
jdbc.idleConnectionTestPeriod=60
jdbc.acquireRetryAttempts=20
jdbc.breakAfterAcquireFailure=true
jdbc.maxStatements=0
jdbc.testConnectionOnCheckout=false
6、编写Service操作数据库类及测试代码
package com.qerooy.service;
import java.util.List;
import org.apache.ibatis.session.RowBounds;
import com.qerooy.model.User;
import com.qerooy.model.UserExample;
public interface UserService {
public User findById(Integer id);
public List<User> findByPage(UserExample example,RowBounds rowBounds);
}
package com.qerooy.service.impl;
import java.util.List;
import org.apache.ibatis.session.RowBounds;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.qerooy.mapper.UserMapper;
import com.qerooy.model.User;
import com.qerooy.model.UserExample;
import com.qerooy.service.UserService;
@Service
public class UserServiceImpl implements UserService {
@Autowired
UserMapper userMapper;
@Override
public User findById(Integer id) {
return userMapper.selectByPrimaryKey(id);
}
@Override
public List<User> findByPage(UserExample example,RowBounds rowBounds){
return userMapper.selectByExampleWithRowbounds(example,rowBounds);
}
}
package com.qerooy;
import java.util.List;
import org.apache.ibatis.session.RowBounds;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.qerooy.model.User;
import com.qerooy.model.UserExample;
import com.qerooy.service.UserService;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath*:applicationContext*.xml"})
public class MybatisTest {
@Autowired
UserService userService;
@Test
public void findById() {
User user = userService.findById(3);
System.out.println(user);
}
@Test
public void findByPage() {
UserExample example = new UserExample();
RowBounds rowBounds = new RowBounds(1,10);
List<User> list = userService.findByPage(example,rowBounds);
System.out.println(list);
}
}
为方便查看sql语句,可配置以下log4j.properties
log4j.rootCategory=INFO, CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[%p] %c %m%n
log4j.logger.com.qerooy.mapper = DEBUG