二十一、SpringBoot整合Mybatis、通用mapper和pageHelp

MyBatis通用Mapper3的介绍

通用Mapper都可以极大的方便开发人员。可以随意的按照自己的需要选择通用方法，还可以很方便的开发自己的通用方法。

极其方便的使用MyBatis单表的增删改查。

支持单表操作，不支持通用的多表联合查询。

不客气的说,使用这个通用Mapper甚至能改变你对Mybatis单表基础操作不方便的想法,使用它你能简单的使用单表的增删改查,包含动态的增删改查.

程序使用拦截器实现具体的执行Sql,完全使用原生的Mybatis进行操作.

你还在因为数据库表变动重新生成xml吗?还是要手动修改自动生成的insert|update|delete的xml呢?赶紧使用通用Mapper,表的变动只需要实体类保持一致,不用管基础的xml,你不止会拥有更多的时间陪老婆|孩子|女朋友|打DOTA,你也不用做哪些繁琐无聊的事情,感兴趣了吗?继续看如何使用吧!!相信这个通用的Mapper会让你更方便的使用Mybatis,这是一个强大的Mapper!!!

不管你信不信,这个项目的测试代码中没有一个Mapper的xml配置文件,但是却可以做到每个Mapper对应上百行xml才能完成的许多功能.没有了这些基础xml信息的干扰,你将会拥有清晰干净的Mapper.xml.

发现BUG可以提Issue,可以给我发邮件,可以加我QQ,可以进Mybatis群讨论.

详细介绍看https://github.com/abel533/Mapper；
作者的博客：http://blog.csdn.net/isea533/article/details/41457529

pageHelp的介绍

同样附上作者的博客地址：http://blog.csdn.net/isea533/article/details/23831273

Springboot整合

maven依赖

"><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>4.0.0modelVersion>

    <groupId>com.lfgroupId>
    <artifactId>mybatis-mapperartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <packaging>jarpackaging>

    <name>mybatis-mappername>
    <description>Demo project for Spring Bootdescription>

    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>1.5.2.RELEASEversion>
        <relativePath/> 
    parent>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>1.3.0version>
        dependency>

        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>

        
        <dependency>
            <groupId>tk.mybatisgroupId>
            <artifactId>mapper-spring-boot-starterartifactId>
            <version>1.1.0version>
        dependency>
        
        <dependency>
            <groupId>com.github.pagehelpergroupId>
            <artifactId>pagehelper-spring-boot-starterartifactId>
            <version>1.1.0version>
        dependency>

        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>1.0.25version>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>javax.servlet-apiartifactId>
            <version>3.0.1version>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>
project>

工程的目录结构

配置application文件

# 驱动配置信息
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8  
spring.datasource.username = root
spring.datasource.password = adminter
spring.datasource.driverClassName = com.mysql.jdbc.Driver

#连接池的配置信息
## 初始化大小，最小，最大
spring.druid.initialSize=5
spring.druid.minIdle=5
spring.druid.maxActive=20
## 配置获取连接等待超时的时间
spring.druid.maxWait=60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.druid.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.druid.minEvictableIdleTimeMillis=300000
spring.druid.validationQuery=SELECT 1 FROM DUAL
spring.druid.testWhileIdle=true
spring.druid.testOnBorrow=false
spring.druid.testOnReturn=false
spring.druid.poolPreparedStatements=true
spring.druid.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.druid.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
##
spring.profiles.active=dev


#mybatis
mybatis.type-aliases-package=com.lf.entity
mybatis.mapper-locations=classpath:mapper/*.xml #mappers 多个接口时逗号隔开 #mapper.mappers=tk.mybatis.mapper.common.Mapper mapper.mappers=com.lf.util.MyMapper mapper.not-empty=false mapper.identity=MYSQL #pagehelper pagehelper.helperDialect=mysql pagehelper.reasonable=true pagehelper.supportMethodsArguments=true pagehelper.params=count=countSql

配置druid连接池 DruidSource.java文件

package com.lf.datasource;

import com.alibaba.druid.pool.DruidDataSource;
import com.github.pagehelper.PageHelper;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Properties;

/** * Created by LF on 2017/4/18. */
@ConfigurationProperties(prefix = "spring.druid")
public class DruidSource {

    private String dbUrl;

    private String username;

    private String password;

    private String driverClassName;

    private int initialSize;

    private int minIdle;

    private int maxActive;

    private int maxWait;

    private int timeBetweenEvictionRunsMillis;

    private int minEvictableIdleTimeMillis;
    private String validationQuery;

    private boolean testWhileIdle;
    private boolean testOnBorrow;

    private boolean testOnReturn;

    private boolean poolPreparedStatements;

    private int maxPoolPreparedStatementPerConnectionSize;

    private String filters;

    private String connectionProperties;

    public String getDbUrl() {
        return dbUrl;
    }

    public void setDbUrl(String dbUrl) {
        this.dbUrl = dbUrl;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public int getInitialSize() {
        return initialSize;
    }

    public void setInitialSize(int initialSize) {
        this.initialSize = initialSize;
    }

    public int getMinIdle() {
        return minIdle;
    }

    public void setMinIdle(int minIdle) {
        this.minIdle = minIdle;
    }

    public int getMaxActive() {
        return maxActive;
    }

    public void setMaxActive(int maxActive) {
        this.maxActive = maxActive;
    }

    public int getMaxWait() {
        return maxWait;
    }

    public void setMaxWait(int maxWait) {
        this.maxWait = maxWait;
    }

    public int getTimeBetweenEvictionRunsMillis() {
        return timeBetweenEvictionRunsMillis;
    }

    public void setTimeBetweenEvictionRunsMillis(int timeBetweenEvictionRunsMillis) {
        this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
    }

    public int getMinEvictableIdleTimeMillis() {
        return minEvictableIdleTimeMillis;
    }

    public void setMinEvictableIdleTimeMillis(int minEvictableIdleTimeMillis) {
        this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
    }

    public String getValidationQuery() {
        return validationQuery;
    }

    public void setValidationQuery(String validationQuery) {
        this.validationQuery = validationQuery;
    }

    public boolean isTestWhileIdle() {
        return testWhileIdle;
    }

    public void setTestWhileIdle(boolean testWhileIdle) {
        this.testWhileIdle = testWhileIdle;
    }

    public boolean isTestOnBorrow() {
        return testOnBorrow;
    }

    public void setTestOnBorrow(boolean testOnBorrow) {
        this.testOnBorrow = testOnBorrow;
    }

    public boolean isTestOnReturn() {
        return testOnReturn;
    }

    public void setTestOnReturn(boolean testOnReturn) {
        this.testOnReturn = testOnReturn;
    }

    public boolean isPoolPreparedStatements() {
        return poolPreparedStatements;
    }

    public void setPoolPreparedStatements(boolean poolPreparedStatements) {
        this.poolPreparedStatements = poolPreparedStatements;
    }

    public int getMaxPoolPreparedStatementPerConnectionSize() {
        return maxPoolPreparedStatementPerConnectionSize;
    }

    public void setMaxPoolPreparedStatementPerConnectionSize(int maxPoolPreparedStatementPerConnectionSize) {
        this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
    }

    public String getFilters() {
        return filters;
    }

    public void setFilters(String filters) {
        this.filters = filters;
    }

    public String getConnectionProperties() {
        return connectionProperties;
    }

    public void setConnectionProperties(String connectionProperties) {
        this.connectionProperties = connectionProperties;
    }

    @Bean     //声明其为Bean实例
    @Primary  //在同样的DataSource中，首先使用被标注的DataSource
    public DataSource dataSource()  {
        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);

        //configuration
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setPoolPreparedStatements(poolPreparedStatements);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);

        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {
            e.printStackTrace();
        }


        return datasource;
    }


    @Bean
    @Primary
    //配置事物管理
    public DataSourceTransactionManager masterTransactionManager() throws SQLException {
        return new DataSourceTransactionManager(dataSource());
    }

}

DruidConfig.java文件，连接池的监控配置

package com.lf.config;

import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/** * Created by LF on 2017/4/18. */
@Configuration
public class DruidConfig {

    @Bean
    public ServletRegistrationBean servletRegistration() {
        ServletRegistrationBean servletRegistration = new ServletRegistrationBean(new StatViewServlet());        //添加初始化参数：initParams
        servletRegistration.addUrlMappings("/druid/*");
        //白名单
        servletRegistration.addInitParameter("allow", "127.0.0.1");
        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
        servletRegistration.addInitParameter("deny", "192.168.1.73");
        //登录查看信息的账号密码.
        servletRegistration.addInitParameter("loginUsername", "admin");
        servletRegistration.addInitParameter("loginPassword", "123456");
        //是否能够重置数据.
        servletRegistration.addInitParameter("resetEnable", "false");
        return servletRegistration;
    }

    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //添加过滤规则.
        filterRegistrationBean.addUrlPatterns("/*");
        //添加不需要忽略的格式信息.
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
}

CityMapper.java

package com.lf.mapper;

import com.lf.entity.City;
import com.lf.util.MyMapper;

/** * Created by LF on 2017/4/19. */
public interface CityMapper extends MyMapper<City> {
}

City实体类

package com.lf.entity;

import javax.persistence.Id;
import javax.persistence.Table;

/** * Created by LF on 2017/4/18. */
@Table(name = "city")
public class City {
    @Id
    private String id;
    private String name;
    private String state;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }
}

service及其实现

CityService

package com.lf.service;

import com.lf.entity.City;

import java.util.List;

/** * Created by LF on 2017/4/18. */

public interface CityService {
    List getAll();
}

package com.lf.service.impl;

import com.github.pagehelper.PageHelper;
import com.lf.mapper.CityMapper;
import com.lf.entity.City;
import com.lf.service.CityService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/** * Created by LF on 2017/4/19. */
@Service
public class CityServiceImpl implements CityService {

    @Autowired
    private CityMapper cityDao;

    @Override
    public List getAll() {
        PageHelper.startPage(1,1);
        return cityDao.selectAll();
    }
}

MyMapper

package com.lf.util;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

/**继承自己的MyMapper * Created by LF on 2017/4/19. */
public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {
}

启动类一定不能扫描到MyMapper文件

package com.lf;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan(basePackages = "com.lf.mapper")
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

测试类

package com.lf;

import com.lf.service.CityService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = Application.class)
public class ApplicationTests {

    @Autowired
    private CityService cityMapper;

    @Test
    public void contextLoads() {
        cityMapper.getAll();
    }

}