MyBatisPlus-2-集成

入门案例

1.1 创建测试表

CREATE DATABASE mp;
USE mp;
CREATE TABLE tbl_employee(
   id INT(11) PRIMARY KEY AUTO_INCREMENT,
   last_name VARCHAR(50),
   email VARCHAR(50),
   gender CHAR(1),
   age INT
);
INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Tom','tom@test.com',1,22);
INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Jerry','jerry@test.com',0,25);
INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Black','black@test.com',1,30);
INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('White','white@test.com',0,35);

1.2 创建Javabean

@Data
@TableName(value = "tbl_employee")
public class Employee {

    @TableId(value = "id", type = IdType.AUTO)
    private Integer id;

    @TableField(value = "last_name")
    private String lastName;

    private String email;

    private Integer gender;

    private Integer age;

    @TableField(exist = false)
    private Double salary;
}

1.3 依赖配置
1.3.1 pom添加
在 pom.xml 中加入对 MP、Spring、连接池、Junit、Mysql 驱动、lombok等依赖
特别说明: Mybatis 及 Mybatis-Spring 依赖请勿加入项目配置，以免引起版本冲突！！！ Mybatis-Plus 会自动帮你维护

1.3.2 添加mybatis全局配置文件

1.3.3 添加log4j.xml

1.3.4 加入db.properties连接信息配置

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mp
jdbc.username=root
jdbc.password=123456

1.3.5 加入spring的配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

    <!-- 数据源 -->
    <context:property-placeholder location="classpath:db.properties"/>
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!-- 事务管理器 -->
    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 基于注解的事务管理 -->
    <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>

    <!--  配置SqlSessionFactoryBean
        Mybatis提供的: org.mybatis.spring.SqlSessionFactoryBean
        MP提供的:com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean
     -->
    <bean id="sqlSessionFactoryBean" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 别名处理 -->
        <property name="typeAliasesPackage" value="com.atguigu.mp.beans"/>

        <!-- 注入全局MP策略配置 -->
        <property name="globalConfig" ref="globalConfiguration"/>
    </bean>

    <!-- 定义MybatisPlus的全局策略配置-->
    <bean id="globalConfiguration" class="com.baomidou.mybatisplus.entity.GlobalConfiguration">
        <!-- 在2.3版本以后，dbColumnUnderline 默认值就是true -->
        <property name="dbColumnUnderline" value="true"/>
        <!-- 全局的主键策略 -->
        <property name="idType" value="0"/>
        <!-- 全局的表前缀策略配置 -->
        <property name="tablePrefix" value="tbl_"/>
    </bean>

    <!-- 配置mybatis 扫描mapper接口的路径 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.don.mp.mapper"/>
    </bean>

</beans>

1.4 测试
测试 Spring-Mybatis 的环境

public class TestMP01 {

    private ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");

    @Test
    public void testDataSource() throws Exception {
        DataSource ds = ioc.getBean("dataSource", DataSource.class);
        System.out.println(ds);
        Connection conn = ds.getConnection();
        System.out.println(conn);
    }

}

1.5 集成MP
Mybatis-Plus 的集成非常简单，对于 Spring，我们仅仅需要把 Mybatis 自带的 MybatisSqlSessionFactoryBean 替换为 MP 自带的即可

配置SqlSessionFactoryBean
    Mybatis提供的: org.mybatis.spring.SqlSessionFactoryBean
    MP提供的:com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean

来源：https://my.oschina.net/u/4186635/blog/3101765