第 2 章 集成 MP

2.1 创建测试表

-- 创建库
CREATE DATABASE mp;
-- 使用库
USE mp;
-- 创建表
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','[email protected]',1,22);
INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Jerry','[email protected]',0,25);
INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Black','[email protected]',1,30);
INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('White','[email protected]',0,35);

2.2 创建 javaBean

public class Employee {
    
private Integer id ; 
private String lastName; 
private String email ;
private Integer gender ;
 private Integer age ;
public Integer getId() {
    
return id; }
public void setId(Integer id) {
    
this.id = id; }
public String getLastName() {
    
return lastName;
}
public void setLastName(String lastName) {
    
this.lastName = lastName; }
public String getEmail() {
    
return email; }
public void setEmail(String email) {
    
this.email = email; }
public Integer getGender() {
    
return gender; }
public void setGender(Integer gender) {
    
this.gender = gender; }
 public Integer getAge() {
    
return age; }
public void setAge(Integer age) {
    
this.age = age; }
@Override
public String toString() {
    
return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email
+ ", gender=" + gender + ", age="
+ age + "]"; }

2.3 依赖配置

1. 在 pom.xml 中加入对 MP、Spring、连接池、Junit、Mysql 驱动等依赖

<!-- mp 依赖 -->
<dependency>
 <groupId>com.baomidou</groupId>
 <artifactId>mybatis-plus</artifactId>
 <version>2.3</version>
</dependency>
<!--junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
</dependency>
<!-- log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
<!-- spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.10.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.3.10.RELEASE</version>
</dependency>

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！

2. 加入 MyBatis 的全局配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
 </configuration>

3. 加入 log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
 <param name="Encoding" value="UTF-8" />
 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m (%F:%L) \n" />
 </layout>
</appender>
<logger name="java.sql">
 <level value="debug" />
</logger>
<logger name="org.apache.ibatis">
 <level value="info" />
</logger>
<root>
 <level value="debug" />
 <appender-ref ref="STDOUT" />
</root>
</log4j:configuration>

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=1234

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"
xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
xsi:schemaLocation="http://mybatis.org/schema/mybatis-spring 
http://mybatis.org/schema/mybatis-spring-1.2.xsd
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="${jdbc.driver}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!-- 事务管理器 -->
<bean id="dataSourceTransactionManager" 
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 基于注解的事务管理 -->
<tx:annotation-driven 
transaction-manager="dataSourceTransactionManager"/>
<!-- 配置 SqlSessionFactoryBean -->
<bean id="sqlSessionFactoryBean" 
class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据源 -->
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation"
value="classpath:mybatis-config.xml"></property>
<!-- 别名处理 -->
<property name="typeAliasesPackage" 
value="com.atguigu.mp.beans"></property>
</bean>
<!--
配置 mybatis 扫描 mapper 接口的路径
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" 
value="com.atguigu.mp.mapper"></property>
</bean>
</beans>

2.4 测试

1. 测试 Spring-Mybatis 的环境，保证 OK

private ApplicationContext iocContext = new 
ClassPathXmlApplicationContext("applicationContext.xml");
@Test
public void testEnvironment() throws Exception{
    
DataSource ds = iocContext.getBean("dataSource",DataSource.class);
Connection conn = ds.getConnection();
System.out.println(conn);
}

2.6 集成 MP

1. 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。

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