Spring 整合 myBatis

思路

1. 数据库连接池交给 Spring 管理
2. SqlSessionFactory 交给 Spring 管理
3. 从 Spring 容器中直接获得 mapper 的代理对象

步骤

1. 创建工程
2. 导入 jar
3. 创建 config 文件夹，放置配置文件
   • 配置文件：
     • jdbc.properties : 数据库配置

       jdbc.driverClass=com.mysql.cj.jdbc.Driver
       jdbc.url=jdbc:mysql://localhost:3306/jdbc?serverTimezone=UTC
       jdbc.username=root
       jdbc.password=root
       

     • log4j.properties ：日志打印
     • mybatis_config.xml：myBatis 配置,只需要配置二级缓存就可以了，其他都交给 Spring 处理。

       <?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>    <!-- 开启二级缓存 -->   
           <settings>       
               <setting name="cacheEnabled" value="true" />   
           </settings>
       </configuration>
       

     • applicationContext.xml：Spring 配置文件

       <?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:aop="http://www.springframework.org/schema/aop"   
           xmlns:tx="http://www.springframework.org/schema/tx"   
           xmlns:context="http://www.springframework.org/schema/context"
               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.xsd                           
               http://www.springframework.org/schema/aop                           
               http://www.springframework.org/schema/aop/spring-aop.xsd                           
               http://www.springframework.org/schema/tx                           
               http://www.springframework.org/schema/tx/spring-tx.xsd">   
           <!-- 加载配置文件 -->   
           <context:property-placeholder location="classpath:config/jdbc.properties" />   
           <!-- 数据库连接池 -->   
           <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">       
               <property name="driverClassName"
               value="${jdbc.driverClass}" />       
               <property name="url" value="${jdbc.url}" />       
               <property name="username" value="${jdbc.username}" />       
               <property name="password" value="${jdbc.password}" />       
               <property name="maxActive" value="10" />       
               <property name="maxIdle" value="5" />   
           </bean>   
           <!-- 配置 sqlSessionFactory -->   
           <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">       
               <!-- 配置 mybatis 核心配置文件 -->       
               <property name="configLocation" value="classpath:config/mybatis_config.xml" />       
               <!-- 配置数据源 -->       
               <property name="dataSource" ref="dataSource" />       
           </bean>   
       </beans>
       

4. DAO 开发

   1. 创建 POJO User.java

      public class User {   
          private Integer id;   
          private String username;   
          private Date birthday;   
          private String address;   
          private boolean sex;   
          public boolean isSex() {       
          return sex;   
          }   
          public void setSex(boolean sex) {      
           this.sex = sex;   
          }   
          public Integer getId() {       
           return id;   
          }   
          public void setId(Integer id) {      
            this.id = id;  
          }   
          public String getUsername() {       
           return username;  
          }   
          public void setUsername(String username) {      
           this.username = username;   
          }   
          public Date getBirthday() {     
           return birthday;  
          }   
          public void setBirthday(Date birthday) {     
           this.birthday = birthday;   
          }   
          public String getAddress() {    
            return address;   
          }   
          public void setAddress(String address) {      
           this.address = address;  
          }   
          @Override   
          public String toString() {       
           return "User{" +                "id=" + id +                ", username='" + username + '\'' +                ", birthday=" + birthday +                ", address='" + address + '\'' +                ", sex=" + sex +                '}';   
          }
      }
      

   2. 在 applicatonContext.xml 中配置别名扫描
      
      

   3. 实现 UserMapper 接口

      public interface UserMapper {   
          User quertUserById(int id);   
      
          List<User> queryUserByUserName(String username);   
      
          void saveUser(User user);
      }
      

   4. 实现 UserMapper.xml 配置文件

      <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC
      "-//mybatis.org//DTD Mapper 3.0//EN"    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
      <mapper namespace="cc.lijingbo.ssm.mapper.UserMapper">   
          <select id="quertUserById" parameterType="int" resultType="user">       
              select * from user where id = #{id}   
          </select>   
          <select id="queryUserByUserName" resultType="user" parameterType="String">       
              select * from user where username like '%${value}%'   
          </select>   
          <insert id="saveUser" parameterType="user">       
              <selectKey keyProperty="id" keyColumn="id" order="AFTER"   resultType="int">           
              select last_insert_id()       
              </selectKey>       
              insert into user (username,sex,address) values (#{username},#{sex},#{address})   
          </insert>
      </mapper>
      

   5. 在 applicationContext.xml 中配置 mapper 扫描
      
      

   6. 测试

      public class UserMapperTest {   
          ApplicationContext applicationContext;   
          @Before   
          public void setUp() throws Exception {       
              applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
          }   
          @Test   
          public void quertUserById() {       
              UserMapper userMapper =
              applicationContext.getBean(UserMapper.class);       
              User user = userMapper.quertUserById(3);       
              System.out.println(user);   
          }   
          @Test   
          public void queryUserByUserName() {       
              UserMapper userMapper = applicationContext.getBean(UserMapper.class);       
              List<User> users = userMapper.queryUserByUserName("张");       
              for (User u : users) {          
                  System.out.println(u);      
              }   
          }   
          @Test   
          public void saveUser() {       
              UserMapper userMapper = applicationContext.getBean(UserMapper.class);       
              User user = new User();       
              user.setUsername("刘备");      
              user.setAddress("深圳XXX");      
              user.setSex(false);      
              userMapper.saveUser(user); 
          }
      }
      

源码 github 地址