(Sping Xml方式整合第三方框架)学习Spring的第十天

Spring整合mybatis

1 . 导入Mybatis整合Spring的相关坐标

 <dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.13.RELEASE</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.5</version>

2 . 编写Mapper和文件

在此给出 Mapper.xml文件如下

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.mapper.UserMapper"><select id="findAll" resultType="com.itheima.pojo.User">select id,username,password from tb_user</select>
</mapper>

 3 . 在Applicationcontext.xml文件进行配置

  <!--        配置数据源信息--><bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" ><property name="driverClassName" value="com.mysql.jdbc.Driver"></property><property name="url" value="jdbc:mysql://localhost:3306/mybatis"></property><property name="username" value="root"></property><property name="password" value="y2123802992"></property></bean><!--配置SqlSessionFactoryBean，作用将SqlSessionFactory存储到spring容器--><bean class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource"></property></bean><!--MapperScannerConfigurer,作用扫描指定的包，产生Mapper对象存储到Spring容器--><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="com.itheima.mapper"></property></bean><bean id="userService" class="com.itheima.service.impl.UserServiceImpl"><!--                <constructor-arg name="name" value="haha"></constructor-arg> 构            造Bean的参数都可以这样设置--><property name="userMapper" ref="userMapper"></property></bean>

注意userMapper对象自动创建 , 由MapperScannerConfigurer扫描后,自动产生对象存储到Spring容器 , 所以无需配置 , 在userService标签里property属性直接设置即可

还需在userServiceiml里注入mapper

private UserMapper userMapper;public void setUserMapper(UserMapper userMapper) {this.userMapper = userMapper;}

4 . 最后在测试文件测试即可

 UserService bean = applicationContext.getBean(UserService.class);

注意: SqlSessionFactory是mybatis中的一个类 , 数据库实例 , 可以进行增删改查