spring+mybatis

1.导入依赖

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>2.0.2</version>
</dependency>

2.编写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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

<!--配置数据源：数据源有非常多，可以使用第三方的，也可使使用Spring的-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8"/>
    <property name="username" value="root"/>
    <property name="password" value="123456"/>
</bean>

    <!--配置SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <!--关联Mybatis-->
    <property name="configLocation" value="classpath:mybatis-config.xml"/>
    <property name="mapperLocations" value="classpath:com/kuang/dao/*.xml"/>
</bean>
<!--注册sqlSessionTemplate , 关联sqlSessionFactory-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
    <!--利用构造器注入-->
    <constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
<bean id="userDao" class="com.kuang.dao.UserDaoImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>

3.编写mybatis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>

    <!-- settings -->
    <settings>
        <!-- 打开延迟加载的开关 -->
        <setting name="lazyLoadingEnabled" value="true"/>
        <!-- 将积极加载改为消极加载（即按需加载） -->
        <setting name="aggressiveLazyLoading" value="false"/>
        <!-- 打开全局缓存开关（二级缓存）默认值就是 true -->
        <setting name="cacheEnabled" value="true"/>
　　　　　　<!-- Java实体类属性：首字母小写的驼峰式命名 -->
 　　　　<setting name="mapUnderscoreToCamelCase" value="true"/>

    </settings>

    <!-- 别名定义 -->
    <typeAliases>
        <package name="cn.wmyskxz.pojo"/>
    </typeAliases>


</configuration>

4.编写mapper接口

6.编写mapper映射文件

7.注册bean 添加Dao

public class UserDaoImpl implements UserMapper {
    //sqlSession不用我们自己创建了，Spring来管理
    private SqlSessionTemplate sqlSession;
    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }
    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.selectUser();
    }
}

8.测试

    @Test
    public void test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserMapper mapper = (UserMapper) context.getBean("userDao");
        List<User> user = mapper.selectUser();
        System.out.println(user);
    }

    <!-- 加载映射文件 -->
    <mappers>
        <!-- 通过 resource 方法一次加载一个映射文件 -->
        <mapper resource="sqlmap/UserMapper.xml"/>
        <!-- 批量加载mapper -->
        <package name="cn.wmyskxz.mapper"/>
    </mappers>