Mybatis整合Spring(传统dao开发)

一.导包

　　1.Mybatis的核心包以及依赖包

　　2.Spring的jar包（这个可能麻烦点）

　　3.mybastis和spring整合包

　　4.数据库驱动包

　　5.根据自己需求，junit,jstl等jar包导入，下面也将springmvc所需的jar也导入了

二.设计表，创建表

三.创建mybatis和spring的主配置文件

　　1.书写mybatis配置。由于数据库连接的参数交给spring保管，只配别名和引入映射文件就够了

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

<configuration>
    <typeAliases>
        <package name="cn.itheima.pojo"/>
    </typeAliases>
    
    
    <mappers>
        <mapper resource="cn/itheima/dao/UserMapper.xml"/>
    </mappers>
    
</configuration>

　　2.书写spring配置文件。依次配置连接池，session工厂，配置dao(这里采用原先的dao开发方式)

    <!-- 读取数据库信息配置文件 -->
    <context:property-placeholder location="classpath:db.properties"/>
    <!-- 配置连接池 -->                            
    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
        <property name="driverClass" value="${jdbc.driverClass}" ></property>
        <property name="user" value="${jdbc.user}" ></property>
        <property name="password" value="${jdbc.password}" ></property>
    </bean>

    <!-- 配置工厂 -->
    <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 连接池 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- mybatis主配置信息 -->
        <property name="configLocation" value="classpath:sqlMapConfig.xml"></property>
    </bean>
    
    <!-- 配置dao -->
    <bean name="userDao" class="cn.itheima.dao.impl.UserDaoImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>

　　3.创建实体类

public class User implements Serializable{
    
    private Integer user_id;
    private String user_name;
    
    public Integer getUser_id() {
        return user_id;
    }
    public void setUser_id(Integer user_id) {
        this.user_id = user_id;
    }
    public String getUser_name() {
        return user_name;
    }
    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }
    @Override
    public String toString() {
        return "User [user_id=" + user_id + ", user_name=" + user_name + "]";
    }
}

　　4.创建dao接口和dao实现类

public interface UserDao {

    public List<User> findUserList();
}

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {

    public List<User> findUserList() {
        //通过继承sqlSessionDaoSupprot,调用getSqlSession获得session
        SqlSession session = super.getSqlSession();
        
        List<User> list = session.selectList("test.findUserList");
        
        return list;
    }

    
}

　　5.创建映射文件userMapper.xml

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

<mapper namespace="test">
    <select id="findUserList" resultType="User">
        select * from user2
    </select>
</mapper>

　　6.书写测试类

public class Junit {

    @Test
    public void fun1() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
        
        UserDao dao = (UserDao) ac.getBean("userDao");
        
        List<User> list = dao.findUserList();
        
        System.out.println(list);
    }
}