<?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>

    <!-- 和spring整合后 environments配置将废除 -->

    <environments default="development">

        <environment id="development">

            <!-- 使用jdbc事务管理 -->

            <transactionManager type="JDBC" />

            <!-- 数据库连接池 -->

            <dataSource type="POOLED">

                <property name="driver" value="com.mysql.jdbc.Driver" />

                <property name="url"

                    value="jdbc:mysql:///mybatis?characterEncoding=utf-8" />

                <property name="username" value="root" />

                <property name="password" value="123" />

            </dataSource>

        </environment>

    </environments>

    <mappers>

        <!-- <mapper resource="com/zzh/mapper/User.xml"/> -->

        <!-- 建议使用package

            这种情况下，接口名需要与对应的mapper.xml文件名一致    

        -->

        <package name="com.zzh.dao"/>

    </mappers>

</configuration>

<?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">

<!-- namespace：命名空间，用于隔离sql，还有一个很重要的作用，后面会讲 -->

<mapper namespace="test">

    <!-- id:statement的id 或者叫做sql的id-->

    <!-- parameterType:声明输入参数的类型 -->

    <!-- resultType:声明输出结果的类型，应该填写pojo的全路径 -->

    <!-- #{}：输入参数的占位符，相当于jdbc的？ -->

    <select id="queryUserById" parameterType="int" resultType="com.zzh.bean.User">

        SELECT * FROM `user` WHERE id  = #{id}

    </select>

    <!-- 根据用户名模糊查询用户列表

         #{} SELECT * FROM `user` WHERE id  = ? 占位符 ? == '字符串'

         ${} SELECT * FROM `user` WHERE username like  '%字符串%'

     -->

    <select id="findUserByUsername" parameterType="String"

        resultType="com.zzh.bean.User">

        select * from user where username like "%"#{value}"%"

    </select>

    <insert id="insertUser" parameterType="com.zzh.bean.User">

        <selectKey keyProperty="id" resultType="Integer" order="AFTER">

            select LAST_INSERT_ID()

        </selectKey>

        insert into user (username,sex,birthday,address) values (#{username},#{sex},#{birthday},#{address})

    </insert>

    <update id="updateUserById" parameterType="com.zzh.bean.User" >

        update user 

        set username=#{username},sex=#{sex},birthday=#{birthday},address=#{address}

        where id = #{id}

    </update>

    <delete id="deleteUserById" parameterType="Integer">

        delete from user where id=#{id}

    </delete>

</mapper>

在config下创建log4j.properties如下：

# Global logging configuration

log4j.rootLogger=DEBUG, stdout

# Console output...

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

mybatis默认使用log4j作为输出日志信息。

package com.zzh.bean;

import java.io.Serializable;

public class QueryVo implements Serializable{

    /**

     * 

     */

    private static final long serialVersionUID = 1L;

    private User user;

    public User getUser() {

        return user;

    }

    public void setUser(User user) {

        this.user = user;

    }

}

    <resultMap type="Orders" id="order">

        <result column="user_id" property="userId"/>

    </resultMap>

    <if test="sex != null and sex != ''">

        AND sex = #{sex}

    </if>

    <if test="username != null and username != ''">

        AND username LIKE

        '%${username}%'

    </if>

    <!-- where标签可以自动添加where，同时处理sql语句中第一个and关键字 

        注意此时处理的第一个and是条件语句前的and

    -->

    <where>

        <if test="sex != null">

            AND sex = #{sex}

        </if>

        <if test="username != null and username != ''">

            AND username LIKE

            '%${username}%'

        </if>

    </where>

    <sql id="selector">

        select * from user

    </sql>

    <select>

        <include refid="selector"></include>

    </select>

    <select id="queryUsersByIds" parameterType="QueryVo" resultType="User">

        <include refid="selector"></include>

        <where>

            <foreach collection="idsList" item="id" separator="," open="id in (" close=")">

                #{id}

            </foreach>

        </where>

    </select>

    <!-- 一对一查询 -->

    <resultMap type="Orders" id="oneToOne">

        <result column="id" property="id"/>

        <result column="user_id" property="userId"/>

        <result column="number" property="number"/>

        <association property="user" javaType="user">

            <id column="id" property="id"/>

            <result column="username" property="username"/>

        </association>

    </resultMap>

    <select id="findOrders" resultMap="oneToOne">

        select 

        o.id,

        o.user_id,

        o.number,

        o.createtime,

        u.id,

        u.username 

        from orders o 

        left join user u

        on o.user_id = u.id

    </select>

    <!-- 一对多查询 -->

    <resultMap type="User" id="user">

        <id column="user_id" property="id"/>

        <result column="username" property="username"/>

        <collection property="orderList" ofType="Orders">

            <id column="id" property="id"/>

            <result column="number" property="number"/>

            <result column="user_id" property="userId"/>

            <result column="createtime" property="createtime"/>

        </collection>

    </resultMap>

    <select id="findUserList" resultMap="user">

        SELECT 

        o.id,

        o.user_id,

        o.number,

        o.createtime,

        u.username 

        FROM user u 

        LEFT JOIN orders o

        ON o.user_id = u.id

    </select>

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans" 

       xmlns:context="http://www.springframework.org/schema/context" 

       xmlns:aop="http://www.springframework.org/schema/aop" 

       xmlns:tx="http://www.springframework.org/schema/tx" 

       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-4.2.xsd 

                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd 

                           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd 

                           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd ">

       <context:property-placeholder location="classpath:jdbc.properties"/>

       <bean name="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">

            <property name="driverClassName" value="${jdbc.driverClass}"></property>

            <property name="url" value="${jdbc.jdbcUrl}"></property>

            <property name="username" value="${jdbc.user}"></property>

            <property name="password" value="${jdbc.password}"></property>

       </bean>

       <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

            <property name="dataSource" ref="dataSource"></property>

            <!-- 核心配置文件位置 -->

            <property name="configLocation" value="classpath:SqlMapConfig.xml"></property>

       </bean>

       <!-- <bean name="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">

            <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>

            <property name="mapperInterface" value="com.zzh.mapper.UserMapper"></property>

       </bean> -->  

       <!-- Mapper动态代理开发 扫描

            此时spring将自动扫描该配置文件下的sqlSessionFactory，不需手动配置property标签

            name="basePackgae"指定spring去对应的包中扫描mapper

        -->

       <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

            <property name="basePackage" value="com.zzh.mapper"></property>

       </bean>                 

</beans>

<?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="com.zzh.mapper.UserMapper">

    <select id="findUserById" parameterType="Integer" resultType="User">

        select * from `user` where id  = #{id}

    </select>

</mapper>