Mybatis 配置文件

1、核心配置文件 sqlMapConfig.xml

<?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>
    <properties resource="jdbc.properties" />
    <!-- 别名 包以其子包下所有类 头字母大小都行 -->
    <typeAliases>
        <!-- <typeAlias type="cn.lijun.mybatis.pojo.User" alias="User"/> -->
        <package name="com.zlh.mybatis.pojo" />
    </typeAliases>
    <!-- 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="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.user}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>
    <!-- 映射器 -->
    <mappers>
        <mapper resource="sqlmap/User.xml" />
        <mapper resource="com/zlh/mybatis/mapper/UserMapper.xml"/>
        <mapper resource="com/zlh/test/test.xml"/>
    </mappers>
</configuration>

2、sql语句 User.xml

<?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="user">
    <select id="findUserById" parameterType="Integer" resultType="com.zlh.mybatis.pojo.User" >
        SELECT * FROM user WHERE id = #{id}
    </select>
    <select id="findUserByUserName" parameterType="String" resultType="com.zlh.mybatis.pojo.User" >
        SELECT * FROM user WHERE username LIKE "%"#{username}"%"
    </select>
    <select id="findAllUser" parameterType="Integer" resultType="com.zlh.mybatis.pojo.User" >
        SELECT * FROM user 
    </select>
    <insert id="insertUser" parameterType="com.zlh.mybatis.pojo.User">
        INSERT INTO user (username,birthday,sex,address) VALUES (#{username},#{birthday},#{sex},#{address})
    </insert>
    <update id="updateUser" parameterType="com.zlh.mybatis.pojo.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>

3、日志文件 log4j.properties

# 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

4、数据库文件 jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
jdbc.user=root
jdbc.password=root

5、测试类

package com.zlh.mybatis.junit;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.zlh.mybatis.pojo.User;

public class MybatisFirstTest {

    @Test
    public void testMybatis() throws IOException {
        // 1加载核心配置文件
        String resource = "sqlMapConfig.xml";
        InputStream in = Resources.getResourceAsStream(resource);
        // 2创建sqlSessionFactory
        SqlSessionFactory s = new SqlSessionFactoryBuilder().build(in);
        // 3创建sqlSession
        SqlSession sqlSession = s.openSession();
        // 4执行sql语句
        User u = sqlSession.selectOne("user.findUserById", 10);
        System.out.println(u);
    }
}