mybatis 配置文件 代码复用

主配置文件 mybatis-config.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>
    <settings>
    	<setting name="mapUnderscoreToCamelCase" value="true"/>
        <setting name="logImpl" value="LOG4J"/>
    </settings>

    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <package name="com.wei.dao" />
    </mappers>
</configuration>

映射配置文件 mapper.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="com.wei.dao.UserMapper">
    <!--resultMap 实体类属性 映射 数据库的列 -->
    <!--需要在使用这个的地方，使用resultMap 属性， 不需要resultType -->
    <resultMap id="userResultMap" type="com.wei.pojo.User">
        <result property="id" column="id"/>
        <result property="name" column="name"/>
        <result property="pwd" column="pwd"/>
    </resultMap>
    <!--查询所有-->
    <select id="findAll" resultType="com.wei.pojo.User">
      select * from user
     </select>
    <!--通过id查找-->
    <select id="findById" resultType="com.wei.pojo.User">
      select * from user where id = #{id}
     </select>
    <!--通过名字和密码查找-->
    <select id="findByNP" resultType="com.wei.pojo.User">
            select * from user where name = #{name} and pwd = #{pwd}
    </select>
    <!--添加用户-->
    <insert id="addUser" parameterType="com.wei.pojo.User">
        insert  into user values(#{user.id},#{user.name},#{user.pwd})
    </insert>
    <!--修改用户-->
    <update id="updateUser" parameterType="com.wei.pojo.User">
        update user set name = #{name},pwd = #{pwd} where id = #{id}
    </update>
    <!--删除用户-->
    <delete id="deleteUser" parameterType="integer">
        delete from user where id = #{id}
    </delete>
    <!--用map添加-->
    <insert id="addUserMap" parameterType="map">
        insert  into user values(#{mapId},#{mapName},#{mapPassword})
    </insert>
    <!--分页-->
    <select id="getUserByLimit" resultType="com.wei.pojo.User">
        select * from user limit #{begin},#{end}
    </select>
</mapper>

mybatis测试类代码

String  resource = "mybatis-config.xml";
        try {
            InputStream in = Resources.getResourceAsStream(resource);
            SqlSession sqlSession = new SqlSessionFactoryBuilder().build(in).openSession();
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            List<User> all = mapper.findAll();
            System.out.println(all);
        } catch (Exception e) {
            e.printStackTrace();
        }

mybatis工具类

package com.wei.utils;
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 java.io.InputStream;

public class MybatisUtils {
    private static  SqlSessionFactory sqlSessionFactory;
    static{
        try {
            String  resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    public static SqlSession getSqlsession(){
        return sqlSessionFactory.openSession();
    }
}

pow.xml maven配置文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.wei</groupId>
    <artifactId>mybatis-study</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.30</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    </dependencies>

</project>

LOG4J日志配置文件 log4j.properties

#将等级为DEBUG的日志信息输出到console和file这两个目的地，console和file的定义在下面的代码
log4j.rootLogger=DEBUG,console,file

#控制台输出的相关设置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

#文件输出的相关设置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/kuang.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n

#日志输出级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG