Mybatis(配置)

Mybatis(配置总结)

一. Mybatis基本配置

1 . 首先在mvnre的仓库中找到SpringMVC的相应配置文件,传送门: http://mvnrepository.com

2 . 相应配置文件拷贝到pom.xml文件<dependencies>下.

    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>4.12</version>    </dependency>    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->    <dependency>      <groupId>org.mybatis</groupId>      <artifactId>mybatis</artifactId>      <version>3.4.2</version>    </dependency>    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->    <dependency>      <groupId>mysql</groupId>      <artifactId>mysql-connector-java</artifactId>      <version>5.1.40</version>    </dependency>

3 . 将以下配置拷贝到<build>下:

    <resources>      <resource>        <directory>src/main/resources</directory>        <includes>          <include>**/*.properties</include>          <include>**/*.xml</include>          <include>**/*.tld</include>        </includes>        <filtering>false</filtering>      </resource>      <resource>        <directory>src/main/java</directory>        <includes>          <include>**/*.properties</include>          <include>**/*.xml</include>          <include>**/*.tld</include>        </includes>        <filtering>false</filtering>      </resource>    </resources>

4 . 创建数据库userprac及User表,结构为user_id,user_name,user_des

5 . 在resources文件夹下创建db.properties数据库连接配置

jdbc.driver = com.mysql.jdbc.Driverjdbc.url = jdbc:mysql://localhost:3306/userpracjdbc.username = rootjdbc.password = 111111env_choosen = deve

6 . 新建config.xml文件导入数据库文件

<?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>    <!--这个配置文件中,所有的标签都有严格的顺序-->    <properties resource="db.properties"/>    <environments default="${env_choosen}">        <environment id="deve">            <transactionManager type="JDBC"></transactionManager>            <dataSource type="POOLED">                <property name="driver" value="${jdbc.driver}"/>                <property name="url" value="${jdbc.url}"/>                <property name="username" value="${jdbc.username}"/>                <property name="password" value="${jdbc.password}"/>            </dataSource>        </environment>    </environments>    <mappers>        <!--<mapper resource="com/lanou/mapper/UserMapper.xml"/>-->        <!--自动读取mapper包下的所有xml文件-->        <package name="com.lanou.mapper"/>    </mappers></configuration>

7 . 创建bean,mapper,test文件夹分别存放User实体类,UserMapper UserMapper.xml接口文件,BatisTest测试类文件

User实体类:

package com.lanou.bean;public class User {    private Integer id;    private String name;    private String des;    @Override    public String toString() {        return "User{" +                "id=" + id +                ", name='" + name + '\'' +                ", des='" + des + '\'' +                '}';    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getDes() {        return des;    }    public void setDes(String des) {        this.des = des;    }}

接口: UserMapper

package com.lanou.mapper;import com.lanou.bean.User;import org.apache.ibatis.annotations.Param;/** * Created by dllo on 17/10/18. */public interface UserMapper {    Integer updataUser(User user);    Integer updataUserName(@Param("id")Integer id, @Param("name")String name);    Integer deleteUser(@Param("lastname")String lastname);    void  insterUser(@Param("name")String name,@Param("des")String des);}

接口: UserMapper.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"><!--namespace 一般写对应的接口路径--><mapper namespace="com.lanou.mapper.UserMapper">    <resultMap id="BaseMap" type="com.lanou.bean.User">        <id column="user_id" property="id"/>        <result column="user_name" property="name"/>        <result column="user_des" property="des"/>    </resultMap>    <sql id="Column_List">        user_id,user_name,user_des    </sql>    <select id="findAllUser" resultMap="BaseMap">        SELECT        <include refid="Column_List"/>        FROM user WHERE user_des = #{des}    </select>    <update id="updataUser" parameterType="com.lanou.bean.User">        UPDATE user SET user_name FROM user WHERE user_id=#{id};    </update>    <update id="updataUserName" parameterType="com.lanou.bean.User">        UPDATE user SET user_name = #{name} WHERE user_id=#{id};    </update>    <delete id="deleteUser" parameterType="com.lanou.bean.User">        DELETE FROM user WHERE user_name LIKE CONCAT(#{lastname},'%')    </delete>    <insert id="insterUser" parameterType="com.lanou.bean.User" useGeneratedKeys="true" keyProperty="id">        INSERT INTO user VALUES (NULL ,#{name},#{des})    </insert></mapper>

测试类:``BatisTest

package com.lanou.test;import com.lanou.mapper.UserMapper;import org.apache.ibatis.io.Resources;import org.apache.ibatis.plugin.Interceptor;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import org.junit.Test;import java.io.IOException;import java.io.InputStream;/** * Created by dllo on 17/10/18. */public class BatisTest {    @Test    public void test() throws IOException {        //        1. 加载config文件        String re = "config.xml";        InputStream stream = Resources.getResourceAsStream(re);//        2. 创建SqlSessionFactory        SqlSessionFactory factory =                new SqlSessionFactoryBuilder().build(stream);//        3. 生产sqlSession对象        SqlSession session = factory.openSession();//        4. 获取mapper对象        UserMapper mapper = session.getMapper(UserMapper.class);        Integer result = mapper.updataUserName(1,"李雷");        session.commit();        session.close();    }    @Test    public void test1() throws IOException {        //        1. 加载config文件        String re = "config.xml";        InputStream stream = Resources.getResourceAsStream(re);//        2. 创建SqlSessionFactory        SqlSessionFactory factory =                new SqlSessionFactoryBuilder().build(stream);//        3. 生产sqlSession对象        SqlSession session = factory.openSession();//        4. 获取mapper对象        UserMapper mapper = session.getMapper(UserMapper.class);        Integer result = mapper.deleteUser("张");        if (result > 0 ){            System.out.println("成功");        }else {            System.out.println("失败");        }        session.commit();        session.close();    }    @Test    public void test2() throws IOException {        //        1. 加载config文件        String re = "config.xml";        InputStream stream = Resources.getResourceAsStream(re);//        2. 创建SqlSessionFactory        SqlSessionFactory factory =                new SqlSessionFactoryBuilder().build(stream);//        3. 生产sqlSession对象        SqlSession session = factory.openSession();//        4. 获取mapper对象        UserMapper mapper = session.getMapper(UserMapper.class);         mapper.insterUser("韩梅梅","学员");        session.commit();        session.close();    }}

8 . 运行测试类文件可以看到相应结果

MyBatis是一个支持普通SQL查询，存储过程和高级映射的优秀持久层框架