1.結構圖

2.User實體類

package com.itheima.domain;

import java.util.Date;

public class User {
    private Integer uId;
    private String userName;
    private String uSex;
    private Date uBirthday;
    private String uAddress;

    public Integer getuId() {
        return uId;
    }

    public void setuId(Integer uId) {
        this.uId = uId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getuSex() {
        return uSex;
    }

    public void setuSex(String uSex) {
        this.uSex = uSex;
    }

    public Date getuBirthday() {
        return uBirthday;
    }

    public void setuBirthday(Date uBirthday) {
        this.uBirthday = uBirthday;
    }

    public String getuAddress() {
        return uAddress;
    }

    public void setuAddress(String uAddress) {
        this.uAddress = uAddress;
    }

    @Override
    public String toString() {
        return "User{" +
                "uId=" + uId +
                ", userName='" + userName + '\'' +
                ", uSex='" + uSex + '\'' +
                ", uBirthday=" + uBirthday +
                ", uAddress='" + uAddress + '\'' +
                '}';
    }
}
 

3.IUserDao介面

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;

public interface IUserDao {
    //查詢所有
    List<User> findAll();
    //儲存一個
    void saveUser(User user);
    //修改一個
    void updateUser(User user);
    //刪除一個
    void deleteUser(String userId);
}

4.IUserMapper對應介面的配置檔案

<?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">
<!--執行的介面：隔離-->
<mapper namespace="com.itheima.dao.IUserDao">
    <!--1.起別名-->
    <!--2.resultMap-->
    <!--
        解決domain中屬性和資料庫段名不匹配問題
        還有起別名的方式：屬性名as資料庫名
    -->
    <resultMap id="userMap" type="com.itheima.domain.User">
        <!--主鍵欄位-->
        <id property="uId" column="id"></id>
        <!--非主鍵欄位-->
        <result property="userName" column="username"></result>
        <result property="uSex" column="sex"></result>
        <result property="uBirthday" column="birthday"></result>
        <result property="uAddress" column="address"></result>
    </resultMap>
    <!--查詢所有-->
    <!--
        對映機制：
        不寫
            resultType="com.itheima.domain.User"
         而是
            resultMap="userMap"
    -->
    <select id="findAll" resultMap="userMap">
        select * from user
    </select>
    <!--插入一個-->
    <select id="saveUser" parameterType="com.itheima.domain.User">
        insert into user(username,sex,birthday,address)values(#{userName},#{uSex},#{uBirthday},#{uAddress})
    </select>
</mapper>
 

5.SqlMapConfig mybatis主配置檔案

<?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">
<!--mybatis的主配置-->
<configuration>
    <!--配置環境-->
    <environments default="mysql">
        <!--配置環境-->
        <environment id="mysql">
            <!--配置事務-->
            <transactionManager type="JDBC"></transactionManager>
            <!--配置連線池-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/db_mybatis"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <!--xml方式進行配置-->
    <mappers>
        <mapper resource="com/itheima/dao/IUserMapper.xml"></mapper>
    </mappers>
</configuration>

6.測試類

package com.ithiema;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.Date;
import java.util.List;

/*又菜又愛玩*/
public class MybatisCRUD {
    private  InputStream inputStream;
    private  SqlSessionFactory factory;
    private  SqlSession sqlSession;
    private IUserDao userDao;
    //1.一上來就執行好嗎哈哈哈
    @Before
    public void init()throws Exception{
        //1.獲取位元組流
        inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.建立工廠
        factory = new SqlSessionFactoryBuilder().build(inputStream);
        //3.獲取sqlSession物件
        sqlSession = factory.openSession();
        //4.通過IUserDao.class位元組碼獲取userDao
        userDao = sqlSession.getMapper(IUserDao.class);
    }
    /*查詢所有*/
    @Test
    public void testFindAll(){
        //5.執行查詢所有
        List<User> users = userDao.findAll();
        for (User user:users){
            System.out.println(user);
        }
    }
    /*儲存一個*/
    @Test
    public void testSaveUser(){
        User user = new User();
        user.setUserName("李四");
        user.setuSex("男");
        user.setuBirthday(new Date());
        user.setuAddress("駐馬店");
        userDao.saveUser(user);
        System.out.println("儲存成功....");
    }
    //都在後面執行好嗎哈哈哈
    @After
    public void destroy()throws Exception{
        //6.提交事務
        sqlSession.commit();
        //6.釋放資源
        sqlSession.close();
        inputStream.close();
    }
    /*不打註釋就會出現空指標異常*/
}

7.依賴pomxl

<dependencies>
    <!--sql驅動：連線資料庫用-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.6</version>
    </dependency>
    <!--測試的依賴-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <!--日誌-->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <!--mybatis環境-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.5</version>
    </dependency>
</dependencies>