mybatis增删查改

这里还需要一个XML文件，与前一小节中一样，使用的是 User.xml，在这我们分别对应了增删改查的操作(每一个操作的 ID 对应于IUser接口的方法)，其内容如下：

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="com.yiibai.mybatis.dao.IUser">

    <select id="getUser" parameterType="int"
        resultType="com.yiibai.mybatis.models.User">
        SELECT *
        FROM USER
        WHERE id = #{userId}
    </select>


    <insert id="insertUser" parameterType="User">
        INSERT INTO USER(name,
        dept, website,phone)
        VALUES(#{name}, #{dept}, #{website}, #{phone})
    </insert>

    <select id="getUserList" resultType="com.yiibai.mybatis.models.User">
        SELECT * FROM USER
    </select>

    <update id="updateUser" parameterType="User">
        UPDATE USER
        SET
        name=
        #{name},
        dept = #{dept},
        website = #{website},
        phone = #{phone}
        WHERE
        id =
        #{id}
    </update>

    <delete id="deleteUser" parameterType="int">
        DELETE FROM USER WHERE id = #{id}
    </delete>

</mapper>

测试程序主类：

import java.io.Reader;
import java.text.MessageFormat;
import java.util.List;

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 com.yiibai.mybatis.dao.IUser;
import com.yiibai.mybatis.models.User;

public class Main {
    private static SqlSessionFactory sqlSessionFactory;
    private static Reader reader;

    static {
        try {
            reader = Resources.getResourceAsReader("config/Configure.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static SqlSessionFactory getSession() {
        return sqlSessionFactory;
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        SqlSession session = sqlSessionFactory.openSession();
        try {
            //sqlSessionFactory.getConfiguration().addMapper(IUser.class);
            //User user = (User) session.selectOne( "com.yiibai.mybatis.models.UserMapper.getUserByID", 1);

            // 用户数据列表
            getUserList();
            // 插入数据
            // testInsert();

            // 更新用户
            //testUpdate();

            // 删除数据
            //testDelete();

        } finally {
            session.close();
        }
    }

    //
    public static void testInsert()
    {
        try
        {
            // 获取Session连接
            SqlSession session = sqlSessionFactory.openSession();
            // 获取Mapper
            IUser userMapper = session.getMapper(IUser.class);
            System.out.println("Test insert start...");
            // 执行插入
            User user = new User();
            user.setId(0);
            user.setName("Google");
            user.setDept("Tech");
            user.setWebsite("http://www.google.com");
            user.setPhone("120");
            userMapper.insertUser(user);
            // 提交事务
            session.commit();

            // 显示插入之后User信息
            System.out.println("After insert");
            getUserList();
            System.out.println("Test insert finished...");
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    // 获取用户列表
    public static void getUserList() {
        try {
            SqlSession session = sqlSessionFactory.openSession();
            IUser iuser = session.getMapper(IUser.class);
            // 显示User信息
            System.out.println("Test Get start...");
            printUsers(iuser.getUserList());
            System.out.println("Test Get finished...");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void testUpdate()
    {
        try
        {
            SqlSession session = sqlSessionFactory.openSession();
            IUser iuser = session.getMapper(IUser.class);
            System.out.println("Test update start...");
            printUsers(iuser.getUserList());
            // 执行更新
            User user = iuser.getUser(1);
            user.setName("New name");
            iuser.updateUser(user);
            // 提交事务
            session.commit();
            // 显示更新之后User信息
            System.out.println("After update");
            printUsers(iuser.getUserList());
            System.out.println("Test update finished...");
        }catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    // 删除用户信息
    public static void testDelete()
    {
        try
        {
            SqlSession session = sqlSessionFactory.openSession();
            IUser iuser = session.getMapper(IUser.class);
            System.out.println("Test delete start...");
            // 显示删除之前User信息
            System.out.println("Before delete");
            printUsers(iuser.getUserList());
            // 执行删除
            iuser.deleteUser(2);
            // 提交事务
            session.commit();
            // 显示删除之后User信息
            System.out.println("After delete");
            printUsers(iuser.getUserList());
            System.out.println("Test delete finished...");
        }catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    /**
     * 
     * 打印用户信息到控制台
     * 
     * @param users
     */
    private static void printUsers(final List<User> users) {
        int count = 0;

        for (User user : users) {
            System.out.println(MessageFormat.format(
                    "============= User[{0}]=================", ++count));
            System.out.println("User Id: " + user.getId());
            System.out.println("User Name: " + user.getName());
            System.out.println("User Dept: " + user.getDept());
            System.out.println("User Website: " + user.getWebsite());
        }
    }
}