MyBatis3 之增刪改查操作

55bd 12年前發布 | 168K 次閱讀 MyBatis3 持久層框架

MyBatis3 之 CRUD：

jar包就不上了，主要看代碼。先總覽一下文件結構：

MyBatis3 之增刪改查操作

然后是代碼：

1）configuration.xml ， MyBatis主配置文件

<?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">

<!-- 注意：每個標簽必須按順序寫，會提示錯誤：-->
<configuration>
    <!-- 屬性配置 -->
    <properties resource="jdbc.properties"/>

    <!-- 設置緩存和延遲加載等等重要的運行時的行為方式 -->
    <settings>
        <!-- 設置超時時間，它決定驅動等待一個數據庫響應的時間  -->
        <setting name="defaultStatementTimeout" value="25000"/>
    </settings>

    <!-- 別名 -->
    <typeAliases>
        <typeAlias alias="User" type="com.mybatis.model.User"/>
    </typeAliases>

    <environments default="development">
        <!-- environment 元素體中包含對事務管理和連接池的環境配置 -->
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${driver}" />
                <property name="url" value="${url}" />
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
            </dataSource>
        </environment>
    </environments>

    <!-- ORM映射文件 -->
    <mappers>
        <mapper resource="com/mybatis/model/UserSqlMap.xml" />
    </mappers>

</configuration>

2)jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis
username=root
password=123456

3)log4j.properties

log4j.rootLogger=DEBUG,A1
# \u8f93\u51fa\u5230\u63a7\u5236\u53f0 
log4j.appender.A1=org.apache.log4j.ConsoleAppender 
log4j.appender.A1.layout=org.apache.log4j.PatternLayout 
log4j.appender.A1.layout.ConversionPattern=%d{yyyy-MM-dd HH\:mm\:ss} [\u65E5\u5FD7\u4FE1\u606F] %m%n

4）User .java

package com.mybatis.model;

import java.io.Serializable;

@SuppressWarnings("serial")
public class User implements Serializable {

    private int id;
    private String userName;
    private String password;

    public User(){
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

}

5)UserSqlMap.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper     
PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"     
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">     

<!-- namespace用于java代碼調用時識別指定xml的mapper文件 -->
<mapper namespace="com.mybatis.model.User">
    <!-- 配置ORM映射 -->
    <resultMap type="User" id="user_orm">
        <id property="id" column="id"/>
        <result property="userName" column="userName"/>
        <result property="password" column="password"/>
    </resultMap>

    <!-- 用來定義可重用的SQL代碼段 -->
    <sql id="demo_sql">
       userName,password
    </sql>

    <insert id="inser_user" parameterType="User">
        <!-- include 引用可重用的SQL代碼段 -->
        INSERT INTO USER(<include refid="demo_sql"/>) VALUES(#{userName},#{password})
    </insert>

    <update id="update_user" parameterType="User">
        UPDATE USER SET userName=#{userName} ,password=#{password}  WHERE id=#{id}
    </update>

    <update id="delete_user" parameterType="int">
        DELETE FROM USER WHERE id=#{id}
    </update>

    <select id="selectAll_user" useCache="false" flushCache="true" resultMap="user_orm">
        SELECT * FROM USER
    </select>

    <!-- 使用map傳人多個參數 -->
    <select id="selectList_user" useCache="false" flushCache="true" parameterType="map" resultMap="user_orm">
        SELECT * FROM USER LIMIT #{pageNow},#{pageSize} 
    </select>

    <select id="selectById_user" parameterType="int" resultType="User">
        SELECT * FROM USER WHERE id= #{id}
    </select>

    <select id="selectCount_user"  resultType="int">
        SELECT count(*) FROM USER 
    </select>

    <select id="selectByName_user" parameterType="String" resultType="User">
        SELECT * FROM USER WHERE userName= #{userName}
    </select>

</mapper>

6)SessionFactoryUtil.java MyBatis工具類，用于創建SqlSessionFactory

package com.mybatis.sessionfactory;

import java.io.IOException;
import java.io.Reader;

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

public class SessionFactoryUtil {

    private static final String RESOURCE = "Configuration.xml";
    private static SqlSessionFactory sqlSessionFactory = null;
    private static ThreadLocal<SqlSession> threadLocal = new ThreadLocal<SqlSession>();

    static {
        Reader reader = null;
        try {
            reader = Resources.getResourceAsReader(RESOURCE);
        } catch (IOException e) {
            throw new RuntimeException("Get resource error:"+RESOURCE, e);
        }

        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    }

    /**
     * Function  : 獲得SqlSessionFactory
     */
    public static SqlSessionFactory getSqlSessionFactory(){   
        return sqlSessionFactory;   
    }

    /**
     * Function  : 重新創建SqlSessionFactory
     */
    public static void rebuildSqlSessionFactory(){
        Reader reader = null;
        try {
            reader = Resources.getResourceAsReader(RESOURCE);
        } catch (IOException e) {
            throw new RuntimeException("Get resource error:"+RESOURCE, e);
        }

        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    }

    /**
     * Function  : 獲取sqlSession
     */
    public static SqlSession getSession(){
        SqlSession session = threadLocal.get();

        if(session!=null){
            if(sqlSessionFactory == null){
                getSqlSessionFactory();
            }
            //如果sqlSessionFactory不為空則獲取sqlSession，否則返回null
            session = (sqlSessionFactory!=null) ? sqlSessionFactory.openSession(): null;
        }

        return session;
    }

    /**
     * Function  : 關閉sqlSession
     */
    public static void closeSession(){
        SqlSession session = threadLocal.get();
        threadLocal.set(null);
        if(session!=null){
            session.close();
        }
    }
}

7)UserDao interface

package com.mybatis.dao;

import java.util.List;

import com.mybatis.model.User;

public interface UserDao {

    public User load(int id);
    public void add(User user);
    public void update(User user);
    public void delete(int id);
    public User findByName(String userName);
    public List<User>  queryAllUser();
    public List<User> list(int pageNow,int pageSize);
    public int getAllCount();

}

8)UserDaoImpl

package com.mybatis.dao.implment;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.ibatis.session.SqlSession;

import com.mybatis.dao.UserDao;
import com.mybatis.model.User;
import com.mybatis.sessionfactory.SessionFactoryUtil;


public class UserDaoImpl implements UserDao {

    public User load(int id){
        SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
        User user = (User) session.selectOne("com.mybatis.model.User.selectById_user", id);
        session.close();
        return user;
    }

    public void add(User user) {
        SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
        session.insert("com.mybatis.model.User.inser_user", user);
        session.commit();
        session.close();
    }

    public void update(User user){
        SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
        session.update("com.mybatis.model.User.update_user", user);
        session.commit();
        session.close();
    }

    public void delete(int id){
        SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
        session.delete("com.mybatis.model.User.delete_user", id);
        session.close();
    }

    public User findByName(String userName){
        SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
        User user = (User)session.selectOne("com.mybatis.model.User.selectByName_user", userName);
        session.close();
        return user;
    }

    @SuppressWarnings("unchecked")
    public List<User> queryAllUser() {
        SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
        List<User> list = session.selectList("com.mybatis.model.User.selectAll_user");
        session.close();
        return list;
    }

    @SuppressWarnings("unchecked")
    public List<User> list(int pageNow , int pageSize){
        SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
        Map<String,Object> params = new HashMap<String ,Object>();
        params.put("pageNow", pageNow);
        params.put("pageSize", pageSize);
        List<User> list = session.selectList("com.mybatis.model.User.selectList_user", params);
        session.close();
        return list;
    }

    public int getAllCount(){
        SqlSession session =SessionFactoryUtil.getSqlSessionFactory().openSession();
        int count = (Integer) session.selectOne("com.mybatis.model.User.selectCount_user");
        session.close();
        return count;
    }

}

9)測試類：

package com.mybatis.dao.implment;

import java.util.List;

import org.junit.Test;

import com.mybatis.dao.UserDao;
import com.mybatis.model.User;

public class UserDaoTest {

    private UserDao userDao = new UserDaoImpl();

    @Test
    public void testLoad(){
        User u = userDao.load(1);
        if(u!=null){
            System.out.println("UserId:"+u.getId()+"  UserName:"+u.getUserName()+"  Password:"+u.getPassword());
        }
        else{
            System.out.println("id不存在！！");
        }
    }

    @Test
    public void testAdd(){
        User user = new User();
        user.setUserName("admin5");
        user.setPassword("123456");
        userDao.add(user);
    }

    @Test
    public void testUpdate(){
        User user = new User();
        user.setId(2);
        user.setUserName("manager");
        user.setPassword("123456");
        userDao.update(user);
    }

    @Test
    public void testQueryAllUser(){
        List<User> list = userDao.queryAllUser();
        if(list!=null&list.size()>0){
            for(User u:list){
                System.out.println("UserId:"+u.getId()+"  UserName:"+u.getUserName()+"  Password:"+u.getPassword());
            }
        }
    }

    @Test
    public void testFindByName(){
        User u = userDao.findByName("admin");
        if(u!=null){
            System.out.println("UserId:"+u.getId()+"  UserName:"+u.getUserName()+"  Password:"+u.getPassword());
        }
        else{
            System.out.println("用戶名不存在！！");
        }
    }

    @Test
    public void testList(){
        List<User> list = userDao.list(1, 4);
        if(list!=null&list.size()>0){
            for(User u:list){
                System.out.println("UserId:"+u.getId()+"  UserName:"+u.getUserName()+"  Password:"+u.getPassword());
            }
        }
    }

    @Test
    public void testGetAllCount(){
            System.out.println("All Count : "+userDao.getAllCount());
    }

    @Test
    public void testDelete(){
        userDao.delete(3);
    }

}

10)執行testFindByName()：

MyBatis3 之增刪改查操作

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MyBatis3 持久層框架

MyBatis3 之增刪改查操作

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