MyBatis3 之增删节查操作 _Web前端

MyBatis3 之增删改查操作

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：每个标签必须按顺序写，会提示错误：-->
<configuration>
	<!-- 属性配置 -->
	<properties resource="jdbc.properties"/>
	
	<!-- 设置缓存和延迟加载等等重要的运行时的行为方式 -->
	<settings>
		<!-- 设置超时时间，它决定驱动等待一个数据库响应的时间  -->
		<setting name="defaultStatementTimeout" value="25000"/>
	</settings>
	
	<!-- 别名 -->
	<typeAliases>
		<typeAlias alias="User" type="com.mybatis.model.User"/>
	</typeAliases>
	
	<environments default="development">
		<!-- environment 元素体中包含对事务管理和连接池的环境配置 -->
		<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>

?jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8
username=root
password=123456

?log4j.properties

log4j.rootLogger=debug, stdout, R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%5p - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=firestorm.log

log4j.appender.R.MaxFileSize=100KB
log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

log4j.logger.com.codefutures=DEBUG

?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;
	}

}

?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代码调用时识别指定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>
	
	<!-- 用来定义可重用的SQL代码段 -->
	<sql id="demo_sql">
       userName,password
	</sql>
	
	<insert id="inser_user" parameterType="User">
		<!-- include 引用可重用的SQL代码段 -->
		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传人多个参数 -->
    <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>

    <!--模糊 MyIbatis 3.2.0-->
    <select id="selectUserByName" parameterType="String" resultMap="user_orm">
	     SELECT * FROM USER WHERE userName like "%"#{userName}"%"
	</select>
  	
</mapper>

? SessionFactoryUtil.java ?MyBatis工具类，用于创建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  : 获得SqlSessionFactory
	 */
	public static SqlSessionFactory getSqlSessionFactory(){   
        return sqlSessionFactory;   
    }
	
	/**
	 * Function  : 重新创建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  : 获取sqlSession
	 */
	public static SqlSession getSession(){
		SqlSession session = threadLocal.get();
		
		if(session!=null){
			if(sqlSessionFactory == null){
				getSqlSessionFactory();
			}
			//如果sqlSessionFactory不为空则获取sqlSession，否则返回null
			session = (sqlSessionFactory!=null) ? sqlSessionFactory.openSession(): null;
		}
		
		return session;
	}
	
	/**
	 * Function  : 关闭sqlSession
	 */
	public static void closeSession(){
		SqlSession session = threadLocal.get();
		threadLocal.set(null);
		if(session!=null){
			session.close();
		}
	}
}

?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();
	
}

?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;
	}
	
}

?测试类：

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("用户名不存在！！");
		}
	}
	
	@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);
	}

}