Mybatis增删改查实例

------1，采用xml配置方式来做

建表语句：

采用sqlserver数据库库名为：test

use test;
CREATE TABLE dbo.user1(
id int IDENTITY(1,1) NOT NULL,
NAME varchar(20) DEFAULT NULL,
age int DEFAULT NULL,
PRIMARY KEY (id));

1，先写个共有类来做连接及关闭连接

package com.cn.mybatis;
import java.io.IOException;
import java.io.InputStream;
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 MybatisUtils {
   public static SqlSession getSession(){
       InputStream inputStream = null;
       SqlSessionFactory sessionFactory=null;
       SqlSession session = null;
       try {
           inputStream = Resources.getResourceAsStream("com/cn/sources/mybatisConf.xml");
           sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
           session = sessionFactory.openSession(true);
       } catch (IOException e) {
           e.printStackTrace();
       }
       return session;
   }
   public static void closeSession(SqlSession session) throws IOException{
       if(session != null){
           session.close();
       }
   }

}

2,数据库连接mybatisConf.xml内容

<?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>
<properties resource="dataSource.properties"/>
      <environments default="development">
         <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>
      <mappers>
          <mapper resource="com/cn/sources/mapper.xml"/>
      </mappers>
</configuration>

3，数据库连接的参数放置在src下 dataSource.properties

url=jdbc:sqlserver://chot3r8csts02:1433;DatabaseName=test
username=devplogin
password =devplogin

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driver=com.microsoft.sqlserver.jdbc.SQLServerDriver

4，编写mapper.xml配置文件内容，放置sql语句

<?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.cn.sources">
<insert id="insertUser" parameterType="com.cn.bean.User">
      insert into user1(name,age) values(#{name},#{age})
</insert>
<select id="selectUser" parameterType="int" resultType="com.cn.bean.User">
    select * from user1 where id=#{id}
</select>
<update id="updateUser" parameterType="Object">
   update user1 set name = #{0}
</update>

</mapper>

5，编写实体类

package com.cn.bean;
import java.io.Serializable;
/**
* @author yuchao
*
* @school 南阳理工软件学院移动设备应用与开发移动四班
*
* @email [email protected]
*
* @time 2014年10月2日下午7:45:52
*/

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

   private int id;
   private String name;
   private int age;

   public User() {
   }

   public User(int id, String name, int age) {

       this.id = id;
       this.name = name;
       this.age = age;
   }

   public User(String name, int age) {
       this.name = name;
       this.age = age;
   }

   public int getId() {
       return id;
   }

   public void setId(int id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public int getAge() {
       return age;
   }

   public void setAge(int age) {
       this.age = age;
   }

   @Override
   public String toString() {
       return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
   }

}

6，开始连接测试增删改查

package com.cn.mybatis;

import java.io.IOException;
import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import com.cn.bean.User;

/**
* @author yuchao
*
* @school 南阳理工软件学院移动设备应用与开发移动四班
*
* @email [email protected]
*
* @time 2014年10月2日下午7:56:43
*/
public class TestMybatis {
   @Test
   public void testInsert() throws IOException{
       SqlSession session = null;
       try{
       //注：该路径填写相对路径    propoties文件一定要放在src下面，否则容易引发错误
       session = MybatisUtils.getSession();
       User user = new User("余超", 21);
       String statement = "com.cn.sources.insertUser";
       int i = session.insert(statement, user);
       if (i == 1)
           System.out.println("新增加用户成功！！！！");
       else
           System.out.println("添加用户失败！！！");
       }catch(Exception e){
           e.printStackTrace();
       }finally {
           MybatisUtils.closeSession(session);
       }
   }
   @Test
   public void testSelect() throws IOException{
       SqlSession session = null;
       try{
       //注：该路径填写相对路径    propoties文件一定要放在src下面，否则容易引发错误
       session = MybatisUtils.getSession();
       String statement = "com.cn.sources.selectUser";
       List<User> list = session.selectList(statement, 1);
       if(list != null && list.size()>0){
           for(User user : list){
               System.out.println("用户名为："+ user.getName() + ",年龄为:" + user.getAge());
           }
       }
       }catch(Exception e){
           e.printStackTrace();
       }finally {
           MybatisUtils.closeSession(session);
       }
   }
   @Test
   public void testUpdate() throws IOException{
       SqlSession session = null;
       try{
       //注：该路径填写相对路径    propoties文件一定要放在src下面，否则容易引发错误
       session = MybatisUtils.getSession();
       String statement = "com.cn.sources.updateUser";
       session.update(statement, "浪君");//如果update语句中包含多个传参则还不能直接用这种方式
       }catch(Exception e){
           e.printStackTrace();
       }finally {
           MybatisUtils.closeSession(session);
       }
   }

}

----------------------第二种方式是完全不使用xml配置文件，采用注解的方式来做

1,编写实体类

2，编写映射类，做sql查询及接口方法

package com.cn.mybatis;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.cn.bean.User;

public interface BlogMapper {
   @Select("SELECT * FROM user1 WHERE id = #{id}")
   User selectUser(int id);
   @Delete("delete from user1 where id = #{id}")
   void deleteUser(int id);
   @Update("update user1 set name = #{name} where id = #{id}")
   void updateUser(@Param("name")String name,@Param("id")int id);
}

3，连接及增删改查

package com.cn.mybatis;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.datasource.pooled.PooledDataSourceFactory;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.junit.Test;

import com.cn.bean.User;

public class TestMybatisOther {
   private static final SqlSessionFactory SqlSessionFactory;
   static{
       SqlSessionFactory = getSqlSessionFactory();
   }
   @Test
   public void testSelect(){
       SqlSession session = getSqlSession();
       try {
              BlogMapper mapper = session.getMapper(BlogMapper.class);
              User user = mapper.selectUser(2);
              System.out.println("用户名为："+ user.getName() + ",年龄为:" + user.getAge());
           } finally {
              session.close();
           }
   }
   @Test
   public void testDelete(){
       SqlSession session = getSqlSession();
       try {
              BlogMapper mapper = session.getMapper(BlogMapper.class);
              mapper.deleteUser(1);
              session.commit();
              System.out.println("删除成功！");
           } finally {
              session.close();
           }
   }
   @Test
   public void testUpdate(){//传入多个参数可使用注解的方式
       SqlSession session = getSqlSession();
       try {
              BlogMapper mapper = session.getMapper(BlogMapper.class);
              mapper.updateUser("志豪", 2);
              session.commit();
              System.out.println("更新成功！");
           } finally {
              session.close();
           }
   }

   //SqlSessionFactory最好被创建一次而不要被多次创建
   public static SqlSessionFactory getSqlSessionFactory(){
       PooledDataSourceFactory pooledDataSourceFactory = new PooledDataSourceFactory();
       pooledDataSourceFactory.setProperties(getProperties());
       DataSource dataSource = pooledDataSourceFactory.getDataSource();
       TransactionFactory transactionFactory = new JdbcTransactionFactory();//加入事务控制，需要注意的是：需要在执行后commit否则默认会执行回滚操作
       Environment environment = new Environment("development", transactionFactory, dataSource);
       Configuration configuration = new Configuration(environment);
       configuration.addMapper(BlogMapper.class);
       SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(configuration);
       return sqlSessionFactory;
   }
   //SqlSession可被多次创建
   public static SqlSession getSqlSession(){
       //不采用xml方式获取到configuration
       SqlSession session = SqlSessionFactory.openSession();
       return session;
   }

   //获取数据库连接信息并放置到Properties文件中
   public static Properties getProperties(){
       Properties properties = new Properties();
       properties.setProperty("driver", "com.microsoft.sqlserver.jdbc.SQLServerDriver");
       properties.setProperty("url", "jdbc:sqlserver://chot3r8csts02:1433;DatabaseName=test");
       properties.setProperty("username", "devplogin");
       properties.setProperty("password", "devplogin");
       return properties;
   }
}

--------总结：各有各的好处，一般用的多的是xml配置方式

Mybatis增删改查实例

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