mybatis学习demo3之添加(涉及序列)和删除

接着把删除和添加的demo上传一下,因为添加用到了oracle的自增长序列,而在mybatis的mapper文件中也提供了selectKey标签来操作查询序列

demo依旧是前2个的demo,同样的实体类和数据库表.只是在接口中和对应的映射文件中添加了相应的删除和添加方法

接口的方法:

package test.batics.service;

import java.util.List;

import org.apache.ibatis.session.RowBounds;

import test.batics.entity.User;

public interface UserMapper {
	//通过id查询
	User findById(Long id);
	//查询全部
	List<User> findAll();
	//分页查询
	List<User> findPage(RowBounds bounds);
	//修改操作
	int updateById(User user);
	//添加操作
	int addUser(User user);
	//通过id删除操作
	int deleteUser(Long id);
}

映射文件:

<?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="test.batics.service.UserMapper">
	<select id="findById" parameterType="java.lang.Long" resultType="User">
		select * from t_user where id = #{value} 
	</select>
	<select id="findAll" resultType="User">
		select * from t_user
	</select>
	<select id= "findPage" resultType="User">
		select * from t_user
	</select>
	<update id="updateById" parameterType="User">
		update t_user
		<set> 
			<if test="email != null and email !=''">
				 email = #{email,jdbcType=VARCHAR}
			</if>
			<if test="name !=null and name != ''">
				name = #{name,jdbcType=VARCHAR}
			</if>
		</set>
		where id = #{id}
	</update>
	<insert id="addUser" parameterType="User">
		<!-- 通过序列来作为id -->
		<selectKey keyProperty="id" resultType="java.lang.Long" order="BEFORE">
			select seq_user_id.NEXTVAL AS VALUE FROM DUAL
		</selectKey>
		insert into t_user (id,email,login_name,name) 
		values(
			#{id},
			#{email},
			#{loginName},
			#{name}
		)
	</insert>
	<!-- 通过Id删除 -->
	<delete id="deleteUser" parameterType="java.lang.Long">
		delete from t_user where id = #{value}
	</delete>
</mapper>

测试类:

package test.batics.demo;

import java.util.List;

import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;

import test.batics.entity.User;
import test.batics.service.UserMapper;
import test.batics.util.BatisUtil;

public class RunDemo {
	static final String NAME_SPACE = "test.batics.service.UserMapper";

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		SqlSession session = BatisUtil.getSession();
		RowBounds bounds = new RowBounds(3, 2);
		List<User> users = null;	
		/**
		 * 分页的第一种方法
		 */
		/*users = searchPager1(session, bounds);
		print(users);*/
		/**
		 * 分页的第二种方法
		 */
		/*users = searchPager2(session, bounds);
		print(users);*/	
		/**
		 * 修改操作
		 * 1.通过id查询出当前 用户
		 * 2.在修改此用户信息
		 */
		/*update(session);*/
		
		/**
		 * 添加操作,这里 通过序列添加其id
		 */
		/*add(session);*/
		
		/**
		 * 删除操作
		 */
		deleteUser(session);
		
	}
	//打印得到的值
	public static void print(List<User> users){
		for (User user : users) {
			System.out.println("email=" + user.getEmail() + "\t" + "loginName="
					+ user.getLoginName() + "\t" + "name=" + user.getName()
					+ "\t" + "password=" + user.getPassword() + "\t" + "id="
					+ user.getId());
		}
	}
	//分页的第一种方式
	public static List<User> searchPager1(SqlSession session,RowBounds bounds){
		List<User> users = session.selectList(NAME_SPACE+".findAll", "", bounds);
		return users;
	}
	
	//分页的第二种方式,在接口方法中加上bounds参数
	public static List<User> searchPager2(SqlSession session,RowBounds bounds){
		UserMapper mapper = session.getMapper(UserMapper.class);
		List<User> users = mapper.findPage(bounds);
		return users;
	}
	
	//修改操作
	public static void update(SqlSession session){
		UserMapper mapper = session.getMapper(UserMapper.class);
		User user = mapper.findById(2061L);
		user.setName("肥猫钓鱼");
		int result = mapper.updateById(user);
		if(result>0){
			System.out.println("修改成功");
		}
		//然后提交 关闭session
		session.commit();
		session.close();
	}
	
	//添加操作
	public static void add(SqlSession session){
		UserMapper mapper = session.getMapper(UserMapper.class);
		User user = new User();
		user.setEmail("[email protected]");
		user.setLoginName("testBatis");
		user.setName("testBatis");
		user.setPassword("test123");
		int result = mapper.addUser(user);
		if(result>0){
			System.out.println("添加成功");
		}
		session.commit();
		session.close();
	}
	
	//删除操作
	public static void deleteUser(SqlSession session){
		UserMapper mapper = session.getMapper(UserMapper.class);
		Long id = 2104L;
		int result  = mapper.deleteUser(id);
		if(result>0){
			System.out.println("删除成功");
		}
		session.commit();
		session.close();
	}
}

结果如下:

代码已上传,jar包的下载地址在第一个demo1中有说明,我就不再贴上了

mybatis学习demo3之添加(涉及序列)和删除

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