MyBatis的数据库操作入门（五）

UserMapper.java新增一个方法

package cn.bdqn.dao;

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

import cn.bdqn.pojo.User;

public interface UserMapper {

	List<User> getUserList();
	List<User> getUserLikeUserName(String userName);     //模糊查询
	List<User> getUserLikeUserNameAndUserRole(User user);
	List<User> getUserByMap(Map<String,Object> map);
}

UserMapper.xml新增一个select

<?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="cn.bdqn.dao.UserMapper">

	<select id="getUserList" resultType="cn.bdqn.pojo.User">
		Select * from smbms_user
	</select>
	
	<select id="getUserLikeUserName" parameterType="String" resultType="user">
  		select * from smbms_user where userName like concat('%',#{userName},'%')
  	</select>
  	
  	<select id="getUserLikeUserNameAndUserRole" parameterType="user" resultMap="userList">
  		select u.*,r.roleName from smbms_user u,smbms_role r 
  			where 
  			r.id=u.userRole 
  			and userRole=#{userRole} 
  			and userName like concat('%',#{userName},'%')
  	
  	</select>
  	
  	<resultMap type="user" id="userList">
  		<id column="id" property="id"/>
  		<result column="userName" property="userName" />
  		<result column="userCode" property="userCode" />
  		<result column="roleName" property="userRoleName" />
  	</resultMap>
  	
  	<select id="getUserByMap" parameterType="map" resultType="user">
  		select * from smbms_user where userRole=#{userRole} and userName like concat('%',#{userName},'%')
  	</select>
</mapper>

实体类代码：

package cn.bdqn.test;


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

import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;

import cn.bdqn.dao.UserMapper;
import cn.bdqn.pojo.User;
import cn.bdqn.util.MyBatisUtil;

public class Test {

	/*private static Logger logger = Logger.getLogger("Test");*/

	public static void main(String[] args) {

		//getUserCount();
		//getUserList();
		//getUserByName(sqlSession);
		//getUserLikeNameAndRole(sqlSession);
		SqlSession sqlSession = MyBatisUtil.getSqlSession();
		Map<String,Object> map=new HashMap<String,Object>();
		map.put("userRole", 3);
		map.put("userName", "孙");
		List<User> users = sqlSession.getMapper(UserMapper.class).getUserByMap(map);
		for (User user1 : users) {
			System.out.println(user1);
		}
		MyBatisUtil.closeSession(sqlSession);
	}

	
/*	private static void getUserLikeNameAndRole(SqlSession sqlSession) {
		User user=new User();
		user.setUserName("孙");
		user.setUserRole(3);
		List<User> users = sqlSession.getMapper(UserMapper.class).getUserLikeUserNameAndUserRole(user);
		
		for (User user1 : users) {
			System.out.println(user1);
		}
		MyBatisUtil.closeSession(sqlSession);
	}*/
	
	
	
/*	private static void getUserByName(SqlSession sqlSession) {
		List<User> users = sqlSession.getMapper(UserMapper.class).getUserLikeUserName("孙");
		for (User user : users) {
			System.out.println(user);
		}
		MyBatisUtil.closeSession(sqlSession);
	}*/
	
	
	
	
/*	public static void getUserList(){
		SqlSession session = MyBatisUtil.getSqlSession();
		//綁定Mapper接口
		List<User> userList = session.getMapper(UserMapper.class).getUserList();
		for (User user : userList) {
			logger.debug("用户：" + user);
		}
		MyBatisUtil.closeSession(session);
	}*/
	

/*	private static void getUserCount() {
		SqlSession session = MyBatisUtil.getSqlSession();
		// 调用mapper文件进行数据操作
		int count = session.selectOne("cn.bdqn.dao.UserMapper.count");

		logger.debug("用户数量是：" + count);
		MyBatisUtil.closeSession(session);
	}*/
}

运行时候把mybatis-config.xml中的

<setting name="autoMappingBehavior" value="NONE"/>注释掉，这样信息多点

运行结果：

[DEBUG] 2018-09-29 23:43:38,684 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Opening JDBC Connection
[DEBUG] 2018-09-29 23:43:38,907 org.apache.ibatis.datasource.pooled.PooledDataSource - Created connection 1182320432.
[DEBUG] 2018-09-29 23:43:38,908 cn.bdqn.dao.UserMapper.getUserByMap - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@4678c730]
[DEBUG] 2018-09-29 23:43:38,909 cn.bdqn.dao.UserMapper.getUserByMap - ==>  Preparing: select * from smbms_user where userRole=? and userName like concat('%',?,'%') 
[DEBUG] 2018-09-29 23:43:38,940 cn.bdqn.dao.UserMapper.getUserByMap - ==> Parameters: 3(Integer), 孙(String)
User [address=北京市朝阳区管庄新月小区12楼, birthday=Sun Jan 04 00:00:00 CST 1981, createdBy=1, creationDate=Wed May 06 10:52:07 CST 2015, gender=2, id=10, modifyBy=null, modifyDate=null, phone=13387676765, userCode=sunlei, userName=孙磊, userPassword=0000000, userRole=3, userRoleName=null]
User [address=北京市朝阳区建国门南大街10号, birthday=Sun Mar 12 00:00:00 CST 1978, createdBy=1, creationDate=Wed Nov 09 16:51:17 CST 2016, gender=2, id=11, modifyBy=null, modifyDate=null, phone=13367890900, userCode=sunxing, userName=孙兴, userPassword=0000000, userRole=3, userRoleName=null]
[DEBUG] 2018-09-29 23:43:38,998 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4678c730]
[DEBUG] 2018-09-29 23:43:38,999 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@4678c730]
[DEBUG] 2018-09-29 23:43:38,999 org.apache.ibatis.datasource.pooled.PooledDataSource - Returned connection 1182320432 to pool.