MyBatis learning summary (six) - calling stored procedures

 

First, put forward the demand

　　Query to get the number of males or females, if the input is 0, it is female, otherwise it is male

Second, prepare database tables and stored procedures

 1 create table p_user(  
 2     id int primary key auto_increment,  
 3     name varchar(10),
 4     sex char(2)
 5 ); 
 6 
 7 insert into p_user(name,sex) values('A',"男");  
 8 insert into p_user(name,sex) values('B',"女");  
 9 insert intop_user(name,sex) values ​​( ' C ' ,"male");  
 10  
11  -- create a stored procedure (query to get the number of males or females, if 0 is passed in females otherwise males) 
12  DELIMITER $
 13  CREATE  PROCEDURE mybatis.ges_user_count( IN sex_id INT , OUT user_count INT )
 14  BEGIN   
15  IF sex_id = 0  THEN 
16  SELECT  COUNT ( * ) FROM mybatis.p_user WHERE p_user.sex = ' female '  INTO user_count;
17 ELSE
18 SELECT COUNT(*) FROM mybatis.p_user WHERE p_user.sex='男' INTO user_count;
19 END IF;
20 END 
21 $
22 
23 -- 调用存储过程
24 DELIMITER ;
25 SET @user_count = 0;
26 CALL mybatis.ges_user_count(1, @user_count);
27 SELECT @user_count;

3. Edit userMapper.xml

　　编辑userMapper.xml文件，添加如下的配置项

 1 <!-- 
 2         查询得到男性或女性的数量, 如果传入的是0就女性否则是男性
 3      -->
 4     <select id="getUserCount" parameterMap="getUserCountMap" statementType="CALLABLE">
 5         CALL mybatis.ges_user_count(?,?)
 6     </select>
 7     
 8     <!--
 9         parameterMap.put("sexid", 0);
10         parameterMap.put("usercount", -1);
11      -->
12     <parameterMap type="java.util.Map" id="getUserCountMap">
13         <parameter property="sexid" mode="IN" jdbcType="INTEGER"/>
14         <parameter property="usercount" mode="OUT" jdbcType="INTEGER"/>
15     </parameterMap>

四、编写单元测试代码

 1 package me.gacl.test;
 2 
 3 import java.util.HashMap;
 4 import java.util.List;
 5 import java.util.Map;
 6 
 7 import me.gacl.custom.model.ConditionUser;
 8 import me.gacl.domain.User;
 9 import me.gacl.util.MyBatisUtil;
10 import org.apache.ibatis.session.SqlSession;
11 import org.junit.Test;
12 
13 /**
14  * @author gacl
15  * 测试调用存储过程
16  */
17 public class Test6 {
18     
19     @Test
20     public void testGetUserCount(){
21         SqlSession sqlSession = MyBatisUtil.getSqlSession();
22         /**
23          * 映射sql的标识字符串，
24          * me.gacl.mapping.userMapper是userMapper.xml文件中mapper标签的namespace属性的值，
25          * getUserCount是select标签的id属性值，通过select标签的id属性值就可以找到要执行的SQL
26          */
27         String statement = "me.gacl.mapping.userMapper.getUserCount";//映射sql的标识字符串
28         Map<String, Integer> parameterMap = new HashMap<String, Integer>();
29         parameterMap.put("sexid", 1);
30         parameterMap.put("usercount", -1);
31         sqlSession.selectOne(statement, parameterMap);
32         Integer result = parameterMap.get("usercount");
33         System.out.println(result);
34         sqlSession.close();
35     }
36 }