Mybatis增删改查mapper文件写法详解

 
  INSERT sql命令(命令里通过#{}获取对象属性)
  
 

 
  INSERT INTO PRAC_PERSON(p_NAME,P_PASSWORD) VALUES(#{name},#{password})
 

 SELECT 表里字段名 AS 结果字段名 FROM 表名 WHERE 条件
 

 
 
 
 
   SELECT * FROM PRAC_ADDRESS LEFT JOIN PRAC_PERSON ON A_PERSON=#{personId} AND PRAC_ADDRESS.A_PERSON=PRAC_PERSON.P_ID
 

 
  UPDATE PRAC_PERSON SET P_NAME=#{name},P_PASSWORD=#{password} WHERE P_ID=#{id}
  

  DELETE FROM PRAC_PERSON WHERE P_ID=#{id}

<?xml version="1.0" encoding="UTF-8"?>




INSERT INTO COMMODITY_CATEGORY_MANAGER (

) VALUES (

)


UPDATE COMMODITY_CATEGORY_MANAGER 




DELETE FROM COMMODITY_CATEGORY_MANAGER 


SELECT * FROM COMMODITY_CATEGORY_MANAGER 


SELECT CATEGORY_ID, USER_ID FROM COMMODITY_CATEGORY_MANAGER 


SELECT count(*) FROM COMMODITY_CATEGORY_MANAGER 
 

CATEGORY_ID
,USER_ID


#{categoryId}
,#{userId}




,CATEGORY_ID=#{categoryId}
,USER_ID=#{userId}





 
AND CATEGORY_ID=#{categoryId}
AND USER_ID=#{userId}