映射文件xxxMapper.xml

接口中的每一个方法，都要在映射文件中有与之关联的SQL语句

增删改的返回值默认是int类型，不需要设置resultType，但是select必须要写返回值类型
方法的参数类型可以是基本数据类型、包装类型、对象类型、集合类型
映射文件中的节点：
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• 
  property是type对应类中的属性。column是通过查询得到的列，如果查询出来的列通过as改名了，那么一定要对应
  语句：
  增加：

  insert into user(id，name，password) values(#{uid},#{uname},#{pwd})

更改：

update user set age=#{uage}，name=#{uname}
where id=#{uid}

删除：

delete from user where id=#{uid}

各种查询：查询resultType是返回值类型，默认情况下返回的是个集合，所以只需要指明集合的类型即可

• 通过姓名模糊查询
  
  select id,name,password,gender,address
  from user
  where name like CONCAT(’%’,#{uname},’%’)
  在mapper文件中方法不能重载

    
    
    
    
    	
    	
    	 
    	 	insert into smbms_user(userCode,userName,userPassword)
    	 	values
    	 	(#{userCode},#{userName},#{userPassword})
    	 
    	 
    	 	update smbms_user set userCode=#{userCode},userName=#{userName} where id=#{id}
    	 
    	 
    	 	delete from smbms_user where id=#{id}
    	 
     
     
     
     
     
     
     	select count(id) from smbms_user
     
    
     
     	select id,userName,userCode from smbms_user
     
     
     	select id,userName,userCode 
     	from smbms_user
     	where 
     	userName like CONCAT('%',#{name},'%')
     
     
     	select id,userName,userCode,gender 
     	from smbms_user 
     	where 
     	userName like CONCAT('%',#{userName},'%') and gender = #{gender}
     
     
     
     	select id,userName,userCode 
     	from smbms_user 
     	where id = #{id}
     
     
     
     	select id,userName,userCode,gender
     	from smbms_user
     	where userName like CONCAT('%',#{name},'%')
     				   and gender = #{g}
     
     
     
     
     	select id,userName,userCode,gender
     		from smbms_user
     		where userName like CONCAT('%',#{uname},'%')
     						and gender=#{sex}
     
     
     
     
     
     	
     	 
     	 
     	 
     	 
     
     
     
     
     	select u.id as uid,userName,userCode,address,userRole,r.roleName
     	from smbms_user u
     	inner join smbms_role r on u.userRole=r.id
     	
     
     
     
     
     
     	
     	
     	
     
     
     
     	
     	
     	
     	
     	
     	
     
     
     	select u.id,userCode,userName,userRole,r.id as roleId,roleName,roleCode
     	from smbms_user u
     	inner join smbms_role r on u.userRole=r.id  
     
     
     
     
     
     	
     	
     	
     
     
     	
     	
     	
     	
     
     
     
     	select u.id as uid,userName,userCode,a.contact,a.addressDesc
     	from smbms_user u
     	left join smbms_address a on a.userId=u.id
     	where u.id=#{uid}