sqlserver存储过程实现数据批量删除--分割字符串实现

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写的存储过程，接收的参数的一个字符串，通过分割字符串从而实现批量删除。

IF (@operation = 'delete')
      BEGIN
		DECLARE @temp nvarchar(200)
		DECLARE @splitchar nvarchar(1)
		SET @splitchar=','
		SET @userId=@userId+@splitchar
		WHILE CHARINDEX(@splitchar,@userId)>0
		BEGIN
			SET @temp=SUBSTRING(@userId,1,CHARINDEX(@splitchar,@userId)-1)
			IF(LEN(@temp)>0)
			BEGIN
				PRINT(@temp)
				DELETE from TB_user WHERE user_id =@temp;
			END
			SET @userId=RIGHT(@userId,LEN(@userId)-CHARINDEX(@splitchar,@userId))
			PRINT(@userId)
		END
      END

用到的函数有：CHARINDEX();LEN();RIGHT();SUBSTRING（）
charindex(expression1 , expression2 )表示：
从expression2字符串中指定的位置处开始查找是否包含expression1字符串。如果能够从expression2字符串中查找到expression1字符串则返回expression1在
expression2出现的位置；反之，返回0

LEN(expression1 )表示：返回expression1 的长度；

RIGHT(expression,number）表示：从expression右边开始，返回长度为number的字符串。

SUBSTRING(expression, start, length)表示：返回从expression的start位置开始截取长度为length 的字符串。

附上完整的存储过程，是用的操作的，包含增加用户，修改用户，批量删除用户。
文件：sp_query_掌上微课_用户操作.sql

USE [ZSWK]
GO
/****** Object:  StoredProcedure [dbo].[sp_query_掌上微课_用户操作]    Script Date: 12/05/2018 11:10:18 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

-- exec sp_query_掌上微课_用户操作 'insert','','20181204测试','123456','','测试001','男','','','1','','','123',''
-- exec sp_query_掌上微课_用户操作 'update','10','test001','','','','','','null','','','','',''
-- exec sp_query_掌上微课_用户操作 'delete','11','null','null','null','null','null','null','null','null','null','null','null','null' 
ALTER PROC [dbo].[sp_query_掌上微课_用户操作]
    @operation varchar(255),
    @userId  varchar(255),
    @userName  varchar(255),
    @password  varchar(255),
    @phone varchar(255),
    @fullname varchar(255),
    @sex varchar(255),
    @area varchar(255),
    @createAt varchar(255),
    @isTeacher varchar(255),
    @teacherInfo varchar(4000),
    @icon varchar(4000),
    @empNumber varchar(255),
    @userAccount varchar(255)
AS
  BEGIN

    SET NOCOUNT ON


    IF (@operation = 'insert')
      BEGIN
        INSERT INTO TB_user(user_name,password,fullname,phone,sex,area,create_at,isTeacher,teacher_info,icon,empNumber,userAccount)
        VALUES (@userName,@password, @fullname, @phone,@sex,@area,@createAt,@isTeacher,@teacherInfo,@icon,@empNumber,@userAccount)
      END

    IF (@operation = 'delete')
      BEGIN
		DECLARE @temp nvarchar(200)
		DECLARE @splitchar nvarchar(1)
		SET @splitchar=','
		SET @userId=@userId+@splitchar
		WHILE CHARINDEX(@splitchar,@userId)>0
		BEGIN
			SET @temp=SUBSTRING(@userId,1,CHARINDEX(@splitchar,@userId)-1)
			IF(LEN(@temp)>0)
			BEGIN
				PRINT(@temp)
				DELETE from TB_user WHERE user_id =@temp;
			END
			SET @userId=RIGHT(@userId,LEN(@userId)-CHARINDEX(@splitchar,@userId))
			PRINT(@userId)
		END
      END

    IF (@operation = 'update')
      BEGIN
        DECLARE @sql VARCHAR(5000)
        DECLARE @whereSql VARCHAR(5000)
        SET @sql = 'UPDATE TB_user SET'
        SET @whereSql = ''
        IF ( @userName !='NULL' and @userName != '')
          BEGIN
            SET @whereSql =@whereSql+ ' user_name = '+''''+@userName+''''+','
          END

		IF ( @password !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' password = '+''''+@password+''''+','
          END
        
        IF ( @phone !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' phone = '+''''+@phone+''''+','
          END
        
        IF ( @fullname !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' fullname = '+''''+@fullname+''''+','
          END
        
        IF ( @sex !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' sex = '+''''+@sex+''''+','
          END
        
        IF ( @area !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' area = '+''''+@area+''''+','
          END
        
        IF ( @createAt !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' create_at = '+''''+@createAt+''''+','
          END
        
        IF ( @isTeacher !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' isTeacher = '+''''+@isTeacher+''''+','
          END
        
        IF ( @teacherInfo !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' teacher_info = '+''''+@teacherInfo+''''+','
          END
        
        IF ( @icon !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' icon = '+''''+@icon+''''+','
          END
        
        IF ( @empNumber !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' empNumber = '+''''+@empNumber+''''+','
          END
        
        IF ( @userAccount !='NULL')
          BEGIN
            SET @whereSql =@whereSql+ ' userAccount = '+''''+@userAccount+''''+','
          END
        
      SET  @sql = @sql+@whereSql
        IF ( charindex(',',@sql) > 0)
          BEGIN
            PRINT @sql
            SET @sql = SUBSTRING(@sql,0,(LEN(@sql)) )
            SET @sql = @sql + ' WHERE user_id = '+ @userId
            PRINT @sql
            EXEC (@sql)
          END
        ELSE
          BEGIN
            RETURN
          END
      END

  END