用於計數動態表項的MS SQL存儲過程

Question

我在下面的存儲過程中寫了這個，並得到不正確的語句。

ALTER PROCEDURE dbo.[Counter] 
     @TableName VARCHAR(100) 
    AS 
     BEGIN 
      DECLARE @Counter INT 
      DECLARE @SQLQ VARCHAR(200) 
      SET NOCOUNT ON; 

     --SET @TableName = 'Member'; 
     SET @SQLQ = 'SELECT COUNT(*) FROM dbo.[' + @TableName + ']'; 
     --Preparing the above sql syntax into a new statement(get_counter). 

      --Getting an error here I had googled the prepare statement but don't know why facing this error. 
     PREPARE get_counter FROM @SQLQ; 
    @Counter = EXEC get_counter; -- here @resutl gets the value of the count.@TableName 
     DEALLOCATE PREPARE get_counter; -- removing the statement from the memory. 


    END 

然後我就寫了另一個問題：

ALTER PROCEDURE dbo.[Counter] 
    @TableName VARCHAR(100) 
AS 
    BEGIN 
     DECLARE @Counter INT 
     DECLARE @SQLQ VARCHAR(200) 
     SET NOCOUNT ON; 

     --SET @TableName = 'Member'; 
     SET @SQLQ = 'SELECT COUNT(*) FROM dbo.[' + @TableName + ']'; 
     --Preparing the above sql syntax into a new statement(get_counter). 


    Execute @SQLQ; -- here @resutl gets the value of the count.@TableName 

     --DEALLOCATE PREPARE get_counter; -- removing the statement from the memory. 
     Return @Counter; 

    END 

它運行良好，但我不能在櫃檯得到的結果，請人幫我（我知道，我還沒有分配任何價值的櫃檯，但如果我做我得到錯誤）。

你的答案馬丁後，我不得不現在你代替我的代碼的：

ALTER PROCEDURE dbo.[Counter] @SchemaName SYSNAME = 'dbo' , @TableName SYSNAME 

AS 
    BEGIN 
     SET NOCOUNT ON; 

     DECLARE @SQLQ NVARCHAR(1000) 
     DECLARE @Counter INT; 

     SET @SQLQ = 'SELECT @Counter = COUNT(*) FROM ' + 
     Quotename(@SchemaName) + '.' + Quotename(@TableName); 

     EXEC sp_executesql 
     @SQLQ , 
     N'@Counter INT OUTPUT', 
     @Counter = @Counter OUTPUT 

     Return SELECT @Counter 
    END 

現在我已經取回它。

ALTER PROCEDURE dbo.[CreateBusinessCode] 
    @MemberID        bigint, 
    @len          int, 
    @RewardAccountID    bigint, 
    @ConnectionStatusID   tinyint, 
    @Assign         smalldatetime 

AS 
    BEGIN 
    SET NOCOUNT ON; 
    DECLARE @counter INT 

    EXEC @counter = dbo.Counter 'dbo','member'; 

    Select @counter; 


    END 

Answer 1

您應該使用SYSNAME作爲對象標識符，Quotename而不是自己串聯方括號。

ALTER PROCEDURE dbo.[Counter] @TableName SYSNAME, 
           @SchemaName SYSNAME = 'dbo' 
AS 
    BEGIN 
     SET NOCOUNT ON; 

     DECLARE @SQLQ NVARCHAR(1000) 
     DECLARE @Counter INT; 

     SET @SQLQ = 'SELECT @Counter = COUNT(*) FROM ' + 
     Quotename(@SchemaName) + '.' + Quotename(@TableName); 

     EXEC sp_executesql 
     @SQLQ , 
     N'@Counter INT OUTPUT', 
     @Counter = @Counter OUTPUT 

     SELECT @Counter 
    END 

Answer 2

在SQL Server中，如果要將結果存入變量，您有兩種選擇。

第一個是使用遊標。

二是要做到動態SQL：

declare @sql varchar(max) = whatever; 
declare @cnt int; 

declare @cntTable table as (cnt int); 

insert into @cntTable 
    exec(@sql); 

select @cnt = t.cnt 
from @cntTable 

這是很麻煩的，但一個或其他不工作。

Answer 3

試試這個one.It犯規查詢的實際表，但會爲您提供計數的rows.This是更好的辦法，如果你有大的表，你需要大概計數。

ALTER PROCEDURE dbo.[Counter] 
    @TableName VARCHAR(100) 
AS 
begin 

declare @objectid int,@counter int 
select @objectid = object_id from sys.all_objects where name = @tablename and schema_id=SCHEMA_ID('dbo') 
select @counter = sum(rows) from sys.partitions where object_id= @objectid 
and index_id in (0,1) 
select @counter 
end 
go