Question

这是一个相当简单的错误，但我无法弄清楚为什么我会得到它。我在声明（TABLE_NAME）中选择了一列，并且正在获取一个变量（@cTableName）。是什么给了什么？

CREATE PROCEDURE [dbo].[updateNumbers_ArchiveDB]
(
 @accountNumber varchar(50),
 @padding varchar(50),
 @proc_dateStart datetime,
 @proc_dateEnd datetime
 )
 AS

 DECLARE @cTableName varchar(50)

    DECLARE CursorYearlyTables CURSOR FOR
    SELECT  TABLE_NAME
    FROM  INFORMATION_SCHEMA.TABLES
    WHERE TABLE_NAME like 'Archive[12]%' and len(TABLE_NAME) = 14
    ORDER BY TABLE_NAME;

-- =============================================
-- Open the cursor and iterate over the monthlies
-- =============================================
OPEN CursorYearlyTables 
fetch next from CursorYearlyTables into @cTableName
while (@@fetch_status <> -1)

 BEGIN
 SET NOCOUNT ON; 

declare @q varchar(1000);

set @q = 'Update' + @cTableName +
         'SET LogicalAccount = @padding + @accountNumber' +
         'WHERE ProcessDate BETWEEN CAST(@proc_dateStart AS DATE) AND CAST(@proc_dateEnd AS DATE)'
exec(@q)

fetch next from CursorYearlyTables into @cTableName

END

close CursorYearlyTables;
DEALLOCATE CursorYearlyTables;

Answer 1

你可以用光标

中的这些行来试试吗？

declare @q nvarchar(max);

set @q = 'Update ' + @cTableName +
         'SET LogicalAccount = '+@padding + @accountNumber +
         'WHERE ProcessDate BETWEEN CAST('''+CONVERT(VARCHAR(20),@proc_dateStart)+''' AS DATE) AND CAST('''+CONVERT(VARCHAR(20),@proc_dateEnd)+''' AS DATE)'

exec sp_executesql @q

考虑到SQL_Injection，DavidG评论说：

declare 
    @q nvarchar(max) = 'update '+@cTableName+' SET LogicalAccount = @a where ProcessDate BETWEEN CAST(@b AS DATE) AND CAST(@c AS DATE))',
    @param1 nvarchar(100) = @padding+ @accountNumber,
    @ParamDefinition nvarchar(500) = N'@a varchar(100), @b datetime, @c datetime'

exec sp_executesql @q, @ParamDefinition,@a = @param1,@b = @proc_dateStart, @cTableName = @proc_dateEnd

Answer 2

请使用CONVERT功能

  CAST('''+CONVERT(VARCHAR(108),@proc_dateStart)+''' AS DATE) AND CAST('''+CONVERT(VARCHAR(108),@proc_dateEnd)+''' AS DATE)'

在INTO列表中声明的变量数必须与选择一列的选定列的变量数相匹配

2 个答案: