Sql server 从@DatabaseName中选择

我需要一个数据库变量，因为从中访问数据的表将位于各种数据库中，例如dBase1、dBase2等。我不能使用Select。。。在字符串中，因为我想将Select语句用于游标，这似乎不允许使用字符串和exec命令。这里有一个不起作用的例子。任何建议都将不胜感激

DECLARE @fromDBase varchar(10), @FundCD char(4), @actID INT, 
    @PortCode char(4), @FundDecm INT, @PlanCd char(6)
set @FundCD  = 'F0XX'
set @actID = 11135408   
set @PortCode = 'P001'
set @FundDecm = 3
set @PlanCd = 'XXX001'
DECLARE csFin cursor STATIC LOCAL for
SELECT PortionCode, CashValue, UnitValue, CostValue, UniqueID
from (SELECT DatabaseName FROM [dBase1].[dbo].mPTLDetail WHERE plancode = @PlanCd)
WHERE AccountID = @actID 
    AND FundCode = @FundCd 
    AND UnitValue != 0
    AND (Cast(Str(UnitValue, 12, @FundDecm) as money) - UnitValue) != 0

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我认为您需要构建一个动态语句并调用exec sp_executesql来执行它。 不确定这会如何影响光标，但我不太熟悉它们

DECLARE @fromDBase varchar(10), @FundCD char(4), @actID INT, 
    @PortCode char(4), @FundDecm INT, @PlanCd char(6), 
    @sqlstatement nvarchar(4000)
set @FundCD  = 'F0XX'
set @actID = 11135408   
set @PortCode = 'P001'
set @FundDecm = 3
set @PlanCd = 'XXX001'

SELECT @fromDBase = DatabaseName FROM [dBase1].[dbo].mPTLDetail WHERE plancode = @PlanCd

set @sqlstatement = 'DECLARE csFin cursor STATIC LOCAL for SELECT PortionCode, CashValue,
UnitValue, CostValue, UniqueID from' + @fromDBase + 'WHERE AccountID = ' + @actID + ' AND     
FundCode = ' + @FundCd + ' AND UnitValue != 0 AND (Cast(Str(UnitValue, 12, ' + @FundDecm  
+') as money) - UnitValue) != 0'

exec sp_executesql @sqlstatement

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游标可以通过与

sp\u executesql

一起使用游标变量动态分配

CREATE PROCEDURE GetData
    @FundCD char(4), @actID int, @PortCode char(4), @FundDecm int,
    @PlanCd char(6)
AS

DECLARE @fromDBase varchar(10), @query nvarchar(max), @cursor cursor

SET @fromDBase =
(
    SELECT DatabaseName
    FROM [dBase1].[dbo].mPTLDetail
    WHERE plancode = @PlanCd
)

SET @query = N'
    SET @cursor = CURSOR FOR
        SELECT PortionCode, CashValue, UnitValue, CostValue, UniqueID
        FROM ' + QUOTENAME(@fromDBase) + '.[dbo].[Table1]
        WHERE AccountID = @actID
            AND FundCode = @FundCd
            AND UnitValue != 0
            AND (Cast(Str(UnitValue, 12, @FundDecm) as money) - UnitValue) != 0;

    OPEN @cursor;'

EXEC sp_executesql @query,
    N'@FundCD char(4), @actID int, @FundDecm int, @cursor cursor out',
    @FundCD, @actID, @FundDecm, @cursor out

FETCH NEXT FROM @cursor

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不过，这可能会有所帮助。SQL注入可能会产生不良后果。