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Changing from "hard-coded" to dynamic query


Changing from "hard-coded" to dynamic query

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Sean Lange
Sean Lange
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Lynn Pettis (1/25/2013)
Sean Lange (1/25/2013)
Lynn Pettis (1/25/2013)

Sean,

@BatchID should have been @BranchID in the sp_executesql statement. That was a type.

Regarding @params = @Params, quite legal. From MSDN (emphasis is mine, and yes the names can be the same):

[quote]

sp_executesql [ @stmt = ] statement
[
{ , [ @params = ] N'@parameter_name data_type [ OUT | OUTPUT ][ ,...n ]' }
{ , [ @param1 = ] 'value1' [ ,...n ] }
]



Lynn,

I figured the Branch/Batch was a typo. After I posted I realized it was pretty much a direct copy from what you posted (typo included). The @params = @Params looked so strange to me I just assumed it wouldn't work.

The worst part of this is that not catching the typo is a clear indication that the OP does not have a good grasp of what is going on here. w00t

OP - you need to truly understand the code here before you use it. You are the one who has to support it when you get that call at 3am. I don't think your boss will be too impressed if you tell them you don't understand the code because you used what some person on the internet suggested.


Actually the OP did catch the typo regarding @BatchID/@BranchID.


Good grief!!! I wish it was morning so I could blame lack of coffee...I will blame it on the anticipation of getting a few beers after work today (being Friday).

/me creeps backwards from this one before I make even more of a fool out of myself. :-D

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This modification will make sure you include only actually existing tables and do not miss any of them:

declare @SQLCmd nvarchar(max), @Params nvarchar(max), @DiscDate datetime ;
SET @DiscDate = '20090630';
set @Params = N'@BranchID varchar(10), @DiscDate date';

select
@SQLCmd = ISNULL(@SQLCmd, 'select * from TableCurrent where branchid = @BranchID and (disc_dte is null or disc_dte > @DiscDate)')
+ char(13) + char(10) + 'UNION ALL ' + char(13) + char(10)
+ 'select * from ' + QUOTENAME(O.NAME ) + ' where branchid = @BranchID and (disc_dte is null or disc_dte > @DiscDate)'
-- SELECT *
FROM sys.objects AS O
WHERE O.type = 'U' AND O.name LIKE 'Table[_]20[0-1][0-9]%[_]20[01][0-9]'

print @SQLCmd;

exec sp_executesql @SQLCmd, @params = @Params, @BatchID = '950', @DiscDate = @DiscDate;



And if you want to avoid unnecessary scanning too far in the history you may add an extra condition into the WHERE clause.
It will include only those tables which can actually contain records from the date period you're interersted in:

declare @SQLCmd nvarchar(max), @Params nvarchar(max), @DiscDate datetime ;
SET @DiscDate = '20090630';
set @Params = N'@BranchID varchar(10), @DiscDate date';

select
@SQLCmd = ISNULL(@SQLCmd, 'select * from TableCurrent where branchid = @BranchID and (disc_dte is null or disc_dte > @DiscDate)')
+ char(13) + char(10) + 'UNION ALL ' + char(13) + char(10)
+ 'select * from ' + QUOTENAME(O.NAME ) + ' where branchid = @BranchID and (disc_dte is null or disc_dte > @DiscDate)'
-- SELECT *
FROM sys.objects AS O
WHERE O.type = 'U' AND O.name LIKE 'Table[_]20[0-1][0-9]%[_]20[01][0-9]'
AND O.name >= 'Table_' + CONVERT(nvarchar(128), YEAR(@DiscDate)-1)

print @SQLCmd;

exec sp_executesql @SQLCmd, @params = @Params, @BatchID = '950', @DiscDate = @DiscDate;


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