free qr code generator in vb.net Inside Microsoft SQL Server 2008: T-SQL Programming in VS .NET

Drawing QR Code ISO/IEC18004 in VS .NET Inside Microsoft SQL Server 2008: T-SQL Programming

Inside Microsoft SQL Server 2008: T-SQL Programming
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If you invoke proc2 alone, the code has no reason to fail because no other #T1 table exists in the session and it doesn t fail:
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EXEC dbo.proc2;
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You get an output with the row loaded to proc2 s #T1:
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col1 col2 ----------- ----------2 2
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The execution plan for proc2 now resides in cache . Ironically, if you now run proc1 again, the code will complete without errors . proc2 will not go through a resolution process again (neither will it go through parsing or optimization); rather, SQL Server simply reuses the plan from cache:
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EXEC dbo.proc1;
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And now you get the output you probably expected to begin with:
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col1 ----------1 col1 col2 ----------- ----------2 2
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However, if proc2 s plan is removed from cache and you run proc1, your code will break:
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EXEC sp_recompile 'dbo.proc2'; EXEC dbo.proc1;
This generates the following output:
Object 'dbo.proc2' was successfully marked for recompilation. col1 ----------1 Msg 213, Level 16, State 1, Procedure proc2, Line 5 Column name or number of supplied values does not match table definition.
In short, I hope that you realize it s wise to avoid naming temporary tables the same in different stored procedures/levels . A way to avoid such issues is to add a unique proc identifier to the names of temporary tables . For example, you could name the temporary table in proc1 #T1_proc1, and in proc2 name the temporary table #T1_proc2 . When you re done, run the following code for cleanup:
IF OBJECT_ID('dbo.proc1', 'P') IS NOT NULL DROP PROC dbo.proc1; IF OBJECT_ID('dbo.proc2', 'P') IS NOT NULL DROP PROC dbo.proc2;
7 Temporary Tables and Table Variables
Schema Changes to Temporary Tables in Dynamic Batches
Remember that a local temporary table created in a certain level is not visible to outer levels in the call stack . Occasionally, programmers look for ways around this limitation, especially when working with dynamic execution . That is, you want to construct the schema of the temporary table dynamically and populate it based on some user input, and then access it from an outer level . Frankly, insisting on using local temporary tables in such a scenario is very problematic . The solution involves ugly code, as is the nature of dynamic SQL in general, plus recompilations resulting from schema changes and data modifications . You should consider other alternatives to provide for the original need . Still, I want to show you a way around the limitations . Here s an initial algorithm that attempts to provide a solution for this request: 1. In the outer level, create temporary table #T with a single dummy column . 2. Within a dynamic batch, perform the following tasks: a. Alter #T, adding the columns you need . b. Alter #T, dropping the dummy column . c. Populate #T . 3. Back in the outer level, access #T in a new batch . The problem with this algorithm lies in the last item within the dynamic batch . References to #T will be resolved against the outer #T s schema . Remember that when the batch is resolved, #T s new schema is not available yet . The solution is to populate #T within another dynamic batch, in a level inner to the dynamic batch that alters #T s schema . You do this by performing the following tasks: 1. In the outer level, create temporary table #T with a single dummy column . 2. Within a dynamic batch, perform the following tasks: a. Alter #T, adding the columns you need . b. Alter #T, dropping the dummy column . c. Open another level of dynamic execution and within it populate #T . 3. Back in the outer level, access #T in a new batch . Here s some sample code that implements this algorithm:
-- Assume @column_defs and @insert were constructed dynamically -- with appropriate safeguards against SQL injection DECLARE @column_defs AS VARCHAR(1000), @insert AS VARCHAR(1000); SET @column_defs = 'col1 INT, col2 DECIMAL(10, 2)'; SET @insert = 'INSERT INTO #T VALUES(10, 20.30)';
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