Dynamic Sql Error Handling Sql Server
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for dynamic sql - please... 11 posts,Page 1 of 212»» Error handling for dynamic sql error handling in sql server 2008 stored procedure - please advise Rate Topic Display Mode Topic Options Author Message KoldCoffeeKoldCoffee Posted Thursday, June 16, 2011 5:19 PM Right there with error handling in sql server user-defined functions Babe Group: General Forum Members Last Login: Tuesday, May 12, 2015 11:03 PM Points: 789, Visits: 1,905 Please advise on some error handling techniques that I can research and that would be appropriate here.The below script working
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well for the task it is meant for: to rename a column currently called Big with IsBig, and to change the data type to bit. There is a condition that checks upfront for the possibility that there may or may not be a default constraint that needs to be dropped before the renaming. But it all works....UNLESS....anything I haven't conceived of happens. One of those things was finding out that one of the
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tables on my list actually had both a Big and and IsBig column, in which case this script didn't fail, just skirted around the table, kept processing other tables, and gave no error or exception.Where and with which constructs should I begin?---retrieves tables to changeUSE DatabaseNameGODECLARE @TableName varchar(max)DECLARE getTableName CURSOR FORselect ss.name + '.' + o.name as table_namefrom sys.objects ojoin sys.schemas ss on ss.schema_id = o.schema_id where type = 'u' andss.name + '.' + o.name in('mgo.tablename1','sbr.tablename2','dkl.tablename3'); OPEN getTableName FETCH NEXT FROM getTableName INTO @TableName WHILE @@FETCH_STATUS = 0 BEGIN declare @default varchar(max) declare @table_name varchar(max) set @table_name = @TableName set @default = null ---- identify if default constraint on Big column existsSELECT @default = d.namefrom sys.tables t join sys.default_constraints d on d.parent_object_id = t.object_id join sys.columns c on c.object_id = t.object_id and c.column_id = d.parent_column_idwhere t.name = SUBSTRING(@Table_Name,5,50)and c.name = 'Big'if @default is not nullBEGIN---- renames Big column to IsBig DECLARE @sql0 nvarchar(4000)SET @sql0 = 'sp_rename '''+ @Table_Name + '.Big'', ''IsBig'', ''COLUMN'''EXEC(@sql0)---- drops constraint on Big column if one existsDECLARE @sql1 nvarchar(4000)SET @sql1 = 'ALTER TABLE '+ @Table_Name + ' DROP ' + @default EXEC (@sql1)---- converts datatype from smallint to bit DECLARE @sql2 nvarchar(4000)SET @sql2 = 'ALTER TABLE ' + @Table_Name + ' ALTER COLUMN IsBig bit not null'EXEC(@sql2)---- readds default constraint, this time on renamed columnDECLARE @sql3
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how you should implement error handling when you write stored procedures, including when you call them from ADO. http://www.sommarskog.se/error-handling-II.html The other article, Error Handling in SQL Server - a Background, gives a deeper description of the idiosyncrasies with error handling in SQL Server and ADO. That article is in some sense part one in the series. However, you can read this article without reading the background article first, and if you are not a very error handling experienced user of SQL Server, I recommend you to start here. In places there are links to the background article, if you want more information about a certain issue. Note: this article is aimed at SQL2000 and earlier versions of SQL Server. SQL2005 offers significantly improved methods for error handling with TRY-CATCH. This article is not apt error handling sql if you are using SQL 2005 or later. I don't have a complete article on error handling for SQL 2005, but I have an unfinished article with a section Jumpstart Error Handling that still can be useful. Table of Contents: Introduction The Presumptions A General Example Checking Calls to Stored Procedures The Philosophy of Error Handling General Requirements Why Do We Check for Errors? When Should You Check @@error? ROLLBACK or not to ROLLBACK - That's the Question SET XACT_ABORT ON revisited Error Handling with Cursors Error Handling with Triggers Error Handling with User-Defined Functions Error Handling with Dynamic SQL Error Handling in Client Code What to Do in Case of an Error? Command Timeouts Why is My Error Not Raised? Getting the Return Value from a Stored Procedure Acknowledgements and Feedback Revision History Introduction Error handling in stored procedures is a very tedious task, because T-SQL offers no exception mechanism, or any On Error Goto. All you have is the global variable @@error which yo