Error Handling In T-sql Function
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posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow sql begin catch Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error Handling in T-SQL Scalar Function up vote https://technet.microsoft.com/en-us/library/ms179495(v=sql.105).aspx 3 down vote favorite This question could easily take multiple paths, so I will hit the more specific path first. While working with SQL Server 2005, I'm trying to create a scalar function that acts as a 'TryCast' from varchar to int. Where I encounter a problem is when I add a TRY block in the function; CREATE FUNCTION u_TryCastInt ( @Value as VARCHAR(MAX) ) RETURNS Int AS http://stackoverflow.com/questions/2922712/error-handling-in-t-sql-scalar-function BEGIN DECLARE @Output AS Int BEGIN TRY SET @Output = CONVERT(Int, @Value) END TRY BEGIN CATCH SET @Output = 0 END CATCH RETURN @Output END Turns out theres all sorts of things wrong with this statement including "Invalid use of side-effecting or time-dependent operator in 'BEGIN TRY' within a function" and "Invalid use of side-effecting or time-dependent operator in 'END TRY' within a function". I can't seem to find any examples of using try statements within a scalar function, which got me thinking, is error handling in a function is possible? The goal here is to make a robust version of the Convert or Cast functions to allow a SELECT statement carry through depsite conversion errors. For example, take the following; CREATE TABLE tblTest ( f1 VARCHAR(50) ) GO INSERT INTO tblTest(f1) VALUES('1') INSERT INTO tblTest(f1) VALUES('2') INSERT INTO tblTest(f1) VALUES('3') INSERT INTO tblTest(f1) VALUES('f') INSERT INTO tblTest(f1) VALUES('5') INSERT INTO tblTest(f1) VALUES('1.1') SELECT CONVERT(int,f1) AS f1_num FROM tblTest DROP TABLE tblTest It never reaches point of dropping the table because the execution gets hung on trying to convert 'f' to an integer. I want to be able to do something like this; SELECT u_TryCastInt(f1) AS f1_num FROM tblTest fi_
Recent PostsRecent Posts Popular TopicsPopular Topics Home Search Members Calendar Who's On Home » SQL Server http://www.sqlservercentral.com/Forums/Topic524905-149-1.aspx 2005 » SQL Server 2005 General Discussion » How to use the https://www.dbbest.com/blog/exception-sql-server-udf/ try catch block in Function? How to use the try catch block in Function? Rate Topic Display Mode Topic Options Author Message Swamy MagamSwamy Magam Posted Friday, June 27, 2008 6:11 AM SSC Journeyman Group: General Forum Members Last Login: Friday, January 15, 2010 5:07 AM Points: 82, error handling Visits: 129 HiI am trying write a function in that function i am use the try catch block, when i am complie that function it is the throwing complie error.my functioncreate function GetEmployeeid(@Deptno varchar(Max))returns varchar(Max)asBeginDeclare @employeeid Varchar(Max)BEGIN TRYSelect top 1 Employeeid from temployee where deptno=@deptnoEnd Try BEGIN Catch print 'geting errror'End Catchreturn(@employeeid )EndComplie Error Is:Msg 443, Level 16, State 14, Procedure sql error handling GetEmployeeid, Line 7Invalid use of side-effecting or time-dependent operator in 'BEGIN TRY' within a function.Msg 444, Level 16, State 2, Procedure GetEmployeeid, Line 8Select statements included within a function cannot return data to a client.Msg 443, Level 16, State 14, Procedure GetEmployeeid, Line 9Invalid use of side-effecting or time-dependent operator in 'END TRY' within a function.Msg 443, Level 16, State 14, Procedure GetEmployeeid, Line 10Invalid use of side-effecting or time-dependent operator in 'BEGIN CATCH' within a function.Msg 443, Level 16, State 14, Procedure GetEmployeeid, Line 11Invalid use of side-effecting or time-dependent operator in 'PRINT' within a function.Msg 443, Level 16, State 14, Procedure GetEmployeeid, Line 12Invalid use of side-effecting or time-dependent operator in 'END CATCH' within a function.Thanks In Advance Please help me. RegardsSwamy. Post #524905 Andrew Gothard-467944Andrew Gothard-467944 Posted Friday, June 27, 2008 7:13 AM SSC-Enthusiastic Group: General Forum Members Last Login: Wednesday, September 29, 2010 5:23 AM Points: 194, Visits: 2,357 Afraid you can't use TRY - CATCH in a T-SQL UDF. Post #524957 Swamy MagamSwamy Magam Posted Friday, June 27, 2008 7:22 AM SSC Journeyman Group: Genera
Big Data, Mobile Apps, Web and Software Development How to Raise an Exception in SQL Server User Defined Functions Posted by Yan Roginevich | On July 2nd, 2012 | In Database Migration There are a lot of differences between Oracle and MS SQL Server and you will face many of them trying to move your database from one platform to another. If you use SSMA, which is a good thing to do, you can avoid huge amount of manual work, but you will have to solve some specific problems by yourself after SSMA job will be done. One of them can be raising errors from UDF, which you can easily do in Oracle and can’t in SQL Server without some workarounds because of T-SQL limitations for UDF. So let’s create some pretty simple UDF in Oracle and take a look on how we can keep its full functionality in MS SQL. Oracle: 12345678CREATE OR REPLACE FUNCTION DIVIDE (a int, b int) RETURN NUMBER IS BEGIN IF (b=0) THEN RAISE_APPLICATION_ERROR(-20002, 'You cannot divide by zero!'); END IF; RETURN a/b; END DIVIDE; If you try to rewrite it in T-SQL just with obvious syntax and data types changes like that: 1234567CREATE FUNCTION DIVIDE (@a int, @b int) RETURNS float(53) BEGIN IF (@b = 0) RAISERROR(59998, 16, 1, 'You cannot divide by zero!') RETURN CAST(@a AS float(53)) / @b END you will get an error: Msg 443, Level 16, State 14, Procedure DIVIDE, Line 5 Invalid use of a side-effecting operator ‘RAISERROR' within a function. Let’s see what SSMA does to avoid this (and many other) T-SQL restrictions for UDF. If you are new to SSMA you can start with this presentation by our CEO Dmitry Balin, which describes the main idea of migration process. It also should be enough to make first steps with SSMA. So, first of all SSMA creates “sysdb” database with collection of auxiliary objects (like tables, SPs, UDFs etc). Part of them is just emulating Oracle build-in functionality and the other helps to deal with more complicated situations. You can’t raise errors from UDF, but you can do that from a stored procedure, so SSMA creates one: 123456789101112131415161718192021222324252627282930CREATE PROCEDURE [dbo].[DIVIDE$IMPL] @a int, @b int, /* * SSMA warning messages: * O2SS0356: Conversion from NUMBER datatype can cause data loss. */ @return_value_argument float(53) OUTPUT AS /*Generated by SQL Server Migration Assistant for