InstantForum.NET v2.9.0SQLServerCentralhttp://www.sqlservercentral.com/Forums/notifications@sqlservercentral.comSun, 19 May 2013 06:33:41 GMT20http://www.sqlservercentral.com/Forums/Topic1233252-338-1.aspx[quote][b]Cadavre (1/11/2012)[/b][hr]In this case, you'd have to use a CLR as you can't execute a string in a function. If you need help writing one (and someone else doesn't post one in between), I'll knock up a simple one later on today.[/quote]Well, running a little late obviously :-DNice and simple CLR, I've not exactly thoroughly tested this so you'll want to do lots of tests first.[code="vb"]using System;using System.Data;using System.Data.SqlTypes;using Microsoft.SqlServer.Server;namespace executeString{ public class UserDefinedFunctions { [SqlFunction] public static SqlString ExecuteString(SqlString maths) { var mathString = maths.ToString().Replace(" ", ""); string mathResult; try { var result = new DataTable().Compute(mathString, null); mathResult = result.ToString(); } catch (Exception) { mathResult = null; } mathResult = string.IsNullOrEmpty(mathResult) ? null : mathResult; return new SqlString(mathResult); } };}[/code][code="sql"]BEGIN TRANIF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[ExecuteString]') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT'))DROP FUNCTION [dbo].[ExecuteString]IF EXISTS (SELECT * FROM sys.assemblies asms WHERE asms.name = N'executeString' and is_user_defined = 1)DROP ASSEMBLY [executeString]GOCREATE ASSEMBLY [executeString]AUTHORIZATION [dbo]FROM 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PERMISSION_SET = SAFEGOCREATE FUNCTION [dbo].[ExecuteString](@maths [nvarchar](4000))RETURNS [nvarchar](4000) WITH EXECUTE AS CALLERAS EXTERNAL NAME [executeString].[executeString.UserDefinedFunctions].[ExecuteString]GOCREATE TABLE yourTable (yourTableID INT IDENTITY, column1 VARCHAR(500), column2 VARCHAR(500))INSERT INTO yourTable (column1)SELECT '2 * 2+1 * 7'UNION ALL SELECT '1 * 1+2 * 4'UNION ALL SELECT '1 * 1+2 * 4+1 * 4'SELECT column1, [dbo].[ExecuteString] (column1)FROM yourTableROLLBACK[/code]Which will return: -[code="plain"]column1 ------------------- --------------------2 * 2+1 * 7 111 * 1+2 * 4 91 * 1+2 * 4+1 * 4 13[/code]Since you never replied to my last message, I'm assuming that a CLR is an option for you?Thu, 12 Jan 2012 03:03:34 GMTCadavrehttp://www.sqlservercentral.com/Forums/Topic1233252-338-1.aspx[quote][b]kausmail (1/10/2012)[/b][hr]This is working but I am looking soothing like a scaler function that can be used in Select statement. Any idea?select ..., dbo.fnExpressionToValue(Expr) from myTable[/quote]That's a different requirement to the one you originally stated.In this case, you'd have to use a CLR as you can't execute a string in a function. If you need help writing one (and someone else doesn't post one in between), I'll knock up a simple one later on today.Wed, 11 Jan 2012 02:19:53 GMTCadavrehttp://www.sqlservercentral.com/Forums/Topic1233252-338-1.aspxThis is working but I am looking soothing like a scaler function that can be used in Select statement. Any idea?select ..., dbo.fnExpressionToValue(Expr) from myTableTue, 10 Jan 2012 11:31:51 GMTkausmailhttp://www.sqlservercentral.com/Forums/Topic1233252-338-1.aspxNice!Tue, 10 Jan 2012 08:24:41 GMTPhil Parkinhttp://www.sqlservercentral.com/Forums/Topic1233252-338-1.aspx[code="sql"]BEGIN TRANCREATE TABLE yourTable (yourTableID INT IDENTITY, column1 VARCHAR(500), column2 VARCHAR(500))INSERT INTO yourTable (column1)SELECT '2 * 2+1 * 7'UNION ALL SELECT '1 * 1+2 * 4'UNION ALL SELECT '1 * 1+2 * 4+1 * 4'DECLARE @SQL AS VARCHAR(MAX)SELECT @SQL = COALESCE(@SQL + ';' + CHAR(10),'') + 'UPDATE yourTable SET column2= ' + column1 + ' WHERE yourTableID = '+CAST(yourTableID AS VARCHAR(3))FROM yourTablePRINT @SQLEXEC(@SQL)--Check resultsSELECT * FROM yourTableROLLBACK[/code]Tue, 10 Jan 2012 08:17:06 GMTCadavrehttp://www.sqlservercentral.com/Forums/Topic1233252-338-1.aspxWhat about operator precedence? If it needs to be calculated from left to right, it would be easy with string operations. Operator precedence will make it little complicated.Please provide us DDL, sample data to play with. Tue, 10 Jan 2012 08:12:25 GMTDevhttp://www.sqlservercentral.com/Forums/Topic1233252-338-1.aspxHi All,I have a very interesting situation. I am pulling following string (see Coulmn1) using substring,replace..etc. from the varchar(5000). I want to execute it as a mathematical expression and want the result shown in Column2.Column1 --------------- Coulmn22 * 2+1 * 7 --------------- 111 * 1+2 * 4 --------------- 91 * 1+2 * 4+1 * 4 --------- 13Tue, 10 Jan 2012 08:05:21 GMTkausmail