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http://tracker.firebirdsql.org/browse/DNET-124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jiri Cincura reopened DNET-124:
-------------------------------
Reopened for better fix.
> Long VARCHAR parameters in where clause reported as "string truncation"
> -----------------------------------------------------------------------
>
> Key: DNET-124
> URL: http://tracker.firebirdsql.org/browse/DNET-124
> Project: .NET Data provider
> Issue Type: Bug
> Components: ADO.NET Provider
> Affects Versions: 2.0.1
> Environment: WIndows XP, firebird engine 2.01, visual studio 2005
> Reporter: St?phane Claret
> Assignee: Jiri Cincura
> Priority: Critical
> Fix For: 2.5.0 Beta 1
>
>
> Hello,
> Let's consider this simple table :
> -------------------------------------------
> CREATE TABLE DEVISE (
> CODE_DEVISE Char(3) NOT NULL COLLATE ES_ES_CI_AI,
> NOM_DEVISE Varchar(20) NOT NULL COLLATE ES_ES_CI_AI,
> CONSTRAINT PK_DEVISE PRIMARY KEY (CODE_DEVISE)
> );
> INSERT INTO DEVISE (code_devise, nom_devise) VALUES (chg, "test");
> -------------------------------------------
> Now if you try to execute the following code in a c# program
> --------------------------------------------
> FbCommand fb = conex.CreateCommand();
> fb.CommandText = "SELECT * FROM DEVISE WHERE DEVISE.CODE_DEVISE LIKE
> 'chg%'";
> FbDataReader reader = fb.ExecuteReader();
> reader.Read();
> --------------------------------------------
> It works perfectly, (1 row returned )
> But now, if you try to execute the same sql statement but by using a
> parameter in the WHERE Clause instead of a constant value :
> --------------------------------------------
> FbCommand fb = conex.CreateCommand();
> fb.CommandText = "SELECT * FROM DEVISE WHERE DEVISE.CODE_DEVISE LIKE
> @devise1";
> fb.Parameters.Add("@devise1", "chg%");
> FbDataReader reader = fb.ExecuteReader();
> reader.Read();
> --------------------------------------------
> fb.ExecuteReader raises a numeric overflow / String truncation exception,
> most probably because the length of "chg%" (4 chars) exceeds the size of the
> code_devise column ( CHAR(3) ).
> I think that the lenght of string parameters should not be so strictly
> enforced when they are used in a WHERE clause because it produces unwanted
> behavior and prevent execution of statements which are actually correct.
> Regards
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