The wrong data type on bind variable
We are testing framework entity with ODP.NET and linq to entities and have a little problem.We run a simple linq to entities statement with a variable binding and our problem is that the column in the oracle database is the CHAR type framework but entity sends the binding as NVARCHAR2 variable. This causes the oracle do not use the index on the column and a full table scan is performed.
Entities are generated from the database.
LINQ:
public string Name (string value)
{
var object = (from s in ctx3. TABLE
where s.COLUMN1 is value
Select s.COLUMN2). ToList();
Returns the object [0]. ToString();
}
Is there a way to set the data type for a variable binding when you use linq?
Published by: 872217 on March 13, 2012 04:42
Because the .NET string is in Unicode, by default, NVARCHAR2 is used in the binding of parameter to string variables.
EntityFunctions.AsNonUnicode (of use) should be able to say ODP.NET you want to treat a non-Unicode string.
In this case, VARCHAR2 should be used for the link.
I hope this will save for you table scan when there is no conversion data more.
using System.Data.Objects;
public string Name (string value)
{
var object = (from s in ctx3. TABLE
where s.COLUMN1 is EntityFunctions.AsNonUnicode (value)
Select s.COLUMN2). ToList();
Returns the object [0]. ToString();
}
Please let me know if it works for you.
Tags: Database
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