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Posted 30 Mar 2009
Licenced CPOL

How To Run SQL Statement from LINQ

, 30 Mar 2009
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An article on how to run SQL statement from LINQ


Sometimes we need to run a SQL statement from LINQ. This article will show how to do this.

Using the Code

First you create a *.dbml file for mapping your database from 'Add New Item' in Visual Studio.NET 2008. As you know, a query in LINQ is different from a query in SQL. Here I create a method called GetMember which contains a SQL statement as a string which I need to execute from LINQ, and returns a list of members which make this method as datasource to grid view later.

I create this method for searching members by any parameter entered and with each other:

GeoDataContext MemberConnection = new GeoDataContext(); //connection
public List<Member> GetMemberSearchAll(string name, string fname, string MemberNo,
    string QualificationClass, string WorkClass, string GeoID)
    var sql = @"SELECT DISTINCT * FROM dbo.Member where MemberCode <> 0";
    if (name != "")
        sql = sql + " and (dbo.Member.MemberName like '%{0}%')";
    if (fname != "")
        sql = sql + "and (dbo.Member.MemberFameName like '%{1}%')";
    if (MemberNo != "")
        sql = sql + "and (dbo.Member.MemberNo = {2})";
    if (QualificationClass != "")
        sql = sql + " and (dbo.Member.QualificationClass = {3})";
    if (WorkClass != "")
        sql = sql + " and (dbo.Member.WorkClass = {4})";
    if (GeoID != "")
        sql = sql + "and (dbo.Member.GeoID ={5})";
    sql = string.Format(sql, name, fname, MemberNo, 
		QualificationClass, WorkClass, GeoID);
    var quary = MemberConnection.ExecuteQuery<Member>(sql);
    return quary.ToList();

Here I first formulate strings by both SQL statement and parameter by order, then I execute the method called ExecuteQuery from my connection which takes a parameter as a SQL query. Its summary in documentation of Visual Studio is "Executes SQL queries directly on the database and returns objects" then pass this SQL formatted to it.

Thanks, I hope this will help somebody.


  • 30th March, 2009: Initial post 


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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GeneralMy vote of 2 Pin
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memberMember 44820466-Apr-09 21:13 

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