LINQ to SQL – Using ExecuteCommand() to Execute SQL Statements

LINQ to SQL – Using ExecuteCommand() to Execute SQL Statements

Before writing a LINQ to SQL query, we first need to create a DataContext using the LINQ to SQL Classes template, to know more on how to create the DataContext refer to the post LINQ to SQL Sample

Once the DataContext is created we can query the Object model using LINQ queries, let us consider the Employee table which has the following structure.

ExecuteCommand, can be used when we need to execute commands directly in the database. This method can be used to execute plain SQL statements directly on the database, we can execute the conventional SQL statements using this method. The syntax to use this method is as follows.

public int ExecuteCommand

(

            string sqlCommand,

            params Object[] Parameters

)

Assume we have the following data in the Employee and Department Tables

Table: Employee

ID	NAME	DOB	DOJ	DepartmentID	Salery
1	Tom	11/11/1967	05/01/2009	1	5000
2	Harry	10/07/1973	05/01/2009	2	6000
3	Peter	01/01/1982	01/01/2002	3	6500
4	John	05/04/1981	05/01/2009	3	7500
5	Charles	12/12/1973	05/01/2009	NULL	6500

Table: Department

ID	NAME
1	Finance
2	Human Resources
3	IT
4	Sales
5	Marketing

The SQL query to delete data from the Employees table will be as follows.

DELETE Employee WHERE ID = 5

Now let us see, on how to execute this SQL statement using the ExecuteCommand() method .

EmployeeClassesDataContext dbContext = new EmployeeClassesDataContext();

//

dbContext.ExecuteCommand("DELETE Employee WHERE ID = {0}", 5);

That’s it, after this code is executed you can find the details of the employee is removed from the Employees table, as follows.

ID	NAME	DOB	DOJ	DepartmentID	Salery
1	Tom	11/11/1967	05/01/2009	1	5000
2	Harry	10/07/1973	05/01/2009	2	6000
3	Peter	01/01/1981	01/01/2001	3	6500
4	John	05/04/1981	05/01/2009	3	7500

Related Post

What is LINQ?
LINQ to SQL
LINQ To SQL Vs ADO.Net Entity Framework
LINQ to SQL Sample
LINQ to SQL Select Query with Specific columns
LINQ to SQL Select query with Filter (WHERE Clause)
LINQ to SQL Select Query with Alias Name
LINQ to SQL - Sub Queries
LINQ to SQL – Join 2 Tables
LINQ to SQL – Select DISTINCT Values
LINQ to SQL – Select with SORT (ORDER BY)
LINQ to SQL – Select with AGGREGATE (GROUP BY)
LINQ to SQL – INNER JOIN
LINQ to SQL – LEFT OUTER JOIN
LINQ to SQL – RIGHT OUTER JOIN
LINQ to SQL – INSERT
LINQ to SQL – UPDATE
LINQ to SQL – DELETE
LINQ to SQL – Using ExecuteCommand() to Execute SQL Statements