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SqlCommand and SqlParameter - (ADO.NET and SQL Server)

SqlCommand and SqlParameter are two important classes in ADO.NET that are used for working with SQL Server databases. The SqlCommand class is used to execute SQL statements or stored procedures, while the SqlParameter class is used to add parameters to the SQL statement or stored procedure to prevent SQL injection attacks.

Syntax

Here is the basic syntax for creating a SqlCommand object:

SqlCommand cmd = new SqlCommand();

Here is an example of creating a SqlParameter object and adding it to a SqlCommand object:

// Create a new parameter for the SqlCommand object
SqlParameter param = new SqlParameter("@ParamName", SqlDbType.VarChar);
param.Value = "parameter value";

// Add the parameter to the SqlCommand object
cmd.Parameters.Add(param);

Example

Here is an example of using SqlCommand and SqlParameter to execute a SQL statement that retrieves data from a SQL Server database:

// Create a SqlCommand object with a SELECT statement and a connection object
SqlCommand cmd = new SqlCommand("SELECT * FROM Customers WHERE Country=@Country", conn);

// Create a SqlParameter object to add a parameter to the SQL statement
SqlParameter param = new SqlParameter("@Country", SqlDbType.NVarChar);
param.Value = "USA";

// Add the SqlParameter object to the SqlCommand object
cmd.Parameters.Add(param);

// Execute the SqlCommand object and retrieve data from the database
SqlDataReader reader = cmd.ExecuteReader();

Output

The output of the above example will be a SqlDataReader object that contains the data retrieved from the database.

Explanation

The SqlCommand class is used to execute SQL statements or stored procedures against a SQL Server database. The SqlConnection object must be created before executing a command. The parameters can be added to a SqlCommand object using the SqlParameter class. The parameters help prevent SQL injection attacks by ensuring that user input is sanitized before being executed against the database.

Use

SqlCommand and SqlParameter are commonly used in ADO.NET applications for querying and manipulating data in SQL Server databases. They are used for executing SQL statements, stored procedures, and user-defined functions. SqlCommand and SqlParameter are essential components of any ADO.NET application that interacts with a SQL Server database.

Important Points

  • SqlCommand is used to execute SQL statements or stored procedures against a SQL Server database.
  • SqlParameter is used to add parameters to a SqlCommand object to prevent SQL injection attacks.
  • SqlCommand and SqlParameter are important components of any ADO.NET application that interacts with a SQL Server database.

Summary

In this page, we discussed SqlCommand and SqlParameter, which are used for working with SQL Server databases in ADO.NET. We covered their syntax, example, output, explanation, use, and important points. SqlCommand and SqlParameter are essential components of any ADO.NET application that interacts with a SQL Server database, and are used for executing SQL statements or stored procedures and preventing SQL injection attacks.

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