How do I count the number of rows returned in my SQLite reader in C#?

Question

I\'m working in Microsoft Visual C# 2008 Express and with SQLite.

I\'m querying my database with something like this:

SQLiteCommand cmd = new SQLiteC         


        

Answer 1

Here is my full implementation in a static method. You should be able to plug this into your class (replace _STR_DB_FILENAME & STR_TABLE_NAME with your database file name and table name).

    /// 

    /// Returns a count of the number of items in the database.
    /// 
    /// 
    public static int GetNumberOfItemsInDB()
    {
        // Initialize the count variable to be returned
        int count = 0;            

        // Start connection to db
        using (SqliteConnection db =
            new SqliteConnection("Filename=" + _STR_DB_FILENAME))
        {
            // open connection
            db.Open();

            SqliteCommand queryCommand = new SqliteCommand();
            queryCommand.Connection = db;

            // Use parameterized query to prevent SQL injection attacks
            queryCommand.CommandText = "SELECT COUNT(*) FROM " + _STR_TABLE_NAME;
            // Execute command and convert response to Int
            count = Convert.ToInt32(queryCommand.ExecuteScalar());
            // Close connection
            db.Close();
        }
        // return result(count)
        return count;
    }

Note: To improve performance, you can replace '' in "SELECT COUNT()…." with the column name of the primary key in your table for much faster performance on larger datasets.