数据库删除行

Question

so this is my code

for (int i = 0; i < users_table.RowCount; ++i)
{
    SQLDatabase.DatabaseRow row = users_table.GetRow(i); //get current ID.
    if (userID == users_table.GetRow(i)["ID"]) //if userID is the same as it's in the row
    {
        row["ID"] = "0";
        row["Name"] = "DELETED";
        row["Username"] = "DELETED";
        row["Password"] = "DELETED";
        row["UserType"] = "DELETED";
        row["LastLoginDate"] = "0";
        row["LastLoginTime"] = "0";
        users_table.Update(row);
    }
}

My goal is to delete a row. Sadly I'm unable to insert NULL values etc., any idea how I could delete that row? I would like to add that I do not have .delete functions or anything in particular. I would be glad if you could tell me how to add them.

Thanks.

Answer 1

(This answer assumes you're using SQL Server)

You can easily execute SQL Commands using System.Data.SqlClient. The connection string would be the connection details to your database instance. You can see some more examples of how to construct your connection string @ Connection String Examples . Also, when you're deleting rows from your database you want to utilize the DELETE command not the UPDATE. More details can be found on DELETE (Transact-SQL)

    public void deleteRow()
    {
       string connectionString = "Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password = myPassword; ";
       string queryString = "DELETE FROM Test_Table WHERE ID = 5";
       using (SqlConnection connection = new SqlConnection(
       connectionString))
        {
            SqlCommand command = new SqlCommand(queryString, connection);
            command.Connection.Open();
            command.ExecuteNonQuery();
        }
    }