execute multiple SELECT statements(select) using a SqlCommand object and read the results using a SqlDataReader object : SqlCommand : Database C# Source Code

execute multiple SELECT statements(select) using a SqlCommand object and read the results using a SqlDataReader object

    
 

using System;
using System.Data;
using System.Data.SqlClient;

class ExecuteSelect {
    public static void Main() {
        SqlConnection mySqlConnection = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=sa");
        SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
        mySqlCommand.CommandText =
          "SELECT TOP 5 ProductID, ProductName " +
          "FROM Products " +
          "ORDER BY ProductID;" +
          "SELECT TOP 3 CustomerID, CompanyName " +
          "FROM Customers " +
          "ORDER BY CustomerID;" +
          "SELECT TOP 6 OrderID, CustomerID " +
          "FROM Orders " +
          "ORDER BY OrderID;";

        mySqlConnection.Open();

        SqlDataReader mySqlDataReader = mySqlCommand.ExecuteReader();
        do {
            while (mySqlDataReader.Read()) {
                Console.WriteLine("mySqlDataReader[0] = " + mySqlDataReader[0]);
                Console.WriteLine("mySqlDataReader[1] = " + mySqlDataReader[1]);
            }
        } while (mySqlDataReader.NextResult());

        mySqlDataReader.Close();
        mySqlConnection.Close();
    }
}

 
    
   
  
   

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• Use the GetOrdinal() method of a DataReader object to get the numeric positions of a column
• How to use the ExecuteScalar() method to run a SELECT statement that returns a single value
• Use the ExecuteNonQuery() method to run INSERT, UPDATE, and DELETE statements
• Use SqlCommand to call SQL and insert data to database table
• Delete data from database using SqlCommand
• Get row count from SqlCommand
• Pass parameters to SqlCommand
• Get row count by 'ExecuteScalar'
• Execute multiple SQL statements(insert) using a SqlCommand object
• Async Command Object
• Populate a DataSet object using a SELECT statement
• Use ExecuteXmlReader() to run a SELECT statement that returns XML