Retrieves a schema table for a query : DataTable « ADO.Net « C# / CSharp Tutorial





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

public class GetSchema
{
    public static void Main() 
    {
        string connectionString = "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI";
        string SQL = "SELECT * FROM CUSTOMERS";

        SqlConnection con = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand(SQL, con);
        SqlDataReader r;
        DataTable schema;

        con.Open();
        r = cmd.ExecuteReader();
        schema = r.GetSchemaTable();
        con.Close();
        foreach (DataRow row in schema.Rows)
        {
            foreach (DataColumn col in schema.Columns)
            {
                Console.WriteLine(col.ColumnName + " = " + row[col]);
            }
        }
    }
}










32.36.DataTable
32.36.1.Loop through DataTable by DataRow
32.36.2.Use DataTable to insert a Row
32.36.3.Add Row to DataTable
32.36.4.Accessing Data Values in a DataTable or DataSet
32.36.5.Adding Columns to DataTable
32.36.6.Adding Constraint to DataTable
32.36.7.Adding a Calculated Column to a DataTable
32.36.8.Adding a Column to a Child DataTable That Displays Data from the Parent Table
32.36.9.Adding a Column to a Parent DataTable That Aggregates a Child Table's Column Values
32.36.10.Creating a DataColumn and Adding It to a DataTable
32.36.11.Creating a DataTable and Adding It to a DataSet
32.36.12.Retrieving a Result Set Using a DataTable or a DataSet
32.36.13.Pop DataTable
32.36.14.Output Constraint Properties
32.36.15.Output the rows from the DataTable with foreach loop over DataRowCollection
32.36.16.Modify DataTable
32.36.17.Loop through the rows in DataTable
32.36.18.Creating Single- and Multi-Column Primary Keys
32.36.19.Creating a Unique Constraint
32.36.20.Append columns to DataTable
32.36.21.Accessing FirstName value in row 3 directly
32.36.22.Filter Sort
32.36.23.Retrieves a schema table for a query