C# Table Schema from SqlDataReader
The SqlDataReader Object is a stream-based , forward-only, read-only retrieval of query results from the Data Source, which do not update the data. When the ExecuteReader method in C# SqlCommand Object execute , it will instantiate a SqlClient.SqlDataReader Object.
SqlDataReader sqlReader = sqlCmd.ExecuteReader();
While SqlDataReader is open, you can retrieve the schema information about the current result set using the GetSchemaTable method of SqlDataReader. GetSchemaTable returns a DataTable object, which populated with rows and columns that contain the schema information for the current result set.
using System;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string connetionString = null;
SqlConnection sqlCnn ;
SqlCommand sqlCmd ;
string sql = null;
connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password";
sql = "Select * from product";
sqlCnn = new SqlConnection(connetionString);
try
{
sqlCnn.Open();
sqlCmd = new SqlCommand(sql, sqlCnn);
SqlDataReader sqlReader = sqlCmd.ExecuteReader();
DataTable schemaTable = sqlReader.GetSchemaTable();
foreach (DataRow row in schemaTable.Rows)
{
foreach (DataColumn column in schemaTable.Columns)
{
MessageBox.Show (string.Format("{0} = {1}", column.ColumnName, row[column]));
}
}
sqlReader.Close();
sqlCmd.Dispose();
sqlCnn.Close();
}
catch (Exception ex)
{
MessageBox.Show("Can not open connection ! ");
}
}
}
} |
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