Schema Informations 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 SqlCommand Object execute , it instantiate a SqlClient.SqlDataReader Object.
DDim sqlReader As SqlDataReader = sqlCmd.ExecuteReader()
While a SqlDataReader is open, you can retrieve schema information about the current result set using the GetSchemaTable method. GetSchemaTable returns a DataTable object populated with rows and columns that contain the schema information for the current result set.
Imports System.Data.SqlClient
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim connetionString As String
Dim sqlCnn As SqlConnection
Dim sqlCmd As SqlCommand
Dim sql As String
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)
Dim sqlReader As SqlDataReader = sqlCmd.ExecuteReader()
Dim schemaTable As DataTable = sqlReader.GetSchemaTable()
Dim row As DataRow
Dim column As DataColumn
For Each row In schemaTable.Rows
For Each column In schemaTable.Columns
MsgBox(String.Format("{0} = {1}", column.ColumnName, row(column)))
Next
Next
sqlReader.Close()
sqlCmd.Dispose()
sqlCnn.Close()
Catch ex As Exception
MsgBox("Can not open connection ! ")
End Try
End Sub
End Class |
connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password"
sql = "Select * from product"
You have to replace the string with your realtime variables.
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