ASP.NET(vb.net) & SQL Server Database Class - This is example scripts how to use ASP.NET database class and SQL Server database (System.Data.SqlClient)
ShotDev Focus:
- ASP.NET(vb.net) & SQL Server Database Class
Example
clsDatabase.vb
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Public Class clsDatabase
Private objConn As SqlConnection
Private objCmd As SqlCommand
Private Trans As SqlTransaction
Private strConnString As String
Public Sub New()
strConnString = System.Configuration.ConfigurationSettings.AppSettings("ConnectionString")
End Sub
Public Function QueryDataReader(ByVal strSQL As String) As SqlDataReader
Dim dtReader As SqlDataReader
objConn = New SqlConnection
With objConn
.ConnectionString = strConnString
.Open()
End With
objCmd = New SqlCommand(strSQL, objConn)
dtReader = objCmd.ExecuteReader()
Return dtReader '*** Return DataReader ***'
End Function
Public Function QueryDataSet(ByVal strSQL As String) As DataSet
Dim ds As New DataSet
Dim dtAdapter As New SqlDataAdapter
objConn = New SqlConnection
With objConn
.ConnectionString = strConnString
.Open()
End With
objCmd = New SqlCommand
With objCmd
.Connection = objConn
.CommandText = strSQL
.CommandType = CommandType.Text
End With
dtAdapter.SelectCommand = objCmd
dtAdapter.Fill(ds)
Return ds '*** Return DataSet ***'
End Function
Public Function QueryDataTable(ByVal strSQL As String) As DataTable
Dim dtAdapter As SqlDataAdapter
Dim dt As New DataTable
objConn = New SqlConnection
With objConn
.ConnectionString = strConnString
.Open()
End With
dtAdapter = New SqlDataAdapter(strSQL, objConn)
dtAdapter.Fill(dt)
Return dt '*** Return DataTable ***'
End Function
Public Function QueryExecuteNonQuery(ByVal strSQL As String) As Boolean
objConn = New SqlConnection
With objConn
.ConnectionString = strConnString
.Open()
End With
Try
objCmd = New SqlCommand
With objCmd
.Connection = objConn
.CommandType = CommandType.Text
.CommandText = strSQL
End With
objCmd.ExecuteNonQuery()
Return True '*** Return True ***'
Catch ex As Exception
Return False '*** Return False ***'
End Try
End Function
Public Function QueryExecuteScalar(ByVal strSQL As String) As Object
Dim obj As Object
objConn = New SqlConnection
With objConn
.ConnectionString = strConnString
.Open()
End With
Try
objCmd = New SqlCommand
With objCmd
.Connection = objConn
.CommandType = CommandType.Text
.CommandText = strSQL
End With
obj = objCmd.ExecuteScalar() '*** Return Scalar ***'
Return obj
Catch ex As Exception
Return Nothing '*** Return Nothing ***'
End Try
End Function
Public Function TransStart()
objConn = New SqlConnection
With objConn
.ConnectionString = strConnString
.Open()
End With
Trans = objConn.BeginTransaction(IsolationLevel.ReadCommitted)
End Function
Public Function TransExecute(ByVal strSQL As String) As Boolean
objCmd = New SqlCommand
With objCmd
.Connection = objConn
.Transaction = Trans
.CommandType = CommandType.Text
.CommandText = strSQL
End With
objCmd.ExecuteNonQuery()
End Function
Public Function TransRollBack()
Trans.Rollback()
End Function
Public Function TransCommit()
Trans.Commit()
End Function
Public Sub Close()
objConn.Close()
objConn = Nothing
End Sub
End Class
AspNetDatabase.aspx
<%@ Import Namespace="System.Data"%>
<%@ Import Namespace="System.Data.SqlClient"%>
<%@ Page Language="VB" %>
<script runat="server">
Dim clsDB As New clsDatabase
Sub Page_Load(sender As Object, e As EventArgs)
Call myDataReader()
Call myDataSet()
Call myDataTable()
Call myQueryExecuteScalar()
Call myExecuteNonQuery()
Call myExecuteTransaction()
End Sub
'*** DataReader ***'
Sub myDataReader()
Dim strSQL As String
Dim dtReader As SqlDataReader
strSQL = "SELECT * FROM customer "
dtReader = clsDB.QueryDataReader(strSQL)
Me.myGridView1.DataSource = dtReader
Me.myGridView1.DataBind()
'*** Bind Rows ***'
'If dtReader.HasRows = True Then
' Me.lblCustomerID.Text = dtReader.Item("CustomerID")
' Me.lblName.Text = dtReader.Item("Name")
' Me.lblEmail.Text = dtReader.Item("Email")
' Me.lblCountryCode.Text = dtReader.Item("CountryCode")
' Me.lblBudget.Text = dtReader.Item("Budget")
' Me.lblUsed.Text = dtReader.Item("Used")
'End If
clsDB.Close()
End Sub
'*** DataSet ***'
Sub myDataSet()
Dim strSQL As String
Dim ds As DataSet
strSQL = "SELECT * FROM customer "
ds = clsDB.QueryDataSet(strSQL)
Me.myGridView2.DataSource = ds.Tables(0).DefaultView
Me.myGridView2.DataBind()
'*** Bind Rows ***'
'If ds.Tables(0).Rows.Count > 0 Then
' Me.lblCustomerID.Text = ds.Tables(0).Rows(0)("CustomerID")
' Me.lblName.Text = ds.Tables(0).Rows(0)("Name")
' Me.lblEmail.Text = ds.Tables(0).Rows(0)("Email")
' Me.lblCountryCode.Text = ds.Tables(0).Rows(0)("CountryCode")
' Me.lblBudget.Text = ds.Tables(0).Rows(0)("Budget")
' Me.lblUsed.Text = ds.Tables(0).Rows(0)("Used")
'End If
clsDB.Close()
End Sub
'*** DataTable ***'
Sub myDataTable()
Dim strSQL As String
Dim dt As DataTable
strSQL = "SELECT * FROM customer "
dt = clsDB.QueryDataTable(strSQL)
Me.myGridView3.DataSource = dt
Me.myGridView3.DataBind()
'*** Bind Rows ***'
If dt.Rows.Count > 0 Then
Me.lblCustomerID.Text = dt.Rows(0)("CustomerID")
Me.lblName.Text = dt.Rows(0)("Name")
Me.lblEmail.Text = dt.Rows(0)("Email")
Me.lblCountryCode.Text = dt.Rows(0)("CountryCode")
Me.lblBudget.Text = dt.Rows(0)("Budget")
Me.lblUsed.Text = dt.Rows(0)("Used")
End If
clsDB.Close()
End Sub
'*** Execute Scalar ***'
Sub myQueryExecuteScalar()
Dim strSQL As String
strSQL = "SELECT MAX(Budget) FROM customer "
Me.lblText.Text = clsDB.QueryExecuteScalar(strSQL)
clsDB.Close()
End Sub
'*** ExecuteNonQuery ***'
Sub myExecuteNonQuery()
Dim strSQL1, strSQL2, strSQL3 As String
'*** Insert ***'
strSQL1 = "INSERT INTO customer (CustomerID,Name,Email,CountryCode,Budget,Used) " & _
" VALUES('C005','Weerachai Nukitram','webmaster@shotdev.com','TH','200000','100000')"
If clsDB.QueryExecuteNonQuery(strSQL1) = True Then
'*** Condition Success ***'
Else
'*** Condition Error ***'
End If
clsDB.Close()
'*** Update ***'
strSQL2 = "UPDATE customer SET Budget = '3000000' WHERE CustomerID = 'C005' "
If clsDB.QueryExecuteNonQuery(strSQL2) = True Then
'*** Condition Success ***'
Else
'*** Condition Error ***'
End If
clsDB.Close()
'*** Delete ***'
strSQL3 = "DELETE FROM customer WHERE CustomerID = 'C005' "
If clsDB.QueryExecuteNonQuery(strSQL3) = True Then
'*** Condition Success ***'
Else
'*** Condition Error ***'
End If
clsDB.Close()
End Sub
'*** Execute Transaction ***'
Sub myExecuteTransaction()
Dim strSQL1, strSQL2, strSQL3 As String
'*** Start Transaction ***'
clsDB.TransStart()
Try
'*** Insert ***'
strSQL1 = "INSERT INTO customer (CustomerID,Name,Email,CountryCode,Budget,Used) " & _
" VALUES('C005','Weerachai Nukitram','webmaster@shotdev.com','TH','200000','100000')"
clsDB.TransExecute(strSQL1) '*** Execute Query 1 ***'
'*** Update ***'
strSQL2 = "UPDATE customer SET Budget = '3000000' WHERE CustomerID = 'C005' "
clsDB.TransExecute(strSQL2) '*** Execute Query 2 ***
'*** Delete ***'
strSQL3 = "DELETE FROM customer WHERE CustomerID = 'C005' "
clsDB.TransExecute(strSQL3) '*** Execute Query 3 ***
'*** Commit Transaction ***'
clsDB.TransCommit()
Catch ex As Exception
'*** RollBack Transaction ***'
clsDB.TransRollBack()
End Try
clsDB.Close()
End Sub
</script>
<html>
<head>
<title>ShotDev.Com Tutorial</title>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView id="myGridView1" runat="server"></asp:GridView>
<br>
<br>
<asp:GridView id="myGridView2" runat="server"></asp:GridView><br>
<br>
<asp:GridView id="myGridView3" runat="server"></asp:GridView><br>
<table style="WIDTH: 300px" border="1">
<tr>
<td style="WIDTH: 93px">
<asp:Label id="lblHeaderCustomerID" runat="server" Text="CustomerID"></asp:Label></td>
<td style="WIDTH: 213px">
<asp:Label id="lblCustomerID" runat="server"></asp:Label></td>
</tr>
<tr>
<td style="WIDTH: 93px">
<asp:Label id="lblHeaderName" runat="server" Text="Name"></asp:Label></td>
<td style="WIDTH: 213px">
<asp:Label id="lblName" runat="server"></asp:Label></td>
</tr>
<tr>
<td style="WIDTH: 93px">
<asp:Label id="lblHeaderEmail" runat="server" Text="Email"></asp:Label></td>
<td style="WIDTH: 213px; HEIGHT: 23px">
<asp:Label id="lblEmail" runat="server"></asp:Label></td>
</tr>
<tr>
<td style="WIDTH: 93px">
<asp:Label id="lblHeaderCountryCode" runat="server" Text="CountryCode"></asp:Label></td>
<td style="WIDTH: 213px; HEIGHT: 23px">
<asp:Label id="lblCountryCode" runat="server"></asp:Label></td>
</tr>
<tr>
<td style="WIDTH: 93px">
<asp:Label id="lblHeaderBudget" runat="server" Text="Budget"></asp:Label></td>
<td style="WIDTH: 213px; HEIGHT: 21px">
<asp:Label id="lblBudget" runat="server"></asp:Label></td>
</tr>
<tr>
<td style="WIDTH: 93px">
<asp:Label id="lblHeaderUsed" runat="server" Text="Used"></asp:Label></td>
<td style="WIDTH: 213px; HEIGHT: 21px">
<asp:Label id="lblUsed" runat="server"></asp:Label></td>
</tr>
</table>
<br>
<asp:Label id="lblText" runat="server"></asp:Label>
</form>
</body>
</html>
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