本文整理匯總了VB.NET中System.Data.SqlClient.SqlCommand.ExecuteScalar方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET SqlCommand.ExecuteScalar方法的具體用法？VB.NET SqlCommand.ExecuteScalar怎麽用？VB.NET SqlCommand.ExecuteScalar使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Data.SqlClient.SqlCommand的用法示例。
在下文中一共展示了SqlCommand.ExecuteScalar方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: AddProductCategory
Public Function AddProductCategory( _
ByVal newName As String, ByVal connString As String) As Integer
Dim newProdID As Int32 = 0
Dim sql As String = _
"INSERT INTO Production.ProductCategory (Name) VALUES (@Name); " _
& "SELECT CAST(scope_identity() AS int);"
Using conn As New SqlConnection(connString)
Dim cmd As New SqlCommand(sql, conn)
cmd.Parameters.Add("@Name", SqlDbType.VarChar)
cmd.Parameters("@Name").Value = newName
Try
conn.Open()
newProdID = Convert.ToInt32(cmd.ExecuteScalar())
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
End Using
Return newProdID
End Function示例2: SqlCommand.ExecuteScalar()
' 導入命名空間
Imports System
Imports System.Data
Imports System.Data.SqlClient
public class MainClass
Shared Sub Main()
Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;database=MyDatabase")
'Create Command object
Dim nonqueryCommand As SqlCommand = thisConnection.CreateCommand()
Try
' Open Connection
thisConnection.Open()
Console.WriteLine("Connection Opened")
'Create Command objects
Dim scalarCommand As New SqlCommand("SELECT COUNT(*) FROM Employee", thisConnection)
' Execute Scalar Query
Console.WriteLine("Before INSERT, Number of Employees = {0}", _
scalarCommand.ExecuteScalar())
Catch ex As SqlException
' Display error
Console.WriteLine("Error: " & ex.ToString())
Finally
' Close Connection
thisConnection.Close()
Console.WriteLine("Connection Closed")
End Try
End Sub
End Class