SELECT @@IDENTITY 如何应用?Using cmd As New OleDbCommand("SELECT @@IDENTITY",mcnn)If eventArgs.StatementType = StatementType.Insert TheneventArgs.Row("CustomerID") = CInt(cmd.ExecuteScalar())End IfEnd UsingSELECT @@IDENTITY 上述程序实现什
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![SELECT @@IDENTITY 如何应用?Using cmd As New OleDbCommand(](/uploads/image/z/10487414-38-4.jpg?t=SELECT+%40%40IDENTITY+%E5%A6%82%E4%BD%95%E5%BA%94%E7%94%A8%3FUsing+cmd+As+New+OleDbCommand%28%22SELECT+%40%40IDENTITY%22%2Cmcnn%29If+eventArgs.StatementType+%3D+StatementType.Insert+TheneventArgs.Row%28%22CustomerID%22%29+%3D+CInt%28cmd.ExecuteScalar%28%29%29End+IfEnd+UsingSELECT+%40%40IDENTITY+%E4%B8%8A%E8%BF%B0%E7%A8%8B%E5%BA%8F%E5%AE%9E%E7%8E%B0%E4%BB%80)
SELECT @@IDENTITY 如何应用?Using cmd As New OleDbCommand("SELECT @@IDENTITY",mcnn)If eventArgs.StatementType = StatementType.Insert TheneventArgs.Row("CustomerID") = CInt(cmd.ExecuteScalar())End IfEnd UsingSELECT @@IDENTITY 上述程序实现什
SELECT @@IDENTITY 如何应用?
Using cmd As New OleDbCommand("SELECT @@IDENTITY",mcnn)
If eventArgs.StatementType = StatementType.Insert Then
eventArgs.Row("CustomerID") = CInt(cmd.ExecuteScalar())
End If
End Using
SELECT @@IDENTITY 上述程序实现什么功能?
SELECT @@IDENTITY 如何应用?Using cmd As New OleDbCommand("SELECT @@IDENTITY",mcnn)If eventArgs.StatementType = StatementType.Insert TheneventArgs.Row("CustomerID") = CInt(cmd.ExecuteScalar())End IfEnd UsingSELECT @@IDENTITY 上述程序实现什
@@identity是表示的是最近一次向具有identity属性(即自增列)的表插入数据时对应的自增列的值,是系统定义的全局变量.一般系统定义的全局变量都是以@@开头,用户自定义变量以@开头.比如有个表A,它的自增列是id,当向A表插入一行数据后,如果插入数据后自增列的值自动增加至101,则通过select @@identity得到的值就是101.使用@@identity的前提是在进行insert操作后,执行select @@identity的时候连接没有关闭,否则得到的将是NULL值.