ADO.NET对象的构造(1)_OleDbDataAdapter

领测软件测试网 OleDbDataAdapter 构造



n Public Sub New()
n Public Sub New(ByVal selectCommand As OleDbCommand)

n Public Sub New(ByVal selectCommandText As String,ByVal selectConnection As OleDbConnection)

n Public Sub New(ByVal selectCommandText As String,ByVal selectConnectionString As String)



参数

selectCommand OleDbCommand，它是 SELECT 语句或存储过程，被设置为 OleDbDataAdapter 的 SelectCommand 属性。
selectCommandText 一个字符串，它是 SQL SELECT 语句或将由 OleDbDataAdapter 的 SelectCommand 属性使用的存储过程。
selectConnection 表示连接的 OleDbConnection。
selectConnectionString 连接字符串。


备注

当创建 OleDbDataAdapter 的实例时，下面的读/写属性将设置为以下初始值。

Properties
初始值

MissingMappingAction
MissingMappingAction.Passthrough

MissingSchemaAction
MissingSchemaAction.Add





可以通过单独调用属性来更改任何这些属性的值。



示例

Public Sub CreateOleDbDataAdapter()

Dim myOleDbConnection As OleDbConnection = New OleDbConnection("Provider=SQLOLEDB;Data Source=localhost;Integrated Security=SSPI;Initial Catalog=northwind")



Dim custDA As OleDbDataAdapter = New OleDbDataAdapter



Dim myOleDbCommand As OleDbCommand = New OleDbCommand("SELECT CustomerID, CompanyName FROM CUSTOMERS", myOleDbConnection)

Dim custDA As OleDbDataAdapter = New OleDbDataAdapter(myOleDbCommand)



Dim mySelectText As String = "SELECT CustomerID, CompanyName FROM CUSTOMERS"

Dim custDA As OleDbDataAdapter = New OleDbDataAdapter(mySelectText, myOleDbConnection)



Dim mySelectText As String = "SELECT CustomerID, CompanyName FROM CUSTOMERS"

Dim myConnString As String = "Provider=SQLOLEDB;Data Source=localhost;Integrated Security=SSPI;Initial Catalog=northwind"

Dim custDA As OleDbDataAdapter = New OleDbDataAdapter(mySelectText, myConnString)



custDA.MissingSchemaAction = MissingSchemaAction.AddWithKey



custDA.SelectCommand = New OleDbCommand("SELECT CustomerID, CompanyName FROM CUSTOMERS", myOleDbConnection)

custDA.InsertCommand = New OleDbCommand("INSERT INTO Customers (CustomerID, CompanyName) VALUES (?, ?)", myOleDbConnection)

custDA.UpdateCommand = New OleDbCommand("UPDATE Customers SET CustomerID = ?, CompanyName = ? WHERE CustomerID = ?", myOleDbConnection)

custDA.DeleteCommand = New OleDbCommand("DELETE FROM Customers WHERE CustomerID = ?", myOleDbConnection)



custDA.InsertCommand.Parameters.Add("@CustomerID", OleDbType.Char, 5, "CustomerID")

custDA.InsertCommand.Parameters.Add("@CompanyName", OleDbType.VarChar, 40, "CompanyName")



custDA.UpdateCommand.Parameters.Add("@CustomerID", OleDbType.Char, 5, "CustomerID")

custDA.UpdateCommand.Parameters.Add("@CompanyName", OleDbType.VarChar, 40, "CompanyName")

custDA.UpdateCommand.Parameters.Add("@oldCustomerID", OleDbType.Char, 5, "CustomerID").SourceVersion = DataRowVersion.Original



custDA.DeleteCommand.Parameters.Add("@CustomerID", OleDbType.Char, 5, "CustomerID").SourceVersion = DataRowVersion.Original

End Sub



(信息整理来自MSDN)

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