access|存储过程
1.存储过程在access中如何运行?
不像access中的其他对象或者ms sql中可以有直观的设计界面,在access中的存储过程,没有这些,所以我们不能在access中建立他们,我将向大家展示在ado.net中如何操作他们。
2。创建存储过程
我们需要使用一段sql语句来创建存储过程,我们使用事例数据库Northwind 来说明我们的例子。
一个简单的存储过程
"CREATE PROC procProductsList AS SELECT * FROM Products;"
CREATE PROC procProductsList 意思是创建存储过程as 后面可以是任何有效的sql语句。
但是有的时候我们需要制定某一参数,比如我们要删除指定ProductsID 的记录,这时就需要这样的存储过程。"CREATE PROC procProductsDeleteItem(inProductsID LONG)" & _
"AS DELETE FROM Products WHERE ProductsID = inProductsID;" 在给出一个更复杂的:
"CREATE PROC procProductsAddItem(inProductName VARCHAR(40), " & _
"inSupplierID LONG, inCategoryID LONG) " & _
"AS INSERT INTO Products (ProductName, SupplierID, CategoryID) " & _
"Values (inProductName, inSupplierID, inCategoryID);""CREATE PROC procProductsUpdateItem(inProductID LONG, " & _
" inProductName VARCHAR(40)) " & _
"AS UPDATE Products SET ProductName = inProductName " & _
" WHERE ProductID = inProductID;"好了,原理已经知道了。我们把这些综合一下做一个模块,岂不更好,说干就干。
Imports SystemImports System.DataImports System.Data.OleDbModule CreateSP Sub Main() ProductsProcs() End Sub ' Products Stored Procs to be added to the db. Sub ProductsProcs() Dim sSQL As String ' procProductsList - Retrieves entire table sSQL = "CREATE PROC procProductsList AS SELECT * FROM Products;" CreateStoredProc(sSQL) ' procProductsDeleteItem - Returns the details (one record) from the ' JobTitle table sSQL = "CREATE PROC procProductsDeleteItem(@ProductID LONG) AS " _ & "DELETE FROM Products WHERE ProductID = @ProductID;" CreateStoredProc(sSQL) ' procProductsAddItem - Add one record to the JobTitle table sSQL = "CREATE PROC procProductsAddItem(inProductName VARCHAR(40), " _ & "inSupplierID LONG, inCategoryID LONG) AS INSERT INTO " _ & "Products (ProductName, SupplierID, CategoryID) Values " _ & "(inProductName, inSupplierID, CategoryID);" CreateStoredProc(sSQL) ' procProductsUpdateItem - Update one record on the JobTitle table sSQL = "CREATE PROC procProductsUpdateItem(inProductID LONG, " _ & "inProductName VARCHAR(40)) AS UPDATE Products SET " _ & "ProductName = inProductName WHERE ProductID = inProductID;" CreateStoredProc(sSQL) End Sub ' Execute the creation of Stored Procedures Sub CreateStoredProc(ByVal sSQL As String) Dim con As OleDbConnection Dim cmd As OleDbCommand = New OleDbCommand() Dim da As OleDbDataAdapter ' Change Data Source to the location of Northwind.mdb on your local ' system. Dim sConStr As String = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data " _ & "Source=C:/Program Files/Microsoft " _ & "Office/Office10/Samples/Northwind.mdb" con = New OleDbConnection(sConStr) cmd.Connection = con cmd.CommandText = sSQL con.Open() cmd.ExecuteNonQuery() con.Close() End SubEnd Module
(未完待续)
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