如何在运行时使用C＃在MS Access中创建存储查询

Question

我正在使用Windows应用程序。在这里，我需要在运行时在MS Access 2007中创建存储的查询（即在按钮单击时）选择，插入，更新，删除，如何根据参数调用表单中的查询？

cmmd.CommandText = "CREATE TABLE tblCustomers ([CustomerID] AUTOINCREMENT PRIMARY KEY, CustomerName Text(50), [CategoryID] Long REFERENCES tblCategories (CategoryID), [IsActive] YesNo, [ModifiedBy] Long REFERENCES tblUsers (UserID), [ModifiedDate] Date)"; 
cmmd.ExecuteNonQuery(); 

//Above Create table tblCustomers executed successfully, 

cmmd.CommandText = @"CREATE PROCEDURE prAddCustmer (CustName Text(50), CatID Long, Inact No, ModBY Long, ModDate date) AS INSERT INTO tblCustomers (CustomerName , CategoryID, Inactive, ModifiedBy, ModifiedDate) VALUES(CustName, [CatID], [Inac], [ModBy], [ModDate]);"; 
cmmd.ExecuteNonQuery(); 
//But got error in Create Procedure prAddCustomers, Please find error in the Stored query and suggest the correct answer 
//Syntax error in PARAMETER clause. 

Answer 1

如果你想在你的Access数据库中创建一个新的存储查询，您应该简单地准备命令并执行它。

例如，假设您有客户表，并且您想要使用查询检索单个客户的记录。

要创建查询

string cmdText = @"CREATE PROCEDURE Customer_SelectOne (custID Long) as 
    SELECT * FROM Customers WHERE IDCustomer = [custID]"; 
OleDbCommand cmd = new OleDbCommand(cmdText, connection); 
cmd.ExecuteNonQuery(); 

要调用查询，它再是一个简单的命令标记为CommandType = CommandType.StoredProcedure

string cmdText = "Customer_SelectOne"; 
OleDbCommand cmd = new OleDbCommand(cmdText, connection); 
cmd.CommandType = CommandType.StoredProcedure; 
cmd.Parameters.AddWithValue("custID", customerID); 
OleDbDataReader reader = cmd.ExecuteReader(); 

上面的例子是非常简单的。对于更复杂的情况，您需要查看MS-Access Data Definition Language区域中的参考。

编辑

语法：

CREATE PROCEDURE ProcName 
       (optional list of parameters with type and size for Text) 
        AS 
       (Valid SQL Statement using the optional parameters list) 

所以这应该是你的 'prAddCustomers'

cmmd.CommandText = @"CREATE PROCEDURE prAddCustomers 
        (CustName Text(50), 
         CatID Long, 
         IsActive BIT, 
         ModBY Long, 
         ModDate DATETIME) 
        as 
        INSERT INTO tblCustomers 
         (CustomerName, CategoryID, IsActive, ModifiedBy, ModifiedDate) 
        VALUES([CustName], [CatID], [IsActive], [ModID],[ModDate])";