The ChangeDatabase method of the ADO.NET Connection object requires an open connection to execute correctly. Even if the connection is open, you can still have an InvalidOperationException when invoking this
A common mistake when creating a .NET component that runs under Component Services – that is, a class that inherits from ServicedComponents – is that you forget to assign a
A CallableStatement object provides a standard way for all RDBMS’ to call stored procedures. A stored procedure is stored in a database; the call to the stored procedure is what
This code is how to send NET SEND messages to all the connected SQL Server users in an NT local area network: CREATE PROC notify_users(@notification VARCHAR(100) = ‘SQL Server shutting
It has already been said many times that (a) std::vector is preferred to c-style arrays, and (b) Arrays, vectors, and other data structures should preferably be passed by reference.While this
The following code explains how to make a class that is final, meaning that it cannot be derived further. class FinalBase{ FinalBase() {} friend class Final;};class Final : private virtual
Fixed-size arrays in local variables use a stack-allocated descriptor as expected, but all the data for an array is allocated on the heap. However, fixed-size arrays embedded in structures are
In Microsoft Access, you can execute a parameterized query that uses other parameterized queries, as long as their parameter names are the same. Save these queries in an Access database: