Where can I find Jet? However, the driver is no longer included with MDAC. The driver is not included with MDAC 2. Some of these enhancements cause small behavior changes. These enhancements include improvements to Watson behavior and to tracing functionality. For more information about changes in MDAC 2. SQL Server 7. If you install MDAC 2. For more information, click the following article number to view the article in the Microsoft Knowledge Base:. Windows rollback: On a computer that is running Windows 98 or Windows Millennium Edition, if you try to roll back your MDAC installation to an earlier version, the computer is left in a mixed state where your files are not all from the same version of MDAC.
This behavior occurs because of a problem with the setup technology that is included with Windows 98 and Windows Millennium Edition. Open , Recordset. Save , Stream. SaveToFile , and Stream. LoadFromFile operate on physical files only. These methods now verify that file handles point to physical files only. This prevents the Command object from being misused. The number of Recordsets returned by a nested Shape command has an upper bound.
A nested shape command now returns a maximum of Recordsets. This means that a Shape command can no longer be nested at any depth. Instead, the maximum level depth is , if each command results in a single child Recordset. It is represented by a key named Data Source. To specify it, you can assign the name of the database with its extension to the Data Source factor. If you provide only the name of the database, the database engine would look for it in the same folder as the application that called it.
In the above example, the database engine may look for it in the My Documents folder. If you want to refer to a database that is outside of the folder of the application that called this method, provide a complete path of the database. This can consist of the drive, the folder s , and the name of the database with its extension.
If you are referring to a contemporary or later database, specify the extension as. If you are referring to a database compatible with previous versions of Microsoft Access, specify the extension as. Of course, you can create the string using any of the appropriate techniques you want.
The connection allows you to create a connection to either the database you are working on or another database that may be currently closed. You must know the path to the database you want to access. In some cases, you may simply want to connect to the current database. To support this, the CurrentProject property of the Application object is equipped with a property named Connection.
This gives you a convenient access to the connection of the currently opened database. Here is an example of invoking it:.
Remember, after using a connection, you should release the resources it was using. When this code executes, it identifies the connection to the current database and stores it in a declared variable.
After creating a connection to a database, the next step is usually to specify what you want to do on the database. One of the most usual operations you can perform is to submit a SQL statement to it the connection. This is also equivalent to executing the statement. To let you execute a statement, the Connection class is equipped with a method named Execute. Its syntax is:. The second and the third arguments are optional. In this case, the strStatement string would be passed to the Execute method of the Connection object that would execute it.
Because the statement is created as a string and doesn't 'belong' to Microsoft Access, it will not be checked until it must be executed. This means that it is quite completely your responsibility to formulate a valid statement. Microsoft Access cannot check, and will not assist you with, the validity of the statement, until the statement executes.
When using a connection, it consumes resources that other applications may need. Therefore, after using it, you should close it and free the resources it was using so they can be made available to the other parts of the computer.
To provide you with the ability to close a connection, the Connection class is equipped with a method named Close. Therefore, to close a connection, call its Close method. Its primary benefits are ease of use, high speed, low memory overhead, and a small disk footprint. MDPs present data in multidimensional views as opposed to tabular data providers TDPs that present data in tabular views.
Remote Data Service RDS is a feature of ADO, with which you can move data from a server to a client application or Web page, manipulate the data on the client, and return updates to the server in a single round trip.
RDS client components will be removed in a future version of Windows. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. ADOX includes objects for schema creation and modification, as well as security.
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