A brief introduction to the ADO object Model
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ADO object model, which is the abbreviation of ActiveX Data Objects, is a new database access technology. Compared with DAO in VB5.0, it has a more simplified object model and provides a consistent interface to access both local and remote data. As far as I'm concerned, ADO is really much easier to use than DAO.
Today I will only talk about the object model of ADO. Ado defines a programmable collection of objects. for ADO object model, I think the more important thing is: Command,Connection,Recordset object. Although strictly speaking, this is not accurate, but it is true according to my practical experience. Let's talk about it separately.
(1) Connection object
The Connection object is used to establish a connection to the database. The data source can be accessed from the application through the connection. It stores connection information such as pointer type, connection string, query timeout, connection timeout, and default database.
(2) Command object
After establishing the Connection, you can issue a command to manipulate the data source. In general, the ADO object model can add, delete, or update data in a database, or query data in a table. Command objects are useful when defining query parameters or executing a stored procedure with output parameters.
(3) Recordset object
The Recordset object represents only a recordset, which is a table in a connected database, or a recordset returned by the execution result of a Command object. In the ADO object model, is the most important way to check and modify data in rows, almost all operations on the data are completed in the Recordset object. Record object is used to specify rows, move rows, add, change, and delete records.
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