ADO is a Microsoft tool for accessing databases and other data sources. It acts as a layer between programming languages and data objects, making it easier for developers to write programs without knowing how the database is set up. ADO includes 12 object types, including connection, command, recordset, and error.
Microsoft® ActiveX® Data Objects, or ADO, is a tool used to access databases or other data sources. It is a form of Component Object Model (COM) objects designed by Microsoft® to help components written in different programming languages work together. ADO is part of a group of tools generally referred to as COM products.
ActiveX® Data Objects increase flexibility for database developers and for programming functions that use these data objects. It acts as a layer between the programming language and any means used to access data objects. This means that the developer can write a program that accesses data objects without needing to know how the database is set up. No knowledge of SQL is required to access data objects when ActiveX® is used, although ADO can be used to execute SQL commands.
There are four collections of ActiveX® Data Objects: fields, properties, parameters and errors. Fields are collections of objects that correspond to a given record or recordset under a particular column heading. Properties are objects that describe the characteristics of a certain object. Parameters are an aspect of Command objects that determine if and how the behavior of the Command object will change. Errors are a collection of any provider-created errors that occur during an ActiveX® operation.
ActiveX® Data Objects include 12 object types: connection, command, recordset, immediate, batch, transaction, record, flow, parameter, field, property, and error. Connection data objects store information about how the data connection was created and managed. The Command object is a set of instructions that are sent to the database regarding the requested information. A Field object is a column of data of the same data type. A Record object is a collection of Field objects, and a collection of Records is a Recordset object.
The Recordset is the result of the combined records and fields that correspond to the properties that have been queried on the database. The information in a Recordset object can be a simple list or a subset of information from the data table that corresponds to the filters used to form the request. Once created, the Immediate and Batch data objects describe if and how a recordset is locked. The Transaction data object, when allowed, starts and ends a data transaction.
Stream data objects are used within a Recordset object to read or write a stream of bytes. The Parameter data object determines the operation of a procedure based on the required action. Error data objects become part of the error collection. Property data objects define an ability deemed necessary by the provider.
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