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(Remote Data Objects) is an object-oriented data access interface to ODBC combined with the easy-to-use style of DAO, providing an interface that exposes virtually all of ODBCs low-level power and flexibility.
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DAO is suited best for either single-system applications or for small, local deployments. You can use ADO with any COM-compliant programming language such as Visual Basic, Visual C++, or Java.DAO (Data Access Objects) was the first object-oriented interface that exposed the Microsoft Jet database engine (used by Microsoft Access) and allowed Visual Basic developers to directly connect to Access tables - as well as other databases - through ODBC.
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In our case, its the interface between the ASP code and the OLE-DB provider. Set the RecordSource property of the ADO Data ControlIn the properties window of the ADO Data controls choose the RecordSource property.Choose a Command TypeadCmdUnknownadCmdTableadCmdTextadCmdStoredProcSelect a table or enteran SQL statementĬreating Bound ControlsMany different controls that can hold text and graphics can be bound to a field in an ADO Data control.Set the DataSource property of the bound control to the ADO Data Control.Set the DataField property of the bound control to the field you want to displayĮach OLE-DB data provider is a unit of code, written in a language such as C++ or Java which uses OLE-DB objects to provide the instructions required to communicate and pass data between the data store and the data provider.ĪctiveX Data Objects (ADO) sits between the application itself and the OLE-DB layer. Using the ADO Data ControlAdd the Microsoft ADO Data Control 6.0 (OLEDB) component to your project.Create an instance of the ADO Data Control on your form.Connect to a database with the ADO Data Control by building a connection string.Set the RecordSource property of the ADO Data Control Create bound controls on your form.īuilding a Connection StringIn the properties window of the ADO Data controls choose the ConnectionString property.3 MethodsFrom the property pages, choose Use Connection String and choose BuildFrom the Provider tab in the Data Link Properties dialog box, specify which data provider to use.use Microsoft Jet 4.0 OLE DB Provider for Access databaseschoose Next > to bring up the Connection tab of the Data Link Properties dialog boxīuilding a Connection StringThree methodsUse a data Data Link FileUse an ODBC Data Source NameUse a Connection StringBackīuilding a Connection StringFrom the Connection tab, enter your database name and path (or browse for it)Leave the default log on informationTest Connection The ADO Object ModelFour main objects:Connection the link between the program and the data storeCommand allows you to run commands against the data storeRecordset contains all the data returned from a specific action on the data storeStream allows the manipulation of data held in web resources, such as HTML files For new projects, you should use ADO as your data access interface. It features a simpler yet more flexible object model than either RDO or DAO.
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OLE-DBApplicationOLE-DBProviderOLE-DBProviderOLE-DBProviderOLE-DBProviderOLE-DBProviderODBCDataAccessSQLServerOracleExcelODBCADOĪDO, DAO and RDO in Visual BasicIn Visual Basic, three data access interfaces are available to you:ActiveX Data Objects (ADO) Remote Data Objects (RDO) Data Access Objects (DAO)Data access technology is constantly evolving, and each of the three interfaces represents a different stage of development for data access technology. Universal Data AccessOpen Database Connectivity (ODBC)standard for accessing data in databasesOLE-DBallows access to data in many formatsfaster and easier to use than ODBC