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How does Oracle act as ODBC and give examples of front end uses with ODBC?
ODBC achieve portability at the level of the executable by introducing an extra level of indirection. All direct interaction with a specific DBMS happens through a DBMS- specific driver. A driver is a software program that translates the ODBC calls into DBMS- specific calls. Drivers are loaded dynamically on demand since the DBMSs the application is going to access are known only at run-time. Available drivers are registeredwith a driver manager. The Oracle database driver translates the SQL commands from the application into equivalent commands that the Oracle DBMS understands and takes the result from the DBMS and translate into equivalent form for the application.
Example: Let there be a DSN named EMPLOYEE through, which we want to access theOracle database in Visual Basic. Dim CN As New ADODB.Connection Dim RS As New ADODB.Recordset CN.Open "DSN=employee", "scott", "tiger"
Write short notes on data ware housing? Data ware housing applications needs the transformation of data from many sources into a cohesive reliable step set of data configured a
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OBJECTIVES After going through this unit you should be capable to: Explain the File Based system and its limitations; Explain the structure of DBMS; Explain the
Ask Write the SQL code that will create the table structure for a table named EMP _1. This table is a subset of the EMPLOYEE table. The basic EMP_1 table structure is summarized in
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