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Overview of Oracle Objects for OLE (OO4O)

to SQL and PL/SQL statements of other objects (as noted in the object descriptions), by using the parameter name as a placeholder in the SQL or PL/SQL statement. Such use of parameters can simplify dynamic queries and increase program performance.

OraParamArray

An OraParamArray object represents an array-type bind variable in a SQL statement or PL/SQL block, as opposed to a scalar-type bind variable represented by the OraParameter object.

OraParamArray objects are created, accessed, and removed indirectly through the

OraParameters collection of an OraDatabase object. Each OraParamArray object has an identifying name and an associated value.

OraSQLStmt

An OraSQLStmt object represents a single SQL statement. Use the CreateSQL method to create an OraSQLStmt object from an OraDatabase object.

During create and refresh, OraSQLStmt objects automatically bind all relevant, enabled input parameters to the specified SQL statement, using the parameter names as placeholders in the SQL statement. This can improve the performance of SQL statement execution without re-parsing the SQL statement.

The OraSQLStmt object can be used later to execute the same query using a different value for the :SALARY placeholder. This is done as follows (updateStmt is the OraSQLStmt object here):

OraDatabase.Parameters("SALARY").value = 200000 updateStmt.Parameters("ENAME").value = "KING" updateStmt.Refresh

OraAQ

An OraAQ object is instantiated by invoking the CreateAQ method of the OraDatabase interface. It represents a queue that is present in the database.

Oracle Objects for OLE provides interfaces for accessing Oracle Advanced Queuing (AQ) feature. It makes AQ accessible from popular COM-based development environments such as Visual Basic. For a detailed description of Oracle Advanced Queuing, refer to Oracle Streams Advanced Queuing User's Guide and Reference.

1-36 Oracle Database Application Developer's Guide - Fundamentals

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