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OCIInitialize() OCIEnvInit() OCILogon() OCILogoff() OCIServerAttach() OCIServerDetach() OCIServerVersion() OCISessionBegin() OCIPasswordChange() OCISessionEnd() Table 19-8.
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Initializes the Oracle Call Interface for use Establishes an environment handle for OCI interaction Connects to an Oracle database server for an OCI session Terminates a previous logon connection Attaches to an Oracle server for multisession operations Detaches from an Oracle server Returns server version information Begins a user session on a previously attached server Changes a user s password on the server Ends a previously begun user session
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The OCI functions shown in Table 19-9 implement SQL statement execution. OCIStmtPrepare() and OCIStmtExecute() support the two-step prepare/execute process. The OCIStmtExecute() function can also be used to describe query results (similar to the embedded SQL DESCRIBE statement) without actually executing the query by passing a specific flag. OCI automatically provides a description of query results when OCIStmtExecute() is called in the normal statement execution mode. The description is available as an attribute of the statement handle for the executed query. The OCIBindbyPos() and OCIBindbyName() functions are used to bind application program locations to statement parameters, using either parameter positions or parameter names. These calls automatically allocate bind handles for the parameters when they are called, or they may be called with explicitly allocated bind handles. The other calls implement more advanced binding techniques, including binding of multiple parameter values (arrays) and binding of complex object data types. They also provide execute-time parameter (and query results) processing, corresponding to the deferred parameter mode supported by CLI/ODBC and described earlier in the CLI Statement Processing section. The piece info calls support this mode of operation.
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19:
SQL APIs
Routine
OCIStmtPrepare() OCIStmtExecute() OCIBreak() OCIBindbyPos() OCIBindbyName() OCIStmtGetBindInfo() OCIBindArrayOfStruct() OCIBindDynamic() OCIBindObject() OCIStmtGetPieceInfo()
Function
Prepares a statement for execution Executes a previously prepared statement Aborts current OCI operation on a server Binds a parameter based on its position Binds a parameter based on its name Obtains the names of bind and indicator variables Sets up array binding for passing multiple parameter values Registers a callback routine for a previously bound parameter that will use runtime binding Provides additional information for a previously bound parameter with a complex object data type Obtains information about a dynamic piecewise parameter value needed at execute-time by OCI (or a dynamic piecewise query results column being returned) Sets information (buffer, length, indicator, etc.) for a dynamic piecewise parameter value being supplied at execute-time to OCI (or a dynamic piecewise query results column being accepted at runtime)
OCIStmtSetPieceInfo()
Table 19-9.
OCI Statement-Processing and Parameter-Handling Routines
Query Results Processing
The OCI functions shown in Table 19-10 are used to process query results. The OCIDefineByPos() function is used to bind a query results column (identified by column number) to an application program storage location. (The OCI terminology refers to this as the define process; the term binding is reserved for input parameters.) The other define calls support dynamic (execute-time) binding, array binding (for multirow fetch operations), and binding of complex object data types. The OCIStmtFetch() call retrieves a row of query results, and provides the SQL FETCH statement functionality.
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Routine
OCIStmtFetch() OCIDefineByPos() OCIDefineArrayofStruct() OCIDefineDynamic() OCIDefineObject()
Function
Fetches a row or rows of query results Binds a query results column Sets up array binding for multirow results retrieval Registers a callback routine for dynamic processing of query results column Provides additional information for a previously bound query results column with a complex object type
Table 19-10.
OCI Query Results Processing Routines
Descriptor Handling
OCI uses descriptors to provide information about parameters, Oracle database objects (tables, views, stored procedures, and so on), large objects, complex objects, row-ids, and other OCI objects. A descriptor provides information to the application program and is used in some cases to manage the details of the processing of these objects. The routines shown in Table 19-11 are used to manage descriptors. They allocate and free the descriptors and retrieve and set individual data values within the descriptors.
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