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OCIDescriptorAlloc() OCIDescriptorFree() OCIParamGet() OCIParamSet()
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Allocates a descriptor or LOB locator Frees a previously allocated descriptor Gets a descriptor for a parameter Sets a parameter descriptor in a complex object-retrieval handle
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Table 19-11.
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OCI Descriptor Management Routines
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Application programs use the functions shown in Table 19-12 to implement SQL transaction management. The OCITransCommit() and OCITransRollback() calls provide the basic capability to commit and roll back transactions, and correspond to the usual SQL COMMIT and ROLLBACK statements. The other functions provide a very rich and complex transaction scheme, including the specification of read-only, serializable, and loosely or tightly coupled transactions, and control over distributed transactions. The transaction management routines take a service context handle that identifies a current connection as an input parameter.
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Error Handling
The OCI functions return a status code indicating whether they completed successfully. In addition, most OCI functions accept an error handle as an input parameter. If an error occurs during processing, error information is associated with this handle. Upon return from the function, the application program can call OCIErrorGet() on the error handle to obtain further information about the error, including the error number and error message.
Catalog Information
The OCIDescribeAny() call provides access to Oracle system catalog information. An application program calls this routine with the name of a table, view, synonym, stored procedure, data type, or other Oracle schema object. The routine populates a descriptor (identified by a descriptor handle) with information about the attributes
Routine
OCITransCommit() OCITransRollback() OCITransStart() OCITransPrepare() OCITransForget() OCITransDetach() Table 19-12.
Function
Commits a transaction Rolls back a transaction Initiates or reattaches a special transaction Prepares to commit for a distributed transaction Forgets a previously prepared transaction
PROGRAMMING WITH SQL
Detaches a distributed transaction
OCI Transaction Management Routines
SQL: The Complete Reference
of the object. Subsequent calls to OCIAttrGet() on the descriptor handle can be used to obtain complete data about the object at runtime.
Large Object Manipulation
OCI includes a large group of routines, shown in Table 19-13, for processing Oracle large object (LOB) data types and large objects stored in files referenced in Oracle columns. Because large objects may be tens of thousands to millions of bytes in length, they typically cannot be bound directly to application program buffers in their entirety. Instead, OCI uses a LOB locator, which functions like a handle for the LOB data item. The locator is returned for LOB data in query results and used as an input parameter for LOB data being inserted or updated. The LOB handling routines support piece-by-piece processing of LOB data, allowing it to be transferred between an Oracle database and an application program. The routines accept one or more LOB locators as parameters.
Routine
OCILobRead() OCILobWrite() OCILobAppend() OCILobErase() OCILobTrim() OCILobGetLength() OCILobLocatorIsInit() OCILobCopy() OCILobAssign() OCILobIsEqual() OCILobFileOpen() OCILobFileClose() OCILobFileCloseAll() Table 19-13.
Function
Reads a piece of a LOB into application program data area Writes data from an application program data area into a LOB Appends data to the end of a LOB Erases data within a LOB Truncates data from the end of a LOB Obtains the length of a LOB Checks whether a LOB locator is valid Copies data from one LOB to another Assigns one LOB locator to another Compares two LOB locators Opens a file containing LOB data Closes a previously opened LOB file Closes all previously opened LOB files
OCI Large Object Processing Routines
19:
SQL APIs
Routine
OCILobFileIsOpen() OCILobFileGetName() OCILobFileSetName() OCILobFileExists() OCILobLoadFromFile() Table 19-13.
Function
Checks whether a LOB file is open Obtains the name of a LOB file, given a LOB locator Sets the name of a LOB file in a LOB locator Checks if a LOB file exists Loads a LOB from a LOB file
OCI Large Object Processing Routines (continued)
Java Database Connectivity (JDBC)
JDBC is a callable SQL API for the Java programming language. JDBC is both the official and de facto standard for SQL database access from Java. For the C programming language, the DBMS vendors developed their own proprietary APIs well before the development of ODBC or SQL-CLI API. For Java, the JDBC API was developed by Sun Microsystems as part of a suite of Java APIs, embodied in various Java editions. As a result, all of the major DBMS products provide Java support via JDBC; there are no important competing APIs.
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