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Cancels a query before all rows are fetched
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Old Oracle Call Interface Functions (Oracle 7 and Earlier)
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Routine OCIHandleAlloc() OCIHandleFree() OCIAttrGet() OCIAttrSet()
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TABLE 19-7
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Function Allocates a handle for use Frees a handle previously allocated Retrieves a particular attribute of a handle Sets the value of a particular handle attribute
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The initialization and connection sequence for OCI parallels those already illustrated for CLI/ODBC and dblib. The OCI routines associated with connection management are shown in Table 19-8. An application program first calls OCIInitialize() to initialize the Oracle Call Interface. This call also indicates whether OCI will be used in multithreaded mode, whether the application program will use OCI object-mode functions, and other options. After initialization, the application program calls OCIEnvInit() to initialize an environment handle. As with CLI/ODBC, all OCI interactions take place within the context of the environment defined by this handle. After these initial steps, most applications call OCILogon() to establish a session with an Oracle database server. Subsequent OCI calls take place within the context of this session and use the supplied user-id to determine their privileges within the Oracle database. A call to OCILogoff() terminates the session. The other calls provide more advanced session management for multithreaded and multiconnection applications. The OCIServerVersion() call can be used to determine the version of the Oracle server software. The OCIPasswordChange() call can be used to change an expired password. When connection pooling is used, the application can call OCIConnectionPoolCreate() to establish a connection pool, followed by OCILogon2() to create sessions within the connection pool. When the connection pool is no longer needed, OCIConnectionPoolDestroy() can be used to destroy it.
Routine OCIInitialize() OCIEnvInit() OCIConnectionPoolCreate() OCIConnectionPoolDestroy() OCILogon() OCILogon2() OCILogoff() OCIServerAttach() OCIServerDetach() OCIServerVersion() OCISessionBegin() OCIPasswordChange() OCISessionEnd()
TABLE 19-8
Function Initializes the Oracle Call Interface for use Establishes an environment handle for OCI interaction Initializes the connection pool Destroys the connection pool Connects to an Oracle database server for an OCI session Gets a session either a new session or a virtual one from an existing session pool or connection pool 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
OCI Initialization and Connection Management Routines
19:
SQL APIs
Statement Execution
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.
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)
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