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The new OCI uses a hierarchy of handles to manage interaction with an Oracle database, like the handle hierarchy of the SQL/CLI described earlier in the section CLI Structures The handles are: I Environment handle. The top-level handle associated with an OCI interaction I Service context handle. Identifies an Oracle server connection for statement processing I Server handle. Identifies an Oracle database server (for multisession applications) I Session handle. Identifies an active user session (for multisession applications) I Statement handle. Identifies an Oracle-SQL statement being processed I Bind handle. Identifies an Oracle statement input parameter I Define handle. Identifies an Oracle query results column I Transaction handle. Identifies a SQL transaction in progress I Complex object handle. Retrieves data from an Oracle object I Error handle. Reports and processes OCI errors
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olon() oopen() oclose() ologof()
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Logs on to an Oracle database Opens a cursor (connection) for SQL statement processing Closes an open cursor (connection) Logs off from an Oracle database
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Basic statement processing osql3() oexec() oexn() obreak() oermsg() Prepares (compiles) a SQL statement string Executes a previously compiled statement Executes with an array of bind variables Aborts the current Oracle call interface function Obtains error message text
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Statement parameters obndrv() obndrn() Binds a parameter to a program variable (by name) Binds a parameter to a program variable (by number)
Transaction processing ocom() orol() ocon() ocof() Commits the current transaction Rolls back the current transaction Turns on autocommit mode Turns off autocommit mode
Query results processing odsc() oname() odefin() ofetch() ofen() ocan() Table 19-6. Obtains a description of a query results column Obtains the name of a query results column Binds a query results column to a program variable Fetches the next row of query results Fetches multiple rows of query results into an array Cancels a query before all rows are fetched
Old Oracle Call Interface Functions (Oracle7 and Earlier)
19:
SQL APIs
An application program manages OCI handles using the routines shown in Table 19-7. The allocate and free routines function like their SQL/CLI counterparts. The get attribute and set attribute functions operate like the similarly named SQL/CLI routines that get and set environment, connection, and statement attributes. An error handle is used to pass information back from OCI to the application. The error handle to be used for error reporting is typically passed as a parameter to OCI calls. If the return status indicates an error, information about the error can be retrieved from the error handle using OCIErrorGet().
Oracle Server Connection
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 OCIChangePassword() call can be used to change an expired password.
Routine
OCIHandleAlloc() OCIHandleFree() OCIAttrGet() OCIAttrSet() Table 19-7.
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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