The number of bytes or characters actually read is returned in the amount parameter. If the input offset points past the End of LOB , then amount is set to 5, and a NO_DATA_FOUND exception is raised.
Using Python With Oracle Database 11g
A subprogram can contain several RETURN statements. The subprogram does not have to conclude with a RETURN statement. Executing any RETURN statement completes the subprogram immediately.
Pass SQL WHERE clause to Oracle stored procedure
The statement contains a bind variable :id. The statement is only prepared once but executed twice with different values for the WHERE clause.
All files opened during a user session are implicitly closed at the end of the session. However, Oracle strongly recommends that you close the files after both normal and abnormal termination of operations on the BFILE.
If you do not wrap the LOB operation inside the OPEN/CLOSE , the functional and domain indexes are updated each time you write to the LOB. This can adversely affect performance. Therefore, it is recommended that you enclose write operations to the LOB within the OPEN or CLOSE statement.
The declarative part contains local declarations, which are placed between the keywords IS and BEGIN. The keyword DECLARE is not used. The executable part contains statements, which are placed between the keywords BEGIN and EXCEPTION (or END ). One or more RETURN statements must appear in the executable part of a function. The exception-handling part contains exception handlers, which are placed between the keywords EXCEPTION and END.
A copy of a temporary LOB is created if the user modifies the temporary LOB while another locator is also pointing to it. The locator on which a modification was performed now points to a new copy of the temporary LOB. Other locators no longer see the same data as the locator through which the modification was made. A deep copy was not incurred by permanent LOBs in these types of situations, because CR snapshots and version pages enable users to see their own versions of the LOB cheaply.
The registerquery() call registers a query that selects everything from the MYTAB table. Any change to the table that is an UPDATE or DELETE will cause DCNCallback() to be called. The MYTAB table was created in a previous section of the lab.
Figure 8-6 shows how the PL/SQL compiler resolves subprogram calls. When the compiler encounters a procedure or function call, it tries to find a declaration that matches the call. The compiler searches first in the current scope and then, if necessary, in successive enclosing scopes. The compiler looks more closely when it finds one or more subprogram declarations in which the subprogram name matches the name of the called subprogram.
Pass the DIRECTORY object and the filename of the external LOB you are adding to the BFILENAME function to create a LOB locator for your external LOB.