[Chapter 5] 5.17 PLVlog: Logging Facility

5.17 PLVlog: Logging Facility

The PLVlog (PL/Vision LOGging) package provides a powerful, generic logging facility for PL/SQL packages. See Chapter 21, PLVlog and PLVtrc: Logging and Tracing for details.

c_file CONSTANT VARCHAR2(100) := 'PLV.log';: The default name of the file contains the PL/Vision log when writing to an operating system file. This can be -- and usually would be -- overridden with your own file name. It is only applicable if you are using PL/SQL Release 2.3 or above.
c_noaction CONSTANT PLV.plsql_identifier%TYPE := '*NO ROLLBACK*';: Name for rollback activity to not perform any rollback.
c_none CONSTANT PLV.plsql_identifier%TYPE := '*FULL*';: Name to indicate that a full rollback should occur.
c_default CONSTANT PLV.plsql_identifier%TYPE := '*DEFAULT*';: Name to indicate that a rollback should occur to the default savepoint.
c_last CONSTANT PLV.plsql_identifier%TYPE := '*PLVRB-LAST*';: Name to indicate that a rollback should occur to the last savepoint recorded by PLVrb.
c_PLVlogsp CONSTANT PLV.plsql_identifier%TYPE :=
'PLVlog_savepoint';: The default savepoint issued after a write to the log.

PROCEDURE turn_on;: Turns on the logging activity; calls to put_line write information to the log (default).
PROCEDURE turn_off;: Turns off the log mechanism.
FUNCTION tracing RETURN BOOLEAN;: Returns TRUE if the log is active.

PROCEDURE sendto
(type_in IN VARCHAR2, file_in IN VARCHAR2 := NULL);: Generic program to indicate the type of log (the repository to which information will be sent). The valid types are stored in the PLV package. If you choose PLV.file , you need to also provide a file name. You can also set the log type by calling one of the following procedures.
PROCEDURE to_pstab;: Requests that the information be sent to a PL/SQL table.
PROCEDURE to_dbtab;: Requests that the information be sent to a database table.
PROCEDURE to_file (file_in IN VARCHAR2);: Requests that the information be sent to an operating system file.
PROCEDURE to_stdout;: Requests that the information be sent to standard output.
FUNCTION logtype RETURN VARCHAR2;: Returns the current log target type. This type will be one of the repository constants defined in the PLV package.

PROCEDURE put_line
(context_in IN VARCHAR2,
code_in IN INTEGER,
string_in IN VARCHAR2 := NULL,
create_by_in IN VARCHAR2 := USER,
rb_to_in IN VARCHAR2 := c_default,
override_in IN BOOLEAN := FALSE);: Writes a line to the PLVlog repository. This version of put_line allows you to specify a full set of values for the log record.
PROCEDURE put_line
(string_in IN VARCHAR2,
rb_to_in IN VARCHAR2 := c_default,
override_in IN BOOLEAN := FALSE);: This version of put_line keeps to an absolute minimum what you have to/want to provide to write a line to the log.

PROCEDURE get_line
(row_in IN INTEGER,
context_out OUT VARCHAR2,
code_out OUT INTEGER,
string_out OUT VARCHAR2,
create_by_out OUT VARCHAR2,
create_ts_out OUT DATE);: Reads a row from the PL/SQL table log, parses the contents, and returns the individual values in the separate OUT arguments of the parameter list.
PROCEDURE display (header_in IN VARCHAR2 := 'PL/Vision Log');: Displays the contents of the current PLVlog log (either in the database table or in the PL/SQL table).

PROCEDURE clear_pstab;: Empties the PL/SQL table associated with the PLVlog mechanism.
FUNCTION pstab_count RETURN INTEGER;: Returns the number of rows filled in the PLVlog PL/SQL table.
PROCEDURE set_dbtab
(table_in IN VARCHAR2 := 'PLV_log',
context_col_in IN VARCHAR2 := 'context',
code_col_in IN VARCHAR2 := 'code',
text_col_in IN VARCHAR2 := 'text',
create_ts_col_in IN VARCHAR2 := 'create_ts',
create_by_col_in IN VARCHAR2 := 'create_by');: Determines which database table is to be used by PLVlog for logging. PLVlog relies on dynamic SQL , so you can at runtime specify the table and column names for this table.
PROCEDURE fclose;: Closes the operating system file if you have chosen a file for the log repository.
PROCEDURE ps2db;: Transfers contents of PL/SQL log to the PLVlog database table.

PROCEDURE do_rollback;: Turns on the issuing of a ROLLBACK before an INSERT into the log.
PROCEDURE nodo_rollback;: Turns off the issuing of a ROLLBACK before an INSERT into the log.
FUNCTION rolling_back RETURN BOOLEAN;: Returns TRUE if PLVlog is issuing a ROLLBACK before an INSERT.
PROCEDURE rb_to (savepoint_in IN VARCHAR2 := c_none);: Sets the default savepoint used both for the ROLLBACK command before a log insert and the SAVEPOINT command after the log insert.
PROCEDURE rb_to_last;: Sets the savepoint used both for the ROLLBACK command before a log insert to the last savepoint known to PLVrb.
PROCEDURE rb_to_default;: Sets the default savepoint used both for the ROLLBACK command before a log insert to the PLVlog default savepoint.
PROCEDURE set_sp (savepoint_in IN VARCHAR2);: Sets the name of the savepoint to be set after the call to put_line to write a line to the log.


5.16 PLVlex: Lexical Analysis		5.18 PLVlst: List Manager