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disable() set_text()
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Disable set_text() for the specified program unit Log the text to the debug table
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Since I m building the object-relational version, I need to create the TYPE first, the table second, and then the TYPE BODY last. Listing 7-3 is my source code for the object TYPE DEBUG_O. Listing 7-3. Type DEBUG_O s Specification, debug_o.tps 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 create type DEBUG_O as object ( /* debug_o.tps by Donald Bales on 12/15/2006 Type DEBUG_O's specification: A type for logging debug information */ id text unique_session_id insert_user insert_date -- Get the next primary key value STATIC FUNCTION get_id return -- A NULL values constructor CONSTRUCTOR FUNCTION debug_o( self in out return -- A convenience constructor CONSTRUCTOR FUNCTION debug_o( self in out ain_id in aiv_text in return -- Override the default constructor CONSTRUCTOR FUNCTION debug_o( self in out id in text in unique_session_id in insert_user in insert_date in return
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number, varchar2(256), varchar2(24), varchar2(30), date,
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nocopy debug_o) self as result,
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nocopy debug_o, number, varchar2) self as result,
nocopy debug_o, number, varchar2, varchar2, varchar2, date) self as result,
CH APT ER 7 SO JUS T WH A T S H APPENI NG H ERE
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-- Write to the debug object table STATIC PROCEDURE set_text( aiv_program_unit in aiv_text in -- A map function MAP MEMBER FUNCTION to_map return ) not final; / @se.sql Let s take a close look at Listing 7-3:
varchar2, varchar2),
number
Lines 8 through 12 declare the five attributes for the TYPE. Lines 14 and 15 declare a static function get_id() to allocate the next primary key value. Since it s a static method, the function is executed using the TYPE rather than an instance of the TYPE. Lines 17 and 18 declare a constructor that returns an instance of the TYPE initialized to NULL values. Lines 21 through 25 declare a convenience constructor that will return a fully initialized instance of the TYPE, ready to be inserted into the DEBUG_OT table. Lines 27 through 34 declare a constructor that will override the default constructor definition provided by SQL. Lines 36 through 38 declare a static procedure set_text(), which will insert an entry into the DEBUG_OT table using an autonomous transaction. This will allow me to commit the log entry without committing anything in the session where I m using this method to log debug information. Lines 40 and 41 declare a MAP method used by SQL to compare and sort objects of this TYPE. The next step in the development process is to create an object table based on the TYPE. You may have thought that I needed to code the TYPE s implementation first. In this case, I m going to reference the object table in the TYPE BODY, so I must create the table first. Listing 7-4 is the DDL for creating an object table based on TYPE DEBUG_O. Listing 7-4. DDL for Creating an Object Table Based on Type DEBUG_O, debug_ot.tab 01 02 03 04 05 06 07 08 09 rem debug_ot.tab rem by Donald Bales on 12/15/2006 rem Create debugging message table --drop table DEBUG_OT; create table DEBUG_OT of DEBUG_O tablespace USERS pctfree 0 storage (initial 1M next 1M pctincrease 0);
C H APTE R 7 SO JUST WH AT S HA PPE NIN G H ERE
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
alter table DEBUG_OT add constraint DEBUG_OT_PK primary key ( id ) using index tablespace USERS pctfree 0 storage (initial 1M next 1M pctincrease 0); drop sequence DEBUG_ID_SEQ; create sequence DEBUG_ID_SEQ start with 1 order; analyze table DEBUG_OT estimate statistics; grant all on DEBUG_OT to PUBLIC; Let s look at Listing 7-4 line by line: Lines 6 through 8 create object table DEBUG_OT based on TYPE DEBUG_O. Lines 10 through 16 create a primary key on the object table DEBUG_OT. Lines 18 through 20 declare a sequence to be used to allocate primary key values for table DEBUG_OT. On line 22, I analyze table DEBUG_OT to give the Optimizer some initial statistics to work with. On line 24, I grant all privileges to PUBLIC so anyone on the database can use the debug table facility I m creating.
Now that the table exists, I can compile the TYPE BODY without dependency errors. Listing 7-5 is the TYPE BODY for TYPE DEBUG_O. Listing 7-5. Type DEBUG_O s Implementation, debug_o.tpb 001 002 003 004 005 006 007 008 009 010 011 012 013 014 create or replace type body DEBUG_O as /* debug_o.tpb by Donald Bales on 12/15/2006 Type DEBUG_O's implementation A type for logging debug information */ STATIC FUNCTION get_id return n_id begin
number is number;
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