birt code 128

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exec dbms_schedulercreate_chain(chain_name=>'mychain'); exec dbms_schedulerdefine_chain_step(chain_name => 'mychain',step_name => 'step1',program_name => 'prg1'); exec dbms_schedulerdefine_chain_step(chain_name => 'mychain',step_name => 'step2',program_name => 'prg2'); exec dbms_schedulerdefine_chain_step(chain_name => 'mychain',step_name => 'step3',program_name => 'prg3'); exec dbms_schedulerdefine_chain_rule(chain_name => 'mychain',rule_name => 'rule1',condition => 'step1 succeeded',action => 'start step2'); exec dbms_schedulerdefine_chain_rule(chain_name => 'mychain',rule_name => 'rule2',condition => 'step1 failed',action => 'start step3'); exec dbms_schedulerenable('mychain');

These commands create and enable a very simple chain of three steps The execution of either the second or third step is dependent on the outcome of the first step The syntax for creating rules permits the use of keywords such as SUCCEEDED and FAILED, which will test the outcome of another step Figure 22-6 shows the result of running the preceding code, as seen through Database Control To launch the chain, you must create a job This could be based on a schedule, or an event This job will run the chain on the last Tuesday of alternate months:

Photoshop ships with some additional preset libraries in its Presets folder Have fun experimenting with the different tool settings in these libraries by choosing the library s name from the button of the flyout menu in the Preset Manager

exec dbms_schedulercreate_job(job_name=>'run_mychain',job_type=>'chain',job_action=>'mychain',start_date=>next_day(last_day(sysdate)-7,'tuesday'),repeat_interval=>'freq=monthly;interval=2',enabled=>true);

Creating and launching a job involves a certain amount of activity within the data dictionary This may make it impossible to create a large number (perhaps hundreds) of jobs in a short time (perhaps a few seconds) To get around this problem, it is possible to create lightweight jobs A lightweight job is a simpler construct than a regular job It must be based on a program, and can have only a limited range of attributes: for example, AUTO_DROP is always TRUE A lightweight job can be created individually, but there is little value in this The real value comes with the ability to create an array of job definitions (perhaps hundreds) and submit them all simultaneously

Figure 22-6

Photoshop 7 s Pattern Maker command makes it easy to create patterns out of any part of an image For example, I recently wanted to fill part of a design with an abstract pattern based on the American flag While I certainly could have tried creating this pattern by hand, Pattern Maker was able to give me a wide variety of patterns to choose from based on this theme in no time at all

TIP It is not possible to create lightweight jobs with Database Control; the option is not visible in any of the windowsYou must therefore use the DBMS_ SCHEDULER API To create a single lightweight job, use a version of the CREATE_JOB procedure call that specifies a program and set the JOB_STYLE argument to LIGHTWEIGHT For example:

SQL> exec dbms_schedulercreate_job(> job_name=>'lw21',program_name=>'prg1',> enabled=>true,job_style=>'lightweight',> end_date=>to_timestamp(sysdate+1),repeat_interval=>'freq=hourly');

This will create a lightweight job that will run the program PRG1 every hour for the next 24 hours Study the code in Figure 22-7, which creates and executes an array of 100 lightweight jobs

To use Pattern Maker, you first need to open an image in Photoshop on which to base your pattern So when I wanted to create a pattern based on the American flag, I opened the following image from Photodisc (wwwgettyimagescom/photodisc):

Figure 22-7

The following table describes each line in the anonymous PL/SQL block in Figure 22-7

Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Lines 8 & 9 Line 10 Line 11 Line 12 Line 13 Line 14 Define a variable named LW_JOB of type SYSJOB Define an array of LW_JOBs Begin the executable code Initialize the array using the SYSJOB_ARRAY function Extend the array to 100 elements Open a loop, to be iterated 100 times Populate the LW_JOB variable with values that will create an enabled lightweight job named by the loop counter and using the program PRG1 Insert the new job into the array Close the loop Create all the jobs defined in the array, in a single transaction End the executable code Run anonymous block