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Method get_status returns the current status for the associated process from its status table. FUNCTION get_status retrieves the one, and only, row from the table, and then returns the value of column status. Here s an example of the method from table package POLLING_PROCESS_STATUSS: FUNCTION get_status return POLLING_PROCESS_STATUS.status%TYPE is v_status POLLING_PROCESS_STATUS.status%TYPE; begin select status into v_status from POLLING_PROCESS_STATUS; return v_status; exception when NO_DATA_FOUND then return 'UNKNOWN'; when OTHERS then raise_application_error(-20001, SQLERRM|| ' on select POLLING_PROCESS_STATUS'|| ' in POLLING_PROCESS_STATUSS.get_status()'); end get_status; And finally, our last polling process method: status.
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Since we are in such a commanding (or demanding) mood with this section, status is a convenience method that exists in the polling process s package that executes method get_status from the table package for the status table. Once again, it exists in the polling process package because it s simply more intuitive to execute commands for a given process from its own package. Here s an example from polling process package POLLING_PROCESS: PROCEDURE status is begin pl(POLLING_PROCESS_STATUSS.get_status); end status; With the queue and status tables and their associated table packages in place, you can now tell the polling process to do the following: Quit Enable debug logging
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CHAPTER 10 FAIRY TALES
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Disable debug logging Process a given command Display its current status A common use for on-demand or polling processing is to build interfaces between systems. Let s discuss some common method names used for just that next.
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Interfacing, systems integration, or whatever you want to call it, is just data processing. It is commonly a multistep data process (MSDP) that follows a fairly standard set of tasks: 1. Log that you are going to attempt to download data from a source to your target system. 2. Download data from the source to your target system. 3. Log that you downloaded the data successfully. 4. Verify that you have cross-reference values for all mapped fields. 5. Upload data from its staging tables to its target tables. 6. Log that you uploaded the data successfully. As you can see, interfacing consists of two high-level steps: downloading and uploading (for lack of better terms). Figure 10-7 shows a visual representation of this division of tasks. These steps can be accomplished synchronously or asynchronously. Regardless, I like to separate the major steps by recording their success or failure in a status table. This allows me to rerun the process, as needed, until both steps are completed.
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Database Link C/C++ JDBC Staging Tables
Oracle
PL/SQL Application Tables
File System
SQL*Loader XML
Downloading
Uploading
Figure 10-7. Interfacing with external systems, two steps: downloading and uploading
CHAPTER 10 FAIRY TALES
Whether or not I use a program external to the database to move data from a source to destination staging tables, the download program can record when it starts its processing and when it completes. Then when the upload process starts, it can check to see if the download process has been completed. If the download has been completed, the upload process can log when it starts and when it completes. Dividing a long-running process into multiple smaller processes like this not only allows you to do asynchronous processing, but also provides you with a framework to build robust processes that can be rerun over and over again until they finish their processing. For example, if you build an interface with multistep processing that should move data into your database once a week, it can be scheduled to run every day of the week with cron or Scheduled Tasks, and it will just quit if the weekly work has already been completed. Here, I ll discuss commonly used method names for a multistep interface on-demand process. Let s start with process.
process
Again, process is used to start an on-demand or polling process. In this case, a multistep data process. A multistep process is one that checks which portion of a process needs to be done and (re)starts the process at the required step. A multistep process is dependent on a status table that is used to record when a step is completed successfully. The following is an example of a multistep process that you can find in package WEEKLY_INTERFACE: PROCEDURE process is begin if not WEEKLY_INTERFACE_STATUSS.is_downloaded() then download(); if not WEEKLY_INTERFACE_STATUSS.is_downloaded() then pl('WARNING: download() did not complete successfully.'); end if; end if; if WEEKLY_INTERFACE_STATUSS.is_downloaded() then if not WEEKLY_INTERFACE_STATUSS.is_uploaded() then upload(); if not WEEKLY_INTERFACE_STATUSS.is_uploaded() then pl('WARNING: upload() did not complete successfully.'); end if; end if; end if; pl('process() completed successfully.'); end process;
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