是否可以在执行包中的过程时向用户显示注释。我的包裹有 3 个程序。我一个接一个地打电话。我想在控制台上显示注释，例如程序 xyz 正在执行，程序成功执行。我在程序中添加了评论，例如DBMS_OUTPUT.PUT_LINE('PROCEDURE EXECUTED SUCCESSFULLY')但对我没有用。仅供参考，我在 Windows 7 系统中使用 oracle 11g。
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You can't use DBMS_OUTPUT to display information on a procedure while it is running. This is because DBMS_OUTPUT.put_line doesn't display data on screen, rather, the data is put in a queue that is later read by the calling client (This queue is also invisible outside of its transaction). If you use SQL*Plus the queue is read and displayed automatically at the end of the procedure if you have SET SERVEROUTPUT ON.
Other means exist to follow the progress of a procedure while it is running:
- You could write to a file instead.
UTL_FILE.put_linewill write directly if the parameterautoflushis set to true. - You could set session variables with
DBMS_APPLICATION_INFO. These variables can be read with another session by queryingv$session. - You could use
AUTONOMOUS_TRANSACTIONSto log progress information in a dedicated table. This table can be queried by another session simultaneously.
As you can see you would need another process to read the information while it is written. In some applications, this would be achieved by running the main batch job in a new separate process, for example by calling DBMS_JOB or DBMS_SCHEDULER while the calling transaction loops on the progress table or file until the job is complete.
SQL*Plus is not an interactive client, you will need some more sophisticated environment to achieve this functionality.
于 2012-09-04T08:54:34.103 回答