如何将 DBMS_OUTPUT.PUT_LINE 的输出重定向到文件?

问题描述

我需要在 pl/sql 中调试以计算程序的次数，我想使用:

I need to debug in pl/sql to figure times of procedures, I want to use:

SELECT systimestamp FROM dual INTO time_db;
DBMS_OUTPUT.PUT_LINE('time before procedure ' || time_db);

但我不明白输出的去向以及如何将其重定向到包含我想要收集的所有数据的日志文件?

but I don't understand where the output goes to and how can I redirect it to a log file that will contain all the data I want to collect?

推荐答案

DBMS_OUTPUT 不是最好的调试工具，因为大多数环境本身并不使用它.但是，如果您想捕获 DBMS_OUTPUT 的输出，您只需使用 DBMS_OUTPUT.get_line 过程.

DBMS_OUTPUT is not the best tool to debug, since most environments don't use it natively. If you want to capture the output of DBMS_OUTPUT however, you would simply use the DBMS_OUTPUT.get_line procedure.

这是一个小例子:

SQL> create directory tmp as '/tmp/';

Directory created

SQL> CREATE OR REPLACE PROCEDURE write_log AS
  2     l_line VARCHAR2(255);
  3     l_done NUMBER;
  4     l_file utl_file.file_type;
  5  BEGIN
  6     l_file := utl_file.fopen('TMP', 'foo.log', 'A');
  7     LOOP
  8        EXIT WHEN l_done = 1;
  9        dbms_output.get_line(l_line, l_done);
 10        utl_file.put_line(l_file, l_line);
 11     END LOOP;
 12     utl_file.fflush(l_file);
 13     utl_file.fclose(l_file);
 14  END write_log;
 15  /

Procedure created

SQL> BEGIN
  2     dbms_output.enable(100000);
  3     -- write something to DBMS_OUTPUT
  4     dbms_output.put_line('this is a test');
  5     -- write the content of the buffer to a file
  6     write_log;
  7  END;
  8  /

PL/SQL procedure successfully completed

SQL> host cat /tmp/foo.log

this is a test

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