学步园

在处理EXCEPTION时应特别注意WHEN OTHERS THEN的使用，因为WHEN OTHERS THEN会吃掉所有的EXCEPTION。如果在WHEN OTHERS THEN后不抛出任何信息，即：WHEN OTHERS THEN NULL; 这可能会极大地增加以后程序排错的难度，因为即使出错了，也没有任何提示。所以我们需要特别留意WHEN OTHERS THEN，除了一个一个的手工查找外，还可以采用如下命令以便在编译时就进行检查：

ALTER SESSION SET plsql_warnings = 'enable:all';

 

测试样例：

Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.7.0<br /> Connected as xxpo</p> <p>SQL> set serveroutput on</p> <p>SQL> ALTER SESSION SET plsql_warnings = 'enable:all';</p> <p>Session altered</p> <p>SQL> @"D:/test/xxpotest.plb";</p> <p>Package body created</p> <p>SQL> sho err;<br /> Errors for PACKAGE BODY XXPO.XXPO_TEST_PKG:</p> <p>LINE/COL ERROR<br /> -------- --------------------------------------------------------------------------------------------------<br /> 88/13 PLW-05004: identifier LOG is also declared in STANDARD or is a SQL builtin<br /> 285/5 PLW-07203: parameter 'X_MESSAGE' may benefit from use of the NOCOPY compiler hint<br /> 504/5 PLW-07203: parameter 'X_MESSAGE' may benefit from use of the NOCOPY compiler hint<br /> 569/5 PLW-07203: parameter 'X_MESSAGE' may benefit from use of the NOCOPY compiler hint<br /> 1008/14 PLW-07204: conversion away from column type may result in sub-optimal query plan<br /> 1027/14 PLW-07204: conversion away from column type may result in sub-optimal query plan<br /> 2027/12 PLW-07204: conversion away from column type may result in sub-optimal query plan<br /> 1667/14 PLW-06009: procedure "SET_STG_TBL" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR<br /> 1716/14 PLW-06009: procedure "SET_STG_TBL" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR<br /> 1773/14 PLW-06009: procedure "SET_STG_TBL" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR<br /> 1755/14 PLW-06009: procedure "SET_STG_TBL" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR<br /> 1737/14 PLW-06009: procedure "SET_STG_TBL" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR<br /> 1789/10 PLW-06009: procedure "SET_STG_TBL" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR<br /> 2046/10 PLW-06009: procedure "MAIN" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR<br /> 1910/11 PLW-06002: Unreachable code</p> <p>SQL>