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Oracle PL/SQL/PL SQL/Default Value - История изменений
2026-05-24T13:38:50Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T09:59:00Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Assign default value==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
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SQL><br />
SQL><br />
SQL> declare<br />
2 days_in_week constant number := 7;<br />
3 weeks_in_month number default 4;<br />
4 begin<br />
5 weeks_in_month := 5;<br />
6 end;<br />
7 /<br />
PL/SQL procedure successfully completed.<br />
SQL><br />
</source><br />
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==avoid declaration exception for default value==<br />
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<!-- start source code --><br />
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<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL> begin<br />
2 declare<br />
3 myNumber number default "MY NUMBER";<br />
4 begin<br />
5 null;<br />
6 exception<br />
7 when OTHERS then<br />
8 dbms_output.put_line("Exception caught in inner block");<br />
9 end;<br />
10 exception<br />
11 when others then<br />
12 dbms_output.put_line("Exception caught in outer block");<br />
13 raise;<br />
14 end;<br />
15 /<br />
begin<br />
*<br />
ERROR at line 1:<br />
ORA-06502: PL/SQL: numeric or value error: character to number conversion error<br />
ORA-06512: at line 13<br />
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SQL><br />
</source><br />
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==using the DEFAULT keyword to assign a value to a variable:==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL> declare<br />
2 l_days_in_week constant number := 7;<br />
3 l_weeks_in_month number default 4;<br />
4 begin<br />
5 l_weeks_in_month := 5;<br />
6 end;<br />
7 /<br />
PL/SQL procedure successfully completed.<br />
SQL><br />
</source></div>
Admin