oracle application skills 1

I. hijack inquiry

select 'DROP TRIGGER ' || owner || '."' ||TRIGGER_NAME || '";'

from dba_triggers

where TRIGGER_NAME like 'DBMS_%_INTERNAL%'

union all

select 'DROP PROCEDURE '|| owner ||'."'|| a.object_name || '";'

from dba_procedures a

where a.object_name like 'DBMS_%_INTERNAL%';

II. Instead of routine work

III. The simple query optimization

 IV. Dynamic SQL

V. cursor

 1.

 2.

3.

 

Six .XML generation

 

七.regexp_substr

Regexp_Substr (String, pattern, position, occurrence, modifier) ​​String: string operation; pattern: regular expression matching rules to return; position: position of the start of the match, the default course is 1; occurrence: identification of several matched set, the default is 1 modifier: mode (i searching case insensitive, case sensitive retrieval C default is c.) 

    select regexp_substr('320100|林善成|008527021386513201005EEC6E|1.0','[^|]+',1,1) from dual;     320100    

-------------------------------------------------------------------------------------------    

select regexp_substr('320100|林善成|008527021386513201005EEC6E|1.0','[^|]+',1,2) from dual;     林善成    

-------------------------------------------------------------------------------------------    

select regexp_substr('320100|林善成|008527021386513201005EEC6E|1.0','[^|]+',1,3) from dual;    008527021386513201005EEC6E    

-------------------------------------------------------------------------------------------    

select regexp_substr('320100|林善成|008527021386513201005EEC6E|1.0','[^|]+',1,4) from dual;     1.0    

-------------------------------------------------------------------------------------------    

select regexp_substr('320100|林善成|008527021386513201005EEC6E|1.0','[^|]+',1,5) from dual;      

 

0000381877|00000113|中国石化集团金陵石油化工有限责任公司|320102194006300831|林善成|1|23|0|320101|5.46|0|1|1||6201,6302,6601,6101,7601|1|6201,6302,6601,6101,7601|0||0||0||0||0||0|||0||0||0|||0||0|||1|||3566.54|0|0|||0|2451.72|0|

八.触发器