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Oracle9iÒì³£´¦Àí·ÖΪϵͳԤ¶¨ÒåÒì³£´¦ÀíºÍ×Ô¶¨ÒåÒì³£´¦ÀíÁ½²¿·Ö¡£
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1.¶¨ÒåÒì³£´¦Àí
declare Òì³£Ãû exception;
2.´¥·¢Òì³£´¦Àí
raise Òì³£Ãû
3.´¦ÀíÒì³£
exception
when Òì³£Ãû1 then
Òì³£´¦ÀíÓï¾ä¶Î1;
when Òì³£Ãû2 then
Òì³£´¦ÀíÓï¾ä¶Î2;
ʾÀý£º
set serveroutput on
declare
salaryerror exception;
tempsal scott.emp.sal%type;
begin
select sal into tempsal
from scott.emp
where empno=7566;
if tempsal<900 or tempsal>2600 then
raise salaryerror;
end if;
exception
when salaryerror then
dbms_output.put_line('нˮ³¬³ö·¶Î§');
end;
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C#ÖвÙ×÷OracleʱµÄSQLÓï¾ä²ÎÊýµÄÓ÷¨
OracleTransaction myTrans ;
conn.Open();
myTrans =conn.BeginTransaction(IsolationLevel.ReadCommitted) ......
select Convert( varchar(20) , ʱ¼ä×ֶΠ, ¸ñʽ ) from ±í È磺select Convert(varchar(20),LOGIN_DATE,112) from dbo.C_PARTY_CLIENT 100£ºJun 22 2009 12:00AM 101£º06/22/2009 102£º2009.06.22 103£º22/06/2009 104£º22.06.2009 105£º22-06-2009 106£º22
select Convert(varchar(20),<ʱ¼ä×Ö¶Î>,<¸ñʽ>) f ......
1¡¢ISNULL ( check_expression , replacement_value )
²ÎÊý
check_expression
½«±»¼ì²éÊÇ·ñΪ NULLµÄ±í´ïʽ¡£check_expression ¿ÉÒÔÊÇÈκÎÀàÐ͵ġ£
replacement_valueÔÚ check_expressionΪNULLʱ½«·µ»ØµÄ±í´ïʽ¡£replacement_value ±ØÐëÓë check_expresssion ¾ßÓÐÏàͬµÄÀàÐÍ¡£
·µ»ØÀàÐÍ
·µ»ØÓë check_expression Ï ......
°ÑOldÊý¾Ý¿â¸ÄΪNewÊý¾Ý¿â
1.´ò¿ª“ÆóÒµ¹ÜÀíÆ÷”ÕÒµ½ OldÊý¾Ý¿â££¡·ÓÒ¼ü££¡·ËùÓÐÈÎÎñ££¡··ÖÀëÊý¾Ý¿â
2.µ½C:\Program Files\Microsoft SQL Server\MSSQL\DataÏÂÕÒµ½Old_Data.mdfºÍOld_log.ldf°ÑOld_Data»»³ÉÄãÏëÒªµÄÃû×ÖÀýÈçNew.mdf¡¢New.ldf
3.µ½ÆóÒµ¹ÜÀíÆ÷£¬ÕÒµ½ Êý¾Ý¿â ££¡·ÓÒ¼ü££¡·ËùÓÐÈÎÎñ££¡ ......
1.³£Á¿
¶¨ÒåÓï·¨¸ñʽ£º
³£Á¿Ãû constant ÀàÐͱêʶ·û [not null]:=Öµ;
È磺PI constant number(9):=3.1415;
2.»ù±¾Êý¾ÝÀàÐͱäÁ¿
»ù±¾Êý¾ÝÀàÐÍ
number Êý×ÖÐÍ
int ÕûÊýÐÍ
pls_integer ÕûÊýÐÍ£¬²úÉúÒç³öʱ³öÏÖ´íÎó
binary_integer ÕûÊýÐÍ£¬±íʾ´ø·ûºÅµÄÕûÊý
char ¶¨³¤×Ö·ûÐÍ£¬×î´ó255¸ö×Ö·û
varchar2 ±ä³¤× ......