Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

PL/SQL ѧϰ±Ê¼Ç3

 SQL> var a number
SQL> begin
2 :a :=1000;
3 end;
4 /
PL/SQL procedure successfully completed.
SQL> edit
Wrote file afiedt.buf
1 begin
2 dbms_output.put_line(:a);
3* end;
SQL> /
ͨ¹ýÕâ¸ö´úÂë¿ÉÒÔ¿´³öͨ¹ýpl/sql³õʼ»¯¸³ÖµµÄBind variable¿ÉÒÔ±»ÆäËûPl/sql³ÌÐòµ÷ÓÃ
%type ÀàÐÍÓ¦Óõϰ Èç¹ûÇ°ÃæÓõÄÊÇdatabase columnµÄ»° ÄÇô²»¿ÉÒÔ¼Ónot null,Ç°ÃæÒýÓõÄÊÇÉùÃ÷µÄ±äÁ¿¿ÉÒÔÓ¦ÓÃnot null
A NOT NULLdatabase column constraint does not apply to variables that are declared using %TYPE.  
Therefore, if you declare a variable using the %TYPEattribute that uses a database column defined as NOT  
NULL, you can assign the NULLvalue to the variable.  
eg:
°ó¶¨±äÁ¿
A bind variable is a variable that you declare in a host environment.
 Bind variables can be used to pass run-time values, either number or character, into or out of one or more PL/SQL programs. The PL/SQL  
programs use bind variables as they would use any other variable. You can reference variables declared in the  
host or calling environment in PL/SQL statements, unless the statement is in a procedure, function, or  
package. This includes host language variables declared in precompiler programs, screen fields in Oracle   Developer Forms applications, and iSQL*Plus bind variables.
°ó¶¨±äÁ¿¿ÉÒÔÔÚÖ÷»ú»·¾³ÏÂÉùÃ÷ ¿ÉÒÔÔÚsqlplus ÕâÖÖÓ¦ÓóÌÐòÏÂÉùÃ÷ È»ºópl/sql³ÌÐòÀ´µ÷Óà µ÷ÓÃÐèÒªÔڸñäÁ¿Ç°¼Ócolon
¸³ÖµµÄʱºò¿ÉÒÔʹÓà exec :var_name := 10000; or begin :var_name := 1000 end; »òÕßÊÇÔÚPL/SQLÖи³Öµ
print(sqlplus command)¿ÉÒÔ´òÓ¡³öÕâ¸öÖµ
SQL> var result number
SQL> begin
2 select (sal*12) + nvl(comm,0)
3 into :result
4 from emp
5 where empno = 7369;
6 end;
7 /
PL/SQL procedure successfully completed.
SQL> print result
RESULT
------
9600
SQL> exec :result = 10000
BEGIN :result = 10000; END;
*
ERROR at line 1:
ORA-06550: line 1, column 15:
PLS


Ïà¹ØÎĵµ£º

SQL²Ù×÷È«¼¯


SQL²Ù×÷È«¼¯
ÏÂÁÐÓï¾ä²¿·ÖÊÇMssqlÓï¾ä£¬²»¿ÉÒÔÔÚaccessÖÐʹÓá£
SQL·ÖÀࣺ
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(CREATE£¬ALTER£¬DROP£¬DECLARE)
DML—Êý¾Ý²Ù×ÝÓïÑÔ(SELECT£¬DELETE£¬UPDATE£¬INSERT)
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)
Ê×ÏÈ,¼òÒª½éÉÜ»ù´¡Óï¾ä£º
1¡¢ËµÃ÷£º´´½¨Êý¾Ý¿â
CREA ......

SQL²Ù×÷È«¼¯

SQL²Ù×÷È«¼¯
ÏÂÁÐÓï¾ä²¿·ÖÊÇMssqlÓï¾ä£¬²»¿ÉÒÔÔÚaccessÖÐʹÓá£
SQL·ÖÀࣺ
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(CREATE£¬ALTER£¬DROP£¬DECLARE)
DML—Êý¾Ý²Ù×ÝÓïÑÔ(SELECT£¬DELETE£¬UPDATE£¬INSERT)
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)
Ê×ÏÈ,¼òÒª½éÉÜ»ù´¡Óï¾ä£º
1¡¢ËµÃ÷£º´´½¨Êý¾Ý¿â
CREATE ......

MySqlµ¼³ösql½Å±¾


mysqlµ¼³ösql½Å±¾ Êղؠ
   ×¢ÒâÊÂÏî:
*±ØÐëÔÚD:\LTSOFT\MYSQL4\bin> mysqldump -u root -p test > c:\a.sql
ÏȵýøÈëmysql°²×°Ä¿Â¼µÄbinÏ£¨¿ÉÒÔ¿´µ½ÀïÃæÓÐmysqldump.exe£©£¬Í¨³£mysqlĬÈϰ²×°ÔÚC:\Program    Files\MySQL\MySQL Server 5.0
* ²»ÄܽøÈëmysql ÃüÁîÀï.
MySQLµ¼³ ......

SQL 2005 ´æ´¢¹ý³Ì·ÖÒ³

create PROCEDURE [dbo].[P_PageTest]
    @SQL Nvarchar(max),  --SQLÓï¾ä²»°üÀ¨ÅÅÐò
    @CurPage int,    --µ±Ç°Ò³
    @PageRows int,    --Ò³Ãæ³ß´ç
 @Order Nvarchar(20),  --ÅÅÐò×Ö¶Î
 @OrderType Nvarchar( ......

PL/SQL ѧϰ±Ê¼Ç2

±äÁ¿ÉùÃ÷
Syntax:
identifier [CONSTANT] datatype [NOT NULL]   [:= | DEFAULT expr];
SQL> declare
2 a date;
3 b number(20) not null :=100;
4 c varchar2(10);
5 d constant number(20) default 1000;
6 begin
7 null;
8 end;
9 /
PL/SQL procedure successful ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ