oracle中的全局變量

Question

在Sql開發者中，我需要存儲變量並在以後使用它如何做到這一點？

VARIABLE liab NUMBER; 
    exec select nvl(LIAB_ID,-1)into liab FROM GETM_LIAB_CUST WHERE CUSTOMER_NO = (select customer_id from apps_master where ACCOUNT_NUMBER='&C' AND BRANCH_CODE = '&B') ; 

SPOOL c:\query.SQL 
select 'SELECT * FROM GETB_UTILS WHERE LIAB_ID =liab ;' FROM DUAL; 
spool off 

試圖

column liabid new_value liab noprint 
select nvl(LIAB_ID,-1) liabid FROM GETM_LIAB_CUST WHERE CUSTOMER_NO = (select customer_id from apps_master where ACCOUNT_NUMBER='&C' AND BRANCH_CODE = '&B') ; 

它不工作。請幫我

Answer 1

VARIABLE declares a bind variable，所以你需要使用一個冒號前綴它時，你參考一下吧：

VARIABLE liab NUMBER; 
exec select nvl(LIAB_ID,-1) into :liab FROM ... 

SPOOL c:\query.SQL 
select 'SELECT * FROM GETB_UTILS WHERE LIAB_ID = ' || :liab || ';' FROM DUAL; 
spool off 

您也可以使用替代變量而不是綁定變量來執行此操作：

column liab new_value g_liab 
select nvl(LIAB_ID,-1) as liab FROM ... 

SPOOL c:\query.SQL 
select 'SELECT * FROM GETB_UTILS WHERE LIAB_ID = &g_liab;' FROM DUAL; 
spool off 

column x new_value y syntax該定義一個替換變量&y，其值是從列設置在後續查詢稱爲x。

在這兩種情況下，SQL Developer將放在兩個頭，你跑進後臺打印文件的命令，所以你會看到這一點：

> select 'SELECT * FROM GETB_UTILS WHERE LIAB_ID = ' || :liab || ';' from dual 
'SELECT*FROMGETB_UTILSWHERELIAB_ID='||:LIAB||';'         
---------------------------------------------------------------------------------- 
SELECT * FROM GETB_UTILS WHERE LIAB_ID = 1;           

> spool off 

您可以添加set heading off和set echo off，但如果你運行它直接從SQL工作表，你還是會結束：

> select 'SELECT * FROM GETB_UTILS WHERE LIAB_ID = ' || :liab || ';' from dual 
SELECT * FROM GETB_UTILS WHERE LIAB_ID = 1;           

爲了擺脫你需要它保存爲一個腳本，然後運行從另一個工作表中回顯命令，因爲是與您以前的問題。所以，如果你有一個名爲liab.sql腳本包含：

VARIABLE liab NUMBER; 
set feedback off 
exec select nvl(LIAB_ID,-1) into :liab FROM ... 

set echo off 
set heading off 
SPOOL c:\query.SQL 
select 'SELECT * FROM GETB_UTILS WHERE LIAB_ID = ' || :liab || ';' FROM DUAL; 
spool off 

...然後跑去與

@liab.sql 

...的query.sql文件將包含剛：

SELECT * FROM GETB_UTILS WHERE LIAB_ID = 1;