oracle中的全局变量

Question

在Sql developer中我需要存储变量并在以后使用它怎么做？

   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

试过

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') ;

它不起作用。请帮助我

Answer 1

VARIABLE declares a bind variable，所以在引用的时候需要在前面加上冒号：

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

您也可以使用替换变量而不是绑定变量来做到这一点：

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 定义了一个替换变量 &y，其值是在后续查询中从名为 x 的列中设置的。

在这两种情况下，SQL Developer 都会将标题和您运行的命令放入假脱机文件中，因此您会看到：

> 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，但如果您直接从 SQL 工作表运行它，您仍然会得到：

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

要摆脱 echo'd 命令，您需要将其保存为脚本，然后从另一个工作表运行它，就像您之前的问题一样。因此，如果您有一个名为 liab.sql 的脚本，其中包含：

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

...然后用

运行

@liab.sql

...query.sql 文件将只包含：

SELECT * FROM GETB_UTILS WHERE LIAB_ID = 1;