我有一个使用绑定变量编写的应用程序,名为:1,2,3.. 我想练习存储在 sql_area 中的执行计划,并使用相同的文本在 sqlplus 中执行查询
举例:
select * from dual where dummy=:1;
如何在 sqlplus 中将“1”定义为绑定变量?
var 1 varchar2(1); doesn't work.
它无法将“1”识别为变量名。
是的,这很烦人,但是您可以将查询包装到匿名 PL/SQL 块(脚本)中,如下所示:
SQL> exec execute immediate 'select count(*) cnt from dual where :1=dummy' using 'x';
PL/SQL procedure successfully completed.
SQL> select sql_id from v$sqlarea a where sql_text like 'select count(*) cnt from dual%';
SQL_ID
-------------
8y7sav2n21055
1 row selected.
SQL> ed tests/run_sql.sql
SQL> !cat tests/run_sql.sql
declare
vsql clob;
begin
select sql_fulltext into vsql from v$sqlarea a where a.sql_id='&1';
execute immediate vsql using &2;
end;
/
SQL> @tests/run_sql.sql 8y7sav2n21055 123
PL/SQL procedure successfully completed.
顺便说一句,SqlCl还有另一个更简单的解决方法:使用
alias
:
SQL> alias sel1=select :1 from dual;
SQL> sel1 123
:1
----------------------------------------------------
123
你尝试过这样做吗
VARIABLE in VARCHAR2(10)
EXEC :in := 'X';
EXEC EXECUTE IMMEDIATE 'select * from dual where dummy=:1' USING :in;
如果您想获得结果,请使用此
VARIABLE in VARCHAR2(10)
VARIABLE out VARCHAR2(10)
EXEC :in := 'X';
EXEC EXECUTE IMMEDIATE 'select ''hello ''||dummy from dual where dummy=:1' INTO :out USING :in;
PRINT out