动态SQL表名称作为变量 [英] Dynamic SQL table name as variable

问题描述

我有这个正在运行的过程，调用过程可以传递2个参数，并执行选择查询.

I have this procedure which is working, 2 parameters can be passed when calling procedure and it executes the select query.

create or replace procedure dynamic_sql
(input1 varchar2, input2 varchar2)
as begin
execute immediate
'select :variable1, :variable2 from emp'
using input1,input2;
end;
/
exec dynamic_sql('ename','job');

以相同的方式，我尝试添加第三个变量，它将替换表Emp，但它不起作用，传入的表名是100％正确的.这是无效的代码(ORA-00903:无效的表名):

In the same way I try to add third variable which will replace the table Emp, but it doesn't work, passed in table name is 100% correct. This is the code that doesn't work (ORA-00903: invalid table name):

create or replace procedure dynamic_sql
(input1 varchar2, input2 varchar2,input_table varchar2)
as begin
execute immediate
'select :variable1, :variable2 from :variable3'
using input1,input2,input_table;
end;
/
exec dynamic_sql('ename','job','emp');

推荐答案

尝试如下操作:这是由于在执行之前先解析了表名.

Try something like this: Its due to the parsing of the table name before execution.

create or replace procedure dynamic_sql
(input1 varchar2, input2 varchar2,input_table varchar2)
as
str varchar2(1000) := NUll; 
begin
str := 'select '||input1||','|| input2 ||' from '||input_table;
execute immediate str;
end;
/
exec dynamic_sql('ename','job','emp');

Procedure created.
 PL/SQL procedure successfully completed.   

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