Question

oracle中 EXECUTE IMMEDIATE的作用是什么，怎样用的呢？

Answer 1

执行动态的SQL语句或非运行时创建的PL/SQL块.动态创建和执行SQL语句

EXECUTE IMMEDIATE -- 用法例子

1. 在PL/SQL运行DDL语句

begin
execute immediate 'set role all';
end;

2. 给动态语句传值(USING 子句)

declare
l_depnam varchar2(20) := 'testing';
l_loc varchar2(10) := 'Dubai';
begin
execute immediate 'insert into dept values (:1, :2, :3)'
using 50, l_depnam, l_loc;
commit;
end;

3. 从动态语句检索值(INTO子句)

declare
l_cnt varchar2(20);
begin
execute immediate 'select count(1) from emp'
into l_cnt;
dbms_output.put_line(l_cnt);
end;