create or replace procedure proc_test(v_item in varchar2)
 as
 v_sql varchar2(2000):=''; --执行的sql
 v_num number(9);         --员工人数
 v_dname varchar2(200); --部门名称
begin
  --execute immediate用法1：立即执行sql
 v_sql:='select * from emp';
 execute immediate v_sql;
 dbms_output.put_line('execute immediate用法1执行成功！');
  --execute immediate用法2：立刻执行sql语句，并赋值给某个变量
 v_sql:='select count(*) from emp';
 execute immediate v_sql into v_num;
dbms_output.put_line('execute immediate用法2执行成功！员工总数：'||v_num);
--execute immediate用法3:立刻执行sql语句，并赋值给某个变量
 v_sql:='select dname from dept where deptno = :1 ';
 execute immediate v_sql into v_dname using v_item ;
 dbms_output.put_line('execute immediate用法3执行成功！'||v_item||'部门名称为：'||v_dname);
--异常处理
exception
  when OTHERS then
    begin
    dbms_output.put_line('sqlcode:'||sqlcode);
    dbms_output.put_line('sqlerror:'||SUBSTR(sqlERRM,1,200));
    dbms_output.put_line('error in line:'||DBMS_UTILITY.format_error_backtrace);
    end;
end proc_test;

执行存储过程：

begin

proc_test('20');

end;

/

结果：

execute immediate用法1执行成功！
execute immediate用法2执行成功！员工总数：14
execute immediate用法3执行成功！20部门名称为：RESEARCH