Oracle存储过程使用动态SQL 有两种写法：用 DBMS_SQL 或 execute immediate，建议使用后者。试验步骤如下：
1：DDL和DML
/*** DDL ***/
begin
EXECUTE IMMEDIATE 'drop table temp_1';
EXECUTE IMMEDIATE 'create table temp_1(name varchar2(8))';
end;
/*** DML ***/
declare
v_1 varchar2(8);
v_2 varchar2(10);
str varchar2(50);
begin
v_1:='macower’;
v_2:='深圳;
str := 'INSERT INTO test (name ,address) VALUES (:1, :2)';
EXECUTE IMMEDIATE str USING v_1, v_2;
commit;
end;
2. 返回单条结果(核心是rownum=1)
declare
str varchar2(500);
c_1 varchar2(10);
r_1 test%rowtype;
begin
c_1:='测试人员';
str:='select * from test where name=:c WHERE ROWNUM=1';
execute immediate str into r_1 using c_1;
DBMS_OUTPUT.PUT_LINE(R_1.NAME||R_1.ADDRESS);
end ;
3：返回结果集(游标)
CREATE OR REPLACE package pkg_test as
/* 定义ref cursor类型
不加return类型，为弱类型，允许动态sql查询，
否则为强类型，无法使用动态sql查询;
*/
type myrctype is ref cursor;
--函数申明
function get(intID number) return myrctype;
end pkg_test;
/
CREATE OR REPLACE package body pkg_test as
--函数体
function get(intID number) return myrctype is
rc myrctype; --定义ref cursor变量
sqlstr varchar2(500);
begin
if intID=0 then
--静态测试，直接用select语句直接返回结果
open rc for select id,name,sex,address,postcode,birthday from student;
else
--动态sql赋值，用:w_id来申明该变量从外部获得
sqlstr := 'select id,name,sex,address,postcode,birthday from student where id=:w_id';
--动态测试，用sqlstr字符串返回结果，用using关键词传递参数
open rc for sqlstr using intid;
end if;
return rc;
end get;
end pkg_test;
