ORACLE 动态执行SQL语句

本文转自 http://zhaisx.iteye.com/blog/856472

Oracle 动态SQL
Oracle 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:='测试人员';
     v_2:='北京';
     str := 'INSERT INTO test (name ,address) VALUES (:1, :2)';
     EXECUTE IMMEDIATE str USING v_1, v_2;
     commit;
 end;

2.返回单条

 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

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;
/