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. 返回单条结果


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;


/