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;
/