oracle之动态sql、游标

动态sql

declare

--需要执行的动态sql语句：mysql

mysql varchar2(500);

emp_id number:=7566;

salary number(7,2);

dept_id number(2):=2;

dept_name varchar2(14);='PERSONNEL';

location varchar2(13):='DALLS';

emp_rec emp%rowtype;

begin

execute immediate 'create table bonus1(id number,amt number)'

mysql:='insert into dept values(:1,:2,:3)';

--将声明变量通过using传入动态sql

execute immediate mysql using dept_id,dept_name,mylocation;

--有查询结果的动态sql

mysql='select * from emp where empno=:id';

--将查询结果存入emp_rec中，将emp_id作为参数传给上面的sql语句中id

execute immediate mysql into emp_rec using emp_id;

dbms_output.put_line(emp_rec.ename);

end;

---更新数据的动态sql

mysql:='update emp set sal=200 where empno=:1 returning sal into:2';

--returning sal into :2将更新的sal的值返回给下面执行时的参数 returning into salary 中 salary接收

execute immediate mysql using emp_id returning into salary;

dbms_output.put_line(salary);

end;

---删除数据的动态sql

mysql:='delete from dept where deptno=:num';

execute immediate mysql using dept_id;

end;

---分页动态sql

--表名动态，每页数据条数动态，总页数，总数据条数

--变量：表名、每页长度、页码

declare

tablename varchar2(500):='emp';

pagesize number:=3;

pagenum number:=1;

mysql varchar2(2000);

begin

mysql:='select * from (select rownum n,e.* from '||tablename||' e)where n between '||((pagenum-1)*pagesize+1) ||'and '||pagenum*pagesize;

execute immediate mysql;

end;

游标

create or replace procedure selAll_emp_proc as

cursor sel_emp is select * from emp;--定义游标,该游标指向select * from emp 查询结果

rowresult emp%rowtype;

begin

open sel_emp;--打开游标

loop fetch sel_emp into rowresult;--将游标中的值赋给rowresult

exit when sel_emp%notfound;--当游标不存在时，跳出循环

dbms_output.put_line('员工名：'||rowresult.ename||'工资：'||rowresult.sal);

end loop;

close sel_emp;--关闭游标

end;