PL/SQL编程基础

CURSOR 游标

游标属性：
cur_tmp%found 至少影响到一行数据为true;
cur_tmp%notfound 与%found相反
cur_tmp%rowcount 返回受SQL语句影响的行数
cur_tmp%isopen 游标打开时为true

 

• 显示 cursor

--显示cursor
set serveroutput on
declare
cursor cur_emp(var_name in varchar2:='lili')
is select cust_no,cust_name,address from t_cscustomer where cust_name like var_name||'%';
type record_emp is record
(
var_empno t_cscustomer.cust_no%type,
var_empname t_cscustomer.cust_name%type,
var_empaddress t_cscustomer.address%type
);
emp_row record_emp;
begin
 DBMS_OUTPUT.ENABLE(buffer_size => null);    --表示输出buffer不受限制
 open cur_emp('刘');
 fetch cur_emp into emp_row;
 while cur_emp%found loop
  dbms_output.put_line(emp_row.var_empname||'的编号是'||emp_row.var_empno||',地址是'||emp_row.var_empaddress);
  fetch cur_emp into emp_row;
 end loop;
 close cur_emp;
end;
/

• for 中使用cursor 不用进行打开游标、读取游标、关闭游标 oracle内部自动完成

declare
cursor cur_emp 
is 
select cust_name var_ename,linkphone var_phone,address var_sal from t_cscustomer where address like '%招南%0402室%';
begin
 DBMS_OUTPUT.ENABLE(buffer_size => null);    --表示输出buffer不受限制
 for empinfo in cur_emp loop
  dbms_output.put_line('雇员'||empinfo.var_ename||'的电话是'||empinfo.var_phone||'、地址是'||empinfo.var_sal);
 end loop;
end;
/

 

• 自定义异常

--自定义异常
declare
  v_num number := 0;
  myexc exception; --定义一个异常变量
begin
 v_num := 1 + 1;
 raise myexc;

exception
  when myexc then
  dbms_output.put_line('自定义异常');
  retrun;
end;
/

• 存储过程、函数、触发器、包