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oracle存储过程中的select与参数详细说明

Jun 07, 2016 pm 05:45 PM
oracle select parameter storage process

 

create or replace procedure pro_test

  is

  begin

  select * from t_test;

  end pro_test;

  这个正确吗?

  昨天因为这个,耽误了好久(在一个存储过程中用了select语句,但既没有用游标也没有用into).

  在存储过程(oracle)中如果用了select语句,要么使用"select into 变量"语句要么使用游标,oracle不支持单独的select语句(如表述有误请指出).

  select into 比较简单,但是如果返回的是一个结果集就无法满足要求了.

  游标分cursor型游标和sys_refcursor型游标两种

  cursor型游标--不能用于参数传递

  create or replace procedure pro_test() is

  cusor_1 cursor is select 字段名 from 表名 where 条件;

  (或者

  select class_name into cursor_2 from class where ...;

  cursor的另一种用法,需要写在begin和end之间)

  begin

  select class_name into cursor_2 from class where ...;

  可以使用

  for xxx in cursor

  loop

  ....

  end loop; --对cursor进行遍历

  end pro_test;

  sys_refcursor型游标

  create or replace procedure pro_test(rscursor out sys_refcursor) is

  cursor sys_refcursor;

  name varhcar(20);

  begin

  open cursor for

  select name from student where ...; --使用open来打开进行赋值

  --遍历

  loop

  fetch cursor into name --fetch into来打开遍历的每条数据

  exit when cursor%notfound; --未找到记录信息

  dbms_output.putline(xxxx);

  end loop;

  rscursor := cursor;

  end pro_test;


如何在存储过程中调用其他的存储过程(这些都是带参数的)

 

一个带参数的存储过程。
sql> create or replace procedure helloworld1 (
  2    p_user_name  varchar2
  3  ) as
  4  begin
  5     dbms_output.put_line('hello ' || p_user_name || '!');
  6  end helloworld1;
  7  /

procedure created.

sql> create or replace procedure callhelloworld1 (
  2    p_user  varchar2
  3  ) as
  4  begin
  5    -- 调用存储过程的 存储过程
  6    helloworld1(p_user);
  7  end callhelloworld1;
  8  /

procedure created.

执行
sql> set serveroutput on
sql> exec callhelloworld1( 'tom' );
hello tom!

pl/sql procedure successfully completed.

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