oracle 存储过程和函数学习笔记

创建过程的语法：     

Code
<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->create [or replace] procedure procedure_name
  [(argument[{in|out|in out}] type,
    
   argument[{in|out|in out}] type)] {is|as}
  procedure_body
  
  

简单的例子：

Code
<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->
  create procedure RaiseError(
   /*if p_Raise is true,then an unhandled error is raised.
   if p_Raise is false,the procedure completes successfully.*/
      p_Raise in boolean:=true,
      p_ParameterA  out number) as
      
  begin 
      p_Parameter1:='abcdwxc';
      p_Parameter2:=143;
  end ParameterLength;

 

删除过程语法：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->drop procedure procedure_name;

 

2、创建函数的语法：

Code
<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->create [or replace] function function_name 
   [(argument[{in|out|in out}] type,
     
     argument[{in|out|in out}] type)] 
  return return_type {is|as}
  function_body

 

简单函数的例子：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--> create function ClassInfo(
      p_Department classes.department%type,
      p_Course     classes.course%type)
      return varchar is 
      v_CurrentStudents number;
      v_MaxStudents     number;
      v_PercentFull     number;
      begin
          select current_students,max_students 
          into v_CurrentStudents,v_MaxStudents
          from classes
          where department=P_Department and course=P_Course;
          
          --计算百分比
          v_PercentFull:=v_CurrentStudents/V_MaxStudent*100;
          
          if v_PercentFull=100 then
          return 'Full';
          elseif v_PercentFull>80 then 
          return 'Some Room';
          elseif v_PercentFull>60 then 
          return 'More Room';
          elseif v_PercentFull>0 then 
          return 'Lots of Room';
          else
          return 'Empty';
          end if 
          
      end ClassInfo;
          

 

删除函数语法：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->drop function function_name;