oracle存储过程

Oracle Database，又名Oracle RDBMS，或简称Oracle。是甲骨文公司的一款关系数据库管理系统。到目前仍在数据库市场上占有主要份额。见很多朋友在讨教oracle 存储过程，小编特搜集整理了一份，一起来学习下吧！

一 存储过程

　　　　首先，我们建立一个简单的表进行存储过程的测试

create table 
xuesheng(id integer, xing_ming varchar2(25), yu_wen number, shu_xue number);

insert into xuesheng values(1,'zhangsan',80,90)
insert into xuesheng values(2,'lisi',85,87)

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1）无返回值的存储过程

create or replace procedure xs_proc_no is
begin
  insert into xuesheng values (3, 'wangwu', 90, 90);
  commit;
end xs_proc_no;

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2）有单个数据值返回的存储过程

create or replace procedure xs_proc(temp_name in varchar2,
                                    temp_num  out number) is
  num_1 number;
  num_2 number;
begin
  select yu_wen, shu_xue
    into num_1, num_2
    from xuesheng
   where xing_ming = temp_name;
  --dbms_output.put_line(num_1 + num_2);
  temp_num := num_1 + num_2;
end;

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其中，以上两种与sql server基本类似，而对于返回数据集时，上述方法则不能满足我们的要求。在Oracle中，一般使用ref cursor来返回数据集。示例代码如下：

3）有返回值的存储过程(列表返回)

首先，建立我们自己的包。并定义包中的一个自定义ref cursor

create or replace package mypackage as
  type my_cursor is ref cursor;
end mypackage;

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在定义了ref cursor后，可以书写我们的程序代码

create or replace procedure xs_proc_list(shuxue   in number,
                                         p_cursor out mypackage.my_cursor) is
begin
  open p_cursor for
    select * from xuesheng where shu_xue > shuxue;
end xs_proc_list;

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 二、程序调用

在本节中，我们使用java语言调用存储过程。其中，关键是使用CallableStatement这个对象，代码如下：

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String oracleDriverName = "oracle.jdbc.driver.OracleDriver";            // 以下使用的Test就是Oracle里的表空间         String oracleUrlToConnect = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";         Connection myConnection = null;         try {             Class.forName(oracleDriverName);         } catch (ClassNotFoundException ex) {             ex.printStackTrace();         }         try {             myConnection = DriverManager.getConnection(oracleUrlToConnect,                     "xxxx", "xxxx");//此处为数据库用户名与密码            } catch (Exception ex) {             ex.printStackTrace();         }         try {                            CallableStatement proc=null;             proc=myConnection.prepareCall("{call xs_proc(?,?)}");             proc.setString(1, "zhangsan");             proc.registerOutParameter(2, Types.NUMERIC);             proc.execute();             String teststring=proc.getString(2);             System.out.println(teststring);            } catch (Exception ex) {             ex.printStackTrace();         }

对于列表返回值的存储过程，在上述代码中做简单修改。如下

CallableStatement proc=null;
            proc=myConnection.prepareCall("{call getdcsj(?,?,?,?,?)}");
            proc.setString(1, strDate);
            proc.setString(2, jzbh);
            proc.registerOutParameter(3, Types.NUMERIC);
            proc.registerOutParameter(4, OracleTypes.CURSOR);
            proc.registerOutParameter(5, OracleTypes.CURSOR);
            proc.execute();
            ResultSet rs=null;
            int total_number=proc.getInt(3);
            rs=(ResultSet)proc.getObject(4);

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上述存储过程修改完毕。另外，一个复杂的工程项目中的例子：查询一段数据中间隔不超过十分钟且连续超过100条的数据。即上述代码所调用的getdcsj存储过程

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create or replace procedure getDcsj(var_flag     in varchar2,                                     var_jzbh     in varchar2,                                     number_total out number,                                     var_cursor_a out mypackage.my_cursor,                                     var_cursor_b out mypackage.my_cursor) is   total number;   cursor cur is     select sj, flag       from d_dcsj      where jzbh = var_jzbh      order by sj desc        for update;   last_time date; begin   for cur1 in cur loop     if last_time is null or cur1.sj >= last_time - 10 / 60 / 24 then       update d_dcsj set flag = var_flag where current of cur;       last_time := cur1.sj;     else       select count(*) into total from d_dcsj where flag = var_flag;       dbms_output.put_line(total);       if total < 100 then         update d_dcsj set flag = null where flag = var_flag;         last_time := null;         update d_dcsj set flag = var_flag where current of cur;       else         open var_cursor_a for           select *             from d_dcsj            where flag = var_flag              and jzbh = var_jzbh              and zh = 'A'            order by sj desc;         number_total := total;         open var_cursor_b for           select *             from d_dcsj            where flag = var_flag              and jzbh = var_jzbh              and zh = 'B'            order by sj desc;         number_total := total;         exit;       end if;     end if;   end loop;   select count(*) into total from d_dcsj where flag = var_flag;   dbms_output.put_line(total);   if total < 100 then     open var_cursor_a for       select * from d_dcsj where zh = 'C';     open var_cursor_b for       select * from d_dcsj where zh = 'C';   else     open var_cursor_a for       select *         from d_dcsj        where flag = var_flag          and jzbh = var_jzbh          and zh = 'A'        order by sj desc;     number_total := total;     open var_cursor_b for       select *         from d_dcsj        where flag = var_flag          and jzbh = var_jzbh          and zh = 'B'        order by sj desc;     number_total := total;   end if;   commit; end; /