简要记录存储过程语法与Java程序的调用方式
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 )
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;
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 ;
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;
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;
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：
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 );
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
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;/