存储过程，存储函数(Oracle)

--打印hello world
create or replace procedure sayhelloworld
as 
  --说明部分
begin 
  dbms_output.put_line(‘hello world‘);
end;
/

--连接数据库
C:\WINDOWS\system32>sqlplus scott/tiger@192.168.56.101:1521/orcl
SQL>--调用方式一
SQL> set serveroutput on
SQL> exec sayhelloworld;
hello world

PL/SQL 过程已成功完成。

SQL> --调用方式二：
SQL> begin
  2      sayhelloworld();
  3      sayhelloworld();
  4  end;
  5  /
hello world
hello world

PL/SQL 过程已成功完成。

--给指定员工薪水涨100，并且打印涨前和涨后的薪水
create or replace procedure raiseSalary(eno in number) --in为输入参数
as 
  --说明部分
  psal emp.sal%type;

begin
  --得到涨前的薪水
  select sal into psal from emp where empno=eno;

  update emp set sal=sal+100 where empno=eno;

  --要不要commit？
  --为保证在同一事务中，commit由谁调用谁提交
  dbms_output.put_line(‘涨前：‘||psal||‘  涨后：‘||(psal+100));
end;
/

/*
     * 存储过程
     * create or replace procedure queryEmpInfo(eno in number,
     *                                     pename out varchar2,
     *                                     psal out number,
     *                                     pjob out varchar2)
     */
    @Test
    public void testProcedure() {
       // {call <procedure-name>[(<arg1>,<arg2>, ...)]}
       String sql = "{call queryEmpInfo(?,?,?,?)}";
       CallableStatement call = null;
       Connection connection = JDBCUtils.getConnection();
       try {
           call = connection.prepareCall(sql);
          
           //对于in参数，赋值
           call.setInt(1, 7839);
          
           //对于out参数，声明
           call.registerOutParameter(2, OracleTypes.VARCHAR);
           call.registerOutParameter(3, OracleTypes.NUMBER);
           call.registerOutParameter(4, OracleTypes.VARCHAR);
          
           //执行
           call.execute();
          
           //取出结果
           String name = call.getString(2);
           double sal = call.getDouble(3);
           String job = call.getString(4);
           System.out.println(name + "\t" + sal + "\t" + job);
          
       } catch (SQLException e) {
           e.printStackTrace();
       }finally{
           JDBCUtils.release(connection, call, null);
       }
    }

/*
     * 存储函数
     * create or replace function queryEmpIncome(eno in number) 
       return number
     */
    @Test
    public void testFunction() {
       // {?= call <procedure-name>[(<arg1>,<arg2>, ...)]}
       String sql = "{?=call queryEmpIncome(?)}";
       Connection conn = null;
       CallableStatement call = null;
       try {
           conn = JDBCUtils.getConnection();
           call = conn.prepareCall(sql);
 
           //对于out参数，赋值
           call.registerOutParameter(1, OracleTypes.NUMBER);
          
           //对于in参数，赋值
           call.setInt(2, 7839);
          
           //执行
           call.execute();
          
           //取出数据
           double income = call.getDouble(1);
           System.out.println(income);
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           JDBCUtils.release(conn, call, null);
       }
    }

CREATE OR REPLACE 
PACKAGE MYPACKAGE AS 

  type empcursor is ref cursor;
  --创建存储过程，输出参数为自定义类型
  procedure queryEmpList(dno in number,empList out empcursor);

END MYPACKAGE;

CREATE OR REPLACE
PACKAGE BODY MYPACKAGE AS

  procedure queryEmpList(dno in number,empList out empcursor) AS
  BEGIN
    --实现
    open empList for select * from emp where deptno=dno;

  END queryEmpList;

END MYPACKAGE;

public void testCursor() {
       // {call <procedure-name>[(<arg1>,<arg2>, ...)]}
      
       String sql = "{call MYPACKAGE.queryEmpList(?,?)}";
       Connection conn = null;
       CallableStatement call = null;
       ResultSet rs = null;
       try {
           conn = JDBCUtils.getConnection();
           call = conn.prepareCall(sql);
 
           //对于in参数，赋值?
           call.setInt(1, 20);
 
           //对于out参数，赋值
           call.registerOutParameter(2, OracleTypes.CURSOR);
 
           //执行
           call.execute();
 
           // 取出结果
           rs = ((OracleCallableStatement)call).getCursor(2);
           while(rs.next()){
              String name = rs.getString("ename");
              double sal = rs.getDouble("sal");
              System.out.println(name+"\t"+sal);
           }
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           JDBCUtils.release(conn, call, rs);
       }
    }