java 調用 oracle存儲過程返回列表

 

--創建用戶表
create table users (
    uid varchar2(10) not null primary key,
    userName varchar2(20) not null,
    pwd varchar2(20) not null
);
--創建序列
create or replace sequence seq
start with 1 
increment by 1
maxvalue 20
minvalue 20
cycle
cache 20;
--創建一個有返回 procedure 首先需要創建一個包
create or replace package pk_userlist
as
type ref_users is ref cursor; --聲明動態遊標
end pk_userlist;
create or replace procedure sel_userlist(u_cursor out pk_userlist.ref_users)
is
begin
open u_cursor for select * from users;
end sel_userlist;

下面是 java調用代碼

//建立一個持久類
public class Users implement java.io.Serializable ...{
            private Integer uid;
            private String userName;
            private String pwd;

            public Users()...{
            }
            public Users(Integer uid)...{
                    this.uid = uid;
            }
            public Users(Integer uid,String userName,String pwd)...{
                   this.uid = uid;
                   this.userName = userName;
                   this.pwd = pwd;
            }
            public void setUid(Integer uid)...{
                    this.uid = uid;
            }
            public Integer getUid()...{
                    return uid;
            }
            public void setUserName(String userName)...{
                   this.userName = userName;
            }
            public String getUserName()...{
                   return userName;
            }
            public void setPwd(String pwd)...{
                  this.pwd = pwd;
            }
            public String getPwd()...{
                  return pwd;
            }
}//end class Users
//連接數據庫類
public class ConManager ...{
           private static String driver = "oracle.jdbc.driver.OracleDriver";
           private static String url = "jdbc:oracle:thin:@localhost:1521:orcl";
           private static String userName = "scott";
           private static String pwd = "tiger";
                //加載 oracle 驅動
               static ...{
                      try...{
                  Class.forName(driver);
     }catch(ClassNotFoundException ex)...{
               ex.printStackTrace();
     }catch(Exception ex)...{
               ex.printStackTrace();
     }
                }
                //獲取連接
                public static Connection getConnection() ...{
                       try...{
                return DriverManager.getConnection(url,userName,pwd);
        }catch(SQLException ex)...{
                ex.printStackTrace();
                return null;
                         }catch(Exception ex)...{
                ex.printStackTrace();
                return null;
                        }
              }//end getConnection()
}// end class ConManager

public class UserDaoImpl...{
            private Connection conn = null;
            private CallableStatement proc = null;
            private ResultSet rs = null;
            private Users users = null;

            //查詢方法，返回列表
            public List getUserAll()...{
            List result = new ArrayList();
            try...{
    conn = ConManager.getConnection();
    //如果得到的 connection 爲空,直接返回一個 null;
    if(conn == null)...{
             return null;
    }
    /**//*調用存儲過程*/
    proc = conn.prepareCall("{ call scott.sel_userlist(?)}");
    /**//*傳入一個輸出參數,因爲前面定義的存儲過程參數是包,包裏定義了一個遊標,所以這裏傳進來一個遊標用來輸出*/
    proc.registerOutParameter(1,oracle.jdbc.OracleTypes);
    /**//*執行存儲過程*/
    proc.execute();
    /**//*得到結果集,並轉換爲 ResultSet */
    rs = (ResultSet)proc.getObject(1);
    while(rs.next())...{
                            users = new Users();
                            users.setUid(rs.getInt("uid"));
           users.setUserName(rs.getString("userName"));
           users.setPwd(rs.getString("pwd"));
           result.add(users);
    }
    /**//*
                       *這裏判斷並不是必須,可在前臺處理,前臺我這就不寫了,這裏這樣寫只是爲了更好的理解,
                       *真正開發最好放在前臺處理
     *前臺寫法與這裏一樣,如果是結合struts or servlet 寫法如下:
     *List list = UserDaoImpl.getUserAll();
     *if(list == null){
     *   request.setAttribute("error","沒有你要查詢的數據!!!"); 
     *}
    */
    if(result.size() > 0 && result != null)...{
           return result;
    }
    else...{
           throw new Exception("沒有你要查詢的數據!!!");
    }
           }catch(SQLException ex)...{
    ex.printStackTrace();
           }catch(Exception ex)...{
      ex.printStackTrace();
           }finally...{
              try...{
    //釋放所有資源,關閉連接
    users = null;
    this.close(rs,proc,null,conn);
             }catch(SQLException ex)...{
    ex.printStackTrace();
             }
            }
             return null;
} //end getUserAll()
//關閉連接
public void close(ResultSet rs,CallableStatement proc,PreparedStatement ps,Connection conn)...{
            if(rs != null)...{
                  try...{
    rs.close();
                  }catch(SQLException ex)...{
    ex.printStackTrace();
                  }
            }
            if(proc != null)...{
                  try...{
    proc.close();
                  }catch(SQLException ex)...{
    ex.printStackTrace();
                  }
           }
           if(ps != null)...{
                  try...{
    ps.close();
                  }catch(SQLException ex)...{
    ex.printStackTrace();
                  }
           }
           if(conn != null)...{
                  try...{
    conn.close();
                   }catch(SQLException ex)...{
    ex.printStackTrace();
                   }
           }
   }//end close();
}//end class UserDaoImpl

上面的代碼實現了用 java 調用oracle存儲過程返回一個列表,還要請各位讀者多多指教