sysdao.java

Java企业级开发项目实践,这是他的附光盘

//---------------------------------------------------------
// Application: Portal of Enterprice
// Author     : eSingle
// File       : SysDAO.java
//
// Copyright 2002 LandSoft Corp.
// Generated at Mon Nov 18 19:57:10 CST 2002
// Created by caoguangxin
// mailto:[e-mail]
//---------------------------------------------------------

package com.landsoft.portal.managent.dao;

import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;

import com.landsoft.portal.managent.model.*;
import com.landsoft.portal.managent.util.CacheManager;

public class SysDAO extends DAO {

  public SysDAO(DataSource ds) {
    super(ds);
  }
  //Sys增加方法
  public void insert(Sys sys) throws SQLException {
    String sql;
    sql = "INSERT INTO sys (systemname, author, version) VALUES (?, ?, ?)";
    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    try {
      conn = ds.getConnection();
      pstmt = conn.prepareStatement(sql);
      pstmt.setString(1, sys.getSystemname());
      pstmt.setString(2, sys.getAuthor());
      pstmt.setString(3, sys.getVersion());
      pstmt.executeUpdate();
      pstmt.close();
      conn.commit();
    } catch (SQLException sqle) {
      close(rs);
      close(pstmt);
      rollback(conn);
      sqle.printStackTrace();
      throw sqle;
    } finally {
    	close(conn);
    }
  }
  //Sys更新方法
  public void update(Sys sys) throws SQLException {
  	Connection conn = null;
  	PreparedStatement pstmt = null;
    try {
      conn = ds.getConnection();
      String sql = "UPDATE sys SET author=?, version=? WHERE systemname=?";
      pstmt = conn.prepareStatement(sql);
      pstmt.setString(1, sys.getAuthor());
      pstmt.setString(2, sys.getVersion());
      pstmt.setString(3, sys.getSystemname());
      pstmt.executeUpdate();
      close(pstmt);
      conn.commit();
    } catch (SQLException e) {
      close(pstmt);
      rollback(conn);
      e.printStackTrace();
    } finally {
    	close(conn);
    }
  }
  //Sys删除方法
  public void delete(String systemname) throws SQLException {
  	Connection conn = null;
  	PreparedStatement pstmt = null;
    try {
      conn = ds.getConnection();
      String sql = "DELETE FROM sys WHERE systemname=?";
      pstmt = conn.prepareStatement(sql);
      pstmt.setString(1, systemname);
      pstmt.executeUpdate();
      close(pstmt);
      conn.commit();
    } catch (SQLException e) {
      close(pstmt);
      rollback(conn);
      e.printStackTrace();
    } finally {
    	close(conn);
    }
    String[] objKeys = {"Sys", String.valueOf(systemname)};
    String objKey = CacheManager.createKey(objKeys);
    DAOCacheManager.invalidate(objKey);
  }
  //通过系统名称来查询
  public Sys retrieve(String systemname) throws SQLException {
    String[] objKeys = {"Sys", String.valueOf(systemname)};
    String objKey = CacheManager.createKey(objKeys);
    Sys sys = (Sys) DAOCacheManager.getCache(objKey);
    if (sys != null)
      return sys;
    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    try {
      conn = ds.getConnection();
      String sql="";
      if(systemname==null || systemname.equals(""))
      {
        sql = "SELECT * FROM sys";
        pstmt = conn.prepareStatement(sql);

      }
      else
      {
        sql = "SELECT * FROM sys WHERE systemname=?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, systemname);
      }
      rs = pstmt.executeQuery();
      if (rs.next()) {
        sys = new Sys();
        sys.setSystemname(rs.getString(1));
        sys.setAuthor(rs.getString(2));
        sys.setVersion(rs.getString(3));
        populate(sys, rs);
      }
      close(rs);
      close(pstmt);
    } catch (SQLException e) {
      close(rs);
      close(pstmt);
      rollback(conn);
      e.printStackTrace();
    } finally {
    	close(conn);
    }
    DAOCacheManager.putCache(sys, objKey, 1);
    return sys;
  }

  public List list() throws SQLException {
    String[] objKeys = {"Sys", "list"};
    String objKey = CacheManager.createKey(objKeys);
    ArrayList list = (ArrayList) DAOCacheManager.getCache(objKey);
    if (list != null)
      return list;
    list = new ArrayList();
    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    try {
      conn = ds.getConnection();
      String sql = "SELECT author, version, systemname FROM sys";
      pstmt = conn.prepareStatement(sql);
      rs = pstmt.executeQuery();
      while(rs.next()) {
        Sys sys = new Sys();
        sys.setAuthor(rs.getString(1));
        sys.setVersion(rs.getString(2));
        sys.setSystemname(rs.getString(3));
        populate(sys, rs);
        list.add(sys);
      }
      close(rs);
      close(pstmt);
    } catch (SQLException e) {
      close(rs);
      close(pstmt);
      rollback(conn);
      e.printStackTrace();
    } finally {
    	close(conn);
    }
    DAOCacheManager.putCache(list, objKey, 1);
    return list;
  }
  //返回系统表内所有的记录
  public List all() throws SQLException {
    ArrayList list  = new ArrayList();
    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    try {
      conn = ds.getConnection();
      String sql = "SELECT author, version, systemname FROM sys";
      pstmt = conn.prepareStatement(sql);
      rs = pstmt.executeQuery();
      while(rs.next()) {
        Sys sys = new Sys();
        sys.setAuthor(rs.getString(1));
        sys.setVersion(rs.getString(2));
        sys.setSystemname(rs.getString(3));
        populate(sys, rs);
        list.add(sys);
      }
      close(rs);
      close(pstmt);
    } catch (SQLException e) {
      close(rs);
      close(pstmt);
      rollback(conn);
      e.printStackTrace();
    } finally {
            close(conn);
    }

    return list;
  }
  //
  public List list(int offset, int limit) throws SQLException {
    String[] objKeys = {"Sys", "list", String.valueOf(offset), String.valueOf(limit)};
    String objKey = CacheManager.createKey(objKeys);
    ArrayList list = (ArrayList) DAOCacheManager.getCache(objKey);
    if (list != null)
      return list;
    list = new ArrayList();
    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    try {
      conn = ds.getConnection();
      String sql = "SELECT author, version, systemname FROM sys";
      pstmt = conn.prepareStatement(sql);
      rs = pstmt.executeQuery();
      if(offset > 0) rs.absolute(offset);
      int recCount = 0;
      while((recCount++ < limit) && rs.next()) {
        Sys sys = new Sys();
        sys.setAuthor(rs.getString(1));
        sys.setVersion(rs.getString(2));
        sys.setSystemname(rs.getString(3));
        populate(sys, rs);
        list.add(sys);
      }
      close(rs);
      close(pstmt);
    } catch (SQLException e) {
      close(rs);
      close(pstmt);
      rollback(conn);
      e.printStackTrace();
    } finally {
    	close(conn);
    }
    DAOCacheManager.putCache(list, objKey, 1);
    return list;
  }

}