“E-家园”个人网站系统 part01

package y2javaee.xmal2.operation; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.List; import java.util.Map; import javax.servlet.jsp.jstl.sql.Result; import y2javaee.xmal2.common.DBConnection; import y2javaee.xmal2.common.SQLCommandBean; import y2javaee.xmal2.entity.Article; public class ArticleBo { private Connection conn;//用于保存数据库连接对象 private PreparedStatement ps;//用于执行SQL语句 private ResultSet rs;//用来保存查询结果集 private final int TOP = 3;//在首页内显示的数量 /** * 根据文章类型查找文章对象 * @param type * @return 文章对象列表 */ public List selectArticleByType(int type) { List list = new ArrayList(); String sql = "select top " + TOP + " * from article where type=? order by writeDate"; try { conn = DBConnection.getConnectionForJndi();//使用JNDI方法获取数据库连接对象 ps = conn.prepareStatement(sql); ps.setInt(1, type); rs = ps.executeQuery(); while (rs.next()) { //封装数据 Article article = new Article(); article.setArticleId(rs.getInt("articleId")); article.setTitle(rs.getString("title")); article.setType(type); article.setContent(rs.getString("content")); article.setWriteDate(rs.getString("writeDate")); list.add(article);//把文章对象保存到List列表中 } } catch (Exception e) { e.printStackTrace(); } finally { DBConnection.closeResultSet(rs); DBConnection.closeStatement(ps); DBConnection.closeConnection(); } return list; } /** * 根据文章类型和用户名称查询文章对象 * @param type * @param userName * @return 文章对象列表 */ public List selectArticleByType(int type, String userName) { List list = new ArrayList(); String sql = "select top " + TOP + " * from article where type=? and writer = ? order by writeDate"; try { conn = DBConnection.getConnectionForJndi(); ps = conn.prepareStatement(sql); ps.setInt(1, type); ps.setString(2, userName); rs = ps.executeQuery(); while (rs.next()) { Article article = new Article(); article.setArticleId(rs.getInt("articleId")); article.setTitle(rs.getString("title")); article.setType(type); article.setContent(rs.getString("content")); article.setWriteDate(rs.getString("writeDate")); list.add(article); } } catch (Exception e) { e.printStackTrace(); } finally { DBConnection.closeResultSet(rs); DBConnection.closeStatement(ps); DBConnection.closeConnection(); } return list; } /** * 根据文章的类型、标题和作者信息，进行模糊查询文章对象 * @param type * @param title * @param writer * @return 文章对象列表 */ public List searchArtcle(String type, String title, String writer) { List list = new ArrayList(); //根据传入的参数的不同，进行拼写SQL语句 StringBuffer sql = new StringBuffer( "select top 10 * from article where 1=1 "); if (type != null && !"".equals(type) && type != "0") sql.append(" and type=" + type); if (title != null && !"".equals(title)) sql.append(" and title like '%" + title + "%'"); if (writer != null && !"".equals(writer)) sql.append(" and writer like '%" + writer + "%'"); sql.append(" order by writeDate desc"); try { conn = DBConnection.getConnectionForJndi(); ps = conn.prepareStatement(sql.toString()); rs = ps.executeQuery(); while (rs.next()) { Article article = new Article(); article.setArticleId(rs.getInt("articleId")); article.setTitle(rs.getString("title")); article.setType(rs.getInt("type")); article.setContent(rs.getString("content")); article.setContent(rs.getString("writer")); article.setWriteDate(rs.getString("writeDate")); list.add(article); } } catch (Exception e) { e.printStackTrace(); } finally { DBConnection.closeResultSet(rs); DBConnection.closeStatement(ps); DBConnection.closeConnection(); } return list; } // public Article getArticleById(String articleId) { // Article article = null; // String sql = "select * from article where articleId = ? "; // try { // conn = DBConnection.getConnectionForJndi(); // ps = conn.prepareStatement(sql); // // ps.setString(1, articleId); // rs = ps.executeQuery(); // while (rs.next()) { // article = new Article(); // article.setArticleId(rs.getInt("articleId")); // article.setTitle(rs.getString("title")); // article.setType(rs.getInt("type")); // article.setContent(rs.getString("content")); // article.setWriter(rs.getString("writer")); // article.setWriteDate(rs.getString("writeDate")); // } // } catch (Exception e) { // e.printStackTrace(); // } finally { // DBConnection.closeResultSet(rs); // DBConnection.closeStatement(ps); // DBConnection.closeConnection(); // } // return article; // } /** * 使用通用DAO类的形式进行数据库操作，根据文章ID，查询文章信息 * @param articleId 文章ID * @return Article 文章信息 */ public Article getArticleById(String articleId) { Article article = null; String sql = "select * from article where articleId = ? "; try { SQLCommandBean bean = new SQLCommandBean(); conn = DBConnection.getConnectionForJndi(); bean.setConnection(conn); bean.setSql(sql); List param = new ArrayList(); param.add(articleId); bean.setParamList(param); Result result = bean.executeQuery(); if (result == null || result.getRowCount() == 0) { return null; } else { Map row = result.getRows()[0]; article = new Article(); article.setArticleId(((Integer) row.get("articleId")) .intValue()); article.setTitle((String) row.get("title")); article.setType(((Integer) row.get("type")).intValue()); article.setContent((String) row.get("content")); article.setWriter((String) row.get("writer")); article.setWriteDate((String) row.get("writeDate")); } } catch (Exception e) { e.printStackTrace(); } return article; } }