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public class BaseDao { // 01. 基础内容的准备 private static final String driver="com.microsoft.sqlserver.jdbc.SQLServerDriver"; private static final String url="jdbc:sqlserver://localhost:1433;DataBaseName=newsS2223"; private static final String username="sa"; private static final String pwd="6375196"; //02, 接口对象的准备 Connection con=null; PreparedStatement ps=null; public ResultSet rs=null; /** * 01.写一个用户获取到一个连接对象的方法，方法的返回值是Connection类型 * @return 连接对象 * @throws Exception */ public Connection getConnection() throws Exception{ Class.forName(driver); //什么条件下，构建connection对象 if (con==null||con.isClosed()) { con=DriverManager.getConnection(url, username, pwd); } //同志们碰到一个 return con; } /** * 执行查询操作 目的：返回一个读取器 * @param sql sql语句 * @param objs 参数列表 * @return 读取器对象 * @throws Exception */ public ResultSet executeQuery(String sql,Object... objs) throws Exception{ con=getConnection(); ps = con.prepareStatement(sql); for (int i = 0; i < objs.length; i++) { ps.setObject(i+1, objs[i]); } rs= ps.executeQuery(); return rs; } /** * 执行增删该操作 * @param sql sql语句 * @param objs 参数列表 * @return 受影响行数 * @throws Exception */ public int executeUpdate(String sql,Object... objs) throws Exception{ con=getConnection(); ps = con.prepareStatement(sql); for (int i = 0; i < objs.length; i++) { ps.setObject(i+1, objs[i]); } int count = ps.executeUpdate(); return count; } /** * 回收连接资源 * @throws Exception */ public void closeAll() throws Exception{ //倒着回收 if(rs!=null){ rs.close(); } if (ps!=null) { ps.close(); } if(con!=null){ con.close(); } } }
public class NewsDetailDAOImpl extends BaseDao implements NewsDetailDAO{ @Test public void testAll() throws Exception{ List<NewsDetail> list= getAllNews() ; for (NewsDetail item : list) { System.out.println(item.getNewsTitle()); } } public List<NewsDetail> getAllNews() throws Exception { List<NewsDetail> list=new ArrayList<NewsDetail>(); String sql="select * from newsDetails"; ResultSet rs = executeQuery(sql); if(rs!=null){ while(rs.next()){ //各个列 //赋值给单个新闻对象的各个属性 NewsDetail news=new NewsDetail(); news.setNewsId(rs.getInt("newsId")); news.setNewsTitle(rs.getString("newsTitle")); news.setNewsContent(rs.getString("newsContent")); news.setNewsCreateDate(rs.getDate("newsCreateDate")); news.setNewsAuthor(rs.getString("newsAuthor")); news.setNewsCategoryId(rs.getInt("newsCategoryId")); //单个新闻对象加入新闻泛型 list.add(news); } } return list; } }
public class NewsDetail {
private int newsId;
private String newsTitle;
private String newsContent;
private Date newsCreateDate;
private String newsAuthor;
private int newsCategoryId;
public int getNewsId() {
return newsId;
}
public void setNewsId(int newsId) {
this.newsId = newsId;
}
public String getNewsTitle() {
return newsTitle;
}
public void setNewsTitle(String newsTitle) {
this.newsTitle = newsTitle;
}
public String getNewsContent() {
return newsContent;
}
public void setNewsContent(String newsContent) {
this.newsContent = newsContent;
}
public Date getNewsCreateDate() {
return newsCreateDate;
}
public void setNewsCreateDate(Date newsCreateDate) {
this.newsCreateDate = newsCreateDate;
}
public String getNewsAuthor() {
return newsAuthor;
}
public void setNewsAuthor(String newsAuthor) {
this.newsAuthor = newsAuthor;
}
public int getNewsCategoryId() {
return newsCategoryId;
}
public void setNewsCategoryId(int newsCategoryId) {
this.newsCategoryId = newsCategoryId;
}
}
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原文地址：http://www.cnblogs.com/Smile-123/p/5633743.html
