整理 javaweb 連接數據庫方法

方法1 利用jtds 驅動
\*
common層 建立數據庫連接工具類 daoutil
連接sqlserver數據庫 先導入jtds包,

*\

連接方法1：

public class DAOUtil {
	
	private final static String DATA_URL = "jdbc:jtds:sqlserver://127.0.0.1:1433/數據庫名";//指定連接地址和端口
	private final static String DATA_PSW = "sa";                                          //登錄密碼
	private final static String DATA_UN = "sa";                                           //登錄用戶名
	public static Connection getconnection() throws ClassNotFoundException, SQLException{
		Class.forName("net.sourceforge.jtds.jdbc.Driver");
		Connection con = DriverManager.getConnection(DATA_URL, DATA_UN, DATA_PSW);
		con.setAutoCommit(false);
		return con;	
	}
}

連接方法2：（需要在webroot下 meta-inf下配置context.xml 文件,同時在lib目錄下需要jtds.jar,如果是連接MySQL數據庫
需要mysql-connector-java-5.1.18-bin.jar）

public static Connection getConnection() throws SQLException{
		Connection con = null;
		try {
			Context cntxt = new InitialContext();
			DataSource ds = (DataSource) cntxt.lookup("java:comp/env/jdbc/數據庫名");
			con = ds.getConnection();
			con.setAutoCommit(false);
			
		} catch (NamingException e) {
			e.printStackTrace();
		} 
		return con;
	}

WebRoot/META-INF/context.xml 配置

<?xml version="1.0" encoding="UTF-8"?>
<Context>
	<Resource  
		name="jdbc/woniuoa"   
    	auth="Container"  
    	type="javax.sql.DataSource"  
    	driverClassName ="net.sourceforge.jtds.jdbc.Driver"  
    	url="jdbc:jtds:sqlserver://127.0.0.1:1433/數據庫名" 
    	maxActive="1000"
    	maxIdle="20"
    	initialSize="50"   
    	timeBetweenEvictionRunsMillis="300000"  
     	minEvictableIdleTimeMillis="1800000" 
     	testWhileIdle="true"
    	maxWait="5000" 
    	username="sa"  
    	password="sa"  	
	/>  
</Context>

/*
dao層 建立 數據庫表dao ，在service層調用數據庫連接 傳con參數，dto參數調用具體dao類
*/

public class BaseuserDAO {
//查詢
	public Baseuser findByName(Connection con,LoginDto dto) throws SQLException{	
		String sql = "SELECT psw FROM baseuser WHERE uname=?";//這樣寫可以防止數據注入
		PreparedStatement ps =con.prepareStatement(sql);
		ps.setString(1, dto.getName());
		ResultSet rs = ps.executeQuery();	
		Baseuser bu = new Baseuser();
		if(rs.next()){
			bu.setPass(rs.getString("psw"));
		}
		return bu;	
	}
//增加數據
	public String addEmp(Connection con,HumanDTO hDto) throws SQLException {
		System.out.println("addempdao---"+hDto);
		String sql = "insert into "+
		"employee (emtime,emname,sex,age,number,campus_id,job_id,emstatus,tel,addr,sosname,sostel,ul_id)"+
		" values(?,?,?,?,?,?,?,?,?,?,?,?,?)";
		PreparedStatement ps = con.prepareStatement(sql);
		
		ps.setString(1, hDto.getEmTime());
		ps.setString(2, hDto.getEmName());
		...
		ps.setInt(13, hDto.getUlId());		
		ps.executeUpdate();
		return "ajax 添加成功";
		
	}


//修改數據
	public String upDateEmp(Connection con, HumanDTO hDto) throws SQLException {
		String sql = "update "+
		"employee=set emtime=?,emname=?,sex=?,age=?,"+
		"campus_id=?,job_id=?,emstatus=?,tel=?,addr=?,sosname=?,sostel=?"+
		" where number=?";
		PreparedStatement ps = con.prepareStatement(sql);
		
		ps.setString(1, hDto.getEmTime());
		...
		ps.setString(12, hDto.getNumber());
		System.out.println("number----"+hDto.getNumber());
		ps.executeUpdate();
		return "AJAX 修改成功";
	}
}

在業務action層調用service層的方法時，有更新修改刪除操作等產生事物要寫try{ 沒異常Commit}  catch

{ 有異常rowback}

 666導航網  可以自由收藏管理個人常用網址的便捷上網工具