JAVA 数据库操作简析

JAVA 数据库操作步骤：

1：注册驱动程序

静态方式：OracleDriver od = new OracleDriver();

    DriverManager.registerDriver(od); 编译时创建

动态方式：Class forName("oracle:jdbc:driver:OracleDriver").newInstance(); 利用了反射机制，运行时确定对象，括号内为对象在Jar包中的完整路径；

 2：构建连接

Connection conn = DriverManager.getConnection(String url); 

例如：url = "jdbc:oracle:thin:@127.0.0.1:test";

3 :创建执行语句

PreparedStatement  ps =  conn.preparedStatement("select * from user");

ResultSet rs = ps.execQuary();

或

Statement st = conn.createStatement();

ResultSet rs = st.execQuary("select * from user");

或

PreparedStatement ps = conn.preparedStatement();

ResultSet rs = ps. execQuary(String sql);

注： 批处理SQL 语句

ps.addBatch(String sql);

ps.executeBatch();

4 获取数据

rs.next();

System.out.println(rs.getString(1), rs.getString(2));