public static void getConnAndTableStruct() {Connection connection = null;PreparedStatement pstmt = null;ResultSetMetaData rsmd = null;try {// mysql连接//Class.forName("org.gjt.mm.mysql.Driver");//connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");// oracle连接Class.forName("oracle.jdbc.driver.OracleDriver");String url="jdbc:oracle:thin:@192.168.12.12:1521:db";connection=DriverManager.getConnection(url,"manager","manager");pstmt = (PreparedStatement) connection.prepareStatement("select * from A_STAT");pstmt.execute(); // 这点特别要注意:如果是Oracle而对于mysql可以不用加.rsmd = (ResultSetMetaData) pstmt.getMetaData();//className = "User";//tableName = "user";for (int i = 1; i < rsmd.getColumnCount() + 1; i++) {//rsmd.getColumnName(i);//rsmd.getColumnClassName(i).substring(rsmd.getColumnClassName(i).lastIndexOf(".") + 1);System.out.println(rsmd.getColumnClassName(i));System.out.println(rsmd.getColumnName(i));System.out.println(rsmd.getColumnTypeName(i));System.out.println(rsmd.getPrecision(i));System.out.println(rsmd.getScale(i));System.out.println(rsmd.isNullable(i));//0 不能为空   1可以为空System.out.println("=============================");System.out.println("=============================");System.out.println("=============================");System.out.println("=============================");System.out.println("=============================");System.out.println("=============================");//    System.out.println(rsmd.getColumnDisplaySize(i));
//    System.out.println(rsmd.getColumnLabel(i));
//    System.out.println(rsmd.getPrecision(i));
//    System.out.println(rsmd.getColumnDisplaySize(i));
//    System.out.println(rsmd.getColumnDisplaySize(i));
//    System.out.println(rsmd.getColumnName(i) + "  " + rsmd.getColumnTypeName(i) + "  " + rsmd.getColumnClassName(i) + "  " + rsmd.getTableName(i));}} catch (ClassNotFoundException cnfex) {cnfex.printStackTrace();} catch (SQLException sqlex) {sqlex.printStackTrace();}}