jdbc select

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class mainclass {

    private static Connection getConn() {
        // String driver = "com.mysql.jdbc.Driver";
        // String url = "jdbc:mysql://localhost:3306/samp_db";
        String driver = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@192.168.1.200:1521:tyhzyl";
        String username = "xnh";
        String password = "a123456";
        Connection conn = null;
        try {
            Class.forName(driver); // classLoader,加载对应驱动
            conn = (Connection) DriverManager.getConnection(url, username,
                    password);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }

    private static Integer getAll() {
        Connection conn = getConn();
        String sql = "select * from ZD_JB where f_jbid=?";
        PreparedStatement pstmt;
        try {
            pstmt = (PreparedStatement) conn.prepareStatement(sql);
            pstmt.setString(1, "Z35.001");
            ResultSet rs = pstmt.executeQuery();
            int col = rs.getMetaData().getColumnCount();
            System.out.println("============================");
            while (rs.next()) {
                for (int i = 1; i <= col; i++) {
                    System.out.print(rs.getString(i) + "\t");
                    if ((i == 2) && (rs.getString(i).length() < 8)) {
                        System.out.print("\t");
                    }
                }
                System.out.println("");
            }
            System.out.println("============================");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("hello jdbc.");

        getAll();
    }

}