3.26全部完成android和web端的地铁查询系统

Posted 2023-03-26 2351920019xin

web端的思想在前面已经写了，Android端的思想

跟web端差不多少，其中不一样的就是连接MySQL

数据库，其要求的jar包是5版本左右的，而且还涉及

到线程的问题，在连接MySQL的时候要另外启动一个

线程进行连接，主要思想上没啥改变，就是每次每种

查询要加一个button并且对应Onclick事件，在这个事件

里面启动一个新的线程。

我的队友是高一榀，我俩在此次开发中收获了很多。

以下是改变部分的代码：

package mysqll;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBOpenHelper 
    private final static String driver = "com.mysql.jdbc.Driver";
    private final static String url = "jdbc:mysql://10.99.121.251/kebiao?useUnicode=true&characterEncoding=UTF-8&useSSL=false";//
    private final static String username = "root";
    private final static String password = "123456";

    Connection conn=null;
    Statement st=null;
    ResultSet rs=null;

    static 
        try 
            Class.forName(driver);
         catch (ClassNotFoundException e) 
            System.out.println("加载驱动错误");
        
    


    //2. 获取连接
    public static Connection getConnect() throws Exception 
        return DriverManager.getConnection(url, username, password);
    

    //3. 释放连接资源

    public static void release(Connection conn, Statement st, ResultSet rs) throws Exception 
        if (rs != null) 
            rs.close();
        
        if (st != null) 
            st.close();
        
        if (conn != null) 
            conn.close();
        

    
/*private static String diver = "com.mysql.jdbc.Driver";
    //加入utf-8是为了后面往表中输入中文，表中不会出现乱码的情况
    private static String url = "jdbc:mysql://10.99.117.52/xinwe?characterEncoding=utf-8";
    private static String user = "root";//用户名
    private static String password = "hzl02096";//密码
    *//*
     * 连接数据库
     * *//*
    public static Connection getConn()
        Connection conn = null;
        try 
            Class.forName(diver);
            conn = (Connection) DriverManager.getConnection(url,user,password);//获取连接
         catch (ClassNotFoundException e) 
            e.printStackTrace();
         catch (SQLException e) 
            e.printStackTrace();
        
        return conn;
    */

public int findstationsatrole(String roles) throws Exception 
    Connection conn = null;
    Statement state = null;
    ResultSet find = null;
    int stationsnumber = 0;
    try 
        conn = DBOpenHelper.getConnect();
        state = conn.createStatement();
        roles = roles + "号线";
        String sql = "SELECT  sname FROM biejing_subway"
                + " WHERE sline=\'" + roles + "\';";
        find = state.executeQuery(sql);

        stationsnumber = -1;

        while (find.next()) 
            stationsnumber++;
            onrolestation[stationsnumber] = new String();
            onrolestation[stationsnumber] = find.getString(1);
        
        if (stationsnumber != -1) 
            for (int i = 0; i <= (stationsnumber / 2) + 1; i++) 
                stationss = stationss + onrolestation[i]+" , ";
            
        

     catch (Exception e) 
        e.printStackTrace();
     finally 
        DBOpenHelper.release(conn, state, find);
    

    return stationsnumber;




public int findrolesatstation(String stations) throws Exception 
    Connection conn = null;
    Statement state = null;
    ResultSet find = null;
    int stationsnumber = 0;
    int rolesnumber = 0;
    try 
        conn = DBOpenHelper.getConnect();
        state = conn.createStatement();
        String sql = "SELECT  sline FROM biejing_subway"
                + " WHERE sname=\'" + stations + "\';";
        find = state.executeQuery(sql);

        rolesnumber = -1;
        int zhuanhuan = 0;
        while (find.next()) 
            if (zhuanhuan % 2 == 0) 
                rolesnumber++;
                onstationatroles[rolesnumber] = new String();
                onstationatroles[rolesnumber] = find.getString(1);

            
            System.out.print(rolesnumber);
            zhuanhuan++;
        

        if(rolesnumber!=-1) 
            for (int i = 0; i <= rolesnumber; i++) 
                rolessss = rolessss + onstationatroles[i] + " , ";
            
        

     catch (Exception e) 
        e.printStackTrace();
     finally 
        DBOpenHelper.release(conn, state, find);
    

    return rolesnumber;