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03地铁查询系统

时间:2023-06-10 22:45:39浏览次数:32  
标签:03 layout 查询 content 地铁 import android data id

地铁查询系统

2023.6.10

1、优化返回两个站点之间最短路径功能:成为一个类,进行单元测试。

2、生成遍历车站类:要求尽可能快地遍历地铁的所有车站呢(只用经过一次,不用下车,就算经过车站)。

 

 

连接数据库:

package com.example.underground;

 

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

 

public class DBUtil {

 

    //连接数据库

    public Connection getConnection()  {

        try {

            Class.forName("com.mysql.jdbc.Driver");

        } catch (ClassNotFoundException e) {

            throw new RuntimeException(e);

        }

        Connection con = null;

        try {

            con = DriverManager.getConnection("jdbc:mysql://10.99.112.73:3306/dab2?useUnicode=true&characterEncoding=utf8", "zsf", "1234");

        } catch (SQLException e) {

            throw new RuntimeException(e);

        }

        return con;

    }

 

    //check1

    public String getCheck1(String text) throws SQLException {

 

        String data="此地铁线路途径站点如下:"+"\n";

        Connection connection = getConnection();

        PreparedStatement preparedStatement = null;

        String sql = "select distinct station_name from bj_subway where line_name like ?";

        preparedStatement=connection.prepareStatement(sql);

        preparedStatement.setString(1, "%"+text+"%");

        ResultSet rs=preparedStatement.executeQuery();

 

        while(rs.next()){

            data+=rs.getString("station_name");

            data+="\n";

 

        }

        return data;

    }

 

    //check2

    public String getCheck2(String text) throws SQLException {

 

        String data="途径该站点的线路如下:"+"\n";

        Connection connection = getConnection();

        PreparedStatement preparedStatement = null;

        String sql = "select distinct line_name from bj_subway where station_name = ?";

        preparedStatement=connection.prepareStatement(sql);

        preparedStatement.setString(1, text);

        ResultSet rs=preparedStatement.executeQuery();

 

        while(rs.next()){

            data+=rs.getString("line_name");

            data+="\n";

 

        }

        return data;

    }

 

    //check3

    public String getCheck3(String text1,String text2) throws SQLException {

 

        String data="";

        Connection connection = getConnection();

        PreparedStatement preparedStatement = null;

        String sql = "WITH RECURSIVE transfer (start_station, stop_station, stops, path) AS ( SELECT station_name, next_station, 1, CAST(CONCAT(line_name,station_name , '\n', line_name,next_station) AS CHAR(1000)) FROM bj_subway WHERE station_name = ? UNION ALL SELECT p.start_station, e.next_station, stops + 1, CONCAT(p.path, '\n', e.line_name, e.next_station) FROM transfer p JOIN bj_subway e ON p.stop_station = e.station_name AND (INSTR(p.path, e.next_station) = 0) ) SELECT * FROM transfer WHERE stop_station = ?";

        preparedStatement=connection.prepareStatement(sql);

        preparedStatement.setString(1, text1);

        preparedStatement.setString(2, text2);

        ResultSet rs=preparedStatement.executeQuery();

 

        while(rs.next()){

            int stops=rs.getInt("stops")+1;

            data=data+"共经过"+stops+"站:\n";

            data+=rs.getString("path");

            data+="\n";

            break;

 

        }

        return data;

    }

 

 

}

页面:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:background="@mipmap/dietie"

    tools:context=".MainActivity">

 

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="30dp"

        android:layout_marginTop="40dp"

        android:layout_marginRight="30dp"

        android:gravity="center"

        android:orientation="horizontal">

 

        <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="线路查询"

            android:textColor="@color/black"

            android:textSize="30sp" />

 

    </LinearLayout>

 

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="20dp"

        android:layout_marginTop="15dp"

        android:layout_marginRight="20dp"

        android:gravity="center_vertical"

        android:orientation="horizontal">

 

        <EditText

            android:id="@+id/et_check1"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_marginLeft="10dp"

            android:gravity="center_horizontal"

            android:hint="请输入要查询的线路"

            android:selectAllOnFocus="true"

            android:inputType="text"

            android:paddingLeft="10dp"

            android:textSize="18sp" />

 

    </LinearLayout>

 

 

    <Button

        android:id="@+id/btn_check1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="100dp"

        android:layout_marginTop="10dp"

        android:layout_marginRight="100dp"

        android:text="线路查询"

        android:textSize="30sp" />

 

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="30dp"

        android:layout_marginTop="10dp"

        android:layout_marginRight="30dp"

        android:gravity="center"

        android:orientation="horizontal">

 

        <ScrollView

            android:id="@+id/sv"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            >

        <TextView

            android:id="@+id/tv_check1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="null"

            android:textColor="@color/black"

            android:textSize="25sp" />

        </ScrollView>

 

    </LinearLayout>

 

 

</LinearLayout>

页面:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:background="@mipmap/dietie"

    tools:context=".MainActivity">

 

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="30dp"

        android:layout_marginTop="40dp"

        android:layout_marginRight="30dp"

        android:gravity="center"

        android:orientation="horizontal">

 

        <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="线路查询"

            android:textColor="@color/black"

            android:textSize="30sp" />

 

    </LinearLayout>

 

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="20dp"

        android:layout_marginTop="15dp"

        android:layout_marginRight="20dp"

        android:gravity="center_vertical"

        android:orientation="horizontal">

 

        <EditText

            android:id="@+id/et_check1"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_marginLeft="10dp"

            android:gravity="center_horizontal"

            android:hint="请输入要查询的线路"

            android:selectAllOnFocus="true"

            android:inputType="text"

            android:paddingLeft="10dp"

            android:textSize="18sp" />

 

    </LinearLayout>

 

 

    <Button

        android:id="@+id/btn_check1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="100dp"

        android:layout_marginTop="10dp"

        android:layout_marginRight="100dp"

        android:text="线路查询"

        android:textSize="30sp" />

 

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="30dp"

        android:layout_marginTop="10dp"

        android:layout_marginRight="30dp"

        android:gravity="center"

        android:orientation="horizontal">

 

        <ScrollView

            android:id="@+id/sv"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            >

        <TextView

            android:id="@+id/tv_check1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="null"

            android:textColor="@color/black"

            android:textSize="25sp" />

        </ScrollView>

 

    </LinearLayout>

 

 

</LinearLayout>

   

 

 

package com.example.underground;

 

import androidx.appcompat.app.AppCompatActivity;

 

import android.os.Bundle;

import android.os.StrictMode;

import android.text.TextUtils;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

 

import java.sql.SQLException;

 

public class Check2Activity extends AppCompatActivity implements View.OnClickListener {

 

    private DBUtil util;

    private EditText etCheck2;

    private Button btnCheck2;

    private TextView tvCheck2;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_check2);

        setTitle("站点查询");

 

        util = new DBUtil();

        //忘了干啥的了

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

        StrictMode.setThreadPolicy(policy);

 

        etCheck2 = findViewById(R.id.et_check2);

        tvCheck2 = findViewById(R.id.tv_check2);

        btnCheck2 = findViewById(R.id.btn_check2);

 

        btnCheck2.setOnClickListener(this);

    }

 

    @Override

    public void onClick(View view) {

        switch (view.getId()) {

            case R.id.btn_check2:

                String text = etCheck2.getText().toString().trim();

                String data= "";

                if(TextUtils.isEmpty(text)){

                    data="输入为空!";

                }

                else {

                    try {

                        data = util.getCheck2(text);

                    } catch (SQLException e) {

                        data = "站点不存在!";

                    }

                    if(data.equals("途径该站点的线路如下:\n")){

                        data="站点不存在!";

                    }

                }

                tvCheck2.setText(data);

                break;

        }

    }

}

 

 

 

 

 

package com.example.underground;

 

import androidx.appcompat.app.AppCompatActivity;

 

import android.os.Bundle;

import android.os.StrictMode;

import android.text.TextUtils;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

 

import java.sql.SQLException;

 

public class Check3Activity extends AppCompatActivity implements View.OnClickListener {

 

    private DBUtil util;

    private EditText etCheck31;

    private EditText etCheck32;

    private Button btnCheck3;

    private TextView tvCheck3;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_check3);

        setTitle("起点—终点查询");

 

        util = new DBUtil();

        //忘了干啥的了

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

        StrictMode.setThreadPolicy(policy);

 

        etCheck31 = findViewById(R.id.et_check31);

        etCheck32 = findViewById(R.id.et_check32);

        tvCheck3 = findViewById(R.id.tv_check3);

        btnCheck3 = findViewById(R.id.btn_check3);

 

        btnCheck3.setOnClickListener(this);

    }

 

    @Override

    public void onClick(View view) {

        switch (view.getId()) {

            case R.id.btn_check3:

                String text1 = etCheck31.getText().toString().trim();

                String text2 = etCheck32.getText().toString().trim();

                String data= "";

                if(TextUtils.isEmpty(text1)||TextUtils.isEmpty(text2)){

                    data="输入为空!";

                }

                else {

                    try {

                        data = util.getCheck3(text1,text2);

                    } catch (SQLException e) {

                        data = "两站点间不能通行!";

                    }

                    if(data.equals("")){

                        data="两站点间不能通行!";

                    }

                }

                tvCheck3.setText(data);

                break;

        }

    }

}

 

标签:03,layout,查询,content,地铁,import,android,data,id
From: https://www.cnblogs.com/ZRGUGUGU818/p/17472116.html

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