Android本地代码直接访问远程数据库(Rxjava方式)

1.引入jar驱动文件，驱动文件:mysql-connector-java-5.0.8-bin.jar,可以自己到网上下载

2.把代码中数据库地址和登录用户名密码替换就可以直接访问

java文件:

package com.hd.jdbc;

import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import com.hd.studyandtest.R;

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

import rx.Observable;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Func1;
import rx.schedulers.Schedulers;

public class ActivityJDBC extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activity_jdbc);


    }
    Connection conn=null;
    Statement stmt=null;
    @Override
    public void onClick(View v) {
        Observable.just("com.mysql.jdbc.Driver").map(new Func1<String, ResultSet>() {
            @Override
            public ResultSet call(String classname) {
                //注册驱动
                try {
                    //注册驱动
                    //Class.forName("com.mysql.jdbc.Driver");
                    Class.forName(classname);
                    String url = "jdbc:mysql://60.205.213.50:3306/app";
                    //Connection conn = DriverManager.getConnection(url, "root", "4f5c1c94bc");
                    Connection conn = DriverManager.getConnection(url, "admin", "admin");
                    Statement stmt = conn.createStatement();
                    String sql = "select * from user";
                    ResultSet rs = stmt.executeQuery(sql);
                    return rs;
                } catch (ClassNotFoundException e) {
                    Log.v("123", "fail to connect!" + "  " + e.getMessage());
                } catch (SQLException e) {
                    e.printStackTrace();
                    Log.v("123", "fail to connect!" + "  " + e.getMessage());
                }
                return null;
            }
        }).subscribeOn(Schedulers.newThread()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Subscriber<ResultSet>() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {
                try{
                    if(stmt!=null){
                        stmt.close();
                    }
                    if(conn!=null){
                        conn.close();
                    }
                }catch (SQLException sqle){
                    sqle.printStackTrace();
                }
            }

            @Override
            public void onNext(ResultSet rs){
                try {
                    while (rs.next()) {
                        Log.v("123", "field1-->" + rs.getString("account")+ "  field2-->" + rs.getString("name")+ "  field3-->" + rs.getString("password"));
                        Log.v("123", "field1-->" + rs.getString(1) + "  field2-->" + rs.getString(2)+ "  field3-->" + rs.getString(3));
                    }
                } catch (SQLException e) {
                    e.printStackTrace();
                }finally {
                    try{
                        if(stmt!=null){
                            stmt.close();
                        }
                        if(conn!=null){
                            conn.close();
                        }
                        if(rs!=null){
                            rs.close();
                        }
                    }catch (SQLException e){
                        e.printStackTrace();
                    }
                }
                Log.v("123", "success to connect!");
            }
        });
    }
}

XML文件:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.hd.jdbc.ActivityJDBC">
    <Button
        android:id="@+id/myjdbcbtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="connect jdbc"
        android:onClick="onClick"
        android:textAllCaps="false"
        />
</RelativeLayout>