Question

我正在使用具有在线SQL Server数据库的android登录应用程序，必须从任何平台访问它。我打开了1433端口，并使用我的IP地址进行连接，而SQL Server中的所有配置仍然无法通过手机进行连接，而我可以轻松地从android studio中进行连接。

请帮助我，也许我缺少一些小东西。

MainActivity.java

public class MainActivity extends AppCompatActivity {



    ConnectionClass connectionClass;
    EditText edtuserid,edtpass;
    Button btnlogin;
    ProgressBar pbbar;


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

        connectionClass = new ConnectionClass();
        edtuserid = (EditText) findViewById(R.id.edtuserid);
        edtpass = (EditText) findViewById(R.id.edtpass);
        btnlogin = (Button) findViewById(R.id.btnlogin);
        pbbar = (ProgressBar) findViewById(R.id.pbbar);
        pbbar.setVisibility(View.GONE);

        btnlogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DoLogin doLogin = new DoLogin();
                doLogin.execute("");

            }
        });

    }

    public class DoLogin extends AsyncTask<String,String,String>
    {
        String z = "";
        Boolean isSuccess = false;


        String userid = edtuserid.getText().toString();
        String password = edtpass.getText().toString();


        @Override
        protected void onPreExecute() {
            pbbar.setVisibility(View.VISIBLE);
        }

        @Override
        protected void onPostExecute(String r) {
            pbbar.setVisibility(View.GONE);
            Toast.makeText(MainActivity.this,r,Toast.LENGTH_SHORT).show();

            if(isSuccess) {
                Intent i = new Intent(MainActivity.this, attendance.class);
                startActivity(i);
                finish();
            }

        }

        @Override
        protected String doInBackground(String... params) {
            if(userid.trim().equals("")|| password.trim().equals(""))
                z = "Please enter User Id and Password";
            else
            {
                try {
                    Connection con = connectionClass.CONN();
                    if (con == null) {
                        z = "Error in connection with The server";
                    } else {
                        String query = "select * from tablename where id='" + userid + "' and Password='" + password + "'";
                        Statement stmt = con.createStatement();
                        ResultSet rs = stmt.executeQuery(query);

                        if(rs.next())
                        {

                            z = "Login successfull ";
                            isSuccess=true;
                        }
                        else
                        {
                            z = "Invalid Credentials";
                            isSuccess = false;
                        }

                    }
                }
                catch (Exception ex)
                {
                    isSuccess = false;
                    z = "Exceptions";
                }
            }
            return z;
        }
    }
}

ConnectionClass.java

public class ConnectionClass {
    String ip = "192.168.....etc";
    String classs = "net.sourceforge.jtds.jdbc.Driver";
    String db = "dbname";
    String un = "sql server login username";
    String password = "*****";

    @SuppressLint("NewApi")
    public Connection CONN() {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
        StrictMode.setThreadPolicy(policy);
        Connection conn = null;
        String ConnURL = null;
        try {

            Class.forName(classs);
            ConnURL = "jdbc:jtds:sqlserver://" + ip + ";"
                    + "databaseName=" + db + ";user=" + un + ";password="
                    + password + ";";
            conn = DriverManager.getConnection(ConnURL);
        } catch (SQLException se) {
            Log.e("ERRO", se.getMessage());
        } catch (ClassNotFoundException e) {
            Log.e("ERRO", e.getMessage());
        } catch (Exception e) {
            Log.e("ERRO", e.getMessage());
        }
        return conn;
    }
}

清单

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

Answer 1

数据库可以是本地的，但是您必须配置网络，以便可以从外部访问它。

第一如果要在本地服务器上使用数据库，则必须确保从ISP获得固定的IP或使用其他方法来确保即使更改IP后IP始终可以访问（no-ip等可以做到这一点）。你）。

第二您必须将端口从路由器转发到您的DB Server，因此当它获得连接时，它将重定向到您的DB Server。

我的建议是将其包含在托管服务中

我无法从Android手机连接到MySQL服务器数据库，但可以从Android Studio仿真器连接到数据库

1 个答案: