Connecting to MySQL from Android with JDBC

Question

I used the following code to connect MySQL in localhost from Android  It only displays the actions given in catch section   I do not know whether it is a connection problem or not    package com test1   import java sql Connection  import java sql DriverManager  import java sql PreparedStatement  import java sql ResultSet   import android app Activity  import android os Bundle  import android widget TextView   public class Test1Activity extends Activity           Called when the activity is first created         String str  new       static ResultSet rs      static PreparedStatement st      static Connection con        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main           final   TextView tv  TextView findViewById R id user            try                       Class forName  com mysql jdbc Driver                  con DriverManager getConnection  jdbc mysql   10 0 2 2 8080 example   root                   st con prepareStatement  select   from country where id 1                rs st executeQuery                 while rs next                                str rs getString 2                                  tv setText str               setContentView tv                     catch Exception e                        tv setText str                       When this code executes it  displays  new  in the avd   java lang management ManagementFactory getThreadMXBean  referenced from method com mysql jdbc MysqlIO appendDeadlockStatusInformation Could not find class  javax naming StringRefAddr   referenced from method com mysql jdbc ConnectionPropertiesImpl ConnectionProperty storeTo Could not find method javax naming Reference get  referenced from method com mysql jdbc ConnectionPropertiesImpl ConnectionProperty initializeFrom   Can anyone suggest some solution  And thanks in advance

User · Answer

this code runs permanently      created by diko Turkey       public void mysql          try           Class forName  com mysql jdbc Driver          catch  ClassNotFoundException e            e printStackTrace                thrd1   new Thread new Runnable             public void run                 while   Thread interrupted                      try                       Thread sleep 100                     catch  InterruptedException e1                                       if  con    null                        try                           con   DriverManager getConnection  jdbc mysql   192 168 1 45 3306 deneme    ali    12345                           catch  SQLException e                            e printStackTrace                            con   null                                             if   thrd2    null   amp  amp    thrd2 isAlive                             thrd2 start                                                            if   thrd1    null   amp  amp    thrd1 isAlive     thrd1 start         thrd2   new Thread new Runnable             public void run                 while   Thread interrupted                       if  con    null                        try                             con   DriverManager getConnection  jdbc mysql   192 168 1 45 3306 deneme    ali    12345                            Statement st   con createStatement                            String ali     fff                            st execute  INSERT INTO deneme  name  VALUES     ali                                   ResultSet rs   st executeQuery  select   from deneme                              ResultSetMetaData rsmd   rs getMetaData                              String result   new String                                while  rs next                                    result    rsmd getColumnName 1           rs getInt 1      n                                 result    rsmd getColumnName 2           rs getString 2      n                                                        catch  SQLException e                            e printStackTrace                            con   null                                             try                           Thread sleep 10                         catch  InterruptedException e                            e printStackTrace                                            else                       try                           Thread sleep 300                         catch  InterruptedException e                            e printStackTrace

User · Answer

If u need to connect your application to a server you can do it through PHP MySQL and JSON http   www androidhive info 2012 05 how-to-connect-android-with-php-mysql   Mysql Connection code should be in AsynTask class  Dont run it in Main Thread

User · Answer

You can t access a MySQL DB from Android natively  EDIT  Actually you may be able to use JDBC  but it is not recommended  or may not work       see Android JDBC not working  ClassNotFoundException on driver  See  http   www helloandroid com tutorials connecting-mysql-database  http   www basic4ppc com forum basic4android-getting-started-tutorials 8339-connect-android-mysql-database-tutorial html     Android cannot connect directly to the database server  Therefore we   need to create a simple web service that will pass the requests to the   database and will return the response    http   codeoncloud blogspot com 2012 03 android-mysql-client html  For most  good  users this might be fine  But imagine you get a hacker that gets a hold of your program  I ve decompiled my own applications and its scary what I ve seen  What if they get your username   password to your database and wreak havoc  Bad

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An other approach is to use a Virtual JDBC Driver that uses a three-tier architecture  your JDBC code is sent through HTTP to a remote Servlet that filters the JDBC code  configuration  amp  security  before passing it to the MySql JDBC Driver  The result is sent you back through HTTP  There are some free software that use this technique  Just Google  Android JDBC Driver over HTTP

User · Answer

public void testDB             TextView tv    TextView  this findViewById R id tv data           try                Class forName  com mysql jdbc Driver                    perfect                 localhost                                Connection con   DriverManager  getConnection                  jdbc mysql   192 168 1 5 3306 databasename user root amp password 123                                                    online testing              Connection con   DriverManager                      getConnection  jdbc mysql   173 5 128 104 3306 vokyak heyou user viowryk hiweser amp password 123                 String result    Database connection success n               Statement st   con createStatement                 ResultSet rs   st executeQuery  select   from tablename                 ResultSetMetaData rsmd   rs getMetaData                 while  rs next                       result    rsmd getColumnName 1           rs getString 1      n                              tv setText result             catch  Exception e                e printStackTrace                tv setText e toString

User · Answer

try changing in the gradle file the targetSdkVersion to 8  targetSdkVersion 8

User · Answer

Do you want to keep your database on mobile  Use sqlite instead of mysql   If the idea is to keep database on server and access from mobile  Use a webservice to fetch  modify data

[android] Connecting to MySQL from Android with JDBC

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