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
try changing in the gradle file the targetSdkVersion to 8
targetSdkVersion 8
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.
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&password=123"
* );
*/
// online testing
Connection con = DriverManager
.getConnection("jdbc:mysql://173.5.128.104:3306/vokyak_heyou?user=viowryk_hiweser&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());
}
}
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) && (!thrd2.isAlive()))
thrd2.start();
}
}
}
});
if ((thrd1 != null) && (!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();
}
}
}
}
});
}
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.
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 & 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".
Source: Stackoverflow.com