Hello i am currently building a programm that register users to mysql database. Everything works fine on localhost but when i try to connect to external database it gives me an error such as this below.
I have granted all privileges to the user in the database i am trying to acess and also i have the driver installed. Any ideas??
My code:
private void createEventListenerDBProperties() {
dbSubmitBtn.addActionListener((ActionEvent e) -> {
if (dbDriverChooser.getSelectedItem().equals("com.mysql.jdbc.Driver")) {
driver = (String) dbDriverChooser.getSelectedItem();
port = dbPortField.getText();
host = "jdbc:mysql://" + hostField.getText() + ":" + port + "/";
db = dbnameField.getText();
dbuser = dbUsernameField.getText();
dbpassword = new String(dbPasswordField.getPassword());
}
}
});
}
private Connection instanciateDB() {
Connection con = null;
try {
Class.forName(driver);
con = DriverManager.getConnection(host + db, dbuser, dbpassword);
System.out.println("Connection Established");
} catch (ClassNotFoundException | SQLException e) {
System.out.println("Connection not Established");
JOptionPane.showMessageDialog(Project2.this, e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
return con;
}
I think your way to connect is wrong. Instead of this:
con = DriverManager.getConnection(host + db, dbuser, dbpassword);
try this:
con = DriverManager.getConnection(host + db + "?user=" + dbuser + "&password=" +dbpassword);
Check this out, it may be useful.
http://dev.mysql.com/doc/connector-j/en/connector-j-usagenotes-connect-drivermanager.html
Related
I'm trying to connect my android studio to my AWS rds with JDBC.
public void GetText(){
TextView tx1 = findViewById(R.id.login_title);
ConnectionURL = "jdbc:mysql://awsrds-endpoint:3306/supplychain?user=admin&password=admin123";
try {
System.out.println("Loading driver...");
Class.forName("com.mysql.cj.jdbc.Driver");
System.out.println("Driver loaded!");
} catch (ClassNotFoundException e) {
throw new RuntimeException("Cannot find the driver in the classpath!", e);
}
Connection conn = null;
Statement setupStatement = null;
Statement readStatement = null;
ResultSet resultSet = null;
String results = "";
int numresults = 0;
String statement = null;
try {
System.out.println("Connecting ...");
conn = DriverManager.getConnection(ConnectionURL);
System.out.println("Connected");
readStatement = conn.createStatement();
resultSet = readStatement.executeQuery("SELECT S_ID FROM STAFF;");
conn.close();
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
}
}
and my error:
I/System.out: SQLException: Could not create connection to database server.
SQLState: 08001
VendorError: 0
The question here doesn't matter- do NOT connect to a db like this. In order to do this, you are putting your username and password in cleartext in your app. It is trivial to decompile the app and get it. This is unsafe. You should only ever access remote dbs via a webservice. That way your username and password do not need to leave your own devices.
I am trying connection with database but this error frustrates me . Can anyone help me out what is the problem here?
I want to connect to SQL Server from Eclipse.
public class JDBC_Test {
public static void SQLServerConnection() {
try {
String url = "jdbc:sqlserver://localhost:1433;DatabaseName=Northwind";
String user = "sa";
String password = "832Waseem#";
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection con = DriverManager.getConnection(url, user, password);
System.out.println("Connection Created Successfully.......");
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("select * from categories");
while (rs.next()) {
System.out.println(rs.getInt(1) + " " + rs.getString(2) + " " + rs.getString(3));
}
con.close();
System.out.println("Connection Closed Successfully.......");
} catch (Exception e) {
// System.out.println("Unable to create Connection reason is as below.......");
e.printStackTrace();
}
}
public static void main(String args[]) {
SQLServerConnection();
}
}
My Error:
com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user 'sa'. at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:196)
I am trying to create a connection with a database using JDBC on my android project. I am following a tutorial which says to import a jar and then create a connection in the activity. Everything is ok, but in the connection statement i get an error
Cannot resolve method 'createStatement()'
if I try to get into the reference of the method, it says
cannot find decleration to go to
This method comes from the jar i have imported? (jtds-1.3.1)
Is there anything else i am missing here?
#Override
protected String doInBackground(String... params)
{
Connection con;
String usernam = params[0];
String passwordd = params[1];
if(usernam.trim().equals("")|| passwordd.trim().equals(""))
z = "Please enter Username and Password";
else
{
try
{
con = connectionclass(un, pass, db, ip); // Connect to database
if (con == null)
{
z = "Check Your Internet Access!";
}
else
{
// Change below query according to your own database.
String query = "select * from owner where mail = '" + usernam.toString() + "' and password = '"+ passwordd.toString() +"' ";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
if(rs.next())
{
z = "Login successful";
isSuccess=true;
con.close();
}
else
{
z = "Invalid Credentials!";
isSuccess = false;
}
}
}
catch (Exception ex)
{
isSuccess = false;
z = ex.getMessage();
}
}
return z;
}
}
#SuppressLint("NewApi")
public Connection connectionclass(String user, String password, String database, String server)
{
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
Connection connection = null;
String ConnectionURL = null;
try
{
Class.forName("net.sourceforge.jtds.jdbc.Driver");
ConnectionURL = "jdbc:jtds:sqlserver://" + server + database + ";user=" + user+ ";password=" + password + ";";
connection = (Connection) DriverManager.getConnection(ConnectionURL);
}
catch (SQLException se)
{
Log.e("error here 1 : ", se.getMessage());
}
catch (ClassNotFoundException e)
{
Log.e("error here 2 : ", e.getMessage());
}
catch (Exception e)
{
Log.e("error here 3 : ", e.getMessage());
}
return connection;
}
I got the same problem with the close() method
All you've got to do is specify the class name fully:
java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/product","root","");
No need for a cast, and the error you're reporting will now go away, as the compiler will be looking for the method in the right class.
Or just rename your own class Connection.
I am trying to connect to a DB2 database using SSL on IBM Bluemix.
When I first tried to connect without SSL, it doesn't work. After reading the documentation, I have realized that it connects to the database with SSL enabled.
I tried using the following code to get it connect to the database:
public boolean connect() {
try {
String url = "jdbc:db2://" + serverName + ":" + port + "/" + dbName+
":securityMechanism=9";
connection = DriverManager.getConnection(url, userName, passWord);
st = connection.createStatement();
return true;
} catch (Exception e) {
System.err.println(e.getMessage());
}
return false;
}
Still I am not too sure on how to use the SSL certificate provided with the code above.
I tried searching for examples but most of the explanations are either unclear or used for another database system.
If you are using Liberty, a datasource is generated for you, and you can look it up using jndi.
#Resource(lookup = "jdbc/mydb")
private DataSource myDataSource;
Connection c = myDataSource.getConnection();
"mydb" is the name of the SQLDB service
https://developer.ibm.com/bluemix/2014/02/07/java-db2-10-minutes/
According to the SQLDB documentation, If you use the latest com.ibm.db2.jcc.DB2Driver with the JDBC connection, the current SSL certificate is bundled with the driver and does not need manually installing.
The following snippet shows you how to use the connection details available from VCAP_SERVICES to connect to SQLDB over SSL.
public class SSLTEST {
/**
* #param args
*/
public static void main(String[] args) {
String ServerName = "hostname or IP address";
int PortNumber = 50001;
String DatabaseName = "SQLDB";
String user = "your_user_id_from_VCAP_SERVICES";
String userPassword = "your_password_from_VCAP_SERVICES";
java.util.Properties properties = new java.util.Properties();
properties.put("user", "user ID that has access to SQLDB");
properties.put("password", "password for the user ID that has access to SQLDB");
properties.put("sslConnection", "true");
String url = "jdbc:db2://" + ServerName + ":"+ PortNumber + "/" +
DatabaseName + ":" + traceFileLocation + ";";
java.sql.Connection con = null;
try
{
Class.forName("com.ibm.db2.jcc.DB2Driver").newInstance();
}
catch ( Exception e )
{
System.out.println("Error: failed to load Db2 jcc driver.");
}
try
{
System.out.println("url: " + url);
con = java.sql.DriverManager.getConnection(url, properties);
if (con != null) {
System.out.println("Success");
} else {
System.out.println("Failed to make the connection");
}
con.close();
}
catch (Exception e)
{
if (con != null) {
try {
con.close();
} catch (Exception e2) {
e2.printStackTrace();
}
}
e.printStackTrace();
}
}
finally i use datasource to connect to the database.
Context ic = new InitialContext();
DataSource db = (DataSource)context.lookup("jdbc/MyDatabase");
I have created a SQL server 2012 database. I need to connect to the database by using Java app created on another pc. this is my code but I cannot connect to the database, and I get error: "Login failed. The login is from an untrusted domain and cannot be used with Windows Authentication." (my code is working when both Java app and SQL server running on the same PC).
Appreciate your help.
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String jdbcUrl = "jdbc:sqlserver://THINKPADPC:1433;databaseName=TestDB;integratedSecurity=true;";
conn = DriverManager.getConnection(jdbcUrl);
Have you tried sql server authentication. And pass username and password.
If you tryin windows authentication then it might be taking credentials from your(java) machine which has not been giving access on the hosted sql server machine.
Please Try this Connection and Change the ip, db , sa and password.
public class ConnectionClass {
String ip = "192.168.0.131";
String classs = "net.sourceforge.jtds.jdbc.Driver";
String db = "Andro";
String un = "sa";
String password = "Admnsql1~";
#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;
}`enter code here`
}