I am getting a java.sql.SQLException: No suitable driver found. I am trying to connect to a remote database. I think I have all my credentials correct.
Here is my code
public static void main(String[] args) {
String dbUrl = "jdbc:mysql:sshhost/db1";
try {
Connection myConn = DriverManager.getConnection(dbUrl, "usr", "");
Statement myStat = myConn.createStatement();
ResultSet myRs = myStat.executeQuery("select * from students");
while (myRs.next()) {
System.out.println(myRs.getString("last_name") + ", " + myRs.getString("first_name"));
}
} catch (Exception e) {
e.printStackTrace();
}
}
The host is the same remote host that I ssh into.
I log on to mysql as root and this requires no password so I left the last parameter ""
The database I want to use while logged into root is called db1.
I'm not sure if my parameters are valid.
You have not loaded a driver. JDBC need to have a driver loaded before a connection can be made. So make sure you load an apt driver class using:
Class.forName("driverClass");
If you are using Java 6 or above(which included JDBC 4), you don't need the above mentioned dynamic driver class loading.
In both the cases, make sure the driver class you are using is present in your classpath.
You'll need to update your classpath to point to the mysql jar file. The JVM can't find a suitable mysql driver.
Related
I'm working on OS X, Eclipse, Java 8 and MySQLWorkBench.
I realize with the last a database (can I say schema?), named "mydb" located at localhost:3306 (I don't know exactly what it means)...
Now I would like to connect via a java program to this db.
I'm trying with
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb");
It follows the error message
Exception in thread "main" java.sql.SQLException:
No suitable driver found for jdbc:mysql://localhost:3306/mydb
Can someone tell me what's wrong?
You need to download the jdbc driver and add it to your project
Download the driver from here
Example on how to add the driver in eclipse
Also you need to include the username and password in the connection statement and make sure you call the Class for name to get the driver loaded
Class.forName("com.mysql.jdbc.Driver");
DriverManager.getConnection(DB_URL,USER,PASS);
You haven't added required library to connect java application with MySql database.you can download it form here.After once you get downloaded , just extract zip wherever you want.And add it into your project library folder.
Right click on project goto property -> java build path -> add external jar .
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb","userName","userPass");
where userName is your database username and userPass is your password corresponding to that user.
After download and adding the Connector/J to your build path like #Jacques said.
Try this code:
try {
// Load the JDBC driver
#SuppressWarnings("rawtypes")
Class driver_class = Class.forName("com.mysql.jdbc.Driver");
Driver driver = (Driver) driver_class.newInstance();
DriverManager.registerDriver(driver);
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", getDbUser(), getDbPassword());
return conn;
} catch (Exception e) {
// TODO: handle exception
}
Where getDbUser() is your database username and getDbPassword() is your database password.
I am creating an application where you can manage an mySql database, at first i want the user to connect to the host by suppling the hostname, username and password. here is my code:
try {
Class.forName(ServerConnect.JDBC_DRIVER);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
System.out.println("Cannot register JDBC Driver...");
}
try {
conn = DriverManager.getConnection("jdbc:mysql://"
+ toServer.getHostname() + "/hrmanagement?" + "user=" + toServer.getUsername()
+ "&password=" + toServer.getPassword());
System.out.println("Connected to the server!");
} catch (SQLException e) {
System.out
.println("Not Connected to the server. Make sure username or password is correct!");
}
my question is, how can i connect without specifying the database so that i can let my user choose which database can he connect to. i tried removing "/hrmanagement?" but it didn't connect to the server. what can i do?
From the documentation:
The JDBC URL format for MySQL Connector/J is as follows, with items in square brackets ([, ]) being optional:
jdbc:mysql://[host][,failoverhost...][:port]/[database] ยป
[?propertyName1][=propertyValue1][&propertyName2][=propertyValue2]...
So, remove hrmanagement, note that the / and ?user... parts are staying
my question is, how can i connect without specifying the database so
that i can let my user choose which database can he connect to. i
tried removing "/hrmanagement?" but it didn't connect to the server.
what can i do?
Move the question mark to "?user=". I think the other answer had this correct.
In terms of changing databases, I believe you can use setCatalog() to use a different database.
From the Connection Page:
void setCatalog(String catalog)
throws SQLException
Sets the given catalog name in order to select a subspace of this
Connection object's database in which to work.
If the driver does not support catalogs, it will silently ignore this
request.
Calling setCatalog has no effect on previously created or prepared
Statement objects. It is implementation defined whether a DBMS prepare
operation takes place immediately when the Connection method
prepareStatement or prepareCall is invoked. For maximum portability,
setCatalog should be called before a Statement is created or prepared.
Parameters:
catalog - the name of a catalog (subspace in this Connection object's database) in which to work Throws:
SQLException - if a database access error occurs or this method is called on a closed connection See Also:
getCatalog()
It would probably be easier to use this version of the call, a little less confusing
public static Connection getConnection(String url,
String user,
String password)
throws SQLException
So your code would look like
try {
conn = DriverManager.getConnection("jdbc:mysql://" + toServer.getHostname(),
toServer.getUsername(),
toServer.getPassword());
conn.setCatalog("someDifferentDB");
System.out.println("Connected to the server!");
} catch (SQLException e) {
System.out.println(e.toString());
}
As a side note, getConnection will attempt to load the JDBC driver for you, so you don't really need to whole Class.forName try/catch block. That's a vestige of old code that's not needed for most of the modern JDBC drivers. There's still some around that need it, but I believe mysql conforms to the newer style. Just make sure the driver is in your classpath on the command line
java -cp \path\to\mysql\driver\driver.jar myProgram
I am trying to write a program in Java that in order to work, needs to have access to a MySQL database. Below is the code for the program so far, with the I.P. address, username, and password removed for security reasons. The problem with this code is that whenever it is run, it always fails to connect to the server, even though I know that it is running and that the password that the login information is correct. My friend found a program online that checks to see if your database can be connected to, and whenever he runs it, it always outputs "Where is your MySQL JDBC Driver?" What is the MySQL JDBC driver? I am assuming that it is the cause of my problem, but I don't know that for sure. Can anyone explain this to me?
import java.sql.*;
public class main
{
public static void main(String[] args)
{
// Store the information to connect to the MySQL server in handy variables.
String url = "jdbc:mysql://(IP REMOVED FOR SAFETY):3307/";
String dbName = "attendance";
String driver = "com.mysql.jdbc.Driver";
String userName = "(USERNAME REMOVED FOR SAFETY)";
String password = "(PASSWORD REMOVED FOR SAFETY)";
// Now let's connect!
try {
Class.forName(driver).newInstance();
Connection conn = DriverManager.getConnection(url+dbName,userName,password);
} catch (Exception e) {
System.out.println("Could not connect to database!");
}
}
}
The problem could be that MySQL driver is not in your classpath.
Please look at this: http://dev.mysql.com/doc/connector-j/en/connector-j-installing-classpath.html
The MySQL JDBC driver is called MySQL Connector/J. This jar needs to be added to the classpath for your program to run.
The driver can be downloaded from: http://dev.mysql.com/downloads/connector/j/
I ve installed MySQL (last update).
I need to code, that ll create & establish a connection with SQL DB
& manage the DB(using SELECT, INSERT, CREATE).
I did everything but, I am not able to create connection. I've also installed the MySQL/J connector, I just extracted the .zip pack in a folder & added the folder path in Variables).
Can anyone tell me wat is meant by URL in the below line?
Connection connection = DriverManager.getConnection(url, username, password);
I ve tried this:
String url = "jdbc:odbc:sqlserver://localhost:3306/myfirstdb";
Connection con = DriverManager.getConnection(url, "root", "1234");
But it's not working. I am unable able to understand the term 'URL'.
Can anyone explain, the meaning of 'url' and wat should be done to connect to a SQL server from Java.
Update:
This is the Full code. It still cannot connect.
import java.sql.*;
public class TestDriver {
public static void main(String[] args) {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");//This s wat actually i did for connection
System.out.println("Driver Loaded Succesfully");
}
catch (Exception e){
System.out.println("Unable to Load Driver!!!");
}
try {
Class.forName(com.mysql.jdbc.Driver"); // initialise the driver
String url ="jdbc:mysql://localhost:3306/myfirstdb";
Connection con = DriverManager.getConnection(url, "root", "1234");
System.out.println("connection Established");
}
catch(Exception e) {
System.out.println("Couldnt get connection");
}
}
}
Can you tell me wat is the purpose of MySQL Connector/J?
In the question you seem to be using a MySQL jdbc driver with a SQL Server jdbc URL. This won't work.
If you are using a MySQL database:
Class.forName("com.mysql.jdbc.Driver"); // initialise the driver
String url ="jdbc:mysql://localhost:3306/myfirstdb";
If you are using a SQL Server database you are going to need a completely different jdbc driver. jTDS is open source and a good option. Include the jtds.jar file in your classpath and use something like:
Class.forName("net.sourceforge.jtds.jdbc.Driver"); // initialise the driver
String url = "jdbc:jtds:sqlserver://localhost:1433/myfirstdb";
Here's an extract from your code:
} catch (Exception e) {
System.out.println("Couldnt get connection");
}
You should never suppress exceptions as long as you don't understand its cause. Replace it by at least:
} catch (Exception e) {
System.out.println("Could not get connection");
e.printStackTrace();
}
Or maybe
} catch (Exception e) {
throw new RuntimeException("Could not get connection", e);
}
Either way, you should see the exception type, message and trace. In your code snippet the possible exceptions are ClassNotFoundException and SQLException. The first one would mean that the driver is not properly placed in the classpath. The second one would mean that connection cannot be obtained. The exception message and/or trace should tell in detail about the underlying root cause of the problem.
You should always observe exceptions. They tell something about the cause of the problem. You know, once a cause is understood, the solution is nothing more than obvious :)
See also:
Short MySQL/JDBC tutorial - Contains explanation about exception causes.
Further,
Can anyone tell me wat is meant by URL in the below line?
An URL is an Uniform Resource Locator. It's a common way to locate (identify) unique resources in computer systems and networks. The URL syntax for the MySQL database is explained in the documentation of the JDBC driver.
Can you tell me wat is the purpose of MySQL Connector/J?
It's the JDBC driver. The JDBC API exist of almost only interfaces. The DB vendors should provide their own concrete JDBC API implementation, which is the JDBC driver. With a JDBC driver you'll be able to connect a specific database using JDBC API.
If its MS SQL Server,
String driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
Class.forName(driver);
String url = "jdbc:microsoft:sqlserver://host:1433/database";
Connection conn = DriverManager.getConnection(url, "username", "password");
For more info, see this to get started with Microsoft JDBC.
You can use any of the two JDBC drivers for MSSQL:
Microsoft SQL Server JDBC Driver
2.0
jTDS
For MS SQL Server driver 2.0, use
URL: jdbc:sqlserver://server:port; DatabaseName=dbname
Class name: com.microsoft.sqlserver.jdbc.SQLServerDriver
For MySql & Java, see this on SO.
You forgot a " at Class.forName(com.mysql.jdbc.Driver");
It should be
Class.forName("com.mysql.jdbc.Driver");
My configuration:
windows XP SP3
JDBC 2005
MS SQL Server 2008 Express, exposed via tcp/ip on port 1433
sqljdbc.jar in class path
I tried:
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
con = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433/SQLEXPRESS2008;databaseName=Test;selectMethod=cursor", "sa", "");
}
catch (Exception e) {
e.printStackTrace();
}
But it always throws an exception:
java.sql.SQLException: No suitable driver
I also tried the following urls:
localhost:1433/SQLEXPRESS2008
localhost/SQLEXPRESS2008
localhost
Same results.
Any help?
You have the wrong URL.
I don't know what you mean by "JDBC 2005". When I looked on the microsoft site, I found something called the Microsoft SQL Server JDBC Driver 2.0. You're going to want that one - it includes lots of fixes and some perf improvements. [edit: you're probably going to want the latest driver. As of March 2012, the latest JDBC driver from Microsoft is JDBC 4.0]
Check the release notes. For this driver, you want:
URL: jdbc:sqlserver://server:port;DatabaseName=dbname
Class name: com.microsoft.sqlserver.jdbc.SQLServerDriver
It seems you have the class name correct, but the URL wrong.
Microsoft changed the class name and the URL after its initial release of a JDBC driver. The URL you are using goes with the original JDBC driver from Microsoft, the one MS calls the "SQL Server 2000 version". But that driver uses a different classname.
For all subsequent drivers, the URL changed to the form I have here.
This is in the release notes for the JDBC driver.
Download the latest JDBC Driver (i.e. sqljdbc4.0) from Microsoft's web site
Write the program as follows:
import java.sql.*;
class testmssql
{
public static void main(String args[]) throws Exception
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection con=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;
databaseName=chapter16","sa","123");//repalce your databse name and user name
Statement st=con.createStatement();
ResultSet rs=st.executeQuery("Select * from login");//replace your table name
while(rs.next())
{
String s1=rs.getString(1);
String s2=rs.getString(2);
System.out.println("UserID:"+s1+"Password:"+s2);
}
con.close();
}
}
Compile the program and set the jar classpath viz: set classpath=C:\jdbc\sqljdbc4.jar;.; If you have saved your jar file in C:\jdbc after downloading and extracting.
Run the program and make sure your TCP/IP service is enabled. If not enabled, then follow these steps:
Go to Start -> All Programs -> Microsoft SQL Server 2008 -> Configuration tools -> SQL Server Configuration Manager
Expand Sql Server Network Configuration: choose your MS SQL Server Instance viz. MSQSLSERVER and enable TCP/IP.
Restart your MS SQL Server Instance. This can be done also from the right click menu of Microsoft SQL Server Management Studio at the root level of your MS SQL server instance
If your databaseName value is correct, then use this: DriverManger.getconnection("jdbc:sqlserver://ServerIp:1433;user=myuser;password=mypassword;databaseName=databaseName;")
The latest JDBC MSSQL connectivity driver can be found on
JDBC 4.0
The class file should be in the classpath. If you are using eclipse you can easily do the same by doing the following -->
Right Click Project Name --> Properties --> Java Build Path -->
Libraries --> Add External Jars
Also as already been pointed out by #Cheeso the correct way to access is jdbc:sqlserver://server:port;DatabaseName=dbname
Meanwhile please find a sample class for accessing MSSQL DB (2008 in my case).
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class ConnectMSSQLServer
{
public void dbConnect(String db_connect_string,
String db_userid,
String db_password)
{
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection conn = DriverManager.getConnection(db_connect_string,
db_userid, db_password);
System.out.println("connected");
Statement statement = conn.createStatement();
String queryString = "select * from SampleTable";
ResultSet rs = statement.executeQuery(queryString);
while (rs.next()) {
System.out.println(rs.getString(1));
}
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args)
{
ConnectMSSQLServer connServer = new ConnectMSSQLServer();
connServer.dbConnect("jdbc:sqlserver://xx.xx.xx.xxxx:1433;databaseName=MyDBName", "DB_USER","DB_PASSWORD");
}
}
Hope this helps.
Named instances?
URL: jdbc:sqlserver://[serverName][\instanceName][:portNumber][;property=value]
Note: backward slash
You can try the following. Works fine in my case:
Download the current jTDS JDBC Driver
Put jtds-x.x.x.jar in your classpath.
Copy ntlmauth.dll to windows/system32. Choose the dll based on your hardware x86,x64...
The connection url is: 'jdbc:jtds:sqlserver://localhost:1433/YourDB' , you don't have to provide username and password.
Hope that helps.