Background: Working on an application to be run on an Apache server hosted by Network Solutions. Friend/Customer insisted on using an Access Database instead of SQL database.
Current Problem: Wrote a Java test program to make sure I can connect to the database before I dive head first into writing the whole backend. When I run this code on the JVM of the apache server the final product will be hosted:
import java.sql.*;
import java.io.*;
public class test {
public static void main(String[] args) {
try {
Class driverClass = Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
DriverManager.registerDriver((Driver) driverClass.newInstance());
// set this to a MS Access DB you have on your machine
String filename = new File(".").getCanonicalPath() + "/ITEMS.mdb";
String database = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=";
database+= filename.trim(); // add on to the end
// now we can get the connection from the DriverManager
System.out.println(database);
Connection conn = DriverManager.getConnection( database );
} catch (Exception e) {
System.out.println("Error: " + e.getMessage() + " " + e.getLocalizedMessage());
e.printStackTrace();
}
}
}
I get a null pointer exception on the line Connection conn= DriverManager.getConnection( database)
Here is the stacktrace:
java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.initialize(JdbcOdbcDriver.java:436)
at sun.jdbc.odbc.JdbcOdbcDriver.connect(JdbcOdbcDriver.java:153)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:207)
at test.main(test.java:20)
To write this test I used this as my primary source: http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=2691&lngWId=2
String strconnect="jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb, *.accdb);DBQ="
Sring filename="some path";
StringBuilder a =new StringBuilder();
a.append(strconnect);
a.append(filename);
String db = a.toString();
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c= DriverManager.getrConnection(db,"","")
Statement stmt = c.createStament();
String query = "some query";
stmt.executeQuery(query);
c.close();
Never get canonical Path, Either Specify the path of the access file or use JFile Explore and get path
also don't forget to close connection
Since you mention apache, I will presume that the server is running Linux or BSD.
In that case, please have a look at the following:
Connecting to access database from linux
Good Linux ODBC drivers for Access are expensive! (US$850 for a single machine!)
There is no default drivers for Access provided on linux, and the JDBC ODBC won't work unless you install one.
Unless there is a very special and overwhelming good reason for using an Access database as the backend to a website on a linux server, tell your friend that this is not technically or even economically coherent.
If you need a lightweight database on the server, use SQLite: it's free, there is good support for connecting to it from Java in linux, there is good tooling (even browser plugins), and you can always convert that database to Access if your friend want to get an Access backup once in a while.
Otherwise, go for PostgreSQL or MySQL like everyone does (generally for a good reason).
Related
I know this has been asked a hundred times and I think I have read all the posts and tried every variation of the solutions. I'm using NetBeans and new to it. I'm sure I'm just missing some small step because it seems like its just not seeing the driver that I added to the library. This is the first time I have tried to connect to a database so please be gentle.
try
{
String host = "jdbc:sqlserver://Server:1433;Database";
String uName = "User";
String uPass = "Password";
Connection con = DriverManager.getConnection(host,uName,uPass);
System.out.println("Your are connected to SQLServer 2014");
}
catch (SQLException err)
{
System.out.println(err.getMessage());
}
You forgot to register the jdbc driver class.
Call
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
before calling Connection con = DriverManager.getConnection(host,uName,uPass);.
It will resolve the issue.
UPDATE
In documentation for new jdbc drivers it is declared that this step is not necessary. But in practical work, I have found that this step is required even for new drivers, otherwise you will get "No suitable driver found" error. This error occurs sometimes, for example it does not occur when you are making and running a console jar-application, but occurs when you have created and deployed a web-application.
So, I advise to register the jdbc driver class before getting the database connection via DriverManager.getConnection() call.
I am trying to connect to one of my MySql Databases through a System DSN I set up. The DSN is set up correctly with my SSL certs, username, password, port, and the databases populate the DSN database drop down and the "Test" connection passes. I can't seem to get a connection in Java. I have spent 2 days looking through some examples on Stack but they all refer to an Access database and using JDBC-ODBC bridge which is no longer available in Java 8. I tried using UCanAccess with Jackcess but I have gotten no where. The code below is what I have been tinkering with the last few hours. I normally connect to MySql databases with PHP and receive result in JSON or directly with JDBC driver but for this project neither are really an option. Any ideas. I appreciate the help.
//String username = "<username>";
//String password = "<password>";
//String database = "<database_name>";
try {
Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
//Connect to cllients MySql Database
Connection conn = DriverManager.getConnection("jdbc:ucanaccess:" + database);
//Call VerifyLabel(<MAC>,<MODEL>); Call provided client
CallableStatement cStmt = conn.prepareCall("{CALL verify(?, ?)}");
//MAC
cStmt.setString(1, "mac address");
//model
cStmt.setString(2, "model");
cStmt.execute();
//Getting results from "Status" column
ResultSet rs1 = cStmt.getResultSet();
//Iterate results and print.
while (rs1.next()) {
System.out.println(rs1.getString("Status"));
}
//Close connection conn
rs1.close();
} catch (SQLException ex) {
Logger.getLogger(CambiumStoredTest.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(CambiumStoredTest.class.getName()).log(Level.SEVERE, null, ex);
}
Using MySql Driver:
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql:"+ database);
also tried:
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/"+ database);
Error for MySql Driver:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
1) DSN is most commonly assocatiated with ODBC (and often with MS-Access). Hence all the links. ODBC is NOT required for a DSN.
2) Do NOT use Ucanaccess. Use J/Connector for mySQL.
3) Make sure you can communicate with mySQL from the command line. Then focus on getting a small "hello world" JDBC app to connect. Your second and third examples look OK. Be sure to check the mySQL logs for any warnings/errors.
Well, after an entire day of trying to get this to work and sleeping on it for a couple hours I finally got it to work. UCanAccess and mysql-connector did not work. The easiest thing since no other method of connecting to this clients database was acceptable was to push this application in Java 7 rather than 8. This allowed me to Coo=nnect to my DSN with no problems. I understand that this method is not the best solution but it is what is working flawlessly and efficiently. Also, instead of using some rigged up 3rd party libs and jars, I am able to use Connector/J. Thanks everyone for trying to help me. Just incase anyone else runs into this issue, this is how I made it work.
Develope app in Java 7 - not 8.
Set Up System DSN
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//You do not need to provide username or password if it is setup in DSN
Connection conn = DriverManager.getConnection("jdbc:odbc:"+ database);
I am trying to connect to a database in Mariadb through a simple java application but the connection is told to be unsuccessful and an Exception is thrown. I have done the similar connection using mysql and it was working correctly. The problem is maybe with the driver here.
try{
Class.forName("org.mariadb.jdbc.Driver");
Connection connection = DriverManager.getConnection(
"jdbc:mariadb://localhost:3306/project", "root", "");
Statement statement = connection.createStatement();
String uname="xyz",pass="abc";
statement.executeUpdate("insert into user values('"+uname+"','"+pass+"')");}//end of try block
I looked up the internet for the help and came by that driver class provided by the MariaDB Client Library for Java Applications is not com.mysql.jdbc.Driver but org.mariadb.jdbc.Driver! I changed it accordingly but it seems the problem is with the very first line inside the try block. The driver is not loading at all.
Also, I have added the mysql jar file to the libraries of my java application as in the screen-shot below. Please help me through this.
It appears that you are trying to use jdbc:mariadb://... to establish a connection to a MariaDB server instance using the MySQL JDBC Driver. That probably won't work because the MySQL JDBC Driver would use jdbc:mysql://..., regardless of whether it is connecting to a MySQL server or a MariaDB server. That is, the connection string must match the driver that is being used (rather than the database server being accessed).
The MySQL and MariaDB drivers are supposed to be somewhat interchangeable, but it only seems prudent to use the MariaDB connector when accessing a MariaDB server. For what it's worth, the combination of mariadb-java-client-1.1.7.jar
and
Connection con = DriverManager.getConnection(
"jdbc:mariadb://localhost/project",
"root",
"whatever");
worked for me. I downloaded the MariaDB Client Library for Java from here:
https://downloads.mariadb.org/client-java/1.1.7/
which I arrived at via
https://downloads.mariadb.org/
Additional notes:
There is no need for a Class.forName() statement in your Java code.
The default configuration for MariaDB under Mageia may include the skip-networking directive in /etc/my.cnf. You will need to remove (or comment out) that directive if you want to connect to the database via JDBC because JDBC connections always look like "network" connections to MySQL/MariaDB, even if they are connections from localhost. (You may need to tweak the bind-address value to something like 0.0.0.0 as well.)
An additional note:
Exploring the MariaDB JDBC driver, I found this inside the url parsing file:
Project: https://github.com/MariaDB/mariadb-connector-j.git
File: src/main/java/org/mariadb/jdbc/UrlParser.java
public static UrlParser parse(final String url, Properties prop) throws SQLException {
....
if (url.startsWith("jdbc:mysql:")) {
UrlParser urlParser = new UrlParser();
parseInternal(urlParser, url, prop);
return urlParser;
} else {
if (url.startsWith("jdbc:mariadb:")) {
UrlParser urlParser = new UrlParser();
parseInternal(urlParser, "jdbc:mysql:" + url.substring(13), prop);
return urlParser;
}
}
As you can see, the string "jdbc:mariadb:" is always replaced with "jdbc:mysql:" internally. So when it comes to the MariaDB driver, whether it is :mariadb: or :mysql: it always gets parsed as "jdbc:mysql:".
No difference.
if (url.startsWith("jdbc:mariadb:")) {
....
parseInternal(urlParser, "jdbc:mysql:" + url.substring(13), prop);
....
Here's my code:
import java.sql.*;
public class DBConnector {
private static Connection conn;
public static void connectToDB()
{
//load the driver
try
{
Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println ("Driver successfully loaded");
}
catch (ClassNotFoundException c)
{
System.out.println ("Unable to load database driver");
}
//connect to the database
try
{
String filename = "TopYouTubeVideos.mdb";
String database = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=";
database += filename.trim () + ";DriverID=22;READONLY=true}";
conn = DriverManager.getConnection (database, "", "");
System.out.println ("Connection database successfully established");
}
catch (Exception e)
{
System.out.println ("Unable to connect to the database");
}
}
The output is:
Driver successfully loaded
Unable to connect to the database
This has worked on a different computer than mine, connecting to the database through exactly the same code... does anyone have any idea why?
Thanks in advance :)
EDIT: I'm running Access 2007, Windows 7 64bit
By checking for the error, I get: java.sql.SQLException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
From a little bit of research it seems this is a problem with my 'data source name'. I put my database file in the project folder, and the name is correct. Why is it not finding it?
EDIT: No, the database was the same on both computers. In the same folder as well.
EDIT: I think I may need to create a system dsm. Following the instructions on the internet dosent work though, because I dont have the same files as them..
EDIT: I've tried to install that but it hasn't made a difference. My version of access is 64 bit alongside my version of netbeans..
Try installing a database engine + JVM that are both running in the same archeticture (i.e. 32bit), otherwise, you would receive a mismatch exception. I assume your JVM is 64bit but your database engine is not, so try installing a 64bit engine from the following link:
http://www.microsoft.com/en-us/download/details.aspx?id=13255
I'm writing a desktop java app on that I want to connect to a MySQL database on a server. Here is the code to do that:
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
private static Connection getDBConnection() throws SQLException, InstantiationException, IllegalAccessException, ClassNotFoundException {
String username = "myUserName";
String password = "myPassWord";
String url = "jdbc:mysql://www.domainName.com:3306/databaseName";
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Connecting to database...");
//hangs here
Connection conn = DriverManager.getConnection(url, username, password);
return conn;
}
When I run this, it hangs on the DriverManager.getConnection() call. Why does this happen? Is my URL malformed?
(I'm not getting any error messages, but the program doesn't respond as if in an infinite loop. I haven't waited longer than 90 seconds to see if the connection will ever be established.)
Also, what is the purpose of the Class.forName() call? How does it work?
I am almost entirely certain that the username and password are correct. (I just used userName and passWord as placeholders above.)
UPDATE: I fixed the port number, and now I get this error:
Cannot connect to database: java.sql.SQLException: Access denied
for user 'userName'#'r236059121.resnet.mySchool.edu' (using
password: YES)
Does this mean I need to configure settings on the database? Or does it mean that I've got the credentials wrong? (They work for PHP scripts deployed on the server that contains the database.)
SOLUTION: Added the host above to the Access Host list on cPanel.
Seems to me like your database is not reachable and you will probably get an error when the call runs into a timeout. Are you sure the hostname and port are right and reachable from your machine?
You don't need the newInstance() at the end of Class.forName(). Class.forName() triggers the classloader to load that class, which in turn triggers some internal registration code in the driver which makes the driver available.
I think the line should just be
Class.forName("com.mysql.jdbc.Driver");
(close the .newInstance() bit)
That causes the driver to register itself with the driver manager and allows the driver manager to pick a driver for the database url.
I think the hang is caused by a DNS problem, or some other reason why your db cannot be reached. By default, the MySQL JDBC driver does not time out for a connection. See http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-configuration-properties.html and look for connectTimeout.
In your code, you have
String url = "jdbc:mysql://www.domainName.com:portNumber/databaseName";
I take it that you used a real port there? By default, it should be 3306. You can test with the test database which is present in virtually all mysql instances:
String url = "jdbc:mysql://www.domainName.com:3306/test";
You also wrote:
String username = "myUserName";
String password = "myPassWord";
Obviously you should use real credentials here too. Ask your dba what they are. If you're the DBA then...well you should probably read up on MySQl administration :) Seriously when you installed MySQL you were probably promted for a password for the root user. Use those (in the obvious way)
In real code you should probably not hang when the db is not there. So I advise adding a connectTimeout option like so:
String url = "jdbc:mysql://www.domainName.com:3306/test?connectTimeout=3000";
(connectTimeout is in milliseconds, so this would time out after 3 seconds)
Rosarch - You are not able to connect to your DB since its unreachable.
It'll timeout after a while.
Try telnetting -
telnet <IP-OF-domainName.com> <PortNumber>
You'll mostly see that it shows timeout.
Solutions -
1.) If you are behind a firewall, you need to punch a hole to allow access
2.) If you are behind a proxy, need to configure it to allow access