I have two domains.
In domain A, I have a PHP web site and in domain B, I have Java Website.
Now I want to use both database from both site.
How can I do that? I am using MySql 5.7.17
You could set up a third server dedicated to mySQL and share that database with the 2 web servers, or you can just run a mySQL database on each of those computers and use the IP address or domain name of them to connect to each other's server
Explanation:
You currently have a java website running and a php website running on one machine if i understand correctly.
What you need to do is download mySQL, and go through the tutorial to get the server up and running https://dev.mysql.com/doc/mysql-getting-started/en/
Then you need to download the mysql Java driver, and the mysql PHP driver
Then you need to use the drivers to connect to the same mySQL server from the code, which would be on localhost if you are doing it all on one machine.
MySQL is a server. It is its own thing, not a database like SQLite that you create in the java code or php code. You create and set it up separately as it's own server, and then any other server can connect to it
You can open and close a mysql connection any time.
mysql_connect(server, username, password);
Do some stuff with one database, then you can use:
mysql_close();
mysql_connect(server2, username2, password2);
as many times as you like.
Or you can use resource links:
$db1 = mysql_connect(server1, user1, passwd1);
$db2 = mysql_connect(server2, user2, passwd2);
But in this case, each mysql command needs to be referenced with the resource link:
mysql_query(query, $db1);
Related
I made an inventory system in netbeans using the language java and i connect it to derby as my database it is already working as a whole system but I want to have a client-server functionality what I mean is I want my program to have a server which holds the database(different computer) and different users with different computers which they can save/view data at the same time to the database means they are connected in one network.
Working with multiple connections to a single database.
What code can I use or method or do I have to import something?
I did some research and the only thing that I found is socket which can be used to create a chat between server and a client.
But I only tried the IP 127.0.0.1 for the client since I am making running the server and the client in the same computer.
And also can I open the connection of the server in the client form and send data like SQLQuery so I can save it in the database of the server?
Where can I see examples for these? Please help thanks
Yes, Derby supports a client-server configuration of your application.
Deploying your application in the client-server configuration is straightforward:
Deploy the Derby Network Server, for example by running the startNetworkServer script that is included with the Derby distribution.
Ensure that derbyclient.jar is in your application's CLASSPATH, and that you register "org.apache.derby.jdbc.ClientDriver" with the JDBC DriverManager.
Change your JDBC Connection URL from jdbc:derby:<db details> to jdbc:derby://<host:port>/<db details>.
If this is your first time using Derby, I strongly recommend working your way through the Derby tutorial at https://db.apache.org/derby/docs/10.12/getstart/index.html
For more information about running the Derby Network Server to service database requests for your applications, read the Derby Admin Guide: https://db.apache.org/derby/docs/10.12/adminguide/index.html
Use the IP 0.0.0.0 or for all connections in the server. The the connection url should include the name of the server or the ip address of the server in the network. When you use ip 127.0.0.1 or localhost derby can only accept connections to the database in the same machine, in this case localhost. All of this can be done by your network application server
I have created a standalone application as a school project. The major problem we are encountering is that since it has Java as front-end and MySQL as back-end (compulsory), and we have created a database that solely belongs to one computer, we cannot run the same project on different machines because it won't have the required database, the tables, or the same username and password we used to connect to MySQL.
So my question is **How can I connect to MySQL server in different Machines? **
For database and Tables, I could run a sql file, but that will happen when I would be connected to the MySQL server. Also I am developing the project at my home computer, and I want to run the project on different computers who are connected to my computer by no means .
You a following options
Shared drive : Attach database stored on remote shared drive to a local SQL Server read here
Connect to remote SQL Server instance from local computer - better if they are in same LAN - Steps here
If you want to package DB with app where you have predefined data and you dont want to save transactional data - use inMemory DB. They will load when you application starts up.
Already your application can work using different machine.
You have only to change the localhost string in your connection string with the IP of the MySQL machine :
DriverManager.getConnection("jdbc:mysql://localhost/database?"+ "user=sqluser&password=sqluserpw");
And make sure that remote access are enabled in your MySQL configuration. You can find more about it here.
Instead of using localhost in your database connection string, you should use the ip or aname of the database host
e.g.
jdbc:mysql://IP:3306/db?user=user&password=password
jdbc:mysql://A-NAME/db?user=user&password=password
Just make sure that port 3306 is open and that you have access on the system the databasse is hosted on
I am currently using Netbeans 8 and trying to make the MySQL database connect to the program without downloading MySQL on to the users computer or running a server, so the MySQL file must be local. How may I proceed is there a way to package with the jar of the program or should I proceed another way.
Also here is the code that connect to the database.
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/chutesandladders", name, password);
Statement update = conn.createStatement();
It is not possible to package a MySQL "file" in JAR. MySQL always runs as a server process that you can connect to using JDBC.
The JDB URL dbc:mysql://localhost:3306/chutesandladders from your question contains the hostname localhost and the port 3306 where the MySQL server is running.
If you want a client on a different machine to connect to this server, you must use the real hostname of the server in the JDBC URL. Of course you must allow access from this client to the server.
Edit: If you must use a relational database but can not access a server, you should use an embedded database. A widely used is H2.
As titled, I want to make my desktop java application to connect to an online mysql db ?! How can I reach it such connection to be able to add and retrieve data?!
Download the connector from here. Add it to your classpath and in the code:
// This will load the MySQL driver, each DB has its own driver
Class.forName("com.mysql.jdbc.Driver");
// Setup the connection with the DB
connect = DriverManager
.getConnection("jdbc:mysql://remoteUri/database-name?"
+ "user=user&password=userpw");
By all means, a JDBC connection is the way to go. But, you must make sure that the MySQL users have access to the database from another IP Address (i.e. your desktop application).
MySQL users are set up so that they can access the database on the local machine. Therefore, you have to allow access to the MySQL database from any host. Please see the following article which shows how to do that.
You could directly connect and let the queries run over the network (via JDBC)example: vogella.com
You build an RESTful Service, there are lots of tutorials as Example;
RESTful Web Services API using Java and MySQL
I am attempting to create a MySQL DB and Java client app for my home network. I haven't really had any experience with MySQL other than PHPMyAdmin for a website backend (also have used SQLite). I have downloaded the full MySQL installation and a test DB from the MySQL website. On the server machine I successfully connected to the DB as root. Not a difficult task.
Now I want to connect to the DB from my client PC, just to check I can. Eventually I will use the JDBC driver to connect from my Java client app, but before that I just want to check I can connect.
How should I do this? SHould I just install the MySQL command line program onto the client PC?
EXTRA INFO: forgot to add, I'm using Windows 7 on all my machines.
Yes, you could install the MySQL to get MySQL command line program and connect with it, but also you can use another MySQL client tool like PHPMyAdmin, dbForge Studio for MySQL or another one.
To connect from remote host you should create special accout for it, e.g. - 'user_name'#'your_host_name'. Find more information here -
Specifying Account Names
Account Names and Passwords