I am studying Information Technology at a local college. I am currently doing a Java project for one of my Modules. We are expected to make a Java application that communicates with a Microsoft Access database. I am working in a group, and all of us are assigned to code separate functions of the software. However, we need to share one database. We are currently using ODBC on our individual computers and are using JDBC to connect to the database on the local machine. What we have thought is to just work on separate Microsoft Access databases and then just combine them later on. But I think that's not the best way. Is there a way that will allow me and my group members to have a centralized database, to which all of us can connect and make our queries? Is this possible by hosting the Microsoft Access database somewhere online, and then connecting to it from inside the Java software. Please help me out, as I have no idea how to get a centralized Microsoft Access database.
If you want to get rid of this by using Microsoft Access is because that's the easiest way out for you and your group to solve this kind of problem but I'd rather suggest you to use the database using a database provided by Java Derby database, it's quite help you to short your code within the server. Maybe I will suggest you to use Netbeans as a GUI and the Derby to control the database.
So what's your core problem is that a programming side or configuration and control within the hosting ? Thanks
Related
I want to make a website done in Java language. This is for my own learning purpose. Since I am doing things myself I tend to get confused.
If there is a Login Form wherein a huge number of people all around the world need to feed their login details and that data gets stored.
To achieve this, do we need to have a database hosting?
Can you please guide the exact steps for this?
I know Core Java and MySql Database Basic knowledge but I have not done both app connection procedure.
I only know to code in Java and SQL queries. I had done an earlier basic application that runs only on a system (This was done in VB.NET and MySQL).I did this a decade back. Now that I am back to programming after a decade, I am bit confused about how to make this connection in a way that the Login form stores the details from the website to the database. The database should be MySql or some data hosting site? I will be trying this out on Windows System in Eclipse Neon. Let me know if you need further details.
Now that you are well versed with Java and MySQL, you can learn about Apache Tomcat and Struts 2.
With these, you can make an application that serves your purpose.
At the front-end, you'll have jsps with the login form.
With struts, you can map actions (like button clicks) to java classes. In these Java classes, in the backend, you'll have the code to connect to DB and store data.
Hope this guides you make your web application. :)
You don't need a database hosting but you need a database server configured properly at your system for localhost development.There are many sites guiding you to make a full java app using jdbc and jsp step by step you can get there easily.They will guide you to configure your database server.
I am currently working on a university project to set up a database and a java GUI for the company I work at.
My idea was to use JavaDB (JDK-integrated Derby) or MySQL as database engine and connect to a Java application that I code using DBMC.
Ideally, both the Database and GUI Java Application would simply be saved on the company's network drive in the same folder, without the need of a permanently running an SQL server or something like that.
So when a user started up the Java application, the database (server) would start up too and close when the Java Application is closed.
I was messing around with Derby Embedded, but found that it was fairly impractical, lacking a useful gui administration tool like MySQL or multi-user access (not the first priority) and accessing it via SQuirreL didn't succeed very well either.
Do you know a better solution to this?
Would it be possible to do this with MySQL for example?
I hope, I explained everything okay.
I am in a situation where I am being asked to make a single WAR file that runs Wordpress. Using Quercus, Tomcat and httpd+mod_rewrite I was able to make a WAR file containing everything except the database, which I ran externally. However, I'm not sure how I might go about removing the dependency upon an external database (and, frankly, this whole endeavor seems like a bad idea to me).
This article describes how Wordpress has been successfully deployed on the Google App Engine and hence without needing MySQL, but this was done using JPA.
Instead of embedding a MySQL instance, if I could use an external MSSQL database connection instead that would be fine too. (This is an old post, but it seems to suggest that real MySQL is the only supported database for Wordpress.) Is the most viable option to attempt to replace each MySQL call in the Wordpress source code to a MSSQL call? Is there some kind of compatibility/translation layer that I could use instead? (I saw this question, but the solution will not work in my case.)
UPDATE: I came across MySQL-JE, but it looks out of date and not quite complete enough (not sure how I would tell Quercus/PHP to communicate with it). Has anyone used it? If so, do you think it would help solve this problem?
Embedded Database
According to this chart, MySQL is not built for embedded use.
I can point you to two pure Java database engines for embedding in a Java app. Both are open-source, free of cost, and under active development. Both have a good pedigree with a long line of database development history behind them.
H2
Derby
WordPress Requires MySQL
According to this WordPress Requirements page, specifically MySQL is required. That's annoying. The main point of SQL is to avoid database-vendor lock-in.
I'd like to ask for your opinion on local databases for a java application i'm developing.
Its veterinary application, meaning I'll need to store Customer, Pet and Medical History details for a start. I know how to use JDBC but I've only used it online in applets.
So, I really dont know much about local solutions and how those gonna work when I'll publish the application in a .jar, so please guide me. Would MySQL still work?
Thanks!
This is fairly general question and light on details and MySQL sounds like it would work here. If this is for local-only access and a typical client-server model is not needed then I'd encourage looking into a database engine that can be loaded directly in the JVM. One of the benefits is that there is no need to install any separate database components and the JARs for the entire database engine can be packaged in your application.
Below are a few of these:
Apache Derby
HyperSQL
H2
SQLite - Some Java wrappers around the C library are available but there are not any pure Java JDBC drivers available for this that I am aware of.
I realize that it is not difficult for developers to configure MySQL for local use but it could lead to a number of support issues for end users. It may be possible to script the installation to preconfigure a large amount of it but I am not sure of the details of that and it would be an additional item for you to work out when packaging the application.
Some general questions about utilizing MySQL for this are shown below. It may very well be the best way to go but these are just some things to consider. Most of these are not really specific to the development of the application and are more on the support side of things. Utilizing a database engine noted above can eliminate all or many of these.
Will multiple computers every have to connect simultaneously to the same database?
What MySQL password do you use?
Do you recommend that end users all use the same one which may not be good security?
Or do the end users need to create one in which case you may need to deal with forgotten passwords and the end user having to configure the password in your application?
Do your end users run antivirus software that may interfere with the database connection?
What if they have another program that uses MySQL that is already using the default port?
I have a project this year. It is about developing a Java application with a database for sharing and validating documents between the manager, secretary and head of finance.
My question is: How to make the database accessible by all, since the application will be installed on computers that I mentioned above, do I have to install it (the database) on these computers? The constraints of consistency and integrity of the database will be violated. The users will not have the same copy after each update!
Is there a possibility (or technology in Java) to put the database on the web and there will be accessible by all, or make it accessible from a computer that I realize as a server (client-server).
I would be grateful for your help or giving links for Tutorials.
How to make the database accessible by all, since the application will be installed on computers that I mentioned above, do I have to install it (the database) on these computers? The constraints of consistency and integrity of the database will be violated. The users will not have the same copy after each update!
Your question suggests that you will need one database on one computer. Let's call it a DB computer. I'd suggest this be a server, that no one from regular staff, such as secretary, manager, etc... can access.
Having one central database will eliminate your worries about integrity violation.
Now, you have two options. You can make a web application that your users will use to interact with your system. This is a more modern approach, since you'll have a 3 tier system:
users will access your application via a browser
the web application itself is stored on an application server, and it is accessing the database
the database is the backend part
The second option is making a desktop application and deploying it to everybody's computer that will use it; and afterwards making it connect to the database for interacting with it.
The first option is easier when you want to expose your application to a large number of users (and to the web), but know what you're doing when doing stuff like this, since you have to take security very seriously.
If you go the first route, you will need a few things:
First, a database. Use what you can, but if you need free and high quality databases, use PostgreSQL or MySQL.
Second, an application server. I suggest using Tomcat or GlassFish.
Now, you need to develop your application using JavaEE. There is a wealth of information about this, so I hope this will help you in the beginning and point you in the right direction.
Note that Tomcat doesn't support Java EE fully, but a subset of it. And this subset is surely more than enough for what you need to accomplish.
If I understand you correctly, you are looking for ways to implement a client-server system, where several clients on distinct computers each connect to a central server (or cluster of servers) hosting a DB. In Java, usually (but not necessarily) the DB is inside a web application, and the clients are lightweight web clients - in this case it is usually called an enterprise application.
Java has a whole dedicated SDK for this, called Java Enterprise Edition. You may find many questions dealing with this on SO, here are a few which I think may be especially helpful:
Is the offical Sun Java EE tutorial the best way to learn how to make Java web apps?
What to learn for making Java web applications in Java EE 6?