Scenario:
We have a PHP/MySQL based corporate web portal and a separate MS SQL database on a remote server which could be accesed by a 3rd party vendor Java application(web client communicating with the MSSQL database).
Requirement:
I would like to get rid of that Java application and transfer all functionalities to the PHP web portal and I need to figure out the queries as I don't have the source code of that Java application and there is no way to reach the vendor to ask.
Is there any way I can capture the queries that Java application is sending so I can use those in my PHP scripts?
Maybe tracing last queries from MSSQL somehow? Or
Somehow see what the Java application emits to the database in some way?
While you can log incoming queries coming into the server (How to see query history in SQL Server Management Studio) you are still going to rewrite most of the queries as I'm sure most of them will be dynamic. You will simply see the end result in the log like this:
select * from users where id=5
While in the php code it will be a mysqli or pdo function that binds the 5 value to a prepared statement. So you will have to figure out why or how the java application came up with the query it did.
Related
I developed a java swing application by using hibernate connection and MS SQL server for database. Application is working fine. And I know the way to create and EXE and the installer for application.My question is, how I install this application to another computer with database. Should I install the SQL server on that computer or is there any way to use the db without installing the whole SQL server in that computer.
As far as i know there is no way of using database without installing the SQL Server, unless you configure in a way that the application will communicate with the db on your pc, but that's complicated
A different approach to this would be for you to make a view in the database and extract the data you need to a csv file, include that file in the resources folder of the application and then use Lucene to query over it
Take a look at how to get started: here
When you need to update the data in the file you can release updates for the application that would include these changes in the csv file/s
When I want to create an SQLite external database for android application, do I have to have a server with database that is always running?
Yes, since it will be on a server. If the server isn't running, then your application won't be able to get any data from the database.
There's a very important distinction that we're missing here - what it means to have a remote database.
SQLite is a flat-file embedded database engine. You don't have a separate process running SQLite in the background like you would one for MySQL or PostgreSQL or Oracle, nor would you really want to - SQLite as a database is pretty limited in what it can do.
If you say that you're going to have a remote SQLite database, then that implies that you have some server somewhere that writes to and reads from this flat-file database. If you can finagle that somehow, and make it secure, then more power to you - and yes, you could have this accessible remotely for your intents and purposes. Trust me though, you wouldn't want to.
What you're likely looking for is a way to remotely run MySQL or PostgreSQL instead, as these are proper database management systems (DBMS) which will be able to both service remote connections and give you a more expanded set of the SQL language.
Ultimately though, the database server must be running at all times. You wouldn't be able to connect to the database if it's down, and you don't know the lifespan of the app (or when it's going to be accessed, etc).
i got the below information from SQLite home page
SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine.
Based on the above statement you don't any server. I hope this information is useful to you.
I'm working on a plugin for an emulator that is going to allow people to host a control panel through a website to view statistics, etc; Currently I have XAMPP installed which is running my SQL Server, and the HTTP Server is being handled through the Netty networking library in Java.
I'm curious as to if there is a way to host the SQL Server from within Java, similar to the HTTP Server. It'd also greatly simplify the process of installation for the plugin.
The other option was to use ObjectDB, but after looking into it, it seems like it requires Quercus and I don't want to go through that.
The term you're looking for is "embedded database".
There are a number of databases that you can use as an embedded database, and you can choose to use them as an in-memory database (which means the data is gone when your application stops) or make them save data to a file on disk, so that the data is still there when you stop and re-start the application.
Examples of databases that can be used in this way: H2 Database, HSQLDB, Apache Derby.
I have a Linux server which has a Database. I want to query the Database from my Android application.
All the tutorials I find tell me to use PHP for some reason.
Can't I just query like I would normally with a Java application? Which is, I connect to the Database then send my queries as Strings.
It seems I need something like this:
Why?
PHP is just a server-side programming language. You can use any language and any server. The main issue is
Can I Query MySQL Database Directly from Android without a Web Service?
Yes you can. Just open the port where your MySql database is set usually at 3306. You also need JDBC Driver to set up connection to it.
Should I Query MySQL Database Directly from Android without a Web Service?
Unless you want to make a Database Client app (like phpMyAdmin) where each user holds his own credentials then you should not. In such case everyone will be using their own credentials to access their own db. In your case, you'd be hardcoding your database credentials in the app for everyone to access.
Well, your database user is only allowed to connect from localhost not from the outer world. If you want to execute queries from outer world then you will have to allow access from all IPs i.e. You will have to create a user create user 'app'#'%' identified by password123 (In my opinion it will be a bad approach).
Moreover you can build REST Web Services either using PHP (Recommended) or JAVA to interact with the database without opening it to world wide.
I have my website(in php) running in Yahoo small business and Application(in java) in Rackspace.com.both server has got mysql database.
I want to query my application database(in rackspace) from my website(in Yahoo) and get the result set.
How to do it?
Please suggest me reference document to do it.
Is it a good idea to directly query a remote database ? means is there any performance issue will rise ?
It's always a bad idea to remotely access data that do not "belong" to your app. In this case, the PHP app should access a set of functions that are exposed on the Java side. This is to make sure that when you upgrade the Java side, you may change the schema of the database without affecting anyone interacting with it.
I recommend you look into Web Services -- there are many methods (eg look for RPC, REST, SOAP), and some might be a better fit for your needs than others.
If you open the database port, it should be easy but unsecure.
If you can access the database port in a secure manner (for example vpn tunnel), it would be easy and secure :)
My suggestion would be to implement the querys as SOAP Services in the Application and access them via PHP. Google should provide enough Results about SOAP in both languages.
AFAIK
if you would like to use the java function from php you should implement the web services in java in any of the web service types
You can access web services from php using the cURL calls