MySQLTunnel written in PHP

Very Nice I love Delphi.

Hi again,
Have you any Delphi code using tunnel.
Using zeos components I tend to loose connection, but thought this might be an easy way to communicate with MySQL.
This would help me with a web hosting service that limits the use of MySQL to specific IP addresses.
Sorry this is not b4a related but will be very handy for this entire project.

Tom

Interesting approach. I have been playing round with a Restful API written in PHP using PDO and the Slim frame work. I suspect your tunnel will give faster performance but a Restful API will run on any server that supports PHP and because it uses PDO it's simple to support multiple database and web server platforms. My test server is running IIS and Postgres and the authors production sevrver is running Apache and MySQL.

It's a bit of conundrum. Go for something which has faster performance but is limited in platform or go for slower performance but with an open architecture that means you can fit in with the clients existing platforms.

TomDuncan said:

Hi again,
Have you any Delphi code using tunnel.
Using zeos components I tend to loose connection, but thought this might be an easy way to communicate with MySQL.
This would help me with a web hosting service that limits the use of MySQL to specific IP addresses.
Sorry this is not b4a related but will be very handy for this entire project.

Tom

Click to expand...

Tom,

I've been using UniDAC in Delphi for CLOUD MySQL for more than 2,5 years now. The disconnections issue is in fact an issue related not only to MySQL but routers and network inbetween. I use an exception handler in my UniConnection components to reconnect to the DB without affecting the user or the interface whenever the connection is dropped. One other issue I've used is pinging the service (MySQL) either issuing a "SELECT version()" or MySQL.ping to keep the connection alive from the server's point, since MySQL has a connection timeout.

I've tried a lot my tunnel as well as UniDAC's tunnel with Delphi and the performance overhead is huge. In fact our products realize direct-encrypted connections to our cloud servers (in Rackspace) and the performance is acceptable, since we've overcome with the disconnections issues.
Nowadays we are dealing with CopyCAT, a VCL to synch databases based on triggers. Quick performance, reliable and stable. We haven't put that in productions since there are issues we have to deal with the embedded databases we use, but the product seems to be very promising.

The tunnel is needed in cases such as mobile devices, etc. Just as B4A is targeted.

keirS said:

Interesting approach. I have been playing round with a Restful API written in PHP using PDO and the Slim frame work. I suspect your tunnel will give faster performance but a Restful API will run on any server that supports PHP and because it uses PDO it's simple to support multiple database and web server platforms. My test server is running IIS and Postgres and the authors production sevrver is running Apache and MySQL.

It's a bit of conundrum. Go for something which has faster performance but is limited in platform or go for slower performance but with an open architecture that means you can fit in with the clients existing platforms.

Click to expand...

keirS,

thanks. In fact the tunnel is written to run on any PHP server, and by changing the DB relevant commands, which now are MySQL based, you can have a tunnel for other databases, such as Postgres, Oracle, SQLite, etc. Of course without PDO you will not have a database agnostic tunnel, but the performance, as you've realized too, is faster that anything else. On the other hand we need performance on the server since the whole tunneling process is network intensive and the mobile client needs to wait all the time from issuing the command to get the relevant answer back.

To tell the truth the whole tunneling idea was first based on Delphi, that's the reason most of the implementation remind Delphi's dataset class.

Regards,

Have any of the original Delphi code available in the public domain.
It might be slower than using unidac or zeos but it would be easier, don't you think.
Tom

Tom,

sorry I don't think I have the Delphi code available any more. It was outdated, written more than 2 years ago. And since we've changed to Delphi XE, I've just dropped the Delphi relevant code. But If you want you can check the relevant B4A source and rewrite to Delphi. I know it will take some time but this is what I've done initially to write the B4A code from Delphi's datasource.

Again sorry.

Will have a look.
I still use Delphi 7.
I want to use it as a method of exporting fom sqlite then to my MySQL database the either to windows or B4a.
I cannot quarantee that the client will have internet access.

If you could find any code tat would be great.
I do need data aware since i will b doing SQL calls to update my sqlite database.

Tom

Note that you can use B4J for that. It supports both MySQL and SQLite.

Oh, thanks for that.
I will have a look.

Tom