How can trace Browser URLs and block to open it. if it is exist in my database.

Do not do it on the client machine.

The generally accepted way of doing his is to set up a proxy server on the network.

Configure all clients to use the proxy server, so their http requests are sent to the proxy server.

Then, on the proxy server, you can set rules for what is allowed and what isn't.

If the proxy allows it, it will forward the request to the internet, and when it receives a response, forward that to the client.

Obviously, you need to lock down the clients, so that the proxy settings cannot be changed.

Their are loads of hardware based filtering devices in the market too.

Remember, that client machines are not to be trusted. Putting the filtering logic in at a network level is much more secure.

There is an open source system called SQUID that does this, if you want to look at the code for how it works. Beware, though, that this is large and complex software.