What is the best way to sort?

Hi I have 1,000 customers in the database. I need to display in the drop-down list box. COMBOX is editable. The user types the letters, I need to filter and display the names of customers. for example if the user types 'a' in the combox I display all customer names beginning with "a". If the client type 'under' then I have to show only names that begin with "what," in the drop-down list box popup. for every key stroke, I filter and display the names of the clients.

for this, there are two approaches: -.
1. for each key stroke, go to the database and retrieve the sorted results and display. This way sort takes place in the database.
2. pull once all clients in java, cash and therefore sort them based on key strokes. In this sorting is done in our java code.

friends said that it is expensive to go to the database for every key stroke. I feel pulling all clients at once and their collection in java isn't a good idea.

I'm really confused. I need a suggestion expertise. where is the best? Why is this the best way? What are the advantages and disadvantages of the two ways. Please help me.
Thanks in advance.

Thanks ejp but initially if the combo box is not empty. This means that if he did not type any letter I show all the names.

N ° this is the error. Don't, don't. A ComboBox with 1000 or 5000 elements is completely useless. Do as I said.

My problem is that if there are 5000 customers then what? It will not create a performance problem.

Of course, it will be. It will also create a problem of great performance for the user.

However, you seem to have missed something else. Using the combobox with anything, you're already running a cache. Not two ways on this subject and no way to avoid it. So all you fill with, and each time you do, all you have to do when the user types a different combination of keys is filter the model combobox to exclude everything that does not prefix that he hit. To return to the database is not yet arise.

Tags: Java

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