creation

after reading the H2 documentation , I wrote this simple application to create a H2 database in a local directory: public static void main(String[] args) throws SQLException { String path = "C:/Temp/H2/"; File fpath = new File(path); fpath.mkdirs(); FileUtils.recursiveDelete(fpath); String dbName = "tata"; String connection = "jdbc:h2:file:" + path + dbName; Server server = Server.createTcpServer(connection); server.start(); server.stop(); } This program runs fine, but when I check in the target directory, the database is not there... (i am using release 1.3.161) You need to actually access

Is there any way to set the default value for a column as an expire date (some hours from CURRENT_TIMESTAMP )? I have already tried: ALTER TABLE `table` ADD COLUMN `expire` TIMESTAMP NOT NULL DEFAULT TIMESTAMPADD(HOUR, 5, CURRENT_TIMESTAMP); But didn't work.. You can't implement a complex default value like that in the table definition. You can do it with a trigger if you want: DELIMITER $$ DROP TRIGGER IF EXISTS tr_b_ins_table $$ CREATE TRIGGER tr_b_ins_table BEFORE INSERT ON table FOR EACH ROW BEGIN SET NEW.expire = NOW() + INTERVAL 5 HOUR; END $$ DELIMITER ; 来源： https://stackoverflow.com

Scenario: When I photograph an object, I take multiple images, from several angles. Multiplied by the number of objects I "shoot", I can generate a large number of images. Problem: Camera generates images identified as, 'DSCN100001', 'DSCN100002", etc. Cryptic. I put together a script that will prompt for directory specification (Windows), as well as a "Prefix". The script reads the file's creation date and time, and rename the file accordingly. The prefix will be added to the front of the file name. So, 'DSCN100002.jpg' can become "FatMonkey 20110721 17:51:02". The time detail is important to

I come from a c++ background and I find myself constantly doing this in java: SomeClass sc=new SomeClass(); if(null!=sc) { sc.doSomething(); } What I want to know is what will be in the variable sc if the constructor fails for some reason (like maybe not enough memory). I can' t find a straight answer, and I am worried that I am just wasting my time because maybe if the new operator fails would the program just crash anyway? polygenelubricants The Java Specification Language 3rd Edition covers your question thoroughly: 12.5 Creation of New Class Instances Whenever a new class instance is

I have created a plugin to convert an HTML select box into a custom drop down using DIV's. All works well, but i'd like to make it a little better. see my jsFiddle At the end of the plugin I have 2 methods, slideDownOptions & slideUpOptions, I would like to make these available outside of the plugin so other events can trigger the action. Im getting a little confused how to do this and more specifically how to call the methods from both within the plugin AND from outside of the plugin. Any help always appreciated Think about refactoring your plugin using object oriented code. With this you can

I've been doing some reading on file formats and I'm very interested in them. I'm wondering what the process is to create a format. For example, a .jpeg, or .gif, or an audio format. What programming language would you use (if you use a programming language at all)? The site warned me that this question might be closed, but that's just a risk I'll take in the pursuit of knowledge. :) You do not need a programming language to write the specification for a file format, although a word processor might prove to be a handy tool. Basically, you need to decide how the information of the file is to be