I\'ve got the following setup: class Vote < A开发者_StackOverflow中文版ctiveRecord::Base belongs_to :voteable, :polymorphic => :true, :counter_cache => true
Is it possibile to have a开发者_Go百科 mysql UNIQUE index on a varchar field not based on the words order?
Let\'s say I have following XML开发者_如何学C file: <authors> <author>a1</author>
I have a messages table that is structured somewhat like this: from|to|date -----------------------------------
What I know is that I want to create an app running on a linux system, that will gather system\'s information such as mac address, hd&cpu id\'s, OS version and computer\'s name, as well as a times
I am having an issue working with Hibernate and enforcing unique data members when inserting. Here are my abridged Entity objects:
I really can\'t find a simple or even any solution via sql to get unique data from DB (mySQL). I will give a sample (simplified):
For example... if I had a file like this: A16chr1136595888 A0chr1155517200 B16chr143227072 C0chr2055648508
I have an object like this: object[\"key1\"] = \"text1\" object[\"key2\"] = \"text2\" object[\"key3\"] = \"text1\"
In my java app I need to generate a unique order number for a customer\'s order.I thought the time of creation of order is a good enough unique value.Two orders cannot be created at the same second.
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