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Postgres: INSERT if does not exist already
...amples. (1) INSERT if not exists else NOTHING - INSERT INTO distributors (did, dname) VALUES (7, 'Redline GmbH') ON CONFLICT (did) DO NOTHING; (2) INSERT if not exists else UPDATE - INSERT INTO distributors (did, dname) VALUES (5, 'Gizmo Transglobal'), (6, 'Associated Computing, Inc') ON CON...
Where can I find the IIS logs?
... local IIS. I've created a website exactly as explained in their install guide, but am having some problems, and would like to see what the IIS log has to say. Embarrassingly enough, the problem is I can't find the log files!
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How to make input type= file Should accept only pdf and xls
...nspector. So in either case you need to check the file type on the server side (your second question).
Example:
<input type="file" name="upload" accept="application/pdf,application/vnd.ms-excel" />
To your third question "And when I click the files (PDF/XLS) on webpage it automatically sho...
What's the difference between belongs_to and has_one?
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They essentially do the same thing, the only difference is what side of the relationship you are on. If a User has a Profile, then in the User class you'd have has_one :profile and in the Profile class you'd have belongs_to :user. To determine who "has" the other object, look at where the ...
Why use the INCLUDE clause when creating an index?
...rting etc as I mentioned above. However, it may be useful if you have a residual lookup in a few rows from the key column(s)
Another MSDN article with a worked example
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Correct way of using JQuery-Mobile/Phonegap together?
...order of declaring script matters. First include jquery, THEN THIS CODE inside a script element, then jquery mobile js.
– Manish
May 18 '13 at 20:00
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Vsphere 6 集群上 安装 oracle rac 遇到的共享磁盘故障 - 数据库(内核) - ...
....com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2126079
主要有两个方面的改变
第一 改变磁盘的模式为独立—永久模式
第二 开启多写入模式
打开虚拟机的SSH SHELL模式，使用客户端登录主机。使用vi 命令编辑 ...
Where can I get Google developer key
... Oh man I was asking for developer key :( not api key,secret key,client_id... I already found these keys ,But I was not able to find developer key. Once I found developer key that is in youtube developer console only!!
– Neelesh
Jan 20 '12 at 9:33
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Appending to an existing string
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You can use << to append to a string in-place.
s = "foo"
old_id = s.object_id
s << "bar"
s #=> "foobar"
s.object_id == old_id #=> true
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Inserting HTML elements with JavaScript
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Using document fragments is very quick; faster than creating elements outside of the DOM and in certain situations faster than innerHTML.
Even though innerHTML is used within the function, it's all happening outside of the DOM so it's much faster than you'd think...
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