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nvarchar和varchar相互转换、联合查询 - ORACLE - 清泛IT论坛，有思想、有深度
...后由 zqp2013 于 2015-2-27 16:42 编辑
场景：联合查询（union all）Oracle两张表，同一组字段的数据类型不一致，分别是nvarchar和varchar。
这时联合查询报错如下：ora12704：字符集不匹配。
解决方法：需要对数据类型进行转换。
Specif...
Convert Data URI to File then append to FormData
...g around with a few things, I managed to figure this out myself.
First of all, this will convert a dataURI to a Blob:
function dataURItoBlob(dataURI) {
// convert base64/URLEncoded data component to raw binary data held in a string
var byteString;
if (dataURI.split(',')[0].indexOf('bas...
Can someone explain collection_select to me in clear, simple terms?
...order(..) or something like that.
# In your example it is:
Author.all,
# then you should specify methods for generating options
:id, # this is name of method that will be called for every row, result will be set as key
:name_with_initial, # this is name of method that will be ...
Run batch file as a Windows service
...
NSSM is totally free and hyper-easy, running command prompt / terminal as administrator:
nssm install "YourCoolServiceNameLabel"
then a dialog will appear so you can choose where is the file you want to run.
to uninstall
nssm remov...
jQuery.click() vs onClick
...{ is better as it follows standard event registration model. (jQuery internally uses addEventListener and attachEvent).
Basically registering an event in modern way is the unobtrusive way of handling events. Also to register more than one event listener for the target you can call addEventListener...
jQuery UI Tabs - How to Get Currently Selected Tab Index
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Looks like this actually gives the default tab, not the currently selected tab. What am I missing? 42 votes can't be wrong, can they? jqueryui.com/demos/tabs/#option-selected
– Patrick Szalapski
Dec 9 '1...
Android Facebook style slide
...ough the transparent View.
The code is here, and the bottom two buttons (called HorzScrollWithListMenu and HorzScrollWithImageMenu) in the Launch activity show the best menus I could come up with:
Android sliding menu demo
Screenshot from emulator (mid-scroll):
Screenshot from device (full-scr...
Need a simple explanation of the inject method
...otal and then stores the result back into the accumulator. The next block call has this new value, adds to it, stores it again, and repeats.
At the end of the process, inject returns the accumulator, which in this case is the sum of all the values in the array, or 10.
Here's another simple example...
Playing .mp3 and .wav in Java?
...
this isnt working for me at all. it says that the imports do not exist. and i am running java 7...
– PulsePanda
Nov 26 '12 at 3:09
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Why both no-cache and no-store should be used in HTTP response?
...ce is still valid then the cache can respond with its representation, thus alleviating the need for the server to resend the entire resource.
no-store is effectively the full do not cache directive and is intended to prevent storage of the representation in any form of cache whatsoever.
I say what...