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Foreign Key naming scheme
...cause when you have a huge db with a lot of keys and tables and you get an error during a schema update in your software it's pretty hard to find where the foreign key is even defined without doing a search of a database create script.
– JohnC
Apr 11 '12 at 0:0...
AWK: Access captured group from line pattern
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Apparently someone disagrees. This web page is from 2005 : tek-tips.com/faqs.cfm?fid=5674 It confirms that you cannot reuse matched groups in awk.
– Peter Tillemans
Jun 2 '10 at 13:00
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How can I check if a Perl array contains a particular value?
...w to Perl 5.10. Took some time before I figured out why I'm getting syntax errors.
– Igor Skochinsky
Jun 11 '14 at 16:12
17
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Callback functions in Java
...hat simple
public interface myCallback {
void onSuccess();
void onError(String err);
}
now to make this callback run when ever you wish to do to handle the results - more likely after async call and you wanna run some stuff which depends on these reuslts
// import the Interface class her...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
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Exit code is
0 when execution went fine;
1, -1, whatever != 0 when some error occurred, you can use different values for different kind of errors.
If I'm correct exit codes used to be just positive numbers (I mean in UNIX) and according to range:
1-127 are user defined codes (so generated by ...
How can I delete all Git branches which have been merged?
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This produces an error fatal: branch name required if you have no branches that should be deleted. To avoid that you can pass -r to xargs so it won't run git branch -d if the stdin is empty. (This a GNU xargs extension, according to the man...
SQL NVARCHAR and VARCHAR Limits
All, I have a large (unavoidable) dynamic SQL query. Due to the number of fields in the selection criteria the string containing the dynamic SQL is growing over 4000 chars. Now, I understand that there is a 4000 max set for NVARCHAR(MAX) , but looking at the executed SQL in Server Profiler for the ...
数据结构与本地数据库 05：搜索、倒序与重复导入 · App Inventor 2 中文网
... 数据结构与本地数据库 05：搜索、倒序与重复导入 课程首页 · 全部知识课程 · 返回专题主页
这课解决什么
先预测，再运行
开始实战
新增或调整的组...
How do I write the 'cd' command in a makefile?
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@Beta: well yes, and a dash prefix ignores the error status as well. Maybe I got a little carried away, I wanted to point out the fact that make does echos the command, regardless of what kind of command it is. And in this case, it's a command with no output, which makes ...
Is there a (repeat-last-command) in Emacs?
...nd command.
– Drew
Jan 26 '14 at 23:05
You can also use C-x M-: as part of a keyboard macro, which can be handy. The ...