大约有 35,477 项符合查询结果（耗时：0.0422秒） [XML]
What is the HTML tag “div” short for?
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answered Aug 29 '09 at 1:26
RushyoRushyo
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Git: how to reverse-merge a commit?
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106
To create a new commit that 'undoes' the changes of a past commit, use:
$ git revert <commi...
Is XML case-sensitive?
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answered Sep 14 '11 at 10:27
Jon EgertonJon Egerton
35k1010 gold badges8686 silver badges123123 bronze badges
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Difference between a Factory, Provider and a Service?
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edited Dec 4 '09 at 21:16
answered Dec 4 '09 at 21:06
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Creating functions in a loop
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edited Mar 10 '19 at 19:30
Aran-Fey
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How to move columns in a MySQL table?
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If empName is a VARCHAR(50) column:
ALTER TABLE Employees MODIFY COLUMN empName VARCHAR(50) AFTER department;
EDIT
Per the comments, you can also do this:
ALTER TABLE Employees CHANGE COLUMN empName empName VARCHAR(50) AFTER department;
Note t...
How do I wrap link_to around some html ruby code?
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edited Apr 20 '15 at 9:43
Arslan Ali
15.7k77 gold badges4545 silver badges6363 bronze badges
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MySQL: Set user variable from result of query
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| 123456 | 5 |
| 111111 | 5 |
+--------+-------+
2 rows in set (0.00 sec)
Note that for SET, either = or := can be used as the assignment operator. However inside other statements, the assignment operator must be := and not = because = is treated as a comparison operator in non-SET stat...
Setting a timeout for socket operations
...et = new Socket();
socket.connect(new InetSocketAddress(ipAddress, port), 1000);
Quoting from the documentation
connect
public void connect(SocketAddress endpoint, int timeout) throws IOException
Connects this socket to the server with a specified timeout value. A timeout of zero is i...
How do I test if a variable is a number in Bash?
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One approach is to use a regular expression, like so:
re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
echo "error: Not a number" >&2; exit 1
fi
If the value is not necessarily an integer, consider amending the regex appropriately; for instance:
^[0-9]+([.][0-9]+)?$
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