大约有 40,000 项符合查询结果（耗时：0.0508秒） [XML]
add column to mysql table if it does not exist
...
OK this is really crude but someone's got to say it. if you are simply running a SQL script from the command line, you can give mysql the --force switch, which means keep going even if there's an error. then, just go for it. you just want...
Border around tr element doesn't show?
...llapse: collapse;
}
JSFiddle.
The reason why it behaves this way is actually described pretty well in the specification:
There are two distinct models for setting borders on table cells in
CSS. One is most suitable for so-called separated borders around
individual cells, the other is suit...
Use of *args and **kwargs [duplicate]
...u're not sure how many arguments might be passed to your function, i.e. it allows you pass an arbitrary number of arguments to your function. For example:
>>> def print_everything(*args):
for count, thing in enumerate(args):
... print( '{0}. {1}'.format(count, thing))
...
...
How to set selected value of jquery select2?
...
To dynamically set the "selected" value of a Select2 component:
$('#inputID').select2('data', {id: 100, a_key: 'Lorem Ipsum'});
Where the second parameter is an object with expected values.
UPDATE:
This does work, just wanted to n...
AngularJS : Where to use promises?
...Let's set aside AngularJS for a moment and just consider the Facebook API calls. Both the API calls use a callback mechanism to notify the caller when the response from Facebook is available:
facebook.FB.api('/' + item, function (result) {
if (result.error) {
// handle error
} else...
How can foreign key constraints be temporarily disabled using T-SQL?
...
If you want to disable all constraints in the database just run this code:
-- disable all constraints
EXEC sp_MSforeachtable "ALTER TABLE ? NOCHECK CONSTRAINT all"
To switch them back on, run: (the print is optional of course and it is just list...
java get file size efficiently
...97.044
URL sum: 95534, per Iteration: 382.136
File must be caching the calls to the filesystem, while channels and URL have some overhead.
Code:
import java.io.*;
import java.net.*;
import java.util.*;
public enum FileSizeBench {
LENGTH {
@Override
public long getResult() ...
What is the proper way to re-attach detached objects in Hibernate?
...e to the DB,
and overwrite any intervening updates.
refresh() cannot be called on a detached entity.
lock() cannot be called on a detached entity,
and even if it could, and it did reattach the entity,
calling 'lock' with argument 'LockMode.NONE'
implying that you are locking, but not locking,
i...
How to avoid .pyc files?
... I just tried this and, it does work for imported modules. Specifically, once this variable is set anything imported later won't generate pyc files. This is delightful. Thanks.
– user234736
Nov 22 '12 at 19:59
...
Capitalize the first letter of both words in a two word string
...ting the tolower function inside thee simpleCap function you can deal with all capped words too:is code you can deal: <br/> name <- c("george wasHINgton","tom jefferson", "ABE LINCOLN") simpleCap <- function(x) { s <- tolower(x) s <- strsplit(s, " ")[[1]] paste(toupp...