大约有 6,886 项符合查询结果（耗时：0.0222秒） [XML]
MySQL Conditional Insert
...s the insert instead of updating or inserting a row when you have a unique index on (user, item).
The query will look like this:
INSERT IGNORE INTO x_table(instance, user, item) VALUES (919191, 123, 456)
You can add the unique index with CREATE UNIQUE INDEX user_item ON x_table (user, item).
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Why does UITableViewCell remain highlighted?
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In your didSelectRowAtIndexPath you need to call deselectRowAtIndexPath to deselect the cell.
So whatever else you are doing in didSelectRowAtIndexPath you just have it call deselectRowAtIndexPath as well.
- (void)tableView:(UITableView *)tableV...
How can I move a single directory from a git repository to a new repository whilst maintaining the h
...wering @ilius's question too), you want something like git filter-branch --index-filter 'git rm -r --cached --ignore-unmatched foodir' -- --all
– Brian Campbell
Apr 24 '14 at 14:36
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Various ways to remove local Git changes
...ind using git reset --hard. I tried it out, and yes.. those files added to index(staging) were removed only after git reset --hard, and i assume by default git reset --hard is git reset --hard head. This link was also helpful gitready.com/beginner/2009/01/18/the-staging-area.html
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Why not be dependently typed?
... Natty (S n)
For any promotable type, we can build the singleton family, indexed
over the promoted type, inhabited by run-time duplicates of its
values. Natty n is the type of run-time copies of the type-level n
:: Nat. We can now write
vReplicate :: Natty n -> x -> Vec n x
vReplicate Zy ...
Can I get a list of files marked --assume-unchanged?
...a list of related aliases I have in ~/.gitconfig:
[alias]
hide = update-index --assume-unchanged
unhide = update-index --no-assume-unchanged
unhide-all = update-index --really-refresh
hidden = !git ls-files -v | grep \"^[a-z]\"
ignored = !git status -s --ignored | grep \"^!!\"
To make i...
Passing arguments to C# generic new() of templated type
...ay argument.
var constructorParameters = parameters.Select((paramType, index) =>
// convert the object[index] to the right constructor parameter type.
Expression.Convert(
// read a value from the object[index]
Expression.ArrayAccess(
par...
How to access random item in list?
...id accessing element max, which would be one beyond the presumably 0-based index?
– B. Clay Shannon
Feb 12 '16 at 2:02
22
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Sorting arrays in NumPy by column
...p.argsort may themselve take up quite a lot of memory, and on top of that, indexing with an array will also generate a copy of the array that is being sorted.
– ali_m
Jul 11 '15 at 23:38
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Getting indices of True values in a boolean list
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Use enumerate, list.index returns the index of first match found.
>>> t = [False, False, False, False, True, True, False, True, False, False, False, False, False, False, False, False]
>>> [i for i, x in enumerate(t) if x]
[4, ...