大约有 30,000 项符合查询结果（耗时：0.0508秒） [XML]
WITH CHECK ADD CONSTRAINT followed by CHECK CONSTRAINT vs. ADD CONSTRAINT
...ts. If you disable a constraint with ALTER TABLE foo NOCHECK CONSTRAINT fk_b and then re-enable it with ALTER TABLE foo CHECK CONSTRAINT fk_b it doesn't verify the constraint. ALTER TABLE foo WITH CHECK CHECK CONSTRAINT fk_b is necessary in order to have the data verified.
– ...
How to properly seed random number generator
...roduce a given sequence (which is usually only done for debugging and unit testing).
After that you simply call Intn to get the next random integer.
Move the rand.Seed(time.Now().UTC().UnixNano()) line from the randInt function to the start of the main and everything will be faster.
Note also tha...
Read environment variables in Node.js
...
process.env.ENV_VARIABLE
Where ENV_VARIABLE is the name of the variable you wish to access.
See Node.js docs for process.env.
share
|
i...
Get button click inside UITableViewCell
...kOnCellAtIndex:withData:)]) {
[self.delegate didClickOnCellAtIndex:_cellIndex withData:@"any other cell data/property"];
}
}
In table view controller cellForRowAtIndexPath after dequeing the cell, set the above properties.
cell.delegate = self;
cell.cellIndex = indexPath.row; // Set i...
In Firebase, is there a way to get the number of children of a node without loading all the node dat
...nt of unique votes and counts which keeps coming up!. But this time I have tested my suggestion! (notwithstanding cut/paste errors!).
The 'trick' here is to use the node priority to as the vote count...
The data is:
vote/$issueBeingVotedOn/user/$uniqueIdOfVoter = thisVotesCount, priority=thisVote...
Programmatically find the number of cores on a machine
...<thread>
//may return 0 when not able to detect
const auto processor_count = std::thread::hardware_concurrency();
Reference: std::thread::hardware_concurrency
In C++ prior to C++11, there's no portable way. Instead, you'll need to use one or more of the following methods (guarded by app...
Arduino Sketch upload issue - avrdude: stk500_recv(): programmer is not responding
... (with corresponding RX flashes on the board) right before the avrdude: ser_recv(): programmer is not responding error.
The trick is to hit the reset button on the board immediately before these three packets are sent. Then the program will be uploaded successfully.
...
How to update a record using sequelize for node?
...
Project.update(
{ title: 'a very different title now' },
{ where: { _id: 1 } }
)
.success(result =>
handleResult(result)
)
.error(err =>
handleError(err)
)
Update 2016-03-09
The latest version actually doesn't use success and error anymore but instead uses then-able...
SVN encrypted password store
...e subversion password is linked to other important accounts, someone might test the encryption strength to crack the password out.
The best bet is to setup the subversion client to turn off stored passwords and force lazy Dev's to authenticate each time.
...
Django queries - id vs pk
...you don't need to care whether the primary key field is called id or object_id or whatever.
It also provides more consistency if you have models with different primary key fields.
share
|
improve t...