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Design Pattern for Undo Engine
...n). You could restructure it so that you store a pointer to the (version => data) table and just pick the latest each time, but that tends to harm locality when you’re persisting data, muddies concerns a little, and makes it harder to do some sorts of common queries, so it’s not the way it wo...
Java NIO FileChannel versus FileOutputstream performance / usefulness
... been that java.nio is faster than java.io. Solidly faster. Like in the >250% range. That said, I am eliminating obvious bottlenecks, which I suggest your micro-benchmark might suffer from. Potential areas for investigating:
The buffer size. The algorithm you basically have is
copy from d...
Download large file in python with requests
... for attempt in range(1, attempts+1):
try:
if attempt > 1:
time.sleep(10) # 10 seconds wait time between downloads
with requests.get(url, stream=True) as response:
response.raise_for_status()
with open(file_path, 'wb...
How can I use 'Not Like' operator in MongoDB
... do with regex which does not contain a word. Also, you can use $options => i for case of insensitive search.
Doesn't Contain string
db.collection.find({name:{'$regex' : '^((?!string).)*$', '$options' : 'i'}})
Exact case insensitive string
db.collection.find({name:{'$regex' : '^string$', '$o...
MySQL - length() vs char_length()
What's the main difference between length() and char_length() ?
2 Answers
2
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Deprecated ManagedQuery() issue
...if (mCur != null && mCur.moveToFirst() && mCur.getCount() > 0) {
while (mCur.isAfterLast() == false) {
Log.e("hist_titleIdx",
mCur.getString(Browser.HISTORY_PROJECTION_TITLE_INDEX));
Log.e("hist_urlIdx",
...
C# equivalent to Java's charAt()?
... use LINQ
string abc = "abc";
char getresult = abc.Where((item, index) => index == 2).Single();
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Update or Insert (multiple rows and columns) from subquery in PostgreSQL
...able2 t2 INNER JOIN table3 t3 ON t2.id = t3.t2_id
WHERE t2.created_at > '2016-01-01'
) AS subquery
WHERE table1.id = subquery.col1;
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how to get first three characters of an NSString?
...
mystr=[mystr substringToIndex:3];
Be sure your string has atleast 3 ch.. o.e. it will crash the app.
Here are some other links to check NSsting operations...
Link1
Link2
Apple Link
...
How to preview git-pull without doing fetch?
... gives output like this (part of output):
...
72f8433..c8af041 develop -> origin/develop
...
This operation gives us two commit IDs, first is the old one, and second will be the new.
Then compare these two commits using git diff
git diff 72f8433..c8af041 | grep "diff --git"
This command...