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How do I quickly rename a MySQL database (change schema name)?
...u username -ppassword -sNe "rename table old_db.$table to new_db.$table"; done
OR
for table in `mysql -u root -ppassword -s -N -e "use old_db;show tables from old_db;"`; do mysql -u root -ppassword -s -N -e "use old_db;rename table old_db.$table to new_db.$table;"; done;
Notes:
There is no ...
mongodb: insert if not exists
...le:
now = datetime.utcnow()
for document in update:
collection.update_one(
{"_id": document["_id"]},
{
"$setOnInsert": {"insertion_date": now},
"$set": {"last_update_date": now},
},
upsert=True,
)
...
How to center icon and text in a android button with width set to “fill parent”
...hat are compatible with strings in Android. If you can find an acceptable one, this is a simple solution, and it has the added bonus that it will scale with text size. For instance, it has an envelope for an email icon and a couple of different phones for a call button.
– GLee...
Return string without trailing slash
...re str ends with a / slash. You should have two assertions (or two tests), one with a slash and one without.
– Seth Holladay
Jul 14 at 21:43
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|...
Is there a CSS selector by class prefix?
I want to apply a CSS rule to any element whose one of the classes matches specified prefix.
4 Answers
...
Optional Methods in Java Interface
...contain the remove operation.
Now can you do away with UnsupportedOperationException? Unfortunately
not.
Consider arrays. They implement most of the List operations, but not
remove and add. They are "fixed-size" Lists. If you want to capture
this notion in the hierarchy, you have to add...
Logical XOR operator in C++?
...t is the first time I encountered a practical need for it, but I don't see one listed in Stroustrup . I intend to write:
1...
How do I compute derivative using Numpy?
...ivatives by hand.
Finite differences require no external tools but are prone to numerical error and, if you're in a multivariate situation, can take a while.
Symbolic differentiation is ideal if your problem is simple enough. Symbolic methods are getting quite robust these days. SymPy is an exce...
How to programmatically set maxLength in Android TextView?
...rs = filters.plus(InputFilter.LengthFilter(max)) Don't overwrite existing ones
– ersin-ertan
Oct 30 '18 at 4:20
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...
Java Reflection: How to get the name of a variable?
...date" section below.
Complete information is often stored in class files. One compile-time optimization is to remove it, saving space (and providing some obsfuscation). However, when it is is present, each method has a local variable table attribute that lists the type and name of local variables, ...