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How to check if a table contains an element in Lua?
...out that you can't actually use the 'element' as a key, because it's not a string for example, then add a checksum or tostring on it for example, and then use that as the key.
Why do you want to do this? If your tables are very large, the amount of time to iterate through every element will be sig...
A python class that acts like dict
...er) instead of simply delegating to the instance's __dict__ - which essentially means you're creating two dicts for every instance.
– Aaron Hall♦
Jan 8 '17 at 0:39
8
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How to remove all of the data in a table using Django
...
Inside a manager:
def delete_everything(self):
Reporter.objects.all().delete()
def drop_table(self):
cursor = connection.cursor()
table_name = self.model._meta.db_table
sql = "DROP TABLE %s;" % (table_name, )
cursor.execute(sql)
...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...
If during the evaluation of an expression, the result is not mathematically defined or not in the range of
representable values for its type, the behavior is undefined. [ Note: most existing implementations of C++
ignore integer overflows. Treatment of division by zero, forming a remainde...
Java - No enclosing instance of type Foo is accessible
...ce of Hello before creating an instance of Thing.
public static void main(String[] args)
{
Hello h = new Hello();
Thing thing1 = h.new Thing(); // hope this syntax is right, typing on the fly :P
}
The last solution (a non-static nested class) would be mandatory if any instance of Thing d...
Examples of GoF Design Patterns in Java's core libraries
...ognizeable by creational methods returning the instance itself)
java.lang.StringBuilder#append() (unsynchronized)
java.lang.StringBuffer#append() (synchronized)
java.nio.ByteBuffer#put() (also on CharBuffer, ShortBuffer, IntBuffer, LongBuffer, FloatBuffer and DoubleBuffer)
javax.swing.GroupLayout.G...
Reading an image file into bitmap from sdcard, why am I getting a NullPointerException?
...ote the following code to convert an image from sdcard to a Base64 encoded string to send as a JSON object.And it works great:
String filepath = "/sdcard/temp.png";
File imagefile = new File(filepath);
FileInputStream fis = null;
try {
fis = new FileInputStream(imagefile);
} catch (FileNotF...
Get list of a class' instance methods
... Note that under Ruby 1.9+ the array of method names are symbols, not strings.
– Phrogz
Jun 24 '11 at 14:08
1
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Adding minutes to date time in PHP
...= $time->format('Y-m-d H:i');
The ISO 8601 standard for duration is a string in the form of P{y}Y{m1}M{d}DT{h}H{m2}M{s}S where the {*} parts are replaced by a number value indicating how long the duration is.
For example, P1Y2DT5S means 1 year, 2 days, and 5 seconds.
In the example above, we ...
Why can't I have “public static const string S = ”stuff"; in my Class?
When trying to compile my class I get an error:
6 Answers
6
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