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Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
...egers, you count starting from 0 and you end at 255. But with places in a string, you count starting from the 1st place, so doesn't it make sense to end at the 256th place, because you started at 1 instead of 0? I'm not agreeing with varchar(256) entirely just yet, because of string_length() resul...
error C2512: “Foo”: 没有合适的默认构造函数可用 - C/C++ - 清泛网 - 专...
...
Foo(int i):ival(i){}
private:
int ival;
};
int main(int argc, char *argv[])
{
vector<Foo> empty;
vector<Foo> bad(10);
vector<Foo> ok(10,1);
return 0;
}
解决办法： 实际上根据c++ primer第四版解释构造空的vector时是不调用对象的构造函数...
What is the most efficient/elegant way to parse a flat table into a tree?
... sets (sometimes referred to as Modified Pre-order Tree Traversal) you can extract the entire tree structure or any subtree within it in tree order with a single query, at the cost of inserts being more expensive, as you need to manage columns which describe an in-order path through thee tree struct...
Underlining text in UIButton
...lso override the setTitle method like so : objective-c - (void)setTitle:(NSString *)title forState:(UIControlState)state { [super setTitle:title forState:state]; [self setNeedsDisplay]; }
– Kirualex
Oct 14 '13 at 15:41
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Finding all objects that have a given property inside a collection [duplicate]
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Please note that when comparing strings, you must use the .equals method, otherwise you are comparing memory reference locations, refer to: stackoverflow.com/questions/767372/java-string-equals-versus
– user785262
Jun ...
Check if two unordered lists are equal [duplicate]
...se'
The difference is, the later will print True, if list2 contains some extra elements along with all the elements of list1. In simple words, it will ensure that all the elements of list1 should be present in list2, regardless of whether list2 has some extra elements or not.
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How can I pad a value with leading zeros?
...n't use this solution!
Potentially outdated: ECMAScript 2017 includes String.prototype.padStart and Number.prototype.toLocaleString is there since ECMAScript 3.1. Example:
var n=-0.1;
n.toLocaleString('en', {minimumIntegerDigits:4,minimumFractionDigits:2,useGrouping:false})
...will outpu...
Which @NotNull Java annotation should I use?
...get({FIELD, METHOD, PARAMETER, LOCAL_VARIABLE})
public @interface NotNull {String value() default "";}
package javax.annotation;
@TypeQualifier
@Retention(RUNTIME)
public @interface Nonnull {
When when() default When.ALWAYS;
static class Checker implements TypeQualifierValidator<Nonnu...
Pretty printing JSON from Jackson 2.2's ObjectMapper
... of org.fasterxml.jackson.databind.ObjectMapper and would like to get a String with pretty JSON. All of the results of my Google searches have come up with Jackson 1.x ways of doing this and I can't seem to find the proper, non-deprecated way of doing this with 2.2. Even though I don't believe t...
Use logging print the output of pprint
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Use pprint.pformat to get a string, and then send it to your logging framework.
from pprint import pformat
ds = [{'hello': 'there'}]
logging.debug(pformat(ds))
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