大约有 47,000 项符合查询结果（耗时：0.0193秒） [XML]
Check if instance is of a type
... A small note: use "is" if you don't want to use the result of the cast and use "as" if you do.
– Aviram Fireberger
Nov 10 '15 at 14:55
15
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How to speed up insertion performance in PostgreSQL
...rypto module) is (a lot) faster than uuid_generate_v4()
=# explain analyze select uuid_generate_v4(),* from generate_series(1,10000);
QUERY PLAN
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Why does Oracle 9i treat an empty string as NULL?
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@sehe the confusing bit for me is select 1 from dual where ('' is null)
– matt freake
Aug 22 '13 at 15:58
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Change default primary key in Eloquent
...d to make sure you set public $incrementing = false otherwise laravel will cast the field to an Integer, giving 0
class User extends Model {
protected $primaryKey = 'my_string_key';
public $incrementing = false;
}
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Cannot set boolean values in LocalStorage?
...otally didn't realize that. I thought if one were a string, the other was cast to a string. Cheers (+1).
– Andy E
Jul 16 '10 at 9:01
2
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Databinding an enum property to a ComboBox in WPF
...numeration {x:Type my:Status}}}"
DisplayMemberPath="Description"
SelectedValue="{Binding CurrentStatus}"
SelectedValuePath="Value" />
And the implementation...
public class EnumerationExtension : MarkupExtension
{
private Type _enumType;
public EnumerationExtensio...
Gson: Directly convert String to JsonObject (no POJO)
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the cast to JsonObject is unnecessary, better use new JsonParser().parse(..).getAsJsonObject();
– Chriss
Jul 18 '14 at 11:46
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How to store arrays in MySQL?
... retrieve a person and all of their fruit you can do something like this:
SELECT p.*, f.*
FROM person p
INNER JOIN person_fruit pf
ON pf.person_id = p.id
INNER JOIN fruits f
ON f.fruit_name = pf.fruit_name
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How to convert float to int with Java
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why is the typecast needed after Math.round()?
– necromancer
Jun 9 '12 at 1:51
81
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Why does ('0' ? 'a' : 'b') behave different than ('0' == true ? 'a' : 'b') [duplicate]
... not equal to true, though it is not false.
In the first case, when '0' is casted to bool, casting operator returns true for everything that is not 0.
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