大约有 13,700 项符合查询结果（耗时：0.0299秒） [XML]
What should I name a table that maps two tables together? [closed]
...oducts and another category for recipe. for both tables we will have recipe_categories and product_categories, and since we can't just "categories" table name for both tables, in order to prevent the conflict, the junction tables for product and recipe will be "recipe_recipe_categories" and "product...
How to properly create composite primary keys - MYSQL
...is a gross oversimplification of an intense setup I am working with. table_1 and table_2 both have auto-increment surrogate primary keys as the ID. info is a table that contains information about both table_1 and table_2 .
...
What's the difference between eval, exec, and compile?
...n Python is whatever you can have as the value in a variable assignment:
a_variable = (anything you can put within these parentheses is an expression)
eval returns the value of the given expression, whereas exec ignores the return value from its code, and always returns None (in Python 2 it is a s...
Convert string to integer type in Go?
...64); err == nil {
fmt.Printf("i=%d, type: %T\n", i, i)
}
var i int
if _, err := fmt.Sscan(s, &i); err == nil {
fmt.Printf("i=%d, type: %T\n", i, i)
}
Output (if called with argument "123"):
i=123, type: int
i=123, type: int64
i=123, type: int
Parsing Custom strings
There is also a...
How do I check in JavaScript if a value exists at a certain array index?
...his answer: stackoverflow.com/a/39171620/3120446
– dx_over_dt
Jul 9 '19 at 20:19
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show 9 more comments
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How to convert an array to object in PHP?
...son Medina pointed out, a really clean solution is to use the built-in json_ functions:
$object = json_decode(json_encode($array), FALSE);
This also (recursively) converts all of your sub arrays into objects, which you may or may not want. Unfortunately it has a 2-3x performance hit over the loop...
Python nonlocal statement
...so that it looks more like the idioms of languages with closures.
def make_counter():
count = 0
def counter():
nonlocal count
count += 1
return count
return counter
Obviously, you could write this as a generator, like:
def counter_generator():
count = 0
...
Quora如何在快速开发中保持高品质代码 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...模块/目录等级的代码“ownership”上添加标签，例如：
__reviewer__ = 'vanessa, kornel'
如果提交新变更，系统就自动会分析文件（或其上层目录），将新审查者的名字添加到提交数据中。我们还有额外的规则将代码审核派发给合适的...
How do I get a file extension in PHP?
...t few people know it. Meet pathinfo():
$ext = pathinfo($filename, PATHINFO_EXTENSION);
This is fast and built-in. pathinfo() can give you other information, such as canonical path, depending on the constant you pass to it.
Remember that if you want to be able to deal with non ASCII characters, y...
How do I declare class-level properties in Objective-C?
...natomic' version? Also i would consider naming the backing variables with '_' as is default by apple and also improves readability since returning/setting self.value from the getter/setter causes infinite recursion. In my opinion this is the right answer.
– Peter Segerblom
...