大约有 9,000 项符合查询结果（耗时：0.0279秒） [XML]
Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
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@CharlesBretana: By "fake UTF-8" I mean MySQL's "utf8" encoding, which as I mentioned reserves (and is limited to) 3 bytes per character. This isn't a very good version of UTF-8; if you want decent UTF-8 in MySQL, you have to use its "utf8mb4" encoding. But people ...
How to add column if not exists on PostgreSQL?
...executed as queries), it would be a recipe for disaster as it opens you to SQL injection attacks.
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mongoose vs mongodb (nodejs modules/extensions), which better? and why?
...you're looking for an object modeling (ODM, a counterpart to ORMs from the SQL world) tool to skip some lower level work, you want Mongoose.
If you want a driver, because you intend to break a lot of rules that an ODM might enforce, go with MongoDB. If you want a fast driver, and can live with some...
Expansion of variables inside single quotes in a command in Bash
...by concatenating variables. This is a bad idea similar to concatenation of SQL fragments (SQL injection!).
Usually it is possible to have placeholders in the command, and to supply the command together with variables so that the callee can receive them from the invocation arguments list.
For examp...
SHA1 vs md5 vs SHA256: which to use for a PHP login?
... you've made it. Again this could be a disgruntled employee XSS attack or sql injection or some other attack that has nothing to do with your password encryption.
I do believe you should still encrypt but the only thing I can see the encryption does is prevent people that already have or somehow ...
Which MySQL data type to use for storing boolean values
Since MySQL doesn't seem to have any 'boolean' data type, which data type do you 'abuse' for storing true/false information in MySQL?
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30条爆笑的程序员梗 PHP是最好的语言 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...公路下山时坏在半路上了。于是两位工程师和一位经理就如何修车的问题 展开了讨论。
硬件工程师说：“我可以用随身携带的瑞士军刀把车坏的部分拆下来，找出原因，排除故障。”
项目经理说：“根据经营管理学，应该召...
NOT using repository pattern, use the ORM as is (EF)
...stead of constrained to a consistent location creates the EF equivalent of SQL calls in codebehind pages. Every LINQ query is a potential maintenance point in an application, and the more there are (and the more widespread they are), the higher the maintenance costs and risks. Imagine adding a 'de...
Fastest way to count exact number of rows in a very large table?
...r independent solution = use the standard = COUNT(*)
There are approximate SQL Server solutions but don't use COUNT(*) = out of scope
Notes:
COUNT(1) = COUNT(*) = COUNT(PrimaryKey) just in case
Edit:
SQL Server example (1.4 billion rows, 12 columns)
SELECT COUNT(*) FROM MyBigtable WITH (NOLOCK...
Do you use source control for your database items? [closed]
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With Mysql Workbench you can have all that in a structured file(xml) that can be opened and handled with a GUI. Being xml just text, yes it can be versioning without having to type single sql sentence.
– levhi...