大约有 19,602 项符合查询结果（耗时：0.0414秒） [XML]
Looking for simple Java in-memory cache [closed]
...hing library. Caffeine is a high performance, near optimal caching library based on Java 8. Caffeine provides an in-memory cache using a Google Guava inspired API
– Slavus
Apr 16 at 6:19
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How do you create a Distinct query in HQL
... That's suboptimal: instead of discarding the repetitions at the database level, it will just pull the data from the database to the memory with repetitions and all, and then discard the repetitions afterwards; depending on how often the data repeats, that can increase the I/O operations quite...
Converting BigDecimal to Integer
...s the wrong answer.
Making it better
Let's use the following assumptions based on the other answers.
We are okay with losing precision and truncating the value because that's what intValueExact() and auto-boxing do
We want an exception thrown when the BigDecimal is larger than the Integer range ...
Extracting specific columns from a data frame
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This doesn't use dplyr. It uses base::subset, and is identical to Stephane Laurent's answer except that you use column numbers instead of column names.
– Gregor Thomas
Oct 12 '17 at 18:16
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Get DateTime.Now with milliseconds precision
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I was looking for a similar solution, base on what was suggested on this thread, I use the following
DateTime.Now.ToString("MM/dd/yyyy hh:mm:ss.fff")
, and it work like charm. Note: that .fff are the precision numbers that you wish to capture.
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Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
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Specifying the version might be helpful as the solution may be different based upon the version.
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How do I replace text inside a div element?
...e.js, not jQuery. In Prototype $ looks up an item by ID. It's not selector-based like jQuery is. api.prototypejs.org/dom/dollar
– ceejayoz
Oct 15 '12 at 2:11
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What is cardinality in MySQL?
... @Pacerier: Yes, although I think that people working on databases are already quite familiar with relational theory, set theory and mathematics. And they borrowed the term from set theory: en.m.wikipedia.org/wiki/Cardinality
– Alexander Torstling
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Using DISTINCT and COUNT together in a MySQL Query
... against answers that don't offer optimal performance when it comes to databases. It's critical to keep perfomance standards. I'd go with @alistair-hart 's answer.
– JDuarteDJ
Jan 20 '15 at 15:45
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What is a covariant return type?
...can change the return type as long as it can be assigned to return type of Base version of the method.
So this feature of returning derived types is called COVARIANT...
Can overridden methods differ in return type?
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