大约有 3,551 项符合查询结果（耗时：0.0358秒） [XML]
How to build Qt for Visual Studio 2010
...
This is great, but I would add -qt-sql-sqlite to the configure flags if you don't want to have problems with your custom-built Qt Assistant. Seems like it needs this plugin to read the documentation databases successfully.
– neuviemeporte...
How do I join two SQLite tables in my Android application?
...valueOf(propertyId)});
Use ? bindings instead of putting values into raw sql query.
share
|
improve this answer
|
follow
|
...
Count, size, length…too many choices in Ruby?
... work.
post.comments.count - Determine the number of elements with an SQL
COUNT query. You can also specify conditions to count only a subset of
the associated elements (e.g. :conditions => {:author_name =>
"josh"}). If you set up a counter cache on the association, #count
will re...
What's the difference between @JoinColumn and mappedBy when using a JPA @OneToMany association
...in physical information duplication (column name) along with not optimized SQL query that will produce some additional UPDATE statements.
According to documentation:
Since many to one are (almost) always the owner side of a bidirectional relationship in the JPA spec, the one to many association is...
What is the best way to implement nested dictionaries?
... @jason Depending on the data, I like to use JSON, csv files, or even a sqlite database to store it.
– nosklo
Feb 12 '19 at 6:37
...
2015年硅谷最火的高科技创业公司都有哪些 - 资讯 - 清泛网 - 专注C/C++及内核技术
...作为Hadoop的三剑客，一些运维领域，mangodb，couchbase都是nosql的代表，作为服务领域AWS和Google BigQuery剑拔弩张，在传统数据库，Oracle收购了MySQL，DB2老牌银行专用，Teradata做了多年数据仓库。上面的Apps更多， 比如社交消费领域Google...
Why JSF saves the state of UI components on server?
...mory in flavor of a session scoped bean where Java is been used instead of SQL to filter/group/arrange the records. With ~1000 records, that would easily go over 10MB per user session.
share
|
impro...
Do try/catch blocks hurt performance when exceptions are not thrown?
...c language features to behave correctly, and optimize what we can control (sql, indexes, algorithms).
– Kobi
Aug 22 '09 at 16:13
5
...
How does the Amazon Recommendation feature work?
...ed out in commerce server) have moved on to live directly within Microsoft SQL.
The four big take-a-ways you should have are:
Amazon (or any retailer) is looking at aggregate data for tons of transactions and tons of people... this allows them to even recommend pretty well for anonymous users o...
MySQL vs MongoDB 1000 reads
...t MongoDb and have been testing it lately. I had a table called posts in MySQL with about 20 million records indexed only on a field called 'id'.
...