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剖析程序的内存布局 - C/C++ - 清泛网 - 专注C/C++及内核技术
...拟地址空间的布局就讲这些吧。下一篇文章将讨论内核是如何跟踪这些内存区域的。我们会分析内存映射，看看文件的读写操作是如何与之关联的，以及内存使用概况的含义。
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What is the difference between Amazon S3 and Amazon EC2 instance?
I need to create a web application using php mysql and html. The no.of requests and data will be very high. I need Amazon server space.
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What data type to use for hashed password field and what length?
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You can actually use CHAR(length of hash) to define your datatype for MySQL because each hashing algorithm will always evaluate out to the same number of characters. For example, SHA1 always returns a 40-character hexadecimal number.
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Checking if a field contains a string
.../reference/sql-comparison/
http://php.net/manual/en/mongo.sqltomongo.php
MySQL
SELECT * FROM users WHERE username LIKE "%Son%"
MongoDB
db.users.find({username:/Son/})
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how to get last insert id after insert query in codeigniter active record
...n insert query (active record style) used to insert the form fields into a MySQL table. I want to get the last auto-incremented id for the insert operation as the return value of my query but I have some problems with it.
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京东618：算法让UV价值提升200%+，用智能卖场缩短购物路径 - 更多技术 - 清...
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CSDN：如果模型预测的结果为无货商品或下架商品，你们如何处理？
智能卖场团队：在推荐的结果中，如果出现无货或者下架的商品，我们将不会展示给用户。作为替代，我们将会给用户推荐它的相关或者相似的商品。这些相...
Why historically do people use 255 not 256 for database field magnitudes?
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255 was the varchar limit in mySQL4 and earlier.
Also 255 chars + Null terminator = 256
Or 1 byte length descriptor gives a possible range 0-255 chars
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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...的服务和特征，而无需知道确切的 UUID 或有关服务和特征如何工作的详细信息。 所选择的服务和特征使得能够读取或写入特征数据值。 例如，通过电池电量服务和特性，可以监控所连接设备的电池电量。 由于 GATT 服务和特性的...
How do I create a PDO parameterized query with a LIKE statement?
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thanks. had similar issue with csharp + Mysql + ODBC using like it would not return any rows using "select * from table where column like '%?%';" but will if I do like you did "select * from table where column like ?;" and set the parameter string so: string frag =...
Hibernate throws org.hibernate.AnnotationException: No identifier specified for entity: com..domain.
...er since 2012). The only major database that does not support sequences is MySQL.
The problem with IDENTITY is that automatic Hibernate batch inserts are disabled for this strategy. For more details about this topic, check out this article.
The SEQUENCE strategy is the best choice unless you a...