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boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
...lational databases, composite keys depend on two or more fields of a given table The analogous concept in Boost MultiIndex is Composite keys
In relational databases, composite keys depend on two or more fields of a given table. The analogous concept in Boost.MultiIndex is modeled by means of com...
Change default primary key in Eloquent
...gusflyer You are kidding right ? More than one primary key in one database table?
– Novica89
Oct 1 '14 at 10:39
@bagus...
Parameterize an SQL IN clause
...
Yes, this is a table scan. Great for 10 rows, lousy for 100,000.
– Will Hartung
Dec 3 '08 at 16:48
17
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Are Exceptions in C++ really slow
...g for the presence of exceptions everywhere, the compiler generates a side table that maps any point that may throw an exception (Program Counter) to the a list of handlers. When an exception is thrown, this list is consulted to pick the right handler (if any) and stack is unwound.
Compared to the ...
How to understand Locality Sensitive Hashing?
...akes as input a set of documents/images/objects and outputs a kind of Hash Table.
The indexes of this table contain the documents such that documents that are on the same index are considered similar and those on different indexes are "dissimilar".
Where similar depends on the metric system and ...
Generating v5 UUID. What is name and namespace?
...ds to be "very secure"). That said, it gives you a way of creating a repeatable/verifiable "hash" function mapping a possibly hierarchical name onto a probabilistically unique 128-bit value, potentially acting like a hierarchical hash or MAC.
Suppose you have a (key,value) store, but it only suppo...
How do I create a parameterized SQL query? Why Should I?
...n some circles) to prevent input like this from causing damage:
';DROP TABLE bar;--
Try putting that in your fuz variable (or don't, if you value your bar table). More subtle and damaging queries are possible as well.
Here's an example of how you do parameters with Sql Server:
Public Functi...
How to print a query string with parameter values when using Hibernate
...Output showing generated SQL with params in place together with result set table from query:
5. insert into ENQUIRY_APPLICANT_DETAILS (ID, INCLUDED_IN_QUOTE, APPLICANT_ID, TERRITORY_ID, ENQUIRY_ID, ELIGIBLE_FOR_COVER) values (7, 1, 11, 1, 2, 0)
10 Oct 2013 16:21:22 4953 [main] INFO jdbc.results...
Double exclamation points? [duplicate]
... then it may not be 0 but some other falsy value. See the following truth table:
Truth Table for javascript
'' == '0' // false
0 == '' // true
0 == '0' // true
false == 'false' // false
false == '0' // true
fa...
Why can a class not be defined as protected?
...nswered Oct 6 '10 at 4:51
irreputableirreputable
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