大约有 3,620 项符合查询结果（耗时：0.0207秒） [XML]
Dynamic LINQ OrderBy on IEnumerable / IQueryable
...example in the VS2008 Examples for Dynamic LINQ that allows you to use a sql-like string (e.g. OrderBy("Name, Age DESC")) for ordering. Unfortunately, the method included only works on IQueryable<T> . Is there any way to get this functionality on IEnumerable<T> ?
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Difference between Repository and Service Layer?
...Service could return only ones, user has access to.
In ASP.NET MVC + EF + SQL SERVER, I have this flow of communication:
Views <- Controllers -> Service layer -> Repository layer -> EF -> SQL Server
Service layer -> Repository layer -> EF This part operates on models.
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How to make connection to Postgres via Node.js
...se, so I installed postgres and started a server with initdb /usr/local/pgsql/data , then I started that instance with postgres -D /usr/local/pgsql/data now how can I interact with this through node? For example, what would the connectionstring be, or how am I able to find out what it is.
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How important is the order of columns in indexes?
...hat I am illustrating in a very simple way. This isn't very unique or even SQL specific; B-tree indexing is pretty common across so many things.
– Nick Craver♦
Aug 23 '16 at 10:11
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How do you track record relations in NoSQL?
I am trying to figure out the equivalent of foreign keys and indexes in NoSQL KVP or Document databases. Since there are no pivotal tables (to add keys marking a relation between two objects) I am really stumped as to how you would be able to retrieve data in a way that would be useful for normal we...
ROW_NUMBER() in MySQL
Is there a nice way in MySQL to replicate the SQL Server function ROW_NUMBER() ?
24 Answers
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How do I reset a sequence in Oracle?
In PostgreSQL , I can do something like this:
18 Answers
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Checkout one file from Subversion
... cd /tmp
$ svn co --depth empty http://svn.your.company.ca/training/trunk/sql
Run svn up to update specified file:
$ svn up http://svn.your.company.ca/training/trunk/sql/showSID.sql
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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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