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plurals

PO
primarykey
Id
12514997
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-09-20T14:37:11.597
FavoriteCount
0
LastActivityDate
2012-09-20T16:28:58.663
LastEditDate
2012-09-20T16:28:58.663
LastEditorUserId
120067
OwnerUserId
120067
ParentId
2986405
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
text
Body
It hasn't received much usage yet but I wrote the following code which seems to solve the problem. This monkey-patches the adapters to have a method to support it: <pre><code>module ActiveRecord module ConnectionAdapters class AbstractAdapter # Will return the given strings as a SQL concationation. By default # uses the SQL-92 syntax: # # concat('foo', 'bar') -> "foo || bar" def concat(*args) args * " || " end end class AbstractMysqlAdapter < AbstractAdapter # Will return the given strings as a SQL concationation. # Uses MySQL format: # # concat('foo', 'bar') -> "CONCAT(foo, bar)" def concat(*args) "CONCAT(#{args * ', '})" end end class SQLServerAdapter < AbstractAdapter # Will return the given strings as a SQL concationation. # Uses MS-SQL format: # # concat('foo', 'bar') -> foo + bar def concat(*args) args * ' + ' end end end end </code></pre> With this you should be able to do the following in your code: <pre><code>class User < ActiveRecord::Base def self.find_by_name(name) where("#{connection.concat('first_name', 'last_name')} = ?", name) end end </code></pre> This outputs the following SQL query on a SQL-92 database (Oracle, SQLite, PostgreSQL): <pre><code>SELECT * FROM users WHERE first_name || last_name = ? </code></pre> For MySQL it outputs: <pre><code>SELECT * FROM users WHERE CONCAT(first_name, last_name) = ? </code></pre> For SQL Server it outputs <pre><code>SELECT * FROM users WHERE first_name + last_name = ? </code></pre> Obviously you could extend this concept to other database adapters.
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Title
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1. This table or related slice is empty.
PostParentId
1. PODatabase-independent SQL String Concatenation in Rails
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USEric Anderson
UserOwnerUserId
1. USEric Anderson
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1. VO
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 VTUpMod
2. VO
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3. VO
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1. This table or related slice is empty.

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