Mysql2 Cs Bind Save

'mysql2' extension to add pseudo prepared statement

Project README


'mysql2-cs-bind' is extension of 'mysql2', to add method of client-side variable binding (pseudo prepared statement).


Add this line to your application's Gemfile:

gem 'mysql2-cs-bind'

And then execute:

$ bundle

Or install it yourself as:

$ gem install mysql2-cs-bind


Require 'mysql2-cs-bind' instead of (or after) 'mysql2', you can use Mysql2::Client#xquery with bound variables like below:

require 'mysql2-cs-bind'
client =
client.xquery('SELECT x,y,z FROM tbl WHERE x=? AND y=?', val1, val2) #=> Mysql2::Result

Mysql2::Client#xquery receives query, variables, and options(hash) for Mysql2::Client#query.

client.xquery(sql, :as => :array)
client.xquery(sql, val1, val2)
client.xquery(sql, [val1, val2])
client.xquery(sql, val1, val2, :as => :array)
client.xquery(sql, [val1, val2], :as => :array)

Mysql2::Client#xquery raises ArgumentError if mismatch found between placeholder number and arguments

client.xquery('SELECT x FROM tbl', 1)                   # ArgumentError
client.xquery('SELECT x FROM tbl WHERE x=? AND y=?', 1) # ArgumentError
client.xquery('SELECT x FROM tbl WHERE x=?', 1, 2)      # ArgumentError

Formatting for nil and Time objects:

client.xquery('INSERT INTO tbl (val1,created_at) VALUES (?,?)', nil,
#execute "INSERT INTO tbl (val1,created_at) VALUES (NULL,'2012-01-02 13:45:01')"

Expanding for Array object.

client.xquery('SELECT val1 FROM tbl WHERE id IN (?)', [[1,2,3]])
#execute "SELECT val1 FROM tbl WHERE id IN ('1','2','3')"

Type Conversion of Numbers

Mysql2::Client#xquery quotes any values as STRING. This may not be problems for almost all kind of queries, but sometimes you may be confused by return value types:

client.query('SELECT 1', :as => :array).first #=> [1]
client.xquery('SELECT ?', 1, :as => :array).first #=> ['1']


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Copyright (c) 2012- TAGOMORI Satoshi (tagomoris)



Open Source Agenda is not affiliated with "Mysql2 Cs Bind" Project. README Source: tagomoris/mysql2-cs-bind
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