83 lines
1.8 KiB
Ruby
83 lines
1.8 KiB
Ruby
module Gitlab
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module Database
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# The max value of INTEGER type is the same between MySQL and PostgreSQL:
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# https://www.postgresql.org/docs/9.2/static/datatype-numeric.html
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# http://dev.mysql.com/doc/refman/5.7/en/integer-types.html
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MAX_INT_VALUE = 2147483647
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def self.adapter_name
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connection.adapter_name
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end
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def self.mysql?
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adapter_name.casecmp('mysql2').zero?
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end
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def self.postgresql?
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adapter_name.casecmp('postgresql').zero?
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end
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def self.version
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database_version.match(/\A(?:PostgreSQL |)([^\s]+).*\z/)[1]
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end
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def self.nulls_last_order(field, direction = 'ASC')
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order = "#{field} #{direction}"
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if Gitlab::Database.postgresql?
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order << ' NULLS LAST'
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else
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# `field IS NULL` will be `0` for non-NULL columns and `1` for NULL
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# columns. In the (default) ascending order, `0` comes first.
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order.prepend("#{field} IS NULL, ") if direction == 'ASC'
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end
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order
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end
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def self.serialized_transaction
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opts = {}
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opts[:isolation] = :serializable unless Rails.env.test? && connection.transaction_open?
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connection.transaction(opts) { yield }
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end
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def self.random
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Gitlab::Database.postgresql? ? "RANDOM()" : "RAND()"
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end
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def true_value
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if Gitlab::Database.postgresql?
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"'t'"
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else
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1
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end
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end
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def false_value
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if Gitlab::Database.postgresql?
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"'f'"
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else
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0
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end
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end
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def self.connection
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ActiveRecord::Base.connection
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end
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private_class_method :connection
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def self.database_version
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row = connection.execute("SELECT VERSION()").first
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if postgresql?
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row['version']
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else
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row.first
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end
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end
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private_class_method :database_version
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end
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end
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