144 lines
3.5 KiB
Ruby
144 lines
3.5 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.config
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ActiveRecord::Base.configurations[Rails.env]
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end
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def self.adapter_name
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config['adapter']
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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.join_lateral_supported?
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postgresql? && version.to_f >= 9.3
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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 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.nulls_first_order(field, direction = 'ASC')
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order = "#{field} #{direction}"
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if postgresql?
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order << ' NULLS FIRST'
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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 == 'DESC'
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end
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order
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end
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def self.random
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postgresql? ? "RANDOM()" : "RAND()"
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end
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def self.true_value
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if 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 self.false_value
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if 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.with_connection_pool(pool_size)
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pool = create_connection_pool(pool_size)
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begin
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yield(pool)
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ensure
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pool.disconnect!
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end
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end
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def self.bulk_insert(table, rows)
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return if rows.empty?
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keys = rows.first.keys
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columns = keys.map { |key| connection.quote_column_name(key) }
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tuples = rows.map do |row|
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row.values_at(*keys).map { |value| connection.quote(value) }
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end
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connection.execute <<-EOF
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INSERT INTO #{table} (#{columns.join(', ')})
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VALUES #{tuples.map { |tuple| "(#{tuple.join(', ')})" }.join(', ')}
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EOF
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end
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# pool_size - The size of the DB pool.
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# host - An optional host name to use instead of the default one.
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def self.create_connection_pool(pool_size, host = nil)
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# See activerecord-4.2.7.1/lib/active_record/connection_adapters/connection_specification.rb
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env = Rails.env
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original_config = ActiveRecord::Base.configurations
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env_config = original_config[env].merge('pool' => pool_size)
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env_config['host'] = host if host
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config = original_config.merge(env => env_config)
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spec =
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ActiveRecord::
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ConnectionAdapters::
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ConnectionSpecification::Resolver.new(config).spec(env.to_sym)
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ActiveRecord::ConnectionAdapters::ConnectionPool.new(spec)
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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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