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69 lines
2.0 KiB
69 lines
2.0 KiB
module Carto
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module Db
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# Simple database interface that can be used through Sequel or ActiveRecord connections
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# (e.g. as returned by User#in_database and Carto::User#in_database respectively)
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# It provides two operations:
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# * run to execute an SQL statement disregarding any results
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# * fetch to obtain the resulting rows of a SQL SELECT
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# the result is an array of hashes using symbol keys (with the name of the columns).
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# The types of tuple values may vary between Sequel and ActiveRecord (ActiveRecord keeps them as text)
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# If a block is passed to this method it receives each of the rows
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class SqlInterface
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class Error < RuntimeError; end
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module SequelConnection
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def run(sql)
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@db_connection.run(sql)
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nil
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rescue Sequel::DatabaseError => e
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raise Error.new(e.message)
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end
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def fetch(sql, &block)
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if block
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@db_connection.fetch(sql, &block)
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nil
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else
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@db_connection.fetch(sql, &block).all
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end
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rescue Sequel::DatabaseError => e
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raise Error.new(e.message)
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end
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end
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module ActiveRecordConnection
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def run(sql)
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@db_connection.execute(sql)
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nil
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rescue ActiveRecord::StatementInvalid => e
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raise Error.new(e.message)
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end
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def fetch(sql, &block)
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rows = @db_connection.select_all(sql).map(&:symbolize_keys)
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if block
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rows.each &block
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nil
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else
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rows
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end
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rescue ActiveRecord::StatementInvalid => e
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raise Error.new(e.message)
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end
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end
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def initialize(db_connection)
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@db_connection = db_connection
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case db_connection
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when Sequel::Postgres::Database
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extend SequelConnection
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when ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
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extend ActiveRecordConnection
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else
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raise "Invalid database connection"
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end
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end
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end
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end
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end
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