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# sqlite_adapter.rb
# author: Luke Holden <lholden@cablelan.net>
# updated for SQLite3: Jamis Buck <jamis_buck@byu.edu>
require 'active_record/connection_adapters/abstract_adapter'
module ActiveRecord
class Base
class << self
# sqlite3 adapter reuses sqlite_connection.
def sqlite3_connection(config) # :nodoc:
parse_config!(config)
unless self.class.const_defined?(:SQLite3)
require_library_or_gem(config[:adapter])
end
db = SQLite3::Database.new(
config[:dbfile],
:results_as_hash => true,
:type_translation => false
)
ConnectionAdapters::SQLiteAdapter.new(db, logger)
end
# Establishes a connection to the database that's used by all Active Record objects
def sqlite_connection(config) # :nodoc:
parse_config!(config)
unless self.class.const_defined?(:SQLite)
require_library_or_gem(config[:adapter])
db = SQLite::Database.new(config[:dbfile], 0)
db.show_datatypes = "ON" if !defined? SQLite::Version
db.results_as_hash = true if defined? SQLite::Version
db.type_translation = false
# "Downgrade" deprecated sqlite API
if SQLite.const_defined?(:Version)
ConnectionAdapters::SQLiteAdapter.new(db, logger)
else
ConnectionAdapters::DeprecatedSQLiteAdapter.new(db, logger)
end
end
end
private
def parse_config!(config)
# Require dbfile.
unless config.has_key?(:dbfile)
raise ArgumentError, "No database file specified. Missing argument: dbfile"
end
# Allow database path relative to RAILS_ROOT.
if Object.const_defined?(:RAILS_ROOT)
config[:dbfile] = File.expand_path(config[:dbfile], RAILS_ROOT)
end
end
end
end
module ConnectionAdapters #:nodoc:
class SQLiteColumn < Column #:nodoc:
def string_to_binary(value)
value.gsub(/(\0|\%)/) do
case $1
when "\0" then "%00"
when "%" then "%25"
end
end
end
def binary_to_string(value)
value.gsub(/(%00|%25)/) do
case $1
when "%00" then "\0"
when "%25" then "%"
end
end
end
end
# The SQLite adapter works with both the 2.x and 3.x series of SQLite with the sqlite-ruby drivers (available both as gems and
# from http://rubyforge.org/projects/sqlite-ruby/).
#
# Options:
#
# * <tt>:dbfile</tt> -- Path to the database file.
class SQLiteAdapter < AbstractAdapter
def execute(sql, name = nil)
log(sql, name) { @connection.execute(sql) }
end
def update(sql, name = nil)
execute(sql, name)
@connection.changes
end
def delete(sql, name = nil)
sql += " WHERE 1=1" unless sql =~ /WHERE/i
execute(sql, name)
@connection.changes
end
def insert(sql, name = nil, pk = nil, id_value = nil)
execute(sql, name = nil)
id_value || @connection.last_insert_row_id
end
def select_all(sql, name = nil)
execute(sql, name).map do |row|
record = {}
row.each_key do |key|
record[key.sub(/\w+\./, '')] = row[key] unless key.is_a?(Fixnum)
end
record
end
end
def select_one(sql, name = nil)
result = select_all(sql, name)
result.nil? ? nil : result.first
end
def begin_db_transaction() @connection.transaction end
def commit_db_transaction() @connection.commit end
def rollback_db_transaction() @connection.rollback end
def tables
execute('.table').map { |table| Table.new(table) }
end
def columns(table_name, name = nil)
table_structure(table_name).map { |field|
SQLiteColumn.new(field['name'], field['dflt_value'], field['type'])
}
end
def quote_string(s)
@connection.class.quote(s)
end
def quote_column_name(name)
return "'#{name}'"
end
def adapter_name()
'SQLite'
end
protected
def table_structure(table_name)
execute "PRAGMA table_info(#{table_name})"
end
end
class DeprecatedSQLiteAdapter < SQLiteAdapter # :nodoc:
def insert(sql, name = nil, pk = nil, id_value = nil)
execute(sql, name = nil)
id_value || @connection.last_insert_rowid
end
end
end
end
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