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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 native_database_types
{
:primary_key => "INTEGER PRIMARY KEY NOT NULL",
:string => { :name => "varchar", :limit => 255 },
:text => { :name => "text" },
:integer => { :name => "integer" },
:float => { :name => "float" },
:datetime => { :name => "datetime" },
:timestamp => { :name => "datetime" },
:time => { :name => "datetime" },
:date => { :name => "date" },
:binary => { :name => "blob" },
:boolean => { :name => "boolean" }
}
end
def supports_migrations?
true
end
def execute(sql, name = nil)
#log(sql, name, @connection) { |connection| connection.execute(sql) }
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, sequence_name = 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|
if key.is_a?(String)
record[key.sub(/^\w+\./, '')] = row[key]
end
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(name = nil)
execute("SELECT name FROM sqlite_master WHERE type = 'table'", name).map do |row|
row[0]
end
end
def columns(table_name, name = nil)
table_structure(table_name).map { |field|
SQLiteColumn.new(field['name'], field['dflt_value'], field['type'], field['notnull'] == "0")
}
end
def indexes(table_name, name = nil)
execute("PRAGMA index_list(#{table_name})", name).map do |row|
index = IndexDefinition.new(table_name, row['name'])
index.unique = row['unique'] != '0'
index.columns = execute("PRAGMA index_info('#{index.name}')").map { |col| col['name'] }
index
end
end
def primary_key(table_name)
column = table_structure(table_name).find {|field| field['pk'].to_i == 1}
column ? column['name'] : nil
end
def quote_string(s)
@connection.class.quote(s)
end
def quote_column_name(name)
"'#{name}'"
end
def adapter_name()
'SQLite'
end
def remove_index(table_name, options={})
if Hash === options
index_name = options[:name]
else
index_name = "#{table_name}_#{options}_index"
end
execute "DROP INDEX #{index_name}"
end
def add_column(table_name, column_name, type, options = {})
alter_table(table_name) do |definition|
definition.column(column_name, type, options)
end
end
def remove_column(table_name, column_name)
alter_table(table_name) do |definition|
definition.columns.delete(definition[column_name])
end
end
def change_column_default(table_name, column_name, default)
alter_table(table_name) do |definition|
definition[column_name].default = default
end
end
def change_column(table_name, column_name, type, options = {})
alter_table(table_name) do |definition|
definition[column_name].instance_eval do
self.type = type
self.limit = options[:limit] if options[:limit]
self.default = options[:default] if options[:default]
end
end
end
def rename_column(table_name, column_name, new_column_name)
alter_table(table_name, :rename => {column_name => new_column_name})
end
protected
def table_structure(table_name)
returning structure = execute("PRAGMA table_info(#{table_name})") do
raise ActiveRecord::StatementInvalid if structure.empty?
end
end
def alter_table(table_name, options = {}) #:nodoc:
altered_table_name = "altered_#{table_name}"
caller = lambda {|definition| yield definition if block_given?}
transaction do
move_table(table_name, altered_table_name,
options.merge(:temporary => true))
move_table(altered_table_name, table_name, &caller)
end
end
def move_table(from, to, options = {}, &block) #:nodoc:
copy_table(from, to, options, &block)
drop_table(from)
end
def copy_table(from, to, options = {}) #:nodoc:
create_table(to, options) do |@definition|
columns(from).each do |column|
column_name = options[:rename][column.name] if
options[:rename][column.name] if options[:rename]
@definition.column(column_name || column.name, column.type,
:limit => column.limit, :default => column.default,
:null => column.null)
end
@definition.primary_key(primary_key(from))
yield @definition if block_given?
end
copy_table_indexes(from, to)
copy_table_contents(from, to,
@definition.columns.map {|column| column.name},
options[:rename] || {})
end
def copy_table_indexes(from, to) #:nodoc:
indexes(from).each do |index|
name = index.name
if to == "altered_#{from}"
name = "temp_#{name}"
elsif from == "altered_#{to}"
name = name[5..-1]
end
opts = { :name => name }
opts[:unique] = true if index.unique
add_index(to, index.columns, opts)
end
end
def copy_table_contents(from, to, columns, rename = {}) #:nodoc:
column_mappings = Hash[*columns.map {|name| [name, name]}.flatten]
rename.inject(column_mappings) {|map, a| map[a.last] = a.first; map}
@connection.execute "SELECT * FROM #{from}" do |row|
sql = "INSERT INTO #{to} VALUES ("
sql << columns.map {|col| quote row[column_mappings[col]]} * ', '
sql << ')'
@connection.execute sql
end
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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