--- /dev/null
+require 'active_record/connection_adapters/abstract_adapter'
+
+module ActiveRecord
+ class Base
+ class << self
+ # Establishes a connection to the database that's used by all Active Record objects
+ def sqlite_connection(config) # :nodoc:
+ parse_sqlite_config!(config)
+
+ unless self.class.const_defined?(:SQLite)
+ require_library_or_gem(config[:adapter])
+
+ db = SQLite::Database.new(config[:database], 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::SQLite2Adapter.new(db, logger)
+ else
+ ConnectionAdapters::DeprecatedSQLiteAdapter.new(db, logger)
+ end
+ end
+ end
+
+ private
+ def parse_sqlite_config!(config)
+ config[:database] ||= config[:dbfile]
+ # Require database.
+ unless config[:database]
+ raise ArgumentError, "No database file specified. Missing argument: database"
+ end
+
+ # Allow database path relative to RAILS_ROOT, but only if
+ # the database path is not the special path that tells
+ # Sqlite to build a database only in memory.
+ if Object.const_defined?(:RAILS_ROOT) && ':memory:' != config[:database]
+ config[:database] = File.expand_path(config[:database], RAILS_ROOT)
+ end
+ end
+ end
+ end
+
+ module ConnectionAdapters #:nodoc:
+ class SQLiteColumn < Column #:nodoc:
+ class << self
+ def string_to_binary(value)
+ value.gsub(/\0|\%/n) do |b|
+ case b
+ when "\0" then "%00"
+ when "%" then "%25"
+ end
+ end
+ end
+
+ def binary_to_string(value)
+ value.gsub(/%00|%25/n) do |b|
+ case b
+ when "%00" then "\0"
+ when "%25" then "%"
+ end
+ 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>:database</tt> - Path to the database file.
+ class SQLiteAdapter < AbstractAdapter
+ def adapter_name #:nodoc:
+ 'SQLite'
+ end
+
+ def supports_migrations? #:nodoc:
+ true
+ end
+
+ def requires_reloading?
+ true
+ end
+
+ def disconnect!
+ super
+ @connection.close rescue nil
+ end
+
+ def supports_count_distinct? #:nodoc:
+ sqlite_version >= '3.2.6'
+ end
+
+ def supports_autoincrement? #:nodoc:
+ sqlite_version >= '3.1.0'
+ end
+
+ def native_database_types #:nodoc:
+ {
+ :primary_key => default_primary_key_type,
+ :string => { :name => "varchar", :limit => 255 },
+ :text => { :name => "text" },
+ :integer => { :name => "integer" },
+ :float => { :name => "float" },
+ :decimal => { :name => "decimal" },
+ :datetime => { :name => "datetime" },
+ :timestamp => { :name => "datetime" },
+ :time => { :name => "time" },
+ :date => { :name => "date" },
+ :binary => { :name => "blob" },
+ :boolean => { :name => "boolean" }
+ }
+ end
+
+
+ # QUOTING ==================================================
+
+ def quote_string(s) #:nodoc:
+ @connection.class.quote(s)
+ end
+
+ def quote_column_name(name) #:nodoc:
+ %Q("#{name}")
+ end
+
+
+ # DATABASE STATEMENTS ======================================
+
+ def execute(sql, name = nil) #:nodoc:
+ catch_schema_changes { log(sql, name) { @connection.execute(sql) } }
+ end
+
+ def update_sql(sql, name = nil) #:nodoc:
+ super
+ @connection.changes
+ end
+
+ def delete_sql(sql, name = nil) #:nodoc:
+ sql += " WHERE 1=1" unless sql =~ /WHERE/i
+ super sql, name
+ end
+
+ def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc:
+ super || @connection.last_insert_row_id
+ end
+
+ def select_rows(sql, name = nil)
+ execute(sql, name).map do |row|
+ (0...(row.size / 2)).map { |i| row[i] }
+ end
+ end
+
+ def begin_db_transaction #:nodoc:
+ catch_schema_changes { @connection.transaction }
+ end
+
+ def commit_db_transaction #:nodoc:
+ catch_schema_changes { @connection.commit }
+ end
+
+ def rollback_db_transaction #:nodoc:
+ catch_schema_changes { @connection.rollback }
+ end
+
+
+ # SELECT ... FOR UPDATE is redundant since the table is locked.
+ def add_lock!(sql, options) #:nodoc:
+ sql
+ end
+
+
+ # SCHEMA STATEMENTS ========================================
+
+ def tables(name = nil) #:nodoc:
+ sql = <<-SQL
+ SELECT name
+ FROM sqlite_master
+ WHERE type = 'table' AND NOT name = 'sqlite_sequence'
+ SQL
+
+ execute(sql, name).map do |row|
+ row[0]
+ end
+ end
+
+ def columns(table_name, name = nil) #:nodoc:
+ table_structure(table_name).map do |field|
+ SQLiteColumn.new(field['name'], field['dflt_value'], field['type'], field['notnull'] == "0")
+ end
+ end
+
+ def indexes(table_name, name = nil) #:nodoc:
+ execute("PRAGMA index_list(#{quote_table_name(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) #:nodoc:
+ column = table_structure(table_name).find {|field| field['pk'].to_i == 1}
+ column ? column['name'] : nil
+ end
+
+ def remove_index(table_name, options={}) #:nodoc:
+ execute "DROP INDEX #{quote_column_name(index_name(table_name, options))}"
+ end
+
+ def rename_table(name, new_name)
+ execute "ALTER TABLE #{name} RENAME TO #{new_name}"
+ end
+
+ def add_column(table_name, column_name, type, options = {}) #:nodoc:
+ if @connection.respond_to?(:transaction_active?) && @connection.transaction_active?
+ raise StatementInvalid, 'Cannot add columns to a SQLite database while inside a transaction'
+ end
+
+ super(table_name, column_name, type, options)
+ # See last paragraph on http://www.sqlite.org/lang_altertable.html
+ execute "VACUUM"
+ end
+
+ def remove_column(table_name, *column_names) #:nodoc:
+ column_names.flatten.each do |column_name|
+ alter_table(table_name) do |definition|
+ definition.columns.delete(definition[column_name])
+ end
+ end
+ end
+ alias :remove_columns :remove_column
+
+ def change_column_default(table_name, column_name, default) #:nodoc:
+ alter_table(table_name) do |definition|
+ definition[column_name].default = default
+ end
+ end
+
+ def change_column_null(table_name, column_name, null, default = nil)
+ unless null || default.nil?
+ execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
+ end
+ alter_table(table_name) do |definition|
+ definition[column_name].null = null
+ end
+ end
+
+ def change_column(table_name, column_name, type, options = {}) #:nodoc:
+ alter_table(table_name) do |definition|
+ include_default = options_include_default?(options)
+ definition[column_name].instance_eval do
+ self.type = type
+ self.limit = options[:limit] if options.include?(:limit)
+ self.default = options[:default] if include_default
+ self.null = options[:null] if options.include?(:null)
+ end
+ end
+ end
+
+ def rename_column(table_name, column_name, new_column_name) #:nodoc:
+ unless columns(table_name).detect{|c| c.name == column_name.to_s }
+ raise ActiveRecord::ActiveRecordError, "Missing column #{table_name}.#{column_name}"
+ end
+ alter_table(table_name, :rename => {column_name.to_s => new_column_name.to_s})
+ end
+
+ def empty_insert_statement(table_name)
+ "INSERT INTO #{table_name} VALUES(NULL)"
+ end
+
+ protected
+ def select(sql, name = nil) #:nodoc:
+ 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 table_structure(table_name)
+ returning structure = execute("PRAGMA table_info(#{quote_table_name(table_name)})") do
+ raise(ActiveRecord::StatementInvalid, "Could not find table '#{table_name}'") 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:
+ options = options.merge(:id => !columns(from).detect{|c| c.name == 'id'}.nil?)
+ create_table(to, options) do |definition|
+ @definition = definition
+ columns(from).each do |column|
+ column_name = options[:rename] ?
+ (options[:rename][column.name] ||
+ options[:rename][column.name.to_sym] ||
+ column.name) : column.name
+
+ @definition.column(column_name, column.type,
+ :limit => column.limit, :default => column.default,
+ :null => column.null)
+ end
+ @definition.primary_key(primary_key(from)) if primary_key(from)
+ yield @definition if block_given?
+ end
+
+ copy_table_indexes(from, to, options[:rename] || {})
+ copy_table_contents(from, to,
+ @definition.columns.map {|column| column.name},
+ options[:rename] || {})
+ end
+
+ def copy_table_indexes(from, to, rename = {}) #: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
+
+ to_column_names = columns(to).map(&:name)
+ columns = index.columns.map {|c| rename[c] || c }.select do |column|
+ to_column_names.include?(column)
+ end
+
+ unless columns.empty?
+ # index name can't be the same
+ opts = { :name => name.gsub(/_(#{from})_/, "_#{to}_") }
+ opts[:unique] = true if index.unique
+ add_index(to, columns, opts)
+ end
+ 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}
+ from_columns = columns(from).collect {|col| col.name}
+ columns = columns.find_all{|col| from_columns.include?(column_mappings[col])}
+ quoted_columns = columns.map { |col| quote_column_name(col) } * ','
+
+ quoted_to = quote_table_name(to)
+ @connection.execute "SELECT * FROM #{quote_table_name(from)}" do |row|
+ sql = "INSERT INTO #{quoted_to} (#{quoted_columns}) VALUES ("
+ sql << columns.map {|col| quote row[column_mappings[col]]} * ', '
+ sql << ')'
+ @connection.execute sql
+ end
+ end
+
+ def catch_schema_changes
+ return yield
+ rescue ActiveRecord::StatementInvalid => exception
+ if exception.message =~ /database schema has changed/
+ reconnect!
+ retry
+ else
+ raise
+ end
+ end
+
+ def sqlite_version
+ @sqlite_version ||= select_value('select sqlite_version(*)')
+ end
+
+ def default_primary_key_type
+ if supports_autoincrement?
+ 'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'.freeze
+ else
+ 'INTEGER PRIMARY KEY NOT NULL'.freeze
+ end
+ end
+ end
+
+ class SQLite2Adapter < SQLiteAdapter # :nodoc:
+ def supports_count_distinct? #:nodoc:
+ false
+ end
+
+ def rename_table(name, new_name)
+ move_table(name, new_name)
+ end
+
+ def add_column(table_name, column_name, type, options = {}) #:nodoc:
+ alter_table(table_name) do |definition|
+ definition.column(column_name, type, options)
+ end
+ end
+ end
+
+ class DeprecatedSQLiteAdapter < SQLite2Adapter # :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
projects / depot.git / blobdiff