X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=vendor%2Frails%2Factiverecord%2Flib%2Factive_record%2Fconnection_adapters%2Fsqlite_adapter.rb;fp=vendor%2Frails%2Factiverecord%2Flib%2Factive_record%2Fconnection_adapters%2Fsqlite_adapter.rb;h=afd6472db80465b384c9e1867671cf5436b0fcbc;hb=437aa336c44c74a30aeea16a06743c32747ed661;hp=0000000000000000000000000000000000000000;hpb=97a0772b06264134cfe38e7494f9427efe0840a0;p=feedcatcher.git

diff --git a/vendor/rails/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/vendor/rails/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
new file mode 100644
index 0000000..afd6472
--- /dev/null
+++ b/vendor/rails/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -0,0 +1,438 @@
+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, config)
+          else
+            ConnectionAdapters::DeprecatedSQLiteAdapter.new(db, logger, config)
+          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
+      class Version
+        include Comparable
+
+        def initialize(version_string)
+          @version = version_string.split('.').map(&:to_i)
+        end
+
+        def <=>(version_string)
+          @version <=> version_string.split('.').map(&:to_i)
+        end
+      end
+
+      def initialize(connection, logger, config)
+        super(connection, logger)
+        @config = config
+      end
+
+      def adapter_name #:nodoc:
+        'SQLite'
+      end
+
+      def supports_ddl_transactions?
+        sqlite_version >= '2.0.0'
+      end
+
+      def supports_migrations? #:nodoc:
+        true
+      end
+
+      def requires_reloading?
+        true
+      end
+
+      def supports_add_column?
+        sqlite_version >= '3.1.6'
+      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
+
+      # See: http://www.sqlite.org/lang_altertable.html
+      # SQLite has an additional restriction on the ALTER TABLE statement
+      def valid_alter_table_options( type, options)
+        type.to_sym != :primary_key
+      end
+
+      def add_column(table_name, column_name, type, options = {}) #:nodoc:
+        if supports_add_column? && valid_alter_table_options( type, options )
+          super(table_name, column_name, type, options)
+        else
+          alter_table(table_name) do |definition|
+            definition.column(column_name, type, options)
+          end
+        end
+      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? && 'id' == primary_key(from).to_s))
+          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 ||= SQLiteAdapter::Version.new(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 rename_table(name, new_name)
+        move_table(name, new_name)
+      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