diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb')
| -rw-r--r-- | activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb | 201 |
1 files changed, 138 insertions, 63 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb index 6fae899e87..5a830a50fb 100644 --- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb @@ -1,20 +1,19 @@ require 'active_record/connection_adapters/abstract_adapter' require 'active_support/core_ext/kernel/requires' require 'active_support/core_ext/object/blank' +require 'pg' module ActiveRecord class Base # Establishes a connection to the database that's used by all Active Record objects def self.postgresql_connection(config) # :nodoc: - require 'pg' - config = config.symbolize_keys host = config[:host] port = config[:port] || 5432 username = config[:username].to_s if config[:username] password = config[:password].to_s if config[:password] - if config.has_key?(:database) + if config.key?(:database) database = config[:database] else raise ArgumentError, "No database specified. Missing argument: database." @@ -27,12 +26,6 @@ module ActiveRecord end module ConnectionAdapters - class TableDefinition - def xml(*args) - options = args.extract_options! - column(args[0], 'xml', options) - end - end # PostgreSQL-specific extensions to column definitions in a table. class PostgreSQLColumn < Column #:nodoc: # Instantiates a new PostgreSQL column definition in a table. @@ -170,9 +163,7 @@ module ActiveRecord end end end - end - module ConnectionAdapters # The PostgreSQL adapter works both with the native C (http://ruby.scripting.ca/postgres/) and the pure # Ruby (available both as gem and from http://rubyforge.org/frs/?group_id=234&release_id=1944) drivers. # @@ -183,19 +174,24 @@ module ActiveRecord # * <tt>:username</tt> - Defaults to nothing. # * <tt>:password</tt> - Defaults to nothing. # * <tt>:database</tt> - The name of the database. No default, must be provided. - # * <tt>:schema_search_path</tt> - An optional schema search path for the connection given + # * <tt>:schema_search_path</tt> - An optional schema search path for the connection given # as a string of comma-separated schema names. This is backward-compatible with the <tt>:schema_order</tt> option. - # * <tt>:encoding</tt> - An optional client encoding that is used in a <tt>SET client_encoding TO + # * <tt>:encoding</tt> - An optional client encoding that is used in a <tt>SET client_encoding TO # <encoding></tt> call on the connection. - # * <tt>:min_messages</tt> - An optional client min messages that is used in a + # * <tt>:min_messages</tt> - An optional client min messages that is used in a # <tt>SET client_min_messages TO <min_messages></tt> call on the connection. - # * <tt>:allow_concurrency</tt> - If true, use async query methods so Ruby threads don't deadlock; - # otherwise, use blocking query methods. class PostgreSQLAdapter < AbstractAdapter - ADAPTER_NAME = 'PostgreSQL'.freeze + class TableDefinition < ActiveRecord::ConnectionAdapters::TableDefinition + def xml(*args) + options = args.extract_options! + column(args[0], 'xml', options) + end + end + + ADAPTER_NAME = 'PostgreSQL' NATIVE_DATABASE_TYPES = { - :primary_key => "serial primary key".freeze, + :primary_key => "serial primary key", :string => { :name => "character varying", :limit => 255 }, :text => { :name => "text" }, :integer => { :name => "integer" }, @@ -215,6 +211,12 @@ module ActiveRecord ADAPTER_NAME end + # Returns +true+ when the connection adapter supports prepared statement + # caching, otherwise returns +false+ + def supports_statement_cache? + true + end + # Initializes and connects a PostgreSQL adapter. def initialize(connection, logger, connection_parameters, config) super(connection, logger) @@ -224,11 +226,19 @@ module ActiveRecord @local_tz = nil @table_alias_length = nil @postgresql_version = nil + @statements = {} connect @local_tz = execute('SHOW TIME ZONE').first["TimeZone"] end + def clear_cache! + @statements.each_value do |value| + @connection.query "DEALLOCATE #{value}" + end + @statements.clear + end + # Is this connection alive and ready for queries? def active? if @connection.respond_to?(:status) @@ -246,6 +256,7 @@ module ActiveRecord # Close then reopen the connection. def reconnect! if @connection.respond_to?(:reset) + clear_cache! @connection.reset configure_connection else @@ -254,8 +265,14 @@ module ActiveRecord end end + def reset! + clear_cache! + super + end + # Close the connection. def disconnect! + clear_cache! @connection.close rescue nil end @@ -317,19 +334,22 @@ module ActiveRecord def quote(value, column = nil) #:nodoc: return super unless column - if value.kind_of?(String) && column.type == :binary - "'#{escape_bytea(value)}'" - elsif value.kind_of?(String) && column.sql_type == 'xml' - "xml '#{quote_string(value)}'" - elsif value.kind_of?(Numeric) && column.sql_type == 'money' + case value + when Numeric + return super unless column.sql_type == 'money' # Not truly string input, so doesn't require (or allow) escape string syntax. "'#{value}'" - elsif value.kind_of?(String) && column.sql_type =~ /^bit/ - case value - when /^[01]*$/ - "B'#{value}'" # Bit-string notation - when /^[0-9A-F]*$/i - "X'#{value}'" # Hexadecimal notation + when String + case column.sql_type + when 'bytea' then "'#{escape_bytea(value)}'" + when 'xml' then "xml '#{quote_string(value)}'" + when /^bit/ + case value + when /^[01]*$/ then "B'#{value}'" # Bit-string notation + when /^[0-9A-F]*$/i then "X'#{value}'" # Hexadecimal notation + end + else + super end else super @@ -375,13 +395,16 @@ module ActiveRecord end end + # Set the authorized user for this session + def session_auth=(user) + clear_cache! + exec_query "SET SESSION AUTHORIZATION #{user}" + end + # REFERENTIAL INTEGRITY ==================================== def supports_disable_referential_integrity?() #:nodoc: - version = query("SHOW server_version")[0][0].split('.') - version[0].to_i >= 8 && version[1].to_i >= 1 - rescue - return false + postgresql_version >= 80100 end def disable_referential_integrity #:nodoc: @@ -430,7 +453,7 @@ module ActiveRecord # If a pk is given, fallback to default sequence name. # Don't fetch last insert id for a table without a pk. if pk && sequence_name ||= default_sequence_name(table, pk) - last_insert_id(table, sequence_name) + last_insert_id(sequence_name) end end end @@ -466,8 +489,8 @@ module ActiveRecord # (2) $12.345.678,12 case data when /^-?\D+[\d,]+\.\d{2}$/ # (1) - data.gsub!(/[^-\d\.]/, '') - when /^-?\D+[\d\.]+,\d{2}$/ # (2) + data.gsub!(/[^-\d.]/, '') + when /^-?\D+[\d.]+,\d{2}$/ # (2) data.gsub!(/[^-\d,]/, '').sub!(/,/, '.') end end @@ -502,6 +525,35 @@ module ActiveRecord end end + def substitute_for(column, current_values) + Arel.sql("$#{current_values.length + 1}") + end + + def exec_query(sql, name = 'SQL', binds = []) + return exec_no_cache(sql, name) if binds.empty? + + log(sql, name, binds) do + unless @statements.key? sql + nextkey = "a#{@statements.length + 1}" + @connection.prepare nextkey, sql + @statements[sql] = nextkey + end + + key = @statements[sql] + + # Clear the queue + @connection.get_last_result + @connection.send_query_prepared(key, binds.map { |col, val| + col ? col.type_cast(val) : val + }) + @connection.block + result = @connection.get_last_result + ret = ActiveRecord::Result.new(result.fields, result_as_array(result)) + result.clear + return ret + end + end + # Executes an UPDATE query and returns the number of affected tuples. def update_sql(sql, name = nil) super.cmd_tuples @@ -659,8 +711,8 @@ module ActiveRecord # Returns the list of all column definitions for a table. def columns(table_name, name = nil) # Limit, precision, and scale are all handled by the superclass. - column_definitions(table_name).collect do |name, type, default, notnull| - PostgreSQLColumn.new(name, default, type, notnull == 'f') + column_definitions(table_name).collect do |column_name, type, default, notnull| + PostgreSQLColumn.new(column_name, default, type, notnull == 'f') end end @@ -734,7 +786,7 @@ module ActiveRecord def pk_and_sequence_for(table) #:nodoc: # First try looking for a sequence with a dependency on the # given table's primary key. - result = query(<<-end_sql, 'PK and serial sequence')[0] + result = exec_query(<<-end_sql, 'PK and serial sequence').rows.first SELECT attr.attname, seq.relname FROM pg_class seq, pg_attribute attr, @@ -793,14 +845,18 @@ module ActiveRecord # Adds a new column to the named table. # See TableDefinition#column for details of the options you can use. def add_column(table_name, column_name, type, options = {}) - default = options[:default] - notnull = options[:null] == false + add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}" + add_column_options!(add_column_sql, options) - # Add the column. - execute("ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}") + begin + execute add_column_sql + rescue ActiveRecord::StatementInvalid => e + raise e if postgresql_version > 80000 - change_column_default(table_name, column_name, default) if options_include_default?(options) - change_column_null(table_name, column_name, false, default) if notnull + execute("ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}") + change_column_default(table_name, column_name, options[:default]) if options_include_default?(options) + change_column_null(table_name, column_name, options[:null], options[:default]) if options.key?(:null) + end end # Changes the column of a table. @@ -850,6 +906,10 @@ module ActiveRecord execute "DROP INDEX #{quote_table_name(index_name)}" end + def rename_index(table_name, old_name, new_name) + execute "ALTER INDEX #{quote_column_name(old_name)} RENAME TO #{quote_table_name(new_name)}" + end + def index_name_length 63 end @@ -873,13 +933,13 @@ module ActiveRecord # requires that the ORDER BY include the distinct column. # # distinct("posts.id", "posts.created_at desc") - def distinct(columns, order_by) #:nodoc: - return "DISTINCT #{columns}" if order_by.blank? + def distinct(columns, orders) #:nodoc: + return "DISTINCT #{columns}" if orders.empty? # Construct a clean list of column names from the ORDER BY clause, removing # any ASC/DESC modifiers - order_columns = order_by.split(',').collect { |s| s.split.first } - order_columns.delete_if(&:blank?) + order_columns = orders.collect { |s| s =~ /^(.+)\s+(ASC|DESC)\s*$/i ? $1 : s } + order_columns.delete_if { |c| c.blank? } order_columns = order_columns.zip((0...order_columns.size).to_a).map { |s,i| "#{s} AS alias_#{i}" } # Return a DISTINCT ON() clause that's distinct on the columns we want but includes @@ -897,8 +957,12 @@ module ActiveRecord else # Mimic PGconn.server_version behavior begin - query('SELECT version()')[0][0] =~ /PostgreSQL (\d+)\.(\d+)\.(\d+)/ - ($1.to_i * 10000) + ($2.to_i * 100) + $3.to_i + if query('SELECT version()')[0][0] =~ /PostgreSQL ([0-9.]+)/ + major, minor, tiny = $1.split(".") + (major.to_i * 10000) + (minor.to_i * 100) + tiny.to_i + else + 0 + end rescue 0 end @@ -917,6 +981,15 @@ module ActiveRecord end private + def exec_no_cache(sql, name) + log(sql, name) do + result = @connection.async_exec(sql) + ret = ActiveRecord::Result.new(result.fields, result_as_array(result)) + result.clear + ret + end + end + # The internal PostgreSQL identifier of the money data type. MONEY_COLUMN_TYPE_OID = 790 #:nodoc: # The internal PostgreSQL identifier of the BYTEA data type. @@ -929,7 +1002,7 @@ module ActiveRecord PGconn.translate_results = false if PGconn.respond_to?(:translate_results=) # Ignore async_exec and async_query when using postgres-pr. - @async = @config[:allow_concurrency] && @connection.respond_to?(:async_exec) + @async = @connection.respond_to?(:async_exec) # Money type has a fixed precision of 10 in PostgreSQL 8.2 and below, and as of # PostgreSQL 8.3 it has a fixed precision of 19. PostgreSQLColumn.extract_precision @@ -965,17 +1038,15 @@ module ActiveRecord end # Returns the current ID of a table's sequence. - def last_insert_id(table, sequence_name) #:nodoc: - Integer(select_value("SELECT currval('#{sequence_name}')")) + def last_insert_id(sequence_name) #:nodoc: + r = exec_query("SELECT currval($1)", 'SQL', [[nil, sequence_name]]) + Integer(r.rows.first.first) end # Executes a SELECT query and returns the results, performing any data type # conversions that are required to be performed here instead of in PostgreSQLColumn. - def select(sql, name = nil) - fields, rows = select_raw(sql, name) - rows.map do |row| - Hash[*fields.zip(row).flatten] - end + def select(sql, name = nil, binds = []) + exec_query(sql, name, binds).to_a end def select_raw(sql, name = nil) @@ -1005,7 +1076,7 @@ module ActiveRecord # - format_type includes the column size constraint, e.g. varchar(50) # - ::regclass is a function that gives the id for a table name def column_definitions(table_name) #:nodoc: - query <<-end_sql + exec_query(<<-end_sql).rows SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum @@ -1016,14 +1087,18 @@ module ActiveRecord end def extract_pg_identifier_from_name(name) - match_data = name[0,1] == '"' ? name.match(/\"([^\"]+)\"/) : name.match(/([^\.]+)/) + match_data = name.start_with?('"') ? name.match(/\"([^\"]+)\"/) : name.match(/([^\.]+)/) if match_data - rest = name[match_data[0].length..-1] - rest = rest[1..-1] if rest[0,1] == "." + rest = name[match_data[0].length, name.length] + rest = rest[1, rest.length] if rest.start_with? "." [match_data[1], (rest.length > 0 ? rest : nil)] end end + + def table_definition + TableDefinition.new(self) + end end end end |