diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb')
| -rw-r--r-- | activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb | 169 |
1 files changed, 63 insertions, 106 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb index f143fd348e..a848838a4e 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb @@ -1,4 +1,5 @@ require 'active_support/core_ext/object/blank' +require 'arel/visitors/bind_visitor' module ActiveRecord module ConnectionAdapters @@ -122,12 +123,21 @@ module ActiveRecord :boolean => { :name => "tinyint", :limit => 1 } } + class BindSubstitution < Arel::Visitors::MySQL # :nodoc: + include Arel::Visitors::BindVisitor + end + # FIXME: Make the first parameter more similar for the two adapters def initialize(connection, logger, connection_options, config) super(connection, logger) @connection_options, @config = connection_options, config @quoted_column_names, @quoted_table_names = {}, {} - @visitor = Arel::Visitors::MySQL.new self + + if config.fetch(:prepared_statements) { true } + @visitor = Arel::Visitors::MySQL.new self + else + @visitor = BindSubstitution.new self + end end def adapter_name #:nodoc: @@ -152,7 +162,7 @@ module ActiveRecord true end - # Technically MySQL allows to create indexes with the sort order syntax + # Technically MySQL allows to create indexes with the sort order syntax # but at the moment (5.5) it doesn't yet implement them def supports_index_sort_order? true @@ -225,80 +235,6 @@ module ActiveRecord # DATABASE STATEMENTS ====================================== - def explain(arel) - sql = "EXPLAIN #{to_sql(arel)}" - start = Time.now - result = exec_query(sql, 'EXPLAIN') - elapsed = Time.now - start - - ExplainPrettyPrinter.new.pp(result, elapsed) - end - - class ExplainPrettyPrinter # :nodoc: - # Pretty prints the result of a EXPLAIN in a way that resembles the output of the - # MySQL shell: - # - # +----+-------------+-------+-------+---------------+---------+---------+-------+------+-------------+ - # | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | - # +----+-------------+-------+-------+---------------+---------+---------+-------+------+-------------+ - # | 1 | SIMPLE | users | const | PRIMARY | PRIMARY | 4 | const | 1 | | - # | 1 | SIMPLE | posts | ALL | NULL | NULL | NULL | NULL | 1 | Using where | - # +----+-------------+-------+-------+---------------+---------+---------+-------+------+-------------+ - # 2 rows in set (0.00 sec) - # - # This is an exercise in Ruby hyperrealism :). - def pp(result, elapsed) - widths = compute_column_widths(result) - separator = build_separator(widths) - - pp = [] - - pp << separator - pp << build_cells(result.columns, widths) - pp << separator - - result.rows.each do |row| - pp << build_cells(row, widths) - end - - pp << separator - pp << build_footer(result.rows.length, elapsed) - - pp.join("\n") + "\n" - end - - private - - def compute_column_widths(result) - [].tap do |widths| - result.columns.each_with_index do |column, i| - cells_in_column = [column] + result.rows.map {|r| r[i].nil? ? 'NULL' : r[i].to_s} - widths << cells_in_column.map(&:length).max - end - end - end - - def build_separator(widths) - padding = 1 - '+' + widths.map {|w| '-' * (w + (padding*2))}.join('+') + '+' - end - - def build_cells(items, widths) - cells = [] - items.each_with_index do |item, i| - item = 'NULL' if item.nil? - justifier = item.is_a?(Numeric) ? 'rjust' : 'ljust' - cells << item.to_s.send(justifier, widths[i]) - end - '| ' + cells.join(' | ') + ' |' - end - - def build_footer(nrows, elapsed) - rows_label = nrows == 1 ? 'row' : 'rows' - "#{nrows} #{rows_label} in set (%.2f sec)" % elapsed - end - end - # Executes the SQL statement in the context of this connection. def execute(sql, name = nil) if name == :skip_logging @@ -358,19 +294,10 @@ module ActiveRecord # In the simple case, MySQL allows us to place JOINs directly into the UPDATE # query. However, this does not allow for LIMIT, OFFSET and ORDER. To support - # these, we must use a subquery. However, MySQL is too stupid to create a - # temporary table for this automatically, so we have to give it some prompting - # in the form of a subsubquery. Ugh! + # these, we must use a subquery. def join_to_update(update, select) #:nodoc: if select.limit || select.offset || select.orders.any? - subsubselect = select.clone - subsubselect.projections = [update.key] - - subselect = Arel::SelectManager.new(select.engine) - subselect.project Arel.sql(update.key.name) - subselect.from subsubselect.as('__active_record_temp') - - update.where update.key.in(subselect) + super else update.table select.source update.wheres = select.constraints @@ -437,8 +364,10 @@ module ActiveRecord show_variable 'collation_database' end - def tables(name = nil, database = nil) #:nodoc: - sql = ["SHOW TABLES", database].compact.join(' IN ') + def tables(name = nil, database = nil, like = nil) #:nodoc: + sql = "SHOW TABLES " + sql << "IN #{quote_table_name(database)} " if database + sql << "LIKE #{quote(like)}" if like execute_and_free(sql, 'SCHEMA') do |result| result.collect { |field| field.first } @@ -446,7 +375,8 @@ module ActiveRecord end def table_exists?(name) - return true if super + return false unless name + return true if tables(nil, nil, name).any? name = name.to_s schema, table = name.split('.', 2) @@ -456,7 +386,7 @@ module ActiveRecord schema = nil end - tables(nil, schema).include? table + tables(nil, schema, table).any? end # Returns an array of indexes for the given table. @@ -480,7 +410,7 @@ module ActiveRecord end # Returns an array of +Column+ objects for the table specified by +table_name+. - def columns(table_name, name = nil)#:nodoc: + def columns(table_name)#:nodoc: sql = "SHOW FULL FIELDS FROM #{quote_table_name(table_name)}" execute_and_free(sql, 'SCHEMA') do |result| each_hash(result).map do |field| @@ -498,7 +428,7 @@ module ActiveRecord table, arguments = args.shift, args method = :"#{command}_sql" - if respond_to?(method) + if respond_to?(method, true) send(method, table, *arguments) else raise "Unknown method called : #{method}(#{arguments.inspect})" @@ -545,15 +475,26 @@ module ActiveRecord # Maps logical Rails types to MySQL-specific data types. def type_to_sql(type, limit = nil, precision = nil, scale = nil) - return super unless type.to_s == 'integer' - - case limit - when 1; 'tinyint' - when 2; 'smallint' - when 3; 'mediumint' - when nil, 4, 11; 'int(11)' # compatibility with MySQL default - when 5..8; 'bigint' - else raise(ActiveRecordError, "No integer type has byte size #{limit}") + case type.to_s + when 'integer' + case limit + when 1; 'tinyint' + when 2; 'smallint' + when 3; 'mediumint' + when nil, 4, 11; 'int(11)' # compatibility with MySQL default + when 5..8; 'bigint' + else raise(ActiveRecordError, "No integer type has byte size #{limit}") + end + when 'text' + case limit + when 0..0xff; 'tinytext' + when nil, 0x100..0xffff; 'text' + when 0x10000..0xffffff; 'mediumtext' + when 0x1000000..0xffffffff; 'longtext' + else raise(ActiveRecordError, "No text type has character length #{limit}") + end + else + super end end @@ -573,9 +514,14 @@ module ActiveRecord # Returns a table's primary key and belonging sequence. def pk_and_sequence_for(table) - execute_and_free("SHOW INDEX FROM #{quote_table_name(table)} WHERE Key_name = 'PRIMARY'", 'SCHEMA') do |result| - keys = each_hash(result).map { |row| row[:Column_name] } - keys.length == 1 ? [keys.first, nil] : nil + execute_and_free("SHOW CREATE TABLE #{quote_table_name(table)}", 'SCHEMA') do |result| + create_table = each_hash(result).first[:"Create Table"] + if create_table.to_s =~ /PRIMARY KEY\s+(?:USING\s+\w+\s+)?\((.+)\)/ + keys = $1.split(",").map { |key| key.delete('`"') } + keys.length == 1 ? [keys.first, nil] : nil + else + nil + end end end @@ -603,11 +549,22 @@ module ActiveRecord protected + # MySQL is too stupid to create a temporary table for use subquery, so we have + # to give it some prompting in the form of a subsubquery. Ugh! + def subquery_for(key, select) + subsubselect = select.clone + subsubselect.projections = [key] + + subselect = Arel::SelectManager.new(select.engine) + subselect.project Arel.sql(key.name) + subselect.from subsubselect.as('__active_record_temp') + end + def add_index_length(option_strings, column_names, options = {}) if options.is_a?(Hash) && length = options[:length] case length when Hash - column_names.each {|name| option_strings[name] += "(#{length[name]})" if length.has_key?(name)} + column_names.each {|name| option_strings[name] += "(#{length[name]})" if length.has_key?(name) && length[name].present?} when Fixnum column_names.each {|name| option_strings[name] += "(#{length})"} end |