From 5b95730edc33ee97f53da26a3868eb983305a771 Mon Sep 17 00:00:00 2001 From: Emili Parreno Date: Sat, 8 May 2010 12:35:39 +0100 Subject: Add index length support for MySQL [#1852 state:resolved] Example: add_index(:accounts, :name, :name => 'by_name', :length => 10) => CREATE INDEX by_name ON accounts(name(10)) add_index(:accounts, [:name, :surname], :name => 'by_name_surname', :length => {:name => 10, :surname => 15}) => CREATE INDEX by_name_surname ON accounts(name(10), surname(15)) Signed-off-by: Pratik Naik --- .../abstract/schema_definitions.rb | 2 +- .../abstract/schema_statements.rb | 23 +++++++++++++++++++++- .../connection_adapters/mysql_adapter.rb | 15 +++++++++++++- activerecord/lib/active_record/schema_dumper.rb | 1 + 4 files changed, 38 insertions(+), 3 deletions(-) (limited to 'activerecord/lib/active_record') diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb index 6c477e48ce..e42cd99786 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb @@ -258,7 +258,7 @@ module ActiveRecord end end - class IndexDefinition < Struct.new(:table, :name, :unique, :columns) #:nodoc: + class IndexDefinition < Struct.new(:table, :name, :unique, :columns, :lengths) #:nodoc: end # Abstract representation of a column definition. Instances of this type diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb index e8cba1bd41..1255ef09be 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb @@ -256,18 +256,32 @@ module ActiveRecord # name. # # ===== Examples + # # ====== Creating a simple index # add_index(:suppliers, :name) # generates # CREATE INDEX suppliers_name_index ON suppliers(name) + # # ====== Creating a unique index # add_index(:accounts, [:branch_id, :party_id], :unique => true) # generates # CREATE UNIQUE INDEX accounts_branch_id_party_id_index ON accounts(branch_id, party_id) + # # ====== Creating a named index # add_index(:accounts, [:branch_id, :party_id], :unique => true, :name => 'by_branch_party') # generates # CREATE UNIQUE INDEX by_branch_party ON accounts(branch_id, party_id) + # + # ====== Creating an index with specific key length + # add_index(:accounts, :name, :name => 'by_name', :length => 10) + # generates + # CREATE INDEX by_name ON accounts(name(10)) + # + # add_index(:accounts, [:name, :surname], :name => 'by_name_surname', :length => {:name => 10, :surname => 15}) + # generates + # CREATE INDEX by_name_surname ON accounts(name(10), surname(15)) + # + # Note: SQLite doesn't support index length def add_index(table_name, column_name, options = {}) column_names = Array.wrap(column_name) index_name = index_name(table_name, :column => column_names) @@ -278,7 +292,9 @@ module ActiveRecord else index_type = options end - quoted_column_names = column_names.map { |e| quote_column_name(e) }.join(", ") + + quoted_column_names = quoted_columns_for_index(column_names, options).join(", ") + execute "CREATE #{index_type} INDEX #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} (#{quoted_column_names})" end @@ -430,6 +446,11 @@ module ActiveRecord end protected + # Overridden by the mysql adapter for supporting index lengths + def quoted_columns_for_index(column_names, options = {}) + column_names.map {|name| quote_column_name(name) } + end + def options_include_default?(options) options.include?(:default) && !(options[:null] == false && options[:default].nil?) end diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb index 55d9d20bb5..470ff8d767 100644 --- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb @@ -461,10 +461,11 @@ module ActiveRecord if current_index != row[2] next if row[2] == "PRIMARY" # skip the primary key current_index = row[2] - indexes << IndexDefinition.new(row[0], row[2], row[1] == "0", []) + indexes << IndexDefinition.new(row[0], row[2], row[1] == "0", [], []) end indexes.last.columns << row[4] + indexes.last.lengths << row[7] end result.free indexes @@ -594,6 +595,18 @@ module ActiveRecord end protected + def quoted_columns_for_index(column_names, options = {}) + length = options[:length] if options.is_a?(Hash) + + quoted_column_names = case length + when Hash + column_names.map {|name| length[name] ? "#{quote_column_name(name)}(#{length[name]})" : quote_column_name(name) } + when Fixnum + column_names.map {|name| "#{quote_column_name(name)}(#{length})"} + else + column_names.map {|name| quote_column_name(name) } + end + end def translate_exception(exception, message) return super unless exception.respond_to?(:errno) diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb index c8e1b4f53a..5cb639a300 100644 --- a/activerecord/lib/active_record/schema_dumper.rb +++ b/activerecord/lib/active_record/schema_dumper.rb @@ -177,6 +177,7 @@ HEADER statment_parts << index.columns.inspect statment_parts << (':name => ' + index.name.inspect) statment_parts << ':unique => true' if index.unique + statment_parts << (':length => ' + Hash[*index.columns.zip(index.lengths).flatten].inspect) if index.lengths.compact.present? ' ' + statment_parts.join(', ') end -- cgit v1.2.3