diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters')
-rw-r--r-- | activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb | 13 |
1 files changed, 2 insertions, 11 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 e26b10fa97..f72d2974c8 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb @@ -576,17 +576,8 @@ module ActiveRecord # Returns a table's primary key and belonging sequence. def pk_and_sequence_for(table) - sql = <<-SQL - SELECT t.constraint_type, k.column_name - FROM information_schema.table_constraints t - JOIN information_schema.key_column_usage k - USING (constraint_name, table_schema, table_name) - WHERE t.table_schema = DATABASE() - AND t.table_name = '#{table}' - SQL - - execute_and_free(sql, 'SCHEMA') do |result| - keys = each_hash(result).select { |row| row[:constraint_type] == 'PRIMARY KEY' }.map { |row| row[:column_name] } + 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 end end |