Merge remote-tracking branch 'upstream/master' into desc_tracker

1 files changed, 16 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index 368c5b2023..e1186209d3 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -504,14 +504,28 @@ module ActiveRecord
         show_variable 'collation_database'
       end
 
-      def tables(name = nil) #:nodoc:
+      def tables(name = nil, database = nil) #:nodoc:
         tables = []
-        result = execute("SHOW TABLES", name)
+        result = execute(["SHOW TABLES", database].compact.join(' IN '), name)
         result.each { |field| tables << field[0] }
         result.free
         tables
       end
 
+      def table_exists?(name)
+        return true if super
+
+        name          = name.to_s
+        schema, table = name.split('.', 2)
+
+        unless table # A table was provided without a schema
+          table  = schema
+          schema = nil
+        end
+
+        tables(nil, schema).include? table
+      end
+
       def drop_table(table_name, options = {})
         super(table_name, options)
       end