Added connection#current_database that'll return of the current database (only works in MySQL, SQL Server, and Oracle so far -- please help implement for the rest of the adapters) (closes #3663) [Tom ward]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3911 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Added connection#current_database that'll return of the current database (only works in MySQL, SQL Server, and Oracle so far -- please help implement for the rest of the adapters) #3663 [Tom ward]
+
 * Fixed that Migration#execute would have the table name prefix appended to its query #4110 [mark.imbriaco@pobox.com]
 
 * Make all tinyint(1) variants act like boolean in mysql (tinyint(1) unsigned, etc.) [Jamis Buck]

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -261,6 +261,9 @@ module ActiveRecord
         execute "DROP DATABASE IF EXISTS `#{name}`"
       end
 
+      def current_database
+        select_one("SELECT DATABASE() as db")["db"]
+      end
 
       def tables(name = nil) #:nodoc:
         tables = []

activerecord/lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -399,6 +399,10 @@ module ActiveRecord
       def create_database(name)
         execute "CREATE DATABASE #{name}"
       end
+   
+      def current_database
+        @connection.select_one("select DB_NAME()")[0]
+      end
 
       def tables(name = nil)
         execute("SELECT table_name from information_schema.tables WHERE table_type = 'BASE TABLE'", name).inject([]) do |tables, field|

activerecord/test/adapter_test.rb

@@ -18,8 +18,9 @@ class AdapterTest < Test::Unit::TestCase
   end
 
   def test_indexes
+    idx_name = "accounts_idx"
+      
     if @connection.respond_to?(:indexes)
-      idx_name = "accounts_idx"
       indexes = @connection.indexes("accounts")
       assert indexes.empty?
 
@@ -34,7 +35,15 @@ class AdapterTest < Test::Unit::TestCase
     end
 
   ensure
-    @connection.remove_index :accounts, :firm_id rescue nil
+    @connection.remove_index(:accounts, :name => idx_name) rescue nil
+  end
+  
+  def test_current_database
+    if @connection.respond_to?(:current_database)
+      assert_equal "activerecord_unittest", @connection.current_database
+    else
+      warn "#{@connection.class} does not respond to #current_database"
+    end
   end
 
   # test resetting sequences in odd tables in postgreSQL