diff --git a/django/db/backends/__init__.py b/django/db/backends/__init__.py
index f740bef3bb..8113f6f877 100644
--- a/django/db/backends/__init__.py
+++ b/django/db/backends/__init__.py
@@ -91,3 +91,11 @@ class BaseDatabaseOperations(object):
         Returns the SQL command that drops a foreign key.
         """
         return "DROP CONSTRAINT"
+
+    def fulltext_search_sql(self, field_name):
+        """
+        Returns the SQL WHERE clause to use in order to perform a full-text
+        search of the given field_name. Note that the resulting string should
+        contain a '%s' placeholder for the value being searched against.
+        """
+        raise NotImplementedError('Full-text search is not implemented for this database backend')
diff --git a/django/db/backends/ado_mssql/base.py b/django/db/backends/ado_mssql/base.py
index 56dd944dcd..6c9b50bd4b 100644
--- a/django/db/backends/ado_mssql/base.py
+++ b/django/db/backends/ado_mssql/base.py
@@ -110,9 +110,6 @@ def get_limit_offset_sql(limit, offset=None):
 def get_random_function_sql():
     return "RAND()"
 
-def get_fulltext_search_sql(field_name):
-    raise NotImplementedError
-
 def get_pk_default_value():
     return "DEFAULT"
 
diff --git a/django/db/backends/dummy/base.py b/django/db/backends/dummy/base.py
index e9488540d6..9e49840f9e 100644
--- a/django/db/backends/dummy/base.py
+++ b/django/db/backends/dummy/base.py
@@ -46,7 +46,6 @@ dictfetchall = complain
 get_last_insert_id = complain
 get_limit_offset_sql = complain
 get_random_function_sql = complain
-get_fulltext_search_sql = complain
 get_pk_default_value = complain
 get_max_name_length = ignore
 get_start_transaction_sql = complain
diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index 642d8d4272..900b995c1b 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -74,6 +74,9 @@ class DatabaseOperations(BaseDatabaseOperations):
     def drop_foreignkey_sql(self):
         return "DROP FOREIGN KEY"
 
+    def fulltext_search_sql(self, field_name):
+        return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name
+
 class DatabaseWrapper(BaseDatabaseWrapper):
     ops = DatabaseOperations()
 
@@ -164,9 +167,6 @@ def get_limit_offset_sql(limit, offset=None):
 def get_random_function_sql():
     return "RAND()"
 
-def get_fulltext_search_sql(field_name):
-    return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name
-
 def get_pk_default_value():
     return "DEFAULT"
 
diff --git a/django/db/backends/mysql_old/base.py b/django/db/backends/mysql_old/base.py
index 558475e02f..519670ad74 100644
--- a/django/db/backends/mysql_old/base.py
+++ b/django/db/backends/mysql_old/base.py
@@ -84,6 +84,9 @@ class DatabaseOperations(BaseDatabaseOperations):
     def drop_foreignkey_sql(self):
         return "DROP FOREIGN KEY"
 
+    def fulltext_search_sql(self, field_name):
+        return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name
+
 class DatabaseWrapper(BaseDatabaseWrapper):
     ops = DatabaseOperations()
 
@@ -183,9 +186,6 @@ def get_limit_offset_sql(limit, offset=None):
 def get_random_function_sql():
     return "RAND()"
 
-def get_fulltext_search_sql(field_name):
-    return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name
-
 def get_pk_default_value():
     return "DEFAULT"
 
diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index 318e0cf03e..28b798fa2d 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -186,9 +186,6 @@ def get_limit_offset_sql(limit, offset=None):
 def get_random_function_sql():
     return "DBMS_RANDOM.RANDOM"
 
-def get_fulltext_search_sql(field_name):
-    raise NotImplementedError
-
 def get_pk_default_value():
     return "DEFAULT"
 
diff --git a/django/db/backends/postgresql/base.py b/django/db/backends/postgresql/base.py
index b51501f570..cb83200776 100644
--- a/django/db/backends/postgresql/base.py
+++ b/django/db/backends/postgresql/base.py
@@ -140,9 +140,6 @@ def get_limit_offset_sql(limit, offset=None):
 def get_random_function_sql():
     return "RANDOM()"
 
-def get_fulltext_search_sql(field_name):
-    raise NotImplementedError
-
 def get_pk_default_value():
     return "DEFAULT"
 
diff --git a/django/db/backends/postgresql_psycopg2/base.py b/django/db/backends/postgresql_psycopg2/base.py
index e7bf84d4f4..d60210b772 100644
--- a/django/db/backends/postgresql_psycopg2/base.py
+++ b/django/db/backends/postgresql_psycopg2/base.py
@@ -94,9 +94,6 @@ def get_limit_offset_sql(limit, offset=None):
 def get_random_function_sql():
     return "RANDOM()"
 
-def get_fulltext_search_sql(field_name):
-    raise NotImplementedError
-
 def get_pk_default_value():
     return "DEFAULT"
 
diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index 75b5f55077..51ef11d346 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -127,9 +127,6 @@ def get_limit_offset_sql(limit, offset=None):
 def get_random_function_sql():
     return "RANDOM()"
 
-def get_fulltext_search_sql(field_name):
-    raise NotImplementedError
-
 def get_pk_default_value():
     return "NULL"
 
diff --git a/django/db/models/query.py b/django/db/models/query.py
index ec56a6ce1a..faf469f1bf 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -810,7 +810,7 @@ def get_where_clause(lookup_type, table_prefix, field_name, value, db_type):
     elif lookup_type == 'isnull':
         return "%s IS %sNULL" % (field_sql, (not value and 'NOT ' or ''))
     elif lookup_type == 'search':
-        return backend.get_fulltext_search_sql(field_sql)
+        return connection.ops.fulltext_search_sql(field_sql)
     elif lookup_type in ('regex', 'iregex'):
         if settings.DATABASE_ENGINE == 'oracle':
             if lookup_type == 'regex':