Added missing docs for clear_cache! on adapters

3 files changed, 3 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index e01419224b..3318075e9e 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -332,6 +332,7 @@ module ActiveRecord
         rows
       end
 
+      # Clear prepared statement cache.
       def clear_cache!
         @statements.values.each do |cache|
           cache[:stmt].close
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 94cf8d45d6..ba7852192e 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -237,6 +237,7 @@ module ActiveRecord
         @local_tz = execute('SHOW TIME ZONE', 'SCHEMA').first["TimeZone"]
       end
 
+      # Clear prepared statement cache.
       def clear_cache!
         @statements.each_value do |value|
           @connection.query "DEALLOCATE #{value}"
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
index 5d2ebff9a7..326f22ce82 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -96,6 +96,7 @@ module ActiveRecord
         @connection.close rescue nil
       end
 
+      # Clear prepared statement cache.
       def clear_cache!
         @statements.clear
       end