diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb')
-rw-r--r-- | activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb new file mode 100644 index 0000000000..4118ea7b31 --- /dev/null +++ b/activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb @@ -0,0 +1,57 @@ +module ActiveRecord + module ConnectionAdapters # :nodoc: + module DatabaseLimits + + # the maximum length of a table alias + def table_alias_length + 255 + end + + # the maximum length of a column name + def column_name_length + 64 + end + + # the maximum length of a table name + def table_name_length + 64 + end + + # the maximum length of an index name + def index_name_length + 64 + end + + # the maximum number of columns per table + def columns_per_table + 1024 + end + + # the maximum number of indexes per table + def indexes_per_table + 16 + end + + # the maximum number of columns in a multicolumn index + def columns_per_multicolumn_index + 16 + end + + # the maximum number of elements in an IN (x,y,z) clause + def in_clause_length + 65535 + end + + # the maximum length of a SQL query + def sql_query_length + 1048575 + end + + # maximum number of joins in a single query + def joins_per_query + 256 + end + + end + end +end |