# Index of values

C
conndefaults [Postgresql] | `conndefaults ()`
F
ftype_of_oid [Postgresql] | `ftype_of_oid oid` converts `oid` to an `ftype`.
ftype_of_string [Postgresql] | `string_of_ftype ftype` converts `ftype` to a string.
I
invalid_oid [Postgresql] | `invalid_oid` invalid Oid.
N
null [Postgresql] | `null` can be used as an element of the optional argument `parameters` passed to the `exec` or `send_query` method to indicate a NULL value.
O
oid_of_ftype [Postgresql] | `oid_of_ftype ftype` converts `ftype` to an `oid`.
R
result_status [Postgresql] | `result_status stat` convert status `stat` to a human-readable message
S
string_of_error [Postgresql] | `string_of_error error` convert `error` to a human-readable message
string_of_ftype [Postgresql] | `string_of_ftype ftype` converts `ftype` to a string.
U
unescape_bytea [Postgresql] | `unescape_bytea str` unescapes binary string `str`.