The catalog pg_language registers
languages in which you can write functions or stored procedures.
See CREATE LANGUAGE
and Chapter 36 for more information about language handlers.
Table 43-20. pg_language Columns
|lanname||name|| ||Name of the language|
|lanispl||bool|| || This is false for internal languages (such as
SQL) and true for user-defined languages.
Currently, pg_dump still uses this
to determine which languages need to be dumped, but this may be
replaced by a different mechanism in the future
|lanpltrusted||bool|| || True if this is a trusted language, which means that it is believed
not to grant access to anything outside the normal SQL execution
environment. Only superusers may create functions in untrusted
|lanplcallfoid||oid||pg_proc.oid|| For noninternal languages this references the language
handler, which is a special function that is responsible for
executing all functions that are written in the particular
|lanvalidator||oid||pg_proc.oid|| This references a language validator function that is responsible
for checking the syntax and validity of new functions when they
are created. Zero if no validator is provided
|lanacl||aclitem|| || Access privileges; see