pg_pltemplate

PostgreSQL 9.6.17 Documentation
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# 50.36. `pg_pltemplate`

The catalog `pg_pltemplate` stores "template" information for procedural languages. A template for a language allows the language to be created in a particular database by a simple `CREATE LANGUAGE` command, with no need to specify implementation details.

Unlike most system catalogs, `pg_pltemplate` is shared across all databases of a cluster: there is only one copy of `pg_pltemplate` per cluster, not one per database. This allows the information to be accessible in each database as it is needed.

Table 50-36. `pg_pltemplate` Columns

Name | Type | Description
--- | --- | ---
`tmplname` | `name` | Name of the language this template is for
`tmpltrusted` | `boolean` | True if language is considered trusted
`tmpldbacreate` | `boolean` | True if language may be created by a database owner
`tmplhandler` | `text` | Name of call handler function
`tmplinline` | `text` | Name of anonymous-block handler function, or null if none
`tmplvalidator` | `text` | Name of validator function, or null if none
`tmpllibrary` | `text` | Path of shared library that implements language
`tmplacl` | `aclitem[]` | Access privileges for template (not actually used)

There are not currently any commands that manipulate procedural language templates; to change the built-in information, a superuser must modify the table using ordinary `INSERT`, `DELETE`, or `UPDATE` commands.

> Note: It is likely that `pg_pltemplate` will be removed in some future release of PostgreSQL, in favor of keeping this knowledge about procedural languages in their respective extension installation scripts.

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