adminpack provides a number of support functions which pgAdmin and other administration and management tools can use to provide additional functionality, such as remote management of server log files. Use of all these functions is restricted to superusers.
The functions shown in Table F-1 provide write access to files on the machine hosting the server. (See also the functions in Table 9-86, which provide read-only access.) Only files within the database cluster directory can be accessed, but either a relative or absolute path is allowable.
Table F-1. adminpack Functions
| Name | Return Type | Description |
|---|---|---|
pg_catalog.pg_file_write(filename text, data
text, append boolean) | bigint | Write, or append to, a text file |
pg_catalog.pg_file_rename(oldname text,
newname text [, archivename
text]) | boolean | Rename a file |
pg_catalog.pg_file_unlink(filename
text) | boolean | Remove a file |
pg_catalog.pg_logdir_ls() | setof record | List the log files in the log_directory directory |
pg_file_write writes the specified data into the file named by filename. If append is false, the file must not already exist. If append is true, the file can already exist, and will be appended to if so. Returns the number of bytes written.
pg_file_rename renames a file. If archivename is omitted or NULL, it simply renames oldname to newname (which must not already exist). If archivename is provided, it first renames newname to archivename (which must not already exist), and then renames oldname to newname. In event of failure of the second rename step, it will try to rename archivename back to newname before reporting the error. Returns true on success, false if the source file(s) are not present or not writable; other cases throw errors.
pg_file_unlink removes the specified file. Returns true on success, false if the specified file is not present or the unlink() call fails; other cases throw errors.
pg_logdir_ls returns the start timestamps and path names of all the log files in the log_directory directory. The log_filename parameter must have its default setting (postgresql-%Y-%m-%d_%H%M%S.log) to use this function.
The functions shown in Table F-2 are deprecated and should not be used in new applications; instead use those shown in Table 9-77 and Table 9-86. These functions are provided in adminpack only for compatibility with old versions of pgAdmin.
Table F-2. Deprecated adminpack Functions
| Name | Return Type | Description |
|---|---|---|
pg_catalog.pg_file_read(filename text, offset
bigint, nbytes bigint) | text | Alternate name for pg_read_file()
|
pg_catalog.pg_file_length(filename
text) | bigint | Same as size column returned by pg_stat_file()
|
pg_catalog.pg_logfile_rotate() | integer | Alternate name for pg_rotate_logfile(), but note that it returns integer 0 or 1 rather than boolean |
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