52.62. pg_ts

52.62. `pg_ts_parser`
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52.62. `pg_ts_parser` #

The pg_ts_parser catalog contains entries defining text search parsers. A parser is responsible for splitting input text into lexemes and assigning a token type to each lexeme. Since a parser must be implemented by C-language-level functions, creation of new parsers is restricted to database superusers.

PostgreSQL's text search features are described at length in Chapter 12.

Table 52.62. \1 字段列说明

Column Type Description
`oid` `oid` Row identifier
`prsname` `name` Text search parser name
`prsnamespace` `oid` (references `pg_namespace`.`oid`) The OID of the namespace that contains this parser
`prsstart` `regproc` (references `pg_proc`.`oid`) OID of the parser's startup function
`prstoken` `regproc` (references `pg_proc`.`oid`) OID of the parser's next-token function
`prsend` `regproc` (references `pg_proc`.`oid`) OID of the parser's shutdown function
`prsheadline` `regproc` (references `pg_proc`.`oid`) OID of the parser's headline function (zero if none)
`prslextype` `regproc` (references `pg_proc`.`oid`) OID of the parser's lextype function

Column Type

Description

oid oid

Row identifier

prsname name

Text search parser name

prsnamespace oid (references pg_namespace.oid)

The OID of the namespace that contains this parser

prsstart regproc (references pg_proc.oid)

OID of the parser's startup function

prstoken regproc (references pg_proc.oid)

OID of the parser's next-token function

prsend regproc (references pg_proc.oid)

OID of the parser's shutdown function

prsheadline regproc (references pg_proc.oid)

OID of the parser's headline function (zero if none)

prslextype regproc (references pg_proc.oid)

OID of the parser's lextype function

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52.62. pg_ts_parser #

52.62. `pg_ts_parser` #