Postgresql 中文操作指南

53.57. pg_transform #

目录 pg_transform 存储关于转换的信息，它是一种将数据类型适应过程语言的机制。有关详细信息，请参阅 CREATE TRANSFORM 。

The catalog pg_transform stores information about transforms, which are a mechanism to adapt data types to procedural languages. See CREATE TRANSFORM for more information.

Table 53.57. pg_transform Columns

Column Type

Description

oid oid

Row identifier

trftype oid (references pg_type.oid)

OID of the data type this transform is for

trflang oid (references pg_language.oid)

OID of the language this transform is for

trffromsql regproc (references pg_proc.oid)

The OID of the function to use when converting the data type for input to the procedural language (e.g., function parameters). Zero is stored if the default behavior should be used.

trftosql regproc (references pg_proc.oid)

The OID of the function to use when converting output from the procedural language (e.g., return values) to the data type. Zero is stored if the default behavior should be used.