RowDescription

RowDescription is a backend protocol message. Identifies the message as a row description.

当前阅读 PG 18·选择有来源记录的版本

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此版本暂无所选语言的定义，以下显示原始英文内容。

Direction: Backend → frontend
First wire field: Byte1('T')
Field entries: 10
Documented flow contexts: Simple Query; Extended Query
direction: B
manual path: /docs/18/protocol-message-formats.html
signature: RowDescription (B)

版本定义 PG 18

Byte1('T'): Identifies the message as a row description.
Int32: Length of message contents in bytes, including self.
Int16: Specifies the number of fields in a row (can be zero).

Then, for each field, there is the following:

String: The field name.
Int32: If the field can be identified as a column of a specific table, the object ID of the table; otherwise zero.
Int16: If the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero.
Int32: The object ID of the field's data type.
Int16: The data type size (see pg_type.typlen). Note that negative values denote variable-width types.
Int32: The type modifier (see pg_attribute.atttypmod). The meaning of the modifier is type-specific.
Int16: The format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero.

Wire fields in documented order

Position	Format	Meaning
1	Byte1('T')	Identifies the message as a row description.
2	Int32	Length of message contents in bytes, including self.
3	Int16	Specifies the number of fields in a row (can be zero).
4	String	The field name.
5	Int32	If the field can be identified as a column of a specific table, the object ID of the table; otherwise zero.
6	Int16	If the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero.
7	Int32	The object ID of the field's data type.
8	Int16	The data type size (see pg_type.typlen ). Note that negative values denote variable-width types.
9	Int32	The type modifier (see pg_attribute.atttypmod ). The meaning of the modifier is type-specific.
10	Int16	The format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero.

比较版本

完整来源事实

fields

map[description:Identifies the message as a row description. format:Byte1('T')], map[description:Length of message contents in bytes, including self. format:Int32], map[description:Specifies the number of fields in a row (can be zero). format:Int16], map[description:The field name. format:String], map[description:If the field can be identified as a column of a specific table, the object ID of the table; otherwise zero. format:Int32], map[description:If the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero. format:Int16], map[description:The object ID of the field's data type. format:Int32], map[description:The data type size (see pg_type.typlen ). Note that negative values denote variable-width types. format:Int16], map[description:The type modifier (see pg_attribute.atttypmod ). The meaning of the modifier is type-specific. format:Int32], map[description:The format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero. format:Int16]

来源引用

完整定义与证据 JSON

定义来源

center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f

正文语言: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f