Parse

Parse is a frontend protocol message. Identifies the message as a Parse command.

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Direction: Frontend → backend
First wire field: Byte1('P')
Field entries: 6
Documented flow contexts: Extended Query
direction: F
manual path: /docs/18/protocol-message-formats.html
signature: Parse (F)

版本定义 PG 18

Byte1('P'): Identifies the message as a Parse command.
Int32: Length of message contents in bytes, including self.
String: The name of the destination prepared statement (an empty string selects the unnamed prepared statement).
String: The query string to be parsed.
Int16: The number of parameter data types specified (can be zero). Note that this is not an indication of the number of parameters that might appear in the query string, only the number that the frontend wants to prespecify types for.

Then, for each parameter, there is the following:

Int32: Specifies the object ID of the parameter data type. Placing a zero here is equivalent to leaving the type unspecified.

Wire fields in documented order

Position	Format	Meaning
1	Byte1('P')	Identifies the message as a Parse command.
2	Int32	Length of message contents in bytes, including self.
3	String	The name of the destination prepared statement (an empty string selects the unnamed prepared statement).
4	String	The query string to be parsed.
5	Int16	The number of parameter data types specified (can be zero). Note that this is not an indication of the number of parameters that might appear in the query string, only the number that the frontend wants to prespecify types for.
6	Int32	Specifies the object ID of the parameter data type. Placing a zero here is equivalent to leaving the type unspecified.

比较版本

完整来源事实

fields

map[description:Identifies the message as a Parse command. format:Byte1('P')], map[description:Length of message contents in bytes, including self. format:Int32], map[description:The name of the destination prepared statement (an empty string selects the unnamed prepared statement). format:String], map[description:The query string to be parsed. format:String], map[description:The number of parameter data types specified (can be zero). Note that this is not an indication of the number of parameters that might appear in the query string, only the number that the frontend wants to prespecify types for. format:Int16], map[description:Specifies the object ID of the parameter data type. Placing a zero here is equivalent to leaving the type unspecified. format:Int32]

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