ParameterDescription
ParameterDescription is a backend protocol message. Identifies the message as a parameter description.
Reading PG 18·Select a recorded version
- Direction
- Backend → frontend
- First wire field
- Byte1('t')
- Field entries
- 4
- Documented flow contexts
- Extended Query
- direction
- B
- manual path
- /docs/18/protocol-message-formats.html
- signature
- ParameterDescription (B)
Definition PG 18
-
- Byte1('t')
-
Identifies the message as a parameter description.
- Int32
-
Length of message contents in bytes, including self.
- Int16
-
The number of parameters used by the statement (can be zero).
Then, for each parameter, there is the following:
- Int32
-
Specifies the object ID of the parameter data type.
Wire fields in documented order
| Position | Format | Meaning |
|---|---|---|
| 1 | Byte1('t') | Identifies the message as a parameter description. |
| 2 | Int32 | Length of message contents in bytes, including self. |
| 3 | Int16 | The number of parameters used by the statement (can be zero). |
| 4 | Int32 | Specifies the object ID of the parameter data type. |
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Complete source facts
fields
map[description:Identifies the message as a parameter description. format:Byte1('t')], map[description:Length of message contents in bytes, including self. format:Int32], map[description:The number of parameters used by the statement (can be zero). format:Int16], map[description:Specifies the object ID of the parameter data type. format:Int32]Source references
Full definition and evidence JSON
Definition sources
center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f
Text language: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f