DataRow
DataRow is a backend protocol message. Identifies the message as a data row.
当前阅读 PG 18·选择有来源记录的版本
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('D')
- Field entries
- 5
- Documented flow contexts
- Simple Query
- direction
- B
- manual path
- /docs/18/protocol-message-formats.html
- signature
- DataRow (B)
版本定义 PG 18
-
- Byte1('D')
-
Identifies the message as a data row.
- Int32
-
Length of message contents in bytes, including self.
- Int16
-
The number of column values that follow (possibly zero).
Next, the following pair of fields appear for each column:
- Int32
-
The length of the column value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL column value. No value bytes follow in the NULL case.
- Byte
n -
The value of the column, in the format indicated by the associated format code.
nis the above length.
Wire fields in documented order
| Position | Format | Meaning |
|---|---|---|
| 1 | Byte1('D') | Identifies the message as a data row. |
| 2 | Int32 | Length of message contents in bytes, including self. |
| 3 | Int16 | The number of column values that follow (possibly zero). |
| 4 | Int32 | The length of the column value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL column value. No value bytes follow in the NULL case. |
| 5 | Byte n | The value of the column, in the format indicated by the associated format code. n is the above length. |
比较版本
完整来源事实
fields
map[description:Identifies the message as a data row. format:Byte1('D')], map[description:Length of message contents in bytes, including self. format:Int32], map[description:The number of column values that follow (possibly zero). format:Int16], map[description:The length of the column value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL column value. No value bytes follow in the NULL case. format:Int32], map[description:The value of the column, in the format indicated by the associated format code. n is the above length. format:Byte n]来源引用
定义来源
center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f
正文语言: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f