protocol.sgml

关系型数据库 Postgresql 6.5.2

<Term>
	String("")
</Term>
<ListItem>
<Para>
		Unused.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
EncryptedPasswordPacket (F)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Int32
</Term>
<ListItem>
<Para>
		The size of the packet in bytes.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	String
</Term>
<ListItem>
<Para>
		The encrypted (using crypt()) password.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
ErrorResponse (B)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('E')
</Term>
<ListItem>
<Para>
		Identifies the message as an error.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	String
</Term>
<ListItem>
<Para>
		The error message itself.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
FunctionCall (F)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('F')
</Term>
<ListItem>
<Para>
		Identifies the message as a function call.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	String("")
</Term>
<ListItem>
<Para>
		Unused.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Int32
</Term>
<ListItem>
<Para>
		Specifies the object ID of the function to call.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Int32
</Term>
<ListItem>
<Para>
		Specifies the number of arguments being supplied to the
		function.
</Para>
<Para>
	Then, for each argument, there is the following:
<VariableList>
<VarListEntry>
<Term>
		Int32
</Term>
<ListItem>
<Para>
			Specifies the size of the value of the argument,
			excluding this size.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
		Byte<Replaceable>n</Replaceable>
</Term>
<ListItem>
<Para>
			Specifies the value of the field itself in binary
			format.  <Replaceable>n</Replaceable> is the above size.
</Para>
</ListItem>
</VarListEntry>
</VariableList>

</Para>
</ListItem>
</VarListEntry>
</VariableList>

</Para>

</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
FunctionResultResponse (B)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('V')
</Term>
<ListItem>
<Para>
		Identifies the message as a function call result.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Byte1('G')
</Term>
<ListItem>
<Para>
		Specifies that a nonempty result was returned.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Int32
</Term>
<ListItem>
<Para>
		Specifies the size of the value of the result, excluding this
		size.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Byte<Replaceable>n</Replaceable>
</Term>
<ListItem>
<Para>
		Specifies the value of the result itself in binary format.
		<Replaceable>n</Replaceable> is the above size.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Byte1('0')
</Term>
<ListItem>
<Para>
		Unused.  (Strictly speaking, FunctionResultResponse and
		FunctionVoidResponse are the same thing but with some optional
		parts to the message.)
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
FunctionVoidResponse (B)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('V')
</Term>
<ListItem>
<Para>
		Identifies the message as a function call result.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Byte1('0')
</Term>
<ListItem>
<Para>
		Specifies that an empty result was returned.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
NoticeResponse (B)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('N')
</Term>
<ListItem>
<Para>
		Identifies the message as a notice.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	String
</Term>
<ListItem>
<Para>
		The notice message itself.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
NotificationResponse (B)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('A')
</Term>
<ListItem>
<Para>
		Identifies the message as a notification response.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Int32
</Term>
<ListItem>
<Para>
		The process ID of the notifying backend process.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	String
</Term>
<ListItem>
<Para>
		The name of the condition that the notify has been raised on.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
Query (F)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('Q')
</Term>
<ListItem>
<Para>
		Identifies the message as a query.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	String
</Term>
<ListItem>
<Para>
		The query string itself.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
ReadyForQuery (B)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('Z')
</Term>
<ListItem>
<Para>
		Identifies the message type.  ReadyForQuery is sent
		whenever the backend is ready for a new query cycle.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
RowDescription (B)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('T')
</Term>
<ListItem>
<Para>
		Identifies the message as a row description.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Int16
</Term>
<ListItem>
<Para>
		Specifies the number of fields in a row (may be zero).
</Para>
<Para>
	Then, for each field, there is the following:
<VariableList>
<VarListEntry>
<Term>
		String
</Term>
<ListItem>
<Para>
			Specifies the field name.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
		Int32
</Term>
<ListItem>
<Para>
			Specifies the object ID of the field type.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
		Int16
</Term>
<ListItem>
<Para>
			Specifies the type size.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
		Int32
</Term>
<ListItem>
<Para>
			Specifies the type modifier.
</Para>
</ListItem>
</VarListEntry>
</VariableList>

</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
StartupPacket (F)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Int32(296)
</Term>
<ListItem>
<Para>
		The size of the packet in bytes.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	Int32
</Term>
<ListItem>
<Para>
		The protocol version number.  The most significant 16 bits are
		the major version number.  The least 16 significant bits are
		the minor version number.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	LimString64
</Term>
<ListItem>
<Para>
		The database name, defaults to the user name if empty.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	LimString32
</Term>
<ListItem>
<Para>
		The user name.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	LimString64
</Term>
<ListItem>
<Para>
		Any additional command line arguments to be passed to the
		backend by the postmaster.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	LimString64
</Term>
<ListItem>
<Para>
		Unused.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	LimString64
</Term>
<ListItem>
<Para>
		The optional tty the backend should use for debugging messages.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
Terminate (F)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Byte1('X')
</Term>
<ListItem>
<Para>
		Identifies the message as a termination.
</Para>
</ListItem>
</VarListEntry>
</VariableList>


</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
UnencryptedPasswordPacket (F)
</Term>
<ListItem>
<Para>

<VariableList>
<VarListEntry>
<Term>
	Int32
</Term>
<ListItem>
<Para>
		The size of the packet in bytes.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>
	String
</Term>
<ListItem>
<Para>
		The unencrypted password.
</Para>
</ListItem>
</VarListEntry>
</VariableList>

</Para>
</ListItem>
</VarListEntry>
</VariableList>

</sect1>
</Chapter>