An abstract base class for PostgreSQL frontend messages.
We treat client messages like server messages, dedicating a subclass to each message type. The subclass is expected to provide accessors to set the message fields, and an encodeData function that uses the appendByte/appendInt32 and other functions to assemble the encoded message. The base class prepends the message type and length.
The message is sent by enqueue()ing it to a write buffer.
Creates a new PgClientMessage of type t.
Appends a single byte c to the message data.
Appends the bytes from s to the message data.
Appends n to the message data as a 16-bit integer in network byte order.
Appends n to the message data as a 32-bit integer in network byte order.
Appends s to the message data as a NUL-terminated string.
Every PgClientMessage subclass must implement this function, which is used by enqueue() to encode the type-specific part of messages.
Assembles a message, and appends the resulting packet (type, length, data) to buf. It relies on subclasses to "encodeData()" properly.
This virtual destructor exists only for safe subclassing.
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