PG服务进程（Postgres）——idle告诉前端准备好接受查询

PG服务进程（Postgres）——idle告诉前端准备好接受查询

ReadyForQuery启动完成。 前端现在可以发出命令。ReadyForQuery 消息与后端在每个命令周期后发出的消息相同。 根据前端的编码需求，将 ReadyForQuery 视为开始一个命令周期，或将 ReadyForQuery 视为结束启动阶段和每个后续命令周期是合理的。The ReadyForQuery message is the same one that the backend will issue after each command cycle. Depending on the coding needs of the frontend, it is reasonable to consider ReadyForQuery as starting a command cycle, or to consider ReadyForQuery as ending the start-up phase and each subsequent command cycle.

void ReadyForQuery(CommandDest dest) { switch (dest) { case DestRemote: case DestRemoteExecute: case DestRemoteSimple: if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3) { StringInfoData buf; pq_beginmessage(&buf, 'Z'); pq_sendbyte(&buf, TransactionBlockStatusCode()); pq_endmessage(&buf); } else pq_putemptymessage('Z'); /* Flush output at end of cycle in any case. */ pq_flush(); break; case DestNone: case DestDebug: case DestSPI: case DestTuplestore: case DestIntoRel: case DestCopyOut: case DestSQLFunction: case DestTransientRel: case DestTupleQueue: break; }}

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