postgresql - SELECT CURRVAL (pg_get_serial_sequence 我做错了什么？

Question

我做错了什么，在第一条语句将它插入我的表后，我试图从表中获取最后一个 record_id。我似乎只打印了用于显示最后一个 id 的代码？

      SELECT CURRVAL (pg_get_serial_sequence('sheet_tbl','sheet_id'))";

代码在这里

  else {
        echo 'Record added';
        $sql = "INSERT INTO sheet_tbl (site_id,  eventdate, eventtime, username, additionalvolunteers) VALUES ('$_POST[site_id]','$_POST[eventdate]','$_POST[eventtime]', '$username','$_POST[additionalvolunteers]')";

        echo $sql; //Just so I can see what is getting sent
        $result = pg_query($sql);

        $sheet_id_pull = "SELECT CURRVAL (pg_get_serial_sequence('sheet_tbl','sheet_id'))";
        echo $sheet_id_pull; //This is where im having the issue with the above line.
}

Answer 1

也许

echo pg_query($sheet_id_pull);

代替

echo $sheet_id_pull;

或者

$sheet_id_pull = pg_query("SELECT CURRVAL (pg_get_serial_sequence('sheet_tbl','sheet_id'))");
echo $sheet_id_pull;

另请阅读 this问题。它有更好的方法来获取插入的 ID。