php - specify unique key for mysql table in the JSON object -


i implementing app creates json string below. app records json data , send in background server every 60 seconds. user can use app query server buses locations, result displayed in google map marker.

the data of json first inserted in bus table , updated insert into. in bus table not have unique key should add bus_id json string in app know record must updated asking myself whether possible generate , add json string before sending it. how can generate bus_id unique key in case?

json object:

{    "latitude":84.16898451,  "longitude":3.16561387,  "route":45 }

php script.

<?php  $json = '{"bus_id": "gernerated value", "latitude":84.16898451,"longitude":3.16561387,"route":45}';  $data = json_decode ( $json );  $bus_id = "it should generated in app"; $route =   $data->{'route'}; $latitude = $data->{'latitude'}; $longitude = $data->{'longitude'};   require 'connection.php';  // check whether route's table exist. $results = $con->query ( "show tables 'bus' " ) or die ( mysqli_error () );  if (($results->num_rows) == 1) {   //"update myguests set lastname='doe' id=2"  $sql = "replace bus(bus_id, route, latitude, longitude)           values( ?, ?, ? , ? )";    $stmt = $con->prepare($sql) or die ( $con->error );   $stmt->bind_param("ssss",$bus_id,$route, $latitude,$longitude);   $stmt->execute();    $stmt->close();    echo "table exist"; } else {   $create =  "create table bus        (id int(11) not null auto_increment primary key,         bus_id int(11) not null unique,         route int(11) not null,      latitude float(10,6) not null ,       longitude float(10,6) not null,      created_at timestamp default current_timestamp)" ;    $stmt = $con->prepare($create) or die ( $con->error );   $stmt->execute();    $stmt->close();    echo "table created"; }


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