Insert multiple rows and documents from JSON files to MySQL database with PHP -


i wrote php code extract values json file , insert them mysql database.

<?php //connect mysql db $con = mysqli_connect("localhost","root","","db_tweets") or die('could not connect: ' . mysql_error());  //read json file contents $jsondata = file_get_contents('prova.json');  //convert json object php associative array $data = json_decode($jsondata, true);  foreach ($data $u => $z){     foreach ($z $n => $line){         //get tweet details         $text = $line['text'];         $id_tweet = $line['id_str'];         $date = $line['created_at'];         $id_user = $line['user']['id_str'];         $screen_name = $line['user']['screen_name'];         $name = $line['user']['name'];          $sqlu = "insert user(id_user, screen_name, name)             values ('".$id_user."', '".$screen_name."', '".$name."')";     } } if(!mysqli_query($con, $sqlu)) {     die('error : ' . mysql_error()); } ?>

in doing insert values in first line of table, overwriting previous value. remains last.

how can i:

1) insert values in multiple lines?

2) parse multiple json files?

with every loop you're overwriting last $sqlu value before ever passing variable mysqli_query function after loops. once loops completed you're left last assigned value $sqlu, , that's 1 gets executed.

instead, execute query inside loop and...

use php mysqli_ functions mysqli_prepare, mysqli_stmt_bind_param, , mysqli_stmt_execute simplify , secure query:

//connect mysql db $con = mysqli_connect("localhost","root","","db_tweets") or die('could not connect: ' . mysql_error());  // prepare insert query $stmt = mysqli_prepare($con, 'insert user(id_user, screen_name, name) values (?, ?, ?)');  // bind upcoming variable names query statement mysqli_stmt_bind_param($stmt, 'iss', $id_user, $screen_name, $name);  // loop on json files $jsonfiles = array('prova.json', 'provb.json', 'provc.json'); foreach ( $jsonfiles $jsonfile ) {      //read json file contents     $jsondata = file_get_contents($jsonfile);         //convert json object php associative array     $data = json_decode($jsondata, true);      foreach ($data $u => $z){         foreach ($z $n => $line){             //get tweet details             $id_user = $line['user']['id_str'];             $screen_name = $line['user']['screen_name'];             $name = $line['user']['name'];              // execute insertion             mysqli_stmt_execute($stmt);         }     } }

so, not uses fewer database resources preparing query once, , has cleaner code, escapes insertion values protect against sql injection.

added array $jsonfiles containing number of json filenames, , used foreach construct loop on json files.


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