PHP SQL : How to save data to multiple database from one html form OR how to copy data from one database to another database automatically

Question

I have a html form, say example

<form action="form.php" method="post">
First name:<br>
<input type="text" id="fname" name="fname">
<br>
Last name:<br>
<input type="text" id="lname" name="lname">
<br><br>
<input type="submit" value="Submit">
</form>

and form.php

<?php
$servername = "localhost";
$username = "database1";
$password = "xxxxxxxx";
$dbname = "database1";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

//escape variables for security
$fname = mysqli_real_escape_string($conn, $_POST['fname']);
$lname = mysqli_real_escape_string($conn, $_POST['lname']);

$sql = "INSERT INTO mytable (fname,lname)
VALUES ('$fname','$lname')";

if ($conn->query($sql) === TRUE) {
   echo "Successfully Saved";

    } else {
    echo "Error: Go back and Try Again ! " . $sql . "<br>" . $conn->error;
}

$conn->close();

?>

The form.php is saving that data to database1 .

I want that data to be saved to another database database2 along with database1.

Is it possible ?? If yes then what changes should be made in the code ?

If it is not possible then is it possible to copy data from database1 to database2 automatically? Whenever a new row is added in database1 then it should automatically copied to database2.

I want the same data to be in two different database. How can I achieve any of the above said ??

alamirfan · Accepted Answer · 2015-04-10 19:10:50Z

From php you just have to create new connection to DB.

<?php
   $servername = "localhost";
   $username = "database1";
   $password = "xxxxxxxx";
   $dbname = "database1";


   $servernameS = "localhost";
   $usernameS = "database2";
   $passwordS = "xxxxxxxx";
   $dbnameS = "database2";

   // Create connection
   $conn = new mysqli($servername, $username, $password, $dbname);
   $connS = new mysqli($servernameS, $usernameS, $passwordS, $dbnameS);

   // Check connection
  if ($conn->connect_error) {
       die("Connection failed: " . $conn->connect_error);
   }
   if ($connS->connect_error) {
       die("Connection failed: " . $connS->connect_error);
   }

   //escape variables for security
   $fname = mysqli_real_escape_string($conn, $_POST['fname']);
   $lname = mysqli_real_escape_string($conn, $_POST['lname']);

   $sql = "INSERT INTO mytable (fname,lname) 
   VALUES ('$fname','$lname')";

    if ($conn->query($sql) === TRUE) {
     echo "Successfully Saved";

    } else {
      echo "Error: Go back and Try Again ! " . $sql . "<br>" . $conn->error;
    }

    if ($connS->query($sql) === TRUE) {
     echo "Successfully Saved";

    } else {
      echo "Error: Go back and Try Again ! " . $sql . "<br>" . $connS->error;
    }
    $conn->close();
    $connS->close();

   ?>

Lumpy Wizard · Accepted Answer · 2015-04-09 15:20:52Z

2

What it sounds like you need is to setup replication.

Here is the official documentation on replication. Here is a simpler step-by-step guide setting it up.

If replication isn't what you wanted, you could accomplish the same thing by connecting to database2 in addition to database1 then running the query once on both.

answered Apr 9, 2015 at 15:20

Lumpy Wizard

1531 silver badge5 bronze badges

Comments

Community · Accepted Answer · 2017-05-23 11:57:03Z

You can use something like using mysqli::selectDB method:

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
    $row = $result->fetch_row();
    printf("Default database is %s.\n", $row[0]);
    $result->close();
}

/* change db to world db */
$mysqli->select_db("world");

/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
    $row = $result->fetch_row();
    printf("Default database is %s.\n", $row[0]);
    $result->close();
}

$mysqli->close();
?>

Check out the manual.

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