Is it possible to add new field without editing my database but using PHP code or jquery to insert new field in my database, so let's say i have a table name MAIN
with (COL1 ,COL2)
and in my PHP code/jquery will insert new field (COL 3)
in my database. Is it possible?
$result=("SELECT * FROM main");
$res = $conn->query($result);
if(isset($_POST['Add'])){
if(empty($_POST['ParentCreate'])){
echo "Fill up the textbox";
}else{
$sql = "ALTER TABLE tablemain ADD COLUMN
'".$_POST['ParentCreate']."' VARCHAR(100) NOT NULL COMMENT '' AFTER
main_one";
$conn->query($sql);
echo "New Field created";
}
}
-----------------------------------
<body>
<div id="frm_div">
<form id="frm1" action="">
<input type="text" name="ParentCreate" placeholder="ParentCreate" />
<input type="submit" name="Add" value="Add" />
</form>
</div>
<div id="result">
<?php
if($res!=""){
while($row=$res->fetch_row()){
echo $row[0]."<br/>";
echo $row[1]."<br/>";
}
}else{
echo "Nothing Found";
}
?>
</div>
First have a look at this: W3 Schools | SQL ALTER
The SQL Code you are looking for:
ALTER TABLE table_name
ADD column_name datatype [AFTER previous_column_name]
[AFTER] -> optional, default at the end.
In your case it's (let's suppose the datatype for COL3 is VARCHAR):
ALTER TABLE MAIN
ADD COL3 VARCHAR(30) [AFTER previous_column_name]
If you do not even know how to use mysqli in PHP have a look at the PHP.net MySQLi Documentation (Alternative: php.net/manual/en/book.mysql.php)
But watch out! PHP will drop support for MySQL, so you better use MySQLi.
Get connected with the Host:
$conn = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD)
or die("Failed to connect to Database: " . mysql_error());
Select the Database:
$db = mysql_select_db(DB_NAME, $conn)
or die("Failed to select Database: " . mysql_error());
Define your Query:
$sql = "ALTER TABLE tablemain
ADD '".$_POST['ParentCreate']."' VARCHAR(100) NOT NULL AFTER main_one";
Fire your Query:
mysql_query($sql) or die("Failed adding column: " . mysql_error());
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