As you know magento table structure is been built upon EAV (Entity Attribute Value) structure. Magento uses EAV to add more number of fields to table dynamically. Just to get one single record, Magento joins 4-5 tables to get data in EAV. So juts to convert one filed type to another you have to edit more number of tables as well and take their value as well which is not a good idea and can’t be managed easily. So lets what EAV is an how it works.
Lets take a little look about EAV so that you will understand better and can understand how to convert attribute type.

Magento Convert Attribute Type from price type to text type and vice versa and change all other attribute type another type
Magento Convert Attribute Type

EAV(Entity Attribute Value ):

EAV is a technique which allows you to add unlimited columns to your table dynamically. I mean the fields which is represented in ‘column’ way in a regular table, is represented in a ‘row’ (records) way in EAV table.


Entity represent magento data item such as product, categories, customer, orders.Each entity will have its own record in database.


Attribute represent magento data item which belongs to entity. for example product entity has attribute such as price, name, status etc.


Value is just the value of an attribute that linked to.

So in the table table structure way one table hold attribute values called eav_attribute and 5-6 tables which holds entity and data in fully normalized form which will be different for different datatype like

  • For integer value : eav_entity_int
  • For Varchar value : eav_entity_varchar
  • For Datetime values : eav_entity_datetime
  • For Decimal/float values : eav_entity_decimal
  • For holding text (mysql Text type) values : eav_entity_text.

So let come back to our conversion for convert attribute type in magento
Here I have a custom script called “AttributeTypeConversion” and will work for text type to price and vice versa.In this script you can also convert more number attribute in a single time.No need to go for database table and to change manually . You will only also need to enter the attribute type and attribute code then submit and finally you will be getting the number records which was changed and make sure you will do this in development server not production server and also take whole database backup to avoid damage of database table.
Just download the AttributeTypeConversion.php file from AttributeTypeConversion or from last of article and place that php file in magento root directory and run in browser by

Here is the article to know How to import export sql file from command line.

mysqldump -u [uname] -p[pass] dbname > db_backup.sql

Download magento convert attribute type file from AttributeTypeConversion

 * AttributeTypeConversion magento extension
 * This source file is subject to the MIT License
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * @category       Magento
 * @package        AttributeTypeConversion
 * @copyright      Copyright (c) 2016
 * @license MIT License
 * Script change attribute type of magento products
 * @category       Magento
 * @package        AttributeTypeConversion
 * @author         Jyotiranjan Biswal<>
define('MAGENTO', realpath(dirname(__FILE__)));
require_once MAGENTO . '/app/Mage.php';

$manageAttribute = new manageAttribute();
class manageAttribute{
    private $_attributeCodesArray;
    private $_attributeCodes;
    private $_success = false;
    private $_frontendInput;
    private $_backendType;
    private $_message;
    private $_from;
    private $_to;
    * Initialize the Mage application
    function __construct()
        // Increase maximum execution time to 4 hours
        ini_set('max_execution_time', 14400);
        // Set working directory to magento root folder
        // Make files written by the profile world-writable/readable
        ini_set('display_errors', 1);
        Mage::register('isSecureArea', 1);

        // Run the main application
    * Run the main application and call the appropriate function
    * depending on the command.
    private function _runMain()
        $this->_redirectUrl = $_SERVER['PHP_SELF'];
        if ($_SERVER["REQUEST_METHOD"] == "POST") {
            $messageType = 'error';
            return false;
            //return false;
        $messageType = 'success';
    function validate(){
        if((isset($_POST['attribute_codes']) && $_POST['attribute_codes'] != '')){
            $this->_attributeCodes = $_POST['attribute_codes'];
            $this->_attributeCodesArray = explode(',',(string)$this->_attributeCodes);
            $this->_message = 'Please enter attribute code separated by comma';
            return false;
        if((isset($_POST['frontend_input']) && $_POST['frontend_input'] != '')){
            $this->_frontendInput = $_POST['frontend_input'];
            $this->_message = 'Please enter attribute type';
            return false;
        if($this->_frontendInput == 'price'){
            $this->_from = 'catalog_product_entity_varchar';
            $this->_to = 'catalog_product_entity_decimal';
            $this->_backendType = 'decimal';
        }else if($this->_frontendInput == 'text'){
            $this->_from = 'catalog_product_entity_decimal';
            $this->_to = 'catalog_product_entity_varchar';
            $this->_backendType = 'varchar';
        return true;
    function changeInEavAttributeTable($backendType,$frontendInput){
        $array = $this->_attributeCodesArray;
        $connection = $this->_getConnection('core_write');	
        foreach($this->_attributeCodesArray as $code){
            $sql = 'UPDATE '.$this->_getTableName('eav_attribute').' SET frontend_input = '.'"'.$frontendInput.'"'.', backend_type = '.'"'.$backendType.'"'.' WHERE attribute_code = '.'"'.$code.'"';
        $attributeIds = (string) implode(',', $this->_getAttributeIds());
        $this->_updatedMessage = 'eav_attribute table is UPDATED with attribute codes '.$this->_attributeCodes.' and attribute Ids '.$attributeIds;
    function changeAttributeType($from,$to){
        # EDIT HERE...Note the single quotes inside the double quotes. This is necessary unless you modify the function yourself
        # Note that these attribute codes are those attributes whose type is to be changed.
        //$this->_attributeCodesArray = array("'purchase_price'");
        $connection = $this->_getConnection('core_write');
        $attributeIds = (string) implode(',', $this->_getAttributeIds());
        $entityTypeId = (int) $this->_getEntityTypeId();
        $sql = 'SELECT * FROM ' . $this->_getTableName($this->_from) . ' WHERE attribute_id IN ('.$attributeIds.') AND entity_type_id = '.$entityTypeId;
        $rows = $connection->fetchAll($sql);
        $insertCount = 1;
        $deleteCount = 1;
        $insertOutput = '';
        $deleteOutput = '';
        foreach($rows as $row){
            $checkIfDecimalValueExists = $this->_checkIfDecimalValueExists($row);
            $sql = 'INSERT INTO ' . $this->_getTableName($this->_to) . ' (`entity_type_id`,`attribute_id`,`store_id`,`entity_id`,`value`)
                    VALUES (?,?,?,?,?)';
            $price = $row['value'];
            $price = trim(str_replace(',', '.', $price));
            $connection->query($sql, array($row['entity_type_id'], $row['attribute_id'], $row['store_id'], $row['entity_id'], $price));
            $insertOutput .= $insertCount . '> INSERTED::' . $connection->lastInsertId() . ' :: ' .$row['value'] . ' => ' . $price . '<br />';
            $sql = 'DELETE FROM ' . $this->_getTableName($this->_from) . ' WHERE value_id = ?';
            $connection->query($sql, $row['value_id']);
            $deleteOutput .= $deleteCount . '> DELETED::'.$row['value_id'].'<br />';
        $this->_message .= '==========UPDATED===============================<br />';
        $this->_message .= '<strong>'.$this->_updatedMessage.'</strong><br />';
        $this->_message .= '==================================================<br />';
        $this->_message .= '==========INSERTED=======================================<br />';
        $this->_message .= '<strong>INSERTED from table '.$this->_from.' to table '.$this->_to.'</strong><br />';
        $this->_message .= $insertOutput;
        $this->_message .= '=================================================<br />';
        $this->_message .= '==========DELETED=======================================<br />';
        $this->_message .= '<strong>DELETED from '.$this->_from.'</strong><br />';
        $this->_message .= $deleteOutput;
        $this->_message .= '=================================================<br />';
    function _getTableName($tableName){
        return Mage::getSingleton('core/resource')->getTableName($tableName);
    function _getConnection($type = 'core_read'){
        return Mage::getSingleton('core/resource')->getConnection($type);
    function _getAttributeIds(){
        //global $_attributeCodes;
        $attributeCodes = '';
        foreach($this->_attributeCodesArray as $codes){
            $attributeCodes .= "'".$codes."',";
        $attributeCodes = rtrim($attributeCodes, ",");
        //$attributeCodes = (string) implode(',', $this->_attributeCodesArray);
        $connection = $this->_getConnection('core_read');
        $sql = "SELECT attribute_id
                FROM " . $this->_getTableName('eav_attribute') . "
                WHERE attribute_code
                IN (
                    ". $attributeCodes . "
        //SELECT attribute_id FROM eav_attribute WHERE attribute_code IN('custom_price_new','purchase_price');
        return $connection->fetchCol($sql);
    function _getEntityTypeId(){
        $connection = $this->_getConnection('core_read');
        $sql		= "SELECT entity_type_id FROM " . $this->_getTableName('eav_entity_type') . " WHERE entity_type_code = 'catalog_product'";
        return $connection->fetchOne($sql);
    function _checkIfDecimalValueExists($row){
        $connection = $this->_getConnection('core_write');
        $sql		= 'SELECT COUNT(*) FROM ' . $this->_getTableName($this->_to) . ' WHERE attribute_id = ? AND entity_type_id = ? AND store_id = ? AND entity_id = ?';
        $result		= $connection->fetchOne($sql, array($row['attribute_id'], $row['entity_type_id'], $row['store_id'], $row['entity_id']));
        return $result > 0 ? true : false;
    private function DisplayForm($messageType,$logMessage='')
        // Set character set to UTF-8
        header("Content-Type: text/html; charset=UTF-8");
        <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
        <html xmlns="">
            <meta http-equiv="Content-type" content="text/html;charset=UTF-8" />
            <title>Change attribute type from price type to text type and vice versa</title>
            <style type="text/css">
                .main_div{margin:0 auto;width: 60%;}
                .input_type{width: 98%;}
                .main_table{margin: 1em auto;width: 100%;}
                .second{width: 70%;}
                .first{width: 30%;text-align: right}
            <form method="post" action="">
                <h2 style="text-align:center;">Welcome to change atribute type</h2>
                <div style="clear:both;"></div>
                <div class="main_div">
                    <legend>Change attribute type from price type to text type and vice versa</legend>
                    <?php if($_SERVER["REQUEST_METHOD"] == "POST"): ?>
                    <table style="margin: 1em auto;" cellpadding="2">
                            echo "<pre>";
                            echo "</pre>";
                        <?php if($messageType == 'success'): ?>
                        <td style="color: #48961B;"><?php echo $this->_message; ?></td>
                        <?php elseif($messageType == 'error'): ?>
                        <td style="color: #F70E0E;"><?php echo $this->_message; ?></td>
                        <?php endif ?>
                    <?php endif; ?>
                    <table class="main_table" cellpadding="2">
                        <th class="first" style="">Enter attribute codes separated by comma: </th>
                        <th class="second"><input class='input_type' type="text" name='attribute_codes' value=""/></th>
                        <th class="first">Enter attribute type to convert: </th>
                        <th class="second"><input class='input_type' type="text" name='frontend_input' value=""/></th>
                        <th class="first"></th>
                        <th class="second"><input type="submit" name="submit" value="Submit"></th>

Thanks for visiting the article magento convert attribute type.

magento convert attribute type
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One thought on “magento convert attribute type

  • November 16, 2016 at 12:27 pm

    Thanks Jyoti this artical is very helpfull for me.
    thanks once again


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