app/code/vendor/modulename/Setup/UpgradeSchema.php
app/code/vendor/modulename/Setup/UpgradeSchema.php
<?php
namespace Vendor\Module\Setup;
use Magento\Framework\Setup\UpgradeSchemaInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\SchemaSetupInterface;
class UpgradeSchema implements UpgradeSchemaInterface
{
public function upgrade(SchemaSetupInterface $setup,
ModuleContextInterface $context){
$setup->startSetup();
if (version_compare($context->getVersion(), '1.0.1') < 0) {
// Get module table
$tableName = $setup->getTable('admin_user');
// Check if the table already exists
if ($setup->getConnection()->isTableExists($tableName) == true) {
// Declare data
$columns = [
'tok_value' => [
'type' => \Magento\Framework\DB\Ddl\Table::TYPE_TEXT,
'nullable' => true,
'comment' => 'Token Value',
],
];
$connection = $setup->getConnection();
foreach ($columns as $name => $definition) {
$connection->addColumn($tableName, $name, $definition);
}
}
}
$setup->endSetup();
}
}
Note: If you face any issue, it may be due to the module that you have already installed. As you know, if the module is already installed then setup:upgradesetup:upgrade command does not install schema. You will need to look into your setup_modulesetup_module table, delete your module from the table and re-run the php bin/magento setup:upgradephp bin/magento setup:upgrade command.