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DB schema auto increment in Magento 2

To ensure the identity of each entry, the primary key columns of database tables in Magento 2 often employ auto-increment capabilities. When a new row is added to a table, the auto-increment column is automatically given a value one higher than the column’s previous highest value.

Magento 2 uses auto-increment to guarantee that each entry in a table has a unique identifier, eliminating the need for human assignment. This makes putting new data into the database easier and helps to preserve data integrity.

Using Magento 2, get the Auto Increment Field from a table.

As a best coding practice, we may retrieve the Auto Increment Field from a database table using Magento 2. To retrieve the auto-increment field from the table, we must use getAutoIncrementField().

Output: If an auto-increment field is available, returns the field name; otherwise, returns false.

?php
namespace Path\To\Class;
use Magento\Framework\App\ResourceConnection;
class AutoIncrementField {
const ORDER_TABLE = 'sales_order';
/**
* @var ResourceConnection
*/
private $resourceConnection;
public function __construct(
ResourceConnection $resourceConnection
) {
$this->resourceConnection = $resourceConnection;
}
/**
* get AutoIncremntFieldName using Query
*
* @return string|bool
*/
public function getAutoIncremntFieldName()
{
$connection = $this->resourceConnection->getConnection();

$tableName = $connection->getTableName(self::ORDER_TABLE);

$getFieldName = $connection->getAutoIncrementField($tableName);

To examine the sales_order table for the auto_increment field name, we may use the $this-getAutoIncremntFieldName() method.

Here the output is entity_id

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