Optimized the database exception to implement unique constraint error…

… detection. (#7194)

src/PostgreSqlConnection.php

@@ -12,6 +12,7 @@
 
 namespace Hyperf\Database\PgSQL;
 
+use Exception;
 use Hyperf\Database\Connection;
 use Hyperf\Database\PgSQL\DBAL\PostgresDriver;
 use Hyperf\Database\PgSQL\Query\Grammars\PostgresGrammar as QueryGrammar;
@@ -48,6 +49,16 @@ public function bindValues(PDOStatement $statement, array $bindings): void
         }
     }
 
+    /**
+     * Determine if the given database exception was caused by a unique constraint violation.
+     *
+     * @return bool
+     */
+    protected function isUniqueConstraintError(Exception $exception)
+    {
+        return $exception->getCode() === '23505';
+    }
+
     /**
      * Get the default query grammar instance.
      * @return PostgresGrammar