DB2与 SQLSERVER的自增

/*自增序列：
   DB2:
       create table TestTable
       (
        recordindex  integer identity generated as always,
        stringDateTime  varchar(50),
        TrueDateTime timestamp
       );
   SQLServer:
      create table TestTable
      (
       recordindex  int identity,
       stringDateTime  varchar(50),
       TrueDateTime datetime
      )
/*自增返回
    SQLServer: "SELECT @@IDENTITY"
    DB2:"select max(序号) from TableA"