relate two tables

[sql]

hi all I have two tables;
table student (
UserId int Not null auto_increment ,
UniversityN varchar(10) Not null,
AstComposition varchar(3) Null,
BstComposition varchar(3) default null,
......)
table ApplyStatus(
UserId int Not null ,
UniversityN varchar(10) Not null,
UserIp varchar(45) Not Null,
AccessTime varchar(45) Not Null,
PRIMARY KEY (UserId),
FOREIGN Key(UserId) REFERENCES student(UserId) on Delete
Cascade on update cascade)Type=InnoDB DEFAULT CHARSET=utf8;
I want to use setAutocommit( false) to update this two table on the same time, and I relize I make a mistake , how to get my userId on the second table
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