数据库创建自增id

数据库创建自增id

——创建序列
create   sequence STUDENT_seq
INCREMENT  BY   1 　
START  WITH   1 　　
NOMAXVALUE　　　
NOCYCLE　　　　　
noCACHE;
----创建触发器
create or replace trigger STUDENT
before insert on STUDENT
for each row
begin
select STUDENT_seq.nextval into :new.id from dual;
end;

下面是uuid
String id=UUID.randomUUID().toString().replace("-","").toUpperCase();

创建工具类uuid
package com.jzkj.career.utils;

import java.util.UUID;

public class UUIDUtils {

public static String getUUID() {
UUID uuid = UUID.randomUUID();
String str = uuid.toString();
// 去掉"-"符号
String temp = str.substring(0, 8) + str.substring(9, 13) + str.substring(14, 18) + str.substring(19, 23) + str.substring(24);
return temp;
}

public static void main(String[] args) {
for (int i = 0; i < 9; i++) {
String uuid = UUIDUtils.getUUID();
System.out.println(uuid);
}
}

}