DB2通过java代码生成自定义uuid()函数

Posted on 2020-09-18 10:10  'alt+/'  阅读(469)  评论(0编辑  收藏  举报

一、简单的方法

此种方法在快速大量生成时,会有重复

SELECT concat (hex (RAND ()), hex (RAND ())) as uuid FROM SYSIBM.SYSDUMMY1; --32位大写  

select lower(hex(RAND())||hex(RAND())) as uuid from sysibm.sysdummy1;--32位小写

二、自定函数,调用java生成uuid

import java.util.UUID;

import COM.ibm.db2.app.UDF;

public class UDFUUID extends UDF {

    public static String uuid() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }

}

然后用db2自带的jdk(比如$HOME/sqllib/java/jdk/bin)编译成class

查看DB2自带的jdk_path

$ db2 get dbm cfg | grep -i jdk_path

 Java Development Kit installation path       (JDK_PATH) = /home/db2inst4/sqllib/java/jdk64

/home/db2inst4/sqllib/java/jdk64/bin

(/opt/IBM/db2/V9.7/java/jdk64/bin)

/home/db2inst4/sqllib/java/jdk64/bin/java -c /home/myUserName/UDFUUID.java

 

2.创建自定义函数

第一种:

直接把UDFUUID.class拷贝到$HOME/sqllib/function下。

实例用户cp /home/myUserName/UDFUUID.class /home/db2inst4/sqllib/function/UDFUUID.class

不用重启数据库

 

然后执行:

drop function uuid;  
create function uuid()  
    returns char(32)  
    fenced  
    variant  
    no sql  
    language java  
    parameter style java  
    external name 'UDFUUID!uuid'; 

验证:

values uuid(); 

 

OK了!

 

引用地址:https://www.iteye.com/blog/happyqing-2391526

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