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最近手上有一项目，需要把数据库从SQL SERVER切换到MySQL,其业务原因暂且不提。小弟拿到这一项目之后，头痛不已，因为项目中用到了SQL Server2008的一些新的数据类型，包括Geometry,包括hierarchyid（级联ID）这类SQL Server新的数据类型。当然，MySQL自V5之后，支持Geometry但还不支持基于Geometry的运算，因此在做数据迁移的时候，此方面必须要有所考虑。当然，这是后话，先不管三七二十一，先把数据全部导到MySQL之中再说。
在做前期技术选型的时候，我想过用ETL工具，而且手上也有好几个用得比较熟悉的ETL工具，但，一想到要拖拖拉拉建模，而且表那么多（本次初步估了一下，涉及到差不多500多张表...），像hierarchyid这种字段，在转换的时候，还得要在源数据上做转换，头昏，脑涨，奶酸，蛋痛等一切症状全上来了。前不久在某坛子上看到对Perl的介绍，外加掌握Perl会简化Linx的运维工作。于是摩拳擦掌准备用Perl来写一个导数据脚本。由于上弟在之前从没用Perl写过任何脚本，哪怕一行都木有，所以，迅速找到一本Perl的电子本【Perl语言入门 第五版】，人称“小骆驼”。
废话不多说，先说一下，我对程序的大概的思路：
先建数据表，在建表的时候，暂时不做太大的数据字段上边的改多。（之前我还在想，直接把级联ID自动拆分为2个字段，ID与ParentID，但在第一轮测试的过程中，发现因为级联ID被用作了外键，在做转换的时候，会出现字段重复啊，冲突啊神马的东西，而且，这种外键也不是很好自动关联，只好放弃。）
再导数据，用最简单的方法先导出来，从SQL SERVER中查出来，插入到MYSQL就完事。但在这里我做了一个测试，如果把一整张表放到内存中，服务器基本不用干其它事了。于是我在这里把一张数据表拆分了，每次导2000条。。。
最后再查出使用过级联ID（hierarchyid）的字段，再写脚本处理这些表的字段。
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