如果需要blob，请说服dba，这就是您所需要的.这些数据类型是有原因的，任何滚动实现都会比内置类型差.

If a blob is what you need convince your dba it's what you need. Those data types are there for a reason and any roll your own implementation will be worse than the built in type.

另外，您可能希望查看 CLOB 类型，因为它可以满足您的需求很好.

Also you might want to look at the CLOB type as it will meet your needs quite well.