声明了@Readonly的属性，建表时仍要执行@Comment

[Leewell1989]

@Column("BORROW_TIME")
@Comment("借阅日期")
@Readonly
private String borrowTime; 

2017-08-10 12:00:53,413 DEBUG [localhost-startStop-1] o.n.d.i.s.r.NutDaoExecutor#log [113] comment on column YDM_PLEDGE_INFO.BORROW_TIME is '借阅日期'
2017-08-10 12:00:53,413 INFO [localhost-startStop-1] o.n.d.i.s.r.NutDaoExecutor#log [110] Can't identify SQL type :   comment on column YDM_PLEDGE_INFO.BORROW_TIME is '借阅日期'
2017-08-10 12:00:53,438 DEBUG [localhost-startStop-1] c.a.d.p.PreparedStatementPool#put [123] stmt enter cache
2017-08-10 12:00:53,445 DEBUG [localhost-startStop-1] o.n.d.i.s.r.NutDaoExecutor#exec [97] SQLException
com.ibm.db2.jcc.am.SqlSyntaxErrorException: DB2 SQL Error: SQLCODE=-205, SQLSTATE=42703, SQLERRMC=BORROW_TIME;DB2ADMIN.YDM_PLEDGE_INFO, DRIVER=4.16.53 

既然@column在建表时不执行，@comment应该也不执行。