摘要：make的时候出现。。。encdb.so: undefined symbol: rb_encdb_declare将Makefile中的optflag由原来的O3改为O2就可以通过了> If you think the gcc in CentOS 5.4 is buggy, adding optflags="-O2"> to supress optimize level is suggested. 阅读全文

摘要：删除或者添加一个字段alter table tablename drop column columnname;alter table tabelname add columnname varchar2(8) NULL; 阅读全文