src/org/nutz/dao/entity/Record.java
public Object remove(String name) {
        keys.remove(name);
        return map.remove(name.toLowerCase());
    }
public Object remove(String name) {
        keys.remove(name);
        return map.remove(name.toLowerCase());
    }
移除一个字段

@param name 字段名
@return 移除的字段值