bean-searcher内嵌参数

@SearchBean(
    tables = ":table:"      // 参数 table 由检索时动态指定，这在分表检索时非常有用
)
public class Order {
    @DbField("id")
    private long id;
    @DbField("order_no")
    private String orderNo;
}

@SearchBean(
    tables = "student", 
    groupBy = ":groupBy:"           // 动态指定分组条件
)
public class StuAge {
    @DbField("avg(age)")
    private int avgAge;
}

@SearchBean(tables = "sutdent")
public class StuAge {
    @DbField(":field:")
    private String value;
}