//
查parententity = db.findbyid(parent.class, parent.getid());
parententity = db.findfirst(entity);//通過entity的屬性查詢
listlist = db.findall(entity);//通過entity的屬性查詢
listlist = db.findall(parent.class);//通過型別查詢
parentparent =db.findfirst(selector.from(parent.class).where("name","=","test"));
//is null
parentparent = db.findfirst(selector.from(parent.class).where("name","=",null));
//is not null
parentparent = db.findfirst(selector.from(parent.class).where("name","!=",null));
//where id<54 and (age>20 or age<30) order by id limitpagesize offset pageoffset
listlist = db.findall(selector.from(parent.class)
.where("id","<", 54)
.and(wherebuilder.b("age",">", 20).or("age", " < ", 30))
.orderby("id")
.limit(pagesize)
.offset(pagesize* pageindex));
//op為"in"時，最後乙個引數必須是陣列或iterable的實現類(例如list等)
parenttest = db.findfirst(selector.from(parent.class).where("id","in", new int));
//op為"between"時，最後乙個引數必須是陣列或iterable的實現類(例如list等)
parenttest = db.findfirst(selector.from(parent.class).where("id","between", new string));
dbmodeldbmodel =db.finddbmodelall(selector.from(parent.class).select("name"));//select("name")只取出name列
listdbmodels =db.finddbmodelall(selector.from(parent.class).groupby("name").select("name","count(name)"));
...listdbmodels = db.finddbmodelall(sql); // 自定義sql查詢
db.execnonquery(sql)// 執行自定義sql
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