mongo查询

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mongo通find来查找文档。可以执行精确匹配和模糊匹配。

1. 模糊匹配

1.1比较

> $gt , >= $gte, < $lt, <= $lte, != $ne

> db.tianyc02.find()
{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }
{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }
> db.tianyc02.find({age:{$lt:100}})
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }
> db.tianyc02.find({age:{$lt:100,$gt:20}})
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }
> db.tianyc02.find({age:{$ne:11}})
{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }
{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

1.2 $in & $nin

> db.tianyc02.find()
{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }
{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }
> db.tianyc02.find({age:{$in:[11,22]}})
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }
> db.tianyc02.find({age:{$nin:[11,22]}})
{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }
{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }

1.3 $or

> db.tianyc02.find({$or:[{age:11},{age:22}]})
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }
> db.tianyc02.find({$or:[{age:11},{name:'xttt'}]})
{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }
{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }

1.4 $not

> db.tianyc02.find({age:{$mod:[11,0]}})
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }
{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }
> db.tianyc02.find({age:{$not:{$mod:[11,0]}}})
{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }
{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }

$mod会将查询的值除以第一个给定的值,若余数等于第二个给定的值,则返回该结果。

$not与正则表达式联合使用时极为有效,用来查找那些与特定模式不匹配的文档。


2 Java使用代码()

@Testpublic void getChapterList() { Map<String ,Object> map = new LinkedHashMap<String, Object>(); map.put("result", new BasicDBObject("$ne", 1)); map.put("id", 2);
 //创建要查询的document BasicDBObject searchQuery = new BasicDBObject(map); DBCursor cursor = collection.find(searchQuery); //循环输出结果 while (cursor.hasNext()) { chapterFlowLogList.add(getEntityFromDBObject(cursor.next())); }
}



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