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("4fd59edbb9ac507e96276f1e"), "name": "Stephen1"}5. Array data query:--array-based lookups. > Db.test.find (){"_id": ObjectId ("4fd5a177b9ac507e96276f1f"), "fruit": ["apple", "banana", "Peach"]}{"_id": ObjectId ("4fd5a18cb9ac507e96276f20"), "fruit": ["apple", "kumquat", "Orange"]}{"_id": ObjectId ("4fd5a1f0b9ac507e96276f21"), "fruit": ["Cherry", "banana", "Apple"]} --all documents containing

Simple Factory: for example, if we want to collect apples and bananas, we need to create an Apple class and a Banana class, each of them has a collection method get (), which is then called through the main method. However, we find that both Apple and Banana have a collection get method, so we use the Fruit interface to abstract it, there is a get method in the interface, which is then implemented by the Ap

Http://mobile.51cto.com/ahot-419184.htmContent IntroductionWe'll add a layout scheme to the application project, in which the XML and Eclipse ADT interfaces will be the right helpers for the job-but some Java development knowledge will be used in the next two sections. XML and Java in the development of the Android platform is everywhere, if you do not have a basic understanding of the two, please find ways to fill up the lessons as soon as possible. For those who are just getting started, the k

hour or so, Miss Dong put the E-question a a three questions, no penalty. Looked at our school two teams are in the gold medal area, my school freshman's same level team also in the silver area, we also have the confidence to do the topic.The next is the dark moment. We looked at the front of the team a four questions, the heart is not happy, I took the B-question to knock. The idea is clear, that is, the fib is pushed forward from the back, less than n minus it with N, and then jump to continu

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, another command is used to deduplicate a record of data, which is enough for uniq. the uniq command removes repeated records from the data stream and leaves only the first record. it is often used in pipelines. for example, it is used for deduplication after the sort command. The uniq command mainly has three options:-c is used to display the count of duplicate rows,-d is used to display only duplicate rows, and-u is used to display only non-duplicate rows. [Houchangren @ ebsdi-23260-ooziedata

Php basic knowledge summary (1) array, basic knowledge array. Php basic knowledge summary (1) array, basic knowledge array 1, sorting 1, asort -- forward sorting, maintaining the index relationship 2, arsort -- reverse sorting, maintain the index relationship 3. sort-Summary from basic php knowledge (1) array, basic knowledge array I. sorting1. asort-positive sorting to maintain the index relationship2. arsort-reverse sorting to maintain the index relationship3. sort -- sorting from the lowest