Tags: log script obj name instance method body code MonGrammarThe syntax format for MongoDB query data is as follows:>db. Collection_name.find ()The Find () method displays all documents in an unstructured manner.If you need to read the data in an easy-to-read way, you can use the pretty () method, which has the following syntax:>db.col.find (). Pretty ()The pretty () method displays all documents in a form
. driver. login server. create (strconn); // obtain the database test‑database db = server. getDatabase (dbName); Users users = new Users (); users. name = "test"; users. sex = "man"; // obtain the Users set. If the database does not exist, create a collection col = db. getCollection ("Users"); // execute the insert operation col. insert
(Users );}
Update Data
Public void Update () {// create database link Login server = MongoDB. driver. logi
the document named Xin Lau, the following statements are correct.
However, if we suddenly want to add a middle field to this document, the above query statement will immediately become invalid. Because MongoDB exactly matches each field, what should we do? Specify fields explicitly
The above is a little new summary, and it seems that MongoDB is not difficult,
MongoDB query analysis ensures that our proposed indexes are valid and is an important tool for performance analysis of query statements.MongoDB query analysis commonly used functions are: explain () and hint ().
Using Explain ()Explain operations provide
Yesterday we learned about the Indexsearcher build process for Lucene search (http://blog.csdn.net/wuyinggui10000/article/details/45698667), Have a general understanding of Lucene's indexsearcher, know how to create indexsearcher, we should begin to learn to use Indexsearcher to index the search, In this section we learn the principles of indexing and the writing of tool classes that write indexed queries based on their related principles;Indexsearche
Mini tool: train ticket query, tool: train ticket
Today, when I got another train ticket, it was dumbfounded every time I grabbed the ticket. So I wrote a small tool to help myself query the train ticket. If there is a ticket, I will send myself an email asking me to buy it.
(Transferred from: http://www.cnblogs.com/zhuque/archive/2013/03/29/2988577.html)Mongostat is a state detection tool that is mongdb, and is used under the command line. It will take a fixed time to get the current running state of MongoDB and output. If you find that the database is suddenly slow or has other problems, your first-hand action is to consider using Mongostat to see the status of Mongo.Mongosta
Simple MySQL optimization tool-slow query and mysql optimization tool
Slow Query
First, enabling slow queries is a prerequisite regardless of the optimization. The slow query Mechanism records slow query statements (events) to pro
Mongosync, a data synchronization tool for MongoDB, introduces that mongosync is also an artifact for migrating data from MongoDB to TokuMX in real time. MongoDB Incremental Backup Tool mongobackup: the original address of MongoDBTokuMXsupport In the QQ group:
.log (7) Save the query to the Query_review table PT-query-digest--user=root–password=abc123--review h=localhost,d=test,t=query_review--create-review-Table Slow.log (8) Save the query to the Query_history table PT-query-digest--user=root–password=abc123--review H=localhost,d=test,t=query_ history--create-review-Table s
SummaryAccustomed to visualizing the way of managing data, by knocking commands, it's really uncomfortable. A MongoDB visualization tool is recommended here--robomongoRelated articlesGetting started with [MongoDB][MongoDB] additions and deletions change[Mongodb]count,gourp,d
The MongoDB query document uses the Find () method. The Find () method displays all documents in an unstructured manner.
Grammar
Db.collection.find (query, projection)
query: Optional, use the query operator to specify the query
Many applications now use MongoDB to store large amounts of business data, and MongoDB's document-based storage is common in the big data industry. MongoDB Client tools are also many, web-based but not much, domestic less, the following is a domestic Treesoft database management system, Java development, web-based tool software.1, directly online editing shell sc
Tags: libpcap mongodb mongosniffMongoDB Monitoring Tool MongosniffIntroducedMongosniff provides a low-level operational tracking and sniffing map of real-time database activity. Mongosniff can be thought of as custom-designed for MongoDB, similar to tcpdump for TCP/IP network traffic analysis. Mongosniff is often used to drive development.Note: Mongosniff require
System performance tuning in particular MySQL database tuning a primary basis is the slow query log. Originally there is a powerful tool on Ubantu or CentOS is Percona Toolkit, then how to use Pt-query-digest on Mac?Download Percona ToolkitAccess Http://www.percona.com/downloads/percona-toolkit, use source code installation, download the latest stable version of
year, I paid more attention to MongoDB and spent a lot of time on MongoDB management tools.
In a twinkling of an eye, the version has been upgraded to 1.2.4.
I don't know if Nosql has a future. This tool is for C # exercises.
The work unit cannot write C #, but can only write C # in spare time.
GitHub cannot be used for downloading. Therefore, the latest version
Php7 How to implement MongoDB fuzzy query? MongoDB Fuzzy query statement believe that everyone is not unfamiliar, this article mainly introduces in PHP 7 MongoDB implementation of Fuzzy Query method, the text gives a detailed intr
Introduction to MongoDB and addition, deletion, modification, and query
I. Introduction
MongoDB is written in C ++ and is an open source database system based on distributed file storage. MongoDB is designed to provide scalable, high-performance data storage solutions for WEB applications.
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