最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
MongoDB is a database based on distributed file storage. Written in C++ language. Designed to provide scalable high-performance data storage solutions for WEB applications.
MongoDB is a product between relational database and non-relational database, which is the most functional and most like relational database in non-relational database.
现在开始学习 MongoDB！ Introduces the basic concepts of NoSQL. Introduces the basic concepts of MongoDB. Describes how to install MongoDB on the window platform. Describes how to install MongoDB on the Linux platform. Introduce MongoDB database, object, collection application. Introduces the method of installing MongoDB extension in PHP. Describes MongoDB data insertion operations. Describes MongoDB update data operations. Describes MongoDB delete data operations. Describes MongoDB data query operations. Describes the use of MongoDB conditional operators. Describes the use of the MongoDB conditional operator $type. MongoDB official website address: https://www.mongodb.com/ MongoDB official English document: https://docs.mongodb.com/manual/ Download address for each platform of MongoDB: https://www.mongodb.com/download-center#community 3.1.1. Content list ¶
3.1.2. Reference address ¶