3. Mongodb

  • 3.17. MongoDB conditional operator

    3.17.1. Description ¶ The conditional operator is used to compare two expressions and get data from the mongoDB colle...
    2025-10-25 13:34:23 UTC
  • 3.18. MongoDB $type operator

    3.18.1. Description ¶ In this section, we will continue to discuss the conditional operator $type in MongoDB. The $...
    2025-10-25 13:34:24 UTC
  • 3.19. MongoDB Limit and Skip method

    3.19.1. MongoDB Limit() Method ¶ If you need to read a specified number of data records in MongoDB, you can use t...
    2025-10-25 13:34:23 UTC
  • 3.20. MongoDB sorting

    3.20.1. MongoDB sort() Method ¶ Use in MongoDB sort() Method to sort the data. The `` sort () `` meth...
    2025-10-25 13:34:24 UTC
  • 3.21. MongoDB index

    Indexes can usually greatly improve the efficiency of queries. If there is no index, MongoDB must scan each file in the coll...
    2025-10-25 13:34:22 UTC
  • 3.22. MongoDB aggregation

    Aggregate in MongoDB is mainly used to process data (such as statistical average, summation, etc.) and return the calculated...
    2025-10-25 13:34:21 UTC
  • 3.23. MongoDB replication (replica set)

    MongoDB replication is the process of synchronizing data on multiple servers. Replication provides redundant backup of dat...
    2025-10-25 13:34:25 UTC
  • 3.24. MongoDB fragmentation

    3.24.1. Slice ¶ There is another kind of cluster in Mongodb, that is, sharding technology, which can meet the needs o...
    2025-10-25 13:34:23 UTC
  • 3.25. MongoDB backup (mongodump) and recovery (mongorestore)

    3.25.1. MongoDB data backup ¶ In Mongodb, we use the mongodump command to back up MongoDB data. This command exports ...
    2025-10-25 13:34:21 UTC
  • 3.26. MongoDB monitoring

    After you have installed and deployed and allowed the MongoDB service, you must understand the operation of MongoDB and chec...
    2025-10-25 13:34:24 UTC
  • 3.27. MongoDB Java

    3.27.1. Environment configuration ¶ If you want to use MongoDB in the Java program, you need to make sure that the Ja...
    2025-10-25 13:34:22 UTC
  • 3.28. MongoDBPHP extension

    This tutorial will show you how to install MongoDB extensions on Linux, window, and Mac platforms. 3.28.1. Install the ...
    2025-10-25 13:34:23 UTC
  • 3.29. MongoDB PHP

    To use mongodb in php, you must use mongodb’s php driver. For the installation of MongoDB PHP on each platform and the dow...
    2025-10-25 13:34:22 UTC
  • 3.30. Installation and use of PHP7 MongDB

    This tutorial is only suitable for PHP7 environment. If you are in PHP5 environment, you can refer to the PHP MongDB 安装与使用 ...
    2025-10-25 13:34:24 UTC
  • 3.31. MongoDB relation

    The relationship of MongoDB represents the logical interrelation between multiple documents. Relationships can be establis...
    2025-10-25 13:34:24 UTC
  • 3.32. MongoDB database reference

    In the previous section of the MongoDB relationship, we mentioned the reference to MongoDB to standardize the data structure...
    2025-10-25 13:34:20 UTC
《地理信息系统原理、技术与方法》  97

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。