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What is Room? Room is a framework library covering SQLite abstraction layer specially provided by Google to simplify old-fashioned SQLite operations Room is also an ORM framework. It provides an abstraction layer on SQLite, shields some underlying details, and uses objects to operate the database. CRUD is as simple as calling methods with obje ...

Due to the needs of work and business, the author has developed a set of freshman enrollment identity verification system, which is used to verify the identity of Freshmen in real time when they enter school (the Ministry of education requires freshmen to conduct face comparison when they enter school), and count the check-in situation of Fresh ...

What is SQL SQL (structured query language): structured query languageSQL is a language for defining and operating data in relational databaseSQL language is simple and grammar is simple, easy to learn and use Common relational database PC side: Oracle, MySQL, SQL Server, Access, DB2, Sybase Embedded \ mobile client: SQLite sqlite lightweight ...

1, Introduction to Django framework Refer to official documents: Django official documents https://docs.djangoproject.com/zh-hans/3.2/ 2, Create the first Django project Create a new project - > select Django Django will be installed automatically If the network speed is too slow, you need to modify the pip source Modify pip sour ...

What are you doing recently Android Application development, IDE yes android studio , The version configuration used is as follows: compileSdk 32 buildToolsVersion '32.0.0' defaultConfig { applicationId "com.example.gzpersonmanager" minSdk 21 targetSdk 32 versionCode 1 versionName "1.0" testInstrumentationRunner "andr ...

poll function poll is a function in the character device driver in Linux. poll is essentially no different from select. It copies the array passed in by the user to the kernel space, and then queries the device status corresponding to each fd. If the device is ready, add an item to the device waiting queue and continue to traverse. If no r ...

In the process of development, we often encounter the form of storing files in the database. The common method is to upload files to the server. The database only needs to save the file path address. However, many internal window applications are not linked to the network and are local running services. At this time, we need to use another form ...

reference resources SQLite official website SQL As Understood By SQLite System.Data.SQLite Rookie tutorial chapter 1, Download and install During this period of time, when learning C# programming, I wanted to write a simple purchase, sales and inventory program, so I thought of using the database. I need a simple and portable desktop database ...

Overview of relational database Relational Database RDB (Relational Database) is a database that manages data based on relational model. Based on SQLite components, HarmonyOS Relational Database provides a complete set of management mechanism for local database, and provides a series of add, delete, modify, query and other interfaces. It can a ...

background Recently, the main application scenario for the function of persisting vector data to Spatialite database is to request vector data in a certain range from db in real time, obtain its information (point set, style and field), present it on the map, or carry out vector information processing related businesses through the RTree ...