Tag：Data sheet
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Time：2021-6-18
introduce In the development of background interface, now more enterprises choosePHPTo develop the background interfacePythonandNodeJsIt’s a good choice But here we arePHPFor example, based onLaravelFramework development backgroundAPIHere is also if you are engaged in other directions and want to do some backstage workAPIDevelopment can try Of course, I won’t put the example project on my […]
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Time：2021-6-16
explain: The content in < > is self defined The contents in [] can be omitted Field contains the field name and data type_ Name only refers to the field name table_ Name refers to the name of the table Position refers to the position of the field, and the values can be: first, after […]
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Time：2021-6-15
Stream data refers to dynamic data that grows continuously over time. The operation data of Internet and sensor data of Internet of things belong to the category of streaming data. The characteristics of stream data determine that its data set is dynamic. The traditional static data table oriented computing engine is not competent for the […]
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Time：2021-6-11
Author: Yang Jie brief introduction PostgreSQL FDW is an external access interface, which can be used to access the data stored outside. The data can be external PG database, mysql, Clickhouse and other databases. Clickhouse is a fast open source OLAP database management system. It is column oriented and allows SQL queries to generate analysis […]
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Time：2021-6-8
Introduction: the important goal of disaster recovery system is to ensure the “continuity” of system data and services. When the system fails, the disaster recovery system can quickly restore service and ensure the validity of data. In order to prevent natural and man-made disasters, force majeure, in the city or other places to establish the […]
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Time：2021-6-7
1、 Framework Framework is produced to deal with a certain kind of software design problems, it is composed of various software modules, each module has a specific function, and the software development is completed by the cooperation between modules. 2、 MVC framework Introduction to MVC MVC concept: Division of labor, let special people do special […]
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Time：2021-6-1
preface Before I wrote an article about how to write less PHP “bad” codehttps://segmentfault.com/a/11…I feel that many new people don’t understand this. Today, take the clock out function as an example to explain the mystery. There are several types of code development in that article. The demand of addition, deletion and modification Route -> Controller […]
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Time：2021-5-11
Why Before the official start, Cai Cai should emphasize that whether your data table should be divided needs to consider many factors, such as whether the amount of business data has reached the order of magnitude that must be divided, and whether there are other solutions to solve the current problems? I have seen more […]
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Time：2021-5-8
Real time stream processing is to collect the data generated by the business system in real time, and then send it to the stream processing framework for data cleaning, statistics, storage, and real-time display of statistical results through visualization. The traditional static data table oriented computing engine is not competent for the analysis and computing […]
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Time：2021-5-7
About clustered index For a data table without a primary key, the data is stored in the memory row by row in disorder. If a primary key is added, that is, a clustered index, it will become a balanced tree. The structure of the whole data table will change from an unordered table to a […]
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Time：2021-5-4
database Standard librarydatabase/sqlThe interface and specification of database operation, such as connection pool management, data binding, transaction processing, have been encapsulated in. But for the concretedatabaseThe type needs to be driven by a third party, ifmysql sqliteAnd so on. load Var DB * sql.db / / declare database operation variablesFunc initdb() {} / / initialization […]
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Time：2021-5-3
demand aboutoracleDatabase,jpaOfEntityEven if comments are [email protected] (columndefinition =’column comment ‘), unable to generate comments for columns in the database tier Solution User defined annotation, configured inEntityClass, when the project is initialized, theEntityManagerGet all the entity classes, traverse whether the annotation is configured in the entity class, if so, dynamically spliceDDLStatement and execute Custom annotation: import […]
