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preface 🦁 entity+Dao Model - very important Dao-Table name Dao-Add, delete, modify and query a table - it will be simplified into an interface later entity-Corresponding to the entity table in the database (table name, attribute, method) 🐅IDEA Bring your own Database JDBC Foundation (1) JDBC principle JDBC (Java Database Conne ...

catalogue Spring circular dependency What is circular dependency? Under what circumstances can circular dependencies be handled? Basic introduction and the essence of circular dependency what？ The essence of the problem is actually two sum! How to get to getSingleton method Simple circular dependency (no AOP) Call getSingleton(beanName ...

Project introduction and cryptography knowledge Overall structure of the project: Main function: encrypt and decrypt the data of network communication Basic components: Data serialization: protobufsocket communication: thread pool, connection poolShared memory IPCoracle Database: using OCI interfaceData encryption: openssl (Secure Sockets ...

lock_guard Class lock_guard is a mutex wrapper that provides a convenient RAII style mechanism for occupying mutexes during scope blocks. Create lock_ When the guard object, it attempts to receive ownership of the given mutex. Control leave create lock_ Destroy lock when the scope of the guard object_ Guard and release mutex. lock_ The guard c ...

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As we all know, the size of cache is limited! When the cache is full, it requires a cache elimination strategy to determine which data should be cleaned out. There are three common strategies: First In, First Out (FIFO), Least Frequently Used (LFU) and Least Recently Used (LRU). Take a look at this LRU design question on LeetCode: 1.Please de ...

Initial DataGridView The DataGridView control provides a powerful and flexible way to display data in tabular form. Users can use the DataGridView control to display a read-only view of a small amount of data, or they can align and zoom to display a markable view of a large dataset.There are many ways to extend the DataView control. For exampl ...

Component introduction Node Exporter node_exporter is the general name of a kind of data acquisition components. Exporter is responsible for collecting data from the target and converting it into the format supported by Prometheus. It opens an http interface (so that Prometheus can grab data) Different from the traditional data collection com ...

The horizontal layout and the vertical layout of cistrant Android are very familiar. Does it seem that the horizontal layout and the vertical layout of cistrant Android are well aligned? In fact, it is an upgraded version of the relative layout, layout_contrainTop_toBottomof: in fact, the upper edge of the current component is aligned wit ...

Flash database relatedDatabase typeSQL and NoSQL.SQL database stores structured data in an efficient and compact way, which requires a lot of energy to ensure data consistency.NoSQL database relaxes the requirements for consistency, so as to obtain performance advantages.ORMDatabase engine and database abstraction layer.Object relational mapper ...