在软件系统的演进过程中，随着业务规模扩大和架构复杂度提升，数据访问层往往最先变得“失控”。 我们不仅要面对 多种数据库（关系型、文档型、图数据库、宽列存储等），还必须同时适应 多种查询模型： •SQL 的 JOIN•文档数据库的嵌套与投影•图数据库 ...

Which feature in SQL Server and Azure Synapse Analytics lets you run T-SQL queries against external data stores and makes those external sources appear as tables in a SQL database?

The Table API enables a programmatic way of developing, testing, and submitting Flink pipelines for processing data streams. Streams can be finite or infinite, with insert-only or changelog data. The ...

Abstract: NoSQL injection is a security vulnerability that allows attackers to interfere with an application’s queries to a NoSQL database. Such attacks can result in bypassing authentication ...

Generics make your code more flexible and easier to read, and they help you avoid ClassCastExceptions at runtime. Get started with this introduction to using generics with the Java Collections ...

Chemists achieve synthetic feat with radioactive promethium for the first time. “It’s a tour de force,” says Polly Arnold, a chemist at Lawrence Berkeley National Laboratory in Berkeley, California, ...

Based on the spirit of “Sports and Health” Teaching Reform Guidelines (Trial), this paper summarizes the experience and practice of table tennis Association in the teaching practice of large units, ...

Abstract: In several NoSQL database systems, among which is HBase, only one index is available for the tables, which is also the row key and the clustered index. Using other indexes does not come out ...

Kundera solves the classical Object-database impedance mismatch problem for NoSQL. Therefore, at a very basic level and for the sake of simplicity, it could be called as Object Mapper for NoSQL.

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