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What is flow operation The Java 8 API adds a new abstraction called streaming Stream, which allows you to process data in a declarative way. Stream provides a high-level abstraction of Java set operations and expressions in an intuitive way similar to querying data from a database using SQL statements. Stream API can greatly improve ...

How to solve this problem? What is' IndexDB '? What is homology strategy? What is cross domain? How to solve this problem? jsonp node backend code Native implementation (add script tag) $.ajax implementation vue is implemented by vue jsonp Cross domain resource sharing (CORS) node backend code Na ...

In this paper, the actual example in CentOS 7.2 is used to illustrate how to store the relevant MQTT data through MySQL MySQL is a traditional relational database product. Its open architecture makes users highly selective. With the gradual maturity of technology, MySQL supports more and more functions, ...

1. The way of separating read from write in MySQL There are several ways for mysql to achieve read-write separation: The program modifies mysql operation, communicates with database directly, realizes load balance in a simple and quick way with separation of reading and writing and random way, and di ...

Article directory 1. Design stage 1.1 demand analysis 1.2 function diagram of address book management system 1.3 use case diagram of address book management system 1.4 E-R diagram of address book management system 2. Database design 3. Program design 2.1function 2.1.1 design ContactPerson class 2 ...

Introduction: The Java 8 API adds a new abstraction called Stream, which allows you to process data in a declarative way, under the java.util.stream package. Stream provides a high-level abstraction of Java set operations and expressions in an intuitive way similar to querying data from a database ...

What is partition table Partition is to decompose a table into smaller and more manageable parts according to certain rules. Logically, there is only one table, but in fact, the table may be composed of N physical partition objects. Each partition is an independent object, which can be processed independently and as a part of the table. Smal ...

We start from six aspects: plug-in configuration, plug-in writing, plug-in operation principle, plug-in registration and interception time, initialization plug-in, paging plug-in principle. 1. Plug in configuration Mybatis plug-ins are configured in the configuration. During initialization, these plug ...

waterdrop filters and processes log files to store data Installing waterdrop Download the installation package of waterdrop using wget wget xxxxx Extract to the directory you need Unzip XXX (package location) XXX (decompression location) If unzip reports an error, please download the corresponding command yourself. Set the dependency env ...

What is a benchmark When we optimize the database, we only know if the optimization is effective by measuring the performance of the system. This measurement is benchmarking.Benchmark tests are defined as follows: Benchmarking is the activity of measuring and evaluating software performance indicators to establish a performance benchmark at a ...