Start using Spring Data JPA

Since we have just released the first milestone of the Spring Data JPA project, I would like to give you a brief introduction to its functionality. As you may know, the Spring framework provides support for building a data access layer based on JPA. So what does Spring Data JPA add to this basic support? To answer this que ...

Posted by CreativeWebDsign on Fri, 10 May 2019 18:54:01 +0200

Graphql combat series

Former love introduction stay Graphql Series of Actual Warfare (Part I) We have completed the technical selection and bridged the graphql Gel gels In the project, and dynamic handwritten schema, through http://localhost 5000/graphql view effect. In this section, we automatically generate the basic query and update schema according to the databa ...

Posted by bird_man11 on Fri, 10 May 2019 09:00:20 +0200

Simple use of Mybatis framework

1. Configuration process 1. Process diagrams (implemented through XML mapping files): 2. Process: 2.1 Import package: 2.1.1 Download Package Database Driven Package (this article takes MySQL as an example): https://mvnrepository.com/artifact/mysql/mysql-connector-java Mybatis Framework Package: https://mvnrepository.com/artifact/org.myb ...

Posted by VK4KBG on Fri, 10 May 2019 03:06:03 +0200

Application of Ajax

A Brief Introduction to the Use of Ajax Asynchronous Technology Ajax introduction Introduction of Development Environment Technical Code Implementation Last but not least: Ajax introduction Ajax uses asynchronous data transmission (HTTP requests) between browsers and Web servers, which enables Web pages to request a ...

Posted by tonbah on Thu, 09 May 2019 21:28:03 +0200

Tutorial: How to Realize Data File Format Conversion through DLA

Preface Data Lake Analytic DLA (hereinafter referred to as DLA) can help users directly query and analyze data stored on OSS and TableStore through standard SQL statements. For the same data, it is not only different in storage space, but also different in execution time when using DLA query. Generally speaking, when data of the same size is st ...

Posted by growler123 on Thu, 09 May 2019 17:50:03 +0200

Introduction and Operation of MySQL View

1. Preparations Create two tables balance (balance table) and customer (customer table) in MySQL database and insert data. create table customer( id int(10) primary key, name char(20) not null, role char(20) not null, phone char(20) not null, sex char(10) not null, address char(50) not null )ENGINE=InnoDB DEFAULT CHARSET ...

Posted by shaunrigby on Thu, 09 May 2019 05:42:03 +0200

Basic knowledge of Java ——JDBC

Author: Nobody Source: CSDN Original text: https://blog.csdn.net/h1025372645/article/details/89191301 JDBC Java DataBase Connectivity,java database connection, in order to reduce the difficulty of operating data, java provides jdbc, according to the characteristics of java object-oriented, many operations are encapsulated. JDBC ...

Posted by arctushar on Wed, 08 May 2019 21:57:03 +0200

Constructing an application dApp of Etherfang+IPFS+React.js

Why do we build this? It is very expensive to store a large amount of data on the block chain of Taifang. According to the Yellow Paper of ETF, it is about 20,000 gas, 256 bit/8 bytes (1 word). Based on 02/28/2018 gas price is 4 gwei/gas. Please refer to: https://ethgasstation.info Know the current price. Each transaction has 8 bytes of 20,000 ...

Posted by thepreacher on Wed, 08 May 2019 18:00:02 +0200

[Reload, Organize] Turn on archive mode, archive log is full

At ORACLE10g and 11g versions, the default log archive path for ORACLE is the flash-back recovery area ($ORACLE_BASE/flash_recovery_area).ORACLE has a limitation on this path: it only has 2G of space by default, and it is not only the default path for archive logs, but also the default address for backup files and flash back lo ...

Posted by maheshb on Wed, 08 May 2019 04:35:03 +0200

NEO400J Level Full-Text Index Construction Optimization

NEO400J Level Full-Text Index Construction Optimization 1. Scale of data volume (level 100 million) 2. Ways to Build Indexes 3. Exceptions Occurring in Index Building IV. Code optimization for full-text index 1,Java.lang.OutOfMemoryError 2. When accessing a database 3. Optimizing scheme 4. Optimize Code 5. Perform efficiency ...

Posted by lisa007 on Tue, 07 May 2019 12:10:06 +0200