h2

I am using Liquibase in my Spring web application. I have a bunch of entities with hundreds of tests for REST APIs in the integration tests for each entity like User, Account, Invoice, License etc. All of my integration tests pass when run by class but a lot of them fail when ran together using gradle test . It is very likely there is data collision between the tests and I am not interested in spending time to fix clean up data as of now. I prefer dropping the DB and context after every class. I figured I could use @DirtiesContext at class and so I annotated by test with it. @RunWith

Wikipedia describes the Phantom read phenomenon as: A phantom read occurs when, in the course of a transaction, two identical queries are executed, and the collection of rows returned by the second query is different from the first. It also states that with serializable isolation level, Phantom reads are not possible. I'm trying to make sure it is so in H2, but either I expect the wrong thing, or I do a wrong thing, or something is wrong with H2. Nevertheless, here's the code: try(Connection connection1 = DriverManager.getConnection(JDBC_URL, JDBC_USER, JDBC_PASSWORD)) { connection1

I want to create a simple webapp that allow remote clients to track some content on a post request persist all the tracking in a lightweight database give back all the tracking on a get request About the database, I would like put its location within a properties file of my webapp (and use this location for hibernate.location.url set in persistence.xml) that the database is created with schema and table if they do not exist yet use the existing database and schema and table and data if they exist So I created a maven project with: pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0"

Trying to use a UUID as my id for PostgreSQL and H2, the current exceptions are for H2 java.lang.IllegalArgumentException: Can not set java.util.UUID field com.lm.model.Task.id to java.lang.String at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81) at java.lang.reflect.Field.set(Field.java:758) at org.hibernate.property.DirectPropertyAccessor

近期鼓捣自己的几个网站做流量分析和seo、搜索排名研究，收集了一些seo文章，近期将做些总结： 之前 写了一篇百度霸屏实操分享 ，关于SEO因为太多知识点，集合性文章写不完，所以单独出一篇文章。关于SEO太多的人拥有不同的理解，这篇文章也是出于我个人对SEO的理解，希望对大家有帮助。 SEO发展至今，我认为已经跨越了很多个时代了，之前的就不多讲，大家可以 百度 ，目前已经是用户体验的时代了，想做好SEO，也就是想有好的排名，必然要从用户体验出发，做好每一个网站细节，才能留住用户，留住用户，你的排名就不会低。 做SEO前，你需要理解，流量和排名不是一下子就来的，没有耐心我规劝你不要做SEO。 因为没有任何一个SEO可以保证流量和排名，流量和排名是一步一步来的，有收录才有排名，有排名才会有流量，但是其中很多不确定因素。 同行竞争，外链，包括公司放长假，也都会影响收录以及排名，最终影响流量，所以我规劝等不及的大哥们，可以考虑百度竞价，砸钱就有排名。 要做SEO之前，你需要的是确定想法，也就是确定关键词，关键词在SEO中的作用，可谓决生死。关键词即你的网络人生方向，选好关键词，对你的网站帮助不止一点点，这里分享一些个人选关键词的经验。 1、百度指数 百度搜索百度指数 登入可以查看关键词的指数，指数的意思即每日有多少人点击这个关键词。 拿自媒体为例： 近七日，这个关键词指数将近4500

I have configured my H2 database as follows: @Configuration @Profile({ Profiles.DEV }) public class DevDataSourceConfiguration { @Bean(initMethod = "start", destroyMethod = "stop") public Server h2WebServer() throws SQLException { return Server.createWebServer("-web", "-webAllowOthers", "-webPort", "8082"); } @Bean(initMethod = "start", destroyMethod = "stop") @DependsOn("h2WebServer") public Server h2Server() throws SQLException { return Server.createTcpServer("-tcp", "-tcpAllowOthers", "-tcpPort", "9092"); } @Bean @DependsOn("h2Server") public DataSource datasource() { HikariDataSource ds =

I'm trying to get values from h2 db, but always getting this error org.h2.jdbc.JdbcSQLException: No data is available [2000-171] at org.h2.message.DbException.getJdbcSQLException(DbException.java:329) at org.h2.message.DbException.get(DbException.java:169) at org.h2.message.DbException.get(DbException.java:146) at org.h2.message.DbException.get(DbException.java:135) at org.h2.jdbc.JdbcResultSet.checkOnValidRow(JdbcResultSet.java:2956) at org.h2.jdbc.JdbcResultSet.get(JdbcResultSet.java:2962) at org.h2.jdbc.JdbcResultSet.getInt(JdbcResultSet.java:306) I googled for an answer Make sure to call

目前计算机视觉（CV）与自然语言处理（NLP）及语音识别并列为人工智能三大热点方向，而计算机视觉中的对象检测(objectdetection)应用非常广泛，比如自动驾驶、视频监控、工业质检、医疗诊断等场景。 目标检测的根本任务就是将图片或者视频中感兴趣的目标提取出来，目标的识别可以基于颜色、纹理、形状。其中颜色属性运用十分广泛，也比较容易实现。下面就向大家分享一个我做的小实验———通过OpenCV的Python接口来实现从视频中进行颜色识别和跟踪。 下面就是我们完整的代码实现（已调试运行）： import numpy as np import cv2 font = cv2.FONT_HERSHEY_SIMPLEX lower_green = np.array([35, 110, 106]) # 绿色范围低阈值 upper_green = np.array([77, 255, 255]) # 绿色范围高阈值 lower_red = np.array([0, 127, 128]) # 红色范围低阈值 upper_red = np.array([10, 255, 255]) # 红色范围高阈值 #需要更多颜色，可以去百度一下HSV阈值！ # cap = cv2.VideoCapture('1.mp4') # 打开视频文件 cap = cv2.VideoCapture(0)