h2 | 易学教程

How can solve JSON column in H2

阅读更多关于 How can solve JSON column in H2

问题 I use in application MySQL 5.7 and I have JSON columns. When I try running my integration tests don't work because the H2 database can't create the table. This is the error: 2016-09-21 16:35:29.729 ERROR 10981 --- [ main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000389: Unsuccessful: create table payment_transaction (id bigint generated by default as identity, creation_date timestamp not null, payload json, period integer, public_id varchar(255) not null, state varchar(255) not null,

File based h2 persisted but not loaded in Spring Boot

阅读更多关于 File based h2 persisted but not loaded in Spring Boot

I made a small application based on Spring Boot: spring-boot-starter-web spring-boot-starter-data-jpa The application has simply one domain class Post.java . Accordingly there is a RestController and a DAO. The data is supposed to be persisted in a file based hsql db. When the application is running everything seems fine. Data is stored. The h2 file is created and contains insert statements. However, when I kill the application and start it a second time. No data is loaded. (As if a brand new db file was created, which overwrote the old one). application.properties spring.datasource.url = jdbc

MyBatis how can I generate different sql for different database backend

阅读更多关于 MyBatis how can I generate different sql for different database backend

I'm using mybatis-spring 1.2.3 together with Spring4 to create a web application. The main data storage is MySQL in production environment, but I also use in-memory database H2 in unit testing. MyBatis works well with both of MySQL and H2 in testing and production, but I come across a problem that one day I need to use force index(idx1) in a query to MySQL, which will cause a syntax error in unit testing as H2 hasn't supported force index . As the result, the unit testing is totally broken. I want to know is there any way that MyBatis can handle such a situation? (type of database differs in

Set default timezone H2 database

阅读更多关于 Set default timezone H2 database

How can I explicitly set the time zone H2 should use? Now it gets the timezone to use from the underlying OS. I would assume there existed an extra parameter I would add to the connection string ala the one I have below. db.url=jdbc:h2:mem:mybipper;MVCC=true;<timezone=UTC> Apparently you don't have a parameter on the connection but the database will use the timezone of the JVM where the driver is loaded so you can set -Duser.timezone=UTC . Note that you can't change the timezone after the driver has been loaded. You can manipulate the JVM time zone, before interacting with the database:

H2 - How to create a database trigger that log a row change to another table?

阅读更多关于 H2 - How to create a database trigger that log a row change to another table?

问题 How to create a database trigger that log a row change to another table in H2? In MySQL, this can be done easily: CREATE TRIGGER `trigger` BEFORE UPDATE ON `table` FOR EACH ROW BEGIN INSERT INTO `log` ( `field1` `field2`, ... ) VALUES ( NEW.`field1`, NEW.`field2`, ... ) ; END; 回答1: Declare this trigger: CREATE TRIGGER my_trigger BEFORE UPDATE ON my_table FOR EACH ROW CALL "com.example.MyTrigger" Implementing the trigger with Java/JDBC: public class MyTrigger implements Trigger { @Override

Why does the H2 console in Spring Boot show a blank screen after logging in?

阅读更多关于 Why does the H2 console in Spring Boot show a blank screen after logging in?

问题 I'm using Spring Boot 1.4.1 with the H2 database. I have enabled the H2 console as described in the reference guide by adding the following lines to my application.properties file: spring.h2.console.enabled=true spring.h2.console.path=/h2 When I go to the H2 console in Chrome 53 for Windows, I can see the login page and clicking the "Test Connection" button results in "Test successful": But when I click on the "Connect" button, the screen turns completely blank. When I view the source, I see

How to use a persistent H2 database in the Play Framework instead of in-memory

阅读更多关于 How to use a persistent H2 database in the Play Framework instead of in-memory

问题 The H2 database used in the Java Todo List tutorial is the following: db.default.driver=org.h2.Driver db.default.url="jdbc:h2:mem:play" How do I modify the configuration file to use a persistent database as opposed to an in-memory version. Do I need to setup an entirely separate DB or can I modify the db.default.url property? I'm using Play! 2.0.3. 回答1: I found the solution. To create a file database, modify the following: From db.default.url="jdbc:h2:mem:play" To db.default.url="jdbc:h2:file

米联客 ZYNQ/SOC 精品教程 S02-CH15 AXI_Lite 总线详解

阅读更多关于米联客 ZYNQ/SOC 精品教程 S02-CH15 AXI_Lite 总线详解

软件版本：VIVADO2017.4 操作系统：WIN10 64bit 硬件平台：适用米联客 ZYNQ系列开发板米联客(MSXBO)论坛： www.osrc.cn 答疑解惑专栏开通，欢迎大家给我提问！！ 15.1 概述 ZYNQ拥有ARM+FPGA这个神奇的架构，ARM和FPGA通过AXI4总线进行通信。本章对AXI总线源码进行分析，首先对总线和接口以及协议进行区别，其次通过分析AXI4-Lite，AXI4-Stream，AXI4总线的从机代码，进一步认识AXI协议，那么在后面学习AXI接口的IP时就不会有恐惧的心理。这里需要特别说明一下AXI总线和AXI接口的关系。在ZYNQ中，支持AXI4-Lite，AXI4和AXI4-Stream三种总线协议，需要注意的是PS与PL之间的接口（AXI-GP接口，AXI-HP接口以及AXI-ACP接口）只支持AXI-Lite和AXI协议这两种总线协议。也就是说PL这边的AXI-Stream的接口是不能直接与PS对接的，需要经过AXI4或者AXI4-Lite的转换。比如后面将用到的VDMA IP ，它就实现了在PL内部AXI4到AXI-Stream的转换，VDMA利用的接口就是AXI-HP接口。 15.2 AXI总线与ZYNQ的关系 AXI（Advanced eXtensible Interface）本是由ARM公司提出的一种总线协议

Schema related problems with Flyway / Spring and H2 embedded database

阅读更多关于 Schema related problems with Flyway / Spring and H2 embedded database

I am building a Spring 3 MVC app that uses a MySQL database and have recently integrated Flyway into the solution to manage the database migrations. I have successfully configured my applicationContext.xml according to the Flyway documentation such that, upon application startup, Flyway will migrate to the latest version. I am having trouble getting Flyway to play nicely with my unit / functional tests. I am using Spring Data JPA for my data access layer and have built some JUnit tests to test some custom queries. The application config I use for these tests is: <jdbc:embedded-database id=

HTML和CSS网页开发基础

阅读更多关于 HTML和CSS网页开发基础

本文转载于: 猿2048 网站 HTML和CSS网页开发基础一 HTML文档结构 HTML文档结构：<html>、<head>、<title>、<body>构成HTML页面中最基本的元素。 HTML常用标记：1.换行标记 <br> 2.段落标记 <p> </p> 3.标题标记 <h1>~<h6> 数字越小，级别越高。 4.居中标记 <center>需居中内容</center> 5.文字列表标记有序<ol>无序<ul> 二表格标记 1. 表格标记 <table> : <table>标记中有很多属性，如width设置表格的宽度，border设置表格的边框，align设置表格的对齐方式，bgcolor设置背景颜色。 2.标题标记 <caption> 3.表头标记 <th> 4.表格行标记 <tr> :以<tr>开头</tr>结尾，一组<tr>表示表格中的一行。但<tr>必须嵌套在<table>标记中使用。 5.单元格标记又叫列标记 <td> :一个<tr>可以嵌套若干个<td> 三 HTML表单标记 1. <form>..</form>表单标记定义处理表单数据程序的URL地址信息等，基本语法格式： <form action="url"mathod="get"|"post"name="name"onsubmit="单击提交触发事件"target="_self/_blank/

订阅 h2