h2

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm working with Hibernate. How can I configure my persistence.xml to have an H2 in-memory database? My persistence.xml is: <?xml version="1.0" encoding="UTF-8" ?> <persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"> <persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL"> <class>com.mastertheboss.domain.Employee</class> <class>com

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have an init script for my MySQL database but for test purposes I wan't to use a H2 database. Anyone knows how to convert the file or at least has a list of the syntax differences ? thanks. 回答1: There are a number of database tools that help migrating data from one to another database, for example: Flyway SQuirreL DB Copy Plugin 回答2: Here is a good instruction by Matthew Casperson Exporting from MySQL to H2 Here is a short list of steps, to convert from mysql to h2: Fix up single quotes CREATE TABLE `user` ( `name` varchar(20) NOT NULL,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: This is related to this post . I think I am having problem with H2 meaning that it does not close properly. I suspect this since I see myDB.lock.db when I shutdown tomcat and the process does not stop. I use Tomcat's connection pooling and the url to the database is: url="jdbc:h2:file:/opt/myOrg/tomcat/webapps/MyApplication/db/myDatabase;SCHEMA=myschema" From the doc close H2 : Usually, a database is closed when the last connection to it is closed.... By default, a database is closed when the last connection is closed. However, if

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: How to start H2 database in server mode. I need to start it from my application.I tried the following code: server = Server.createTcpServer().start(); Here is the properties for the connection: javabase.jdbc.url = jdbc:h2:tcp://localhost:9092/nio:~/source/db/database/db;AUTO_SERVER=TRUE javabase.jdbc.driver = org.h2.Driver javabase.jdbc.username = sa javabase.jdbc.password = When I run the program I got the following error: client.db.exception.DAOException: org.h2.jdbc.JdbcSQLException: Database may be already in use: "Locked by another

I am working a java application using H2 Database in embedded mode. My Application consumes 150mb of heap memory. Problem: Steps When I load H2 database with 2 mb of data, database access is fast and heap memory size 160mb. But When I load H2 database with 30 mb of data(h2 db file size =30 mb). Then accessing the database from my application is very slow. the reason being my application heap size is hugely grown to 300mb of size hence degraded performance. I confirmed using JConsole. So my understanding is since H2 database is developed using java and since I am using H2 database in embedded

React.Component render() JSX class Clock extends React.Component { // render函数表示渲染，每次重新渲染都要调用该函数 render(){ return ( <div> <h2>Clock, {this.props.name}</h2> </div> ); } } state UI state super(props) class Clock extends React.Component { constructor(props){ //props形参在构造器中，和函数组件不一样 super(props); this.state = { now:new Date().toLocaleString() } } } state 1state this.setState() 2State setState state componentDidMount setState componentWillUnmount 'onXxx' this render() this es6 this 为 undefined this this

I'm trying to access my application's tables in Play! Framework, but I can't find it using the console. For instance, I have two entity models: Address and Campus . I can create objects and save normally, but I would like to see the changes in fs or mem DB, but the H2 console doesn't show the tables Address and Campus . I'm using the default settings to log in localhost:9000/@db . What am I doing wrong? Thanks in advance. Juan Ramón Paniagua The correct URL for the inmemory database is: jdbc:h2:mem:name-of-your-play-db Steps I took to get a filesystem H2 database console working where my app

场景一：List<Long> 或其他泛型，非对象 List<Long> ids = new ArrayList(); ids.add(100000001L); ids.add(100000011L); ids.add(100000201L); ids.add(100000091L); ids.add(100000021L); ids.add(100000006L); //升序 ids.sort((h1, h2) -> h1.compareTo(h2)); //降序 ids.sort((h1, h2) -> h2.compareTo(h1));