h2

问题 I was trying to add an field to my entity as a CLOB. When using the JHipster CLI it was no problem to add it. Now, when i trying to start my application i get the following validation error from liquibase: liquibase.exception.ValidationFailedException: Validation Failed: 1 change sets check sum config/liquibase/changelog/20170221193921_xxxxxxxx.xml::20170221193921-1::jhipster was: 7:d8b3f42d8d4d523c7b14f93b4c7657c7 but is now: 7:a2a365179a0d231c2771ebd79f51b1fc i also tried the following: .

问题 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

问题 I'm trying to make a connection from python2.7 to H2 (h2-1.4.193.jar - latest) H2 (is running and available): java -Dh2.bindAddress=127.0.0.1 -cp "E:\Dir\h2-1.4.193.jar;%H2DRIVERS%;%CLASSPATH%" org.h2.tools.Server -tcpPort 15081 -baseDir E:\Dir\db For python I'm using jaydebeapi : import jaydebeapi conn = jaydebeapi.connect('org.h2.Driver', ['jdbc:h2:tcp://localhost:15081/db/test', 'sa', ''], 'E:\Path\to\h2-1.4.193.jar') curs = conn.cursor() curs.execute('create table PERSON ("PERSON_ID"

问题 Is it possible to start up and shut down multiple H2 databases within a JVM? My goal is to support multi-tenancy by giving each user/account their own database. Each account has very little data. Data between the accounts is never accessed together, compared, or grouped; each account is entirely separate from the others. Each account is only accessed briefly once a day or a few times a month. So there are few upsides to housing the data together in a single database, and some serious

问题 in my Java project I am using an H2 in-memory database, for which I have to load the JDBC driver when I initialize my application. I want/need to load the H2 .jar file dynamically, so I do the following: String classname = "org.h2.Driver"; URL u = new URL("jar:file:libs/h2.jar!/"); URLClassLoader ucl = new URLClassLoader(new URL[] { u }); Driver d = (Driver) Class.forName(classname, true, ucl).newInstance(); DriverManager.registerDriver(new DriverShim(d)); When I put the H2 .jar file into a

问题 We want a simple unit test that runs multiple threads - the idea is that the main thread commits a save to the database, then waits for a secondary thread to pick it up. We're finding that the transaction has to be committed for the second Thread to be able to query the database and find the item. Otherwise, it won't exist. We're trying to accomplish this using an H2 database, Hibernate to manage the access, and the unit test extends AbstractTransactionalJUnit4SpringContextTests . When we try

问题 We want a simple unit test that runs multiple threads - the idea is that the main thread commits a save to the database, then waits for a secondary thread to pick it up. We're finding that the transaction has to be committed for the second Thread to be able to query the database and find the item. Otherwise, it won't exist. We're trying to accomplish this using an H2 database, Hibernate to manage the access, and the unit test extends AbstractTransactionalJUnit4SpringContextTests . When we try

问题 i am trying to use H2 database with sprint junit test as follows: 1- SpringTestingConfig: @Configuration @ComponentScan(basePackages = "com.myapp.data", excludeFilters = { @Filter(Configuration.class) }) @PropertySource("classpath:/test.properties") @Profile("test") public class SpringTestingConfig { @Bean public DataSource dataSource() { DriverManagerDataSource dataSource = new DriverManagerDataSource(); dataSource.setDriverClassName("org.h2.Driver"); dataSource.setUrl("jdbc:h2:mem:test;MODE

问题 I use Spring boot 1.4.2, which brings hibernate 5.0.11 (JPA 2.1). I want to use the Java 8 time classes in my entities, and so included hibernate-java8 . My entity defines a LocalDate field. @Entity @Table(name = "my_alarms_timeline", indexes = {...}) public class MyAlarm { ... @Column(name = "validity_date") @NotNull private LocalDate validityDate; } I expect this to be mapped to a DATE in my H2 database. In my DB I declare this as validity_date DATE NOT NULL, . When I try to run tests, I

问题 I am recently considering making an application that uses h2 database as its main database (because it comes with JBoss), but I am bit worried about that. I have read in a few places (discussion boards mainly) that one should not use h2 in production. Are there specific reasons for that? 回答1: The main reasons not to use H2 (or HSQLDB, or Derby) for production are: Probability of critical bugs: compared to the 'big' databases Oracle, IBM DB 2, MS SQL Server, MySQL, PostgreSQL, the Java