h2

问题 I'm using the default configuration for the yo jhipster generator except that I'm using mysql as my "dev" database. When I run mvn test my tests succeed with no failures. However, I found that if I ran tests a second time, the suite would fail since it would run against the "dev" database...that wasn't 'rolled back' or 'reset' after the previous test run. I would rather have expected it to run against an in-memory h2 database as configured in src/test/resources/config/application.yml that

问题 I asked a similar question the other day but have since realized I was getting ahead of myself. I'm seeking advice on the proper way to handle the following scenario. I'm trying to SELECT the correct longitude and latitude for a given address and city, in the fastest way possible. My COORDINATES table has 25,000 rows and looks like this: I have a Java HashMap<Integer, List<String>> which contains an Integer as the key, and an ArrayList containing 2 entries, an address and city. The HashMap

问题 I am a fan of H2, and H2-Console. Unfortunatly, when i run the h2 on my java spring-boot application, by default the JDBC URL is as jdbc:h2:~/test meanwhile it should be jdbc:h2:mem:testdb to be able to see the saved objects. So, I am wondering if there is a way to configure this JDBC URL from the application.properties or not? The below image shows better what i am talking about: 回答1: You can use below properties for connecting h2 database via application.properties file spring.h2.console

问题 I run H2 in cluster mode with 2 nodes. I have two tables. A parent, and a child. The child contains a foreign key to the ID of a row of the parent table. I'm experiencing a weird issue that I can not understand : everything is working OK until I violate a unique constraint. Steps: - Everything is working normally - I violate (by purpose here) a Unique constraint - Now when adding child rows, I get a referential integrity violation on the foreign key (parent.id), but the child row is properly

问题 H2 db is not accessible at localhost:8080/h2-console when using webflux. I read somewhere that this is available only when developing a Servlet based application. But I am using Webflux with Netty. So is there a way to see the h2 console in such an application? 回答1: I had the same issue, I ended up booting the console server manually on another port: @Component @Profile("test") // <-- up to you public class H2 { private org.h2.tools.Server webServer; private org.h2.tools.Server server;

问题 I have an H2 database file calls "test.db". The file is located in my application directory: "myApp/resources/test.db". I'm not able to get this works for me.So, what's the correct way to refere to a relative path. Here is the configuration of my hibernate.cfg.xml. <property name="connection.driver_class">org.h2.Driver</property> <property name="connection.url">jdbc:h2:file:/test</property> <property name="connection.username">test</property> <property name="connection.password">1234<

问题 I have the following test.. @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = {"/schedule-agents-config-context.xml"}) @TransactionConfiguration(transactionManager = "transactionManager", defaultRollback = true) @Transactional public class H2TransactionNotWorkingTest extends SubmitAgentIntegratedTestBase { private static final int FIVE_SUBMISSIONS = 5; @Autowired private ApplicationSubmissionInfoDao submissionDao; private FakeApplicationSubmissionInfoRepository

问题 I want to create an alias for the IF function in H2 for MySQL compatibility as asked here. Vituels answer explains how to do this with CREATE ALIAS: CREATE ALIAS IF NOT EXISTS `IF` AS $$ String ifFunction(boolean condition, String exp1, String exp2){ if(condition) { return exp1; } else { return exp2; } } $$; This works if you use the alias with string parameters, but does not work for numbers. If I use Integer in the alias definition instead of String , it's the other way round. Using Object

问题 I often find myself in a situation where I want to write automated tests for my database queries. My current use case is a Spring MVC web app and a Postgres database. As far as I can tell, I have two options: Stand up an actual Postgres instance and initialize it with a test data set Utilize an in-memory database such as H2. I have used Option #1 in the past (albeit with an Oracle database and Oracle XE) with good success. The main downfall of this approach is that the tests aren't self

问题 I'm trying to add the NOT_NULL constraint to a column in an SQL h2 database, using ALTER TABLE CHARACTERS ADD CONSTRAINT nn_PID NOT_NULL (PLAYER_ID); This follows the pattern I found here: ALTER TABLE Persons ADD CONSTRAINT pk_PersonID PRIMARY KEY (P_Id,LastName) Except I change the constraint, table and column names. But I get this error: Syntax error in SQL statement "ALTER TABLE CHARACTERS ADD CONSTRAINT NN_PID NOT_NULL[*] (PLAYER_ID) "; expected "., COMMENT, PRIMARY, INDEX, KEY, CHECK,