h2

问题 I have create Gluon mobile application that using H2 database as embedded mode. It working fine on Window,Mac,Android. But it unluckily it not working on iOS simulator (The fxml can't load). If I comment the code to load Driver, the UI will load properly. Code Load Driver //load the driver class try { Class.forName(DBCONFIG.DB_DRIVER).newInstance(); } catch (ClassNotFoundException e) { System.out.println("class not found"); e.printStackTrace(); } catch (IllegalAccessException e) { System.out

问题 I am a python developer by day, but I have some java experience as well (mostly with struts). At work I was handed a grails app to install, which was ok, but the owners of the app didn't supply any credentials, and the app loads to a login page. I unpacked the war, but I think the DB config has been packaged into a jar somewhere, because I can't seem to find any connection URL. There's an h2 db file that's been created after I deployed the App, so I'm wondering: how can I connect to the db

问题 I tried to connect with RH2 to a H2 (1.4.181) Database. I've tried different things, like reinstalling R, and fixing potential problems with rJava on Ubuntu. However following error does not disappear: > library("RH2") Loading required package: chron Loading required package: RJDBC Loading required package: DBI Loading required package: rJava > con <- dbConnect(H2(driverClass="org.h2.Driver", jars = "~/h2-1.4.181.jar"), "jdbc:h2:~/test", "sa", "") Error in is(object, Cl): error in evaluating

问题 I have the following query which works nice when running directly against DB2: String sql = "select slutt_dato + 1 day as tDato from klv80201 " + "union " + "select fra_dato as tDato from klv12101 where avtalenr = :avtalenr and kundenr = :kundenr " + "union " + "select fra_dato as tDato from klv12401 where avtalenr = :avtalenr and kundenr = :kundenr and MEDLEMSTATU < '32' " + "order by tDato desc fetch first 1 rows only;"; But when I run it through a test with H2 as database with the

问题 When connecting to an h2 database, the default search path is set to public . You can alter it with the SET SCHEMA_SEARCH_PATH . But if you alter it multiple times, at some point how can you view its current content? I wasn't able to find some kind of commands like this VIEW SCHEMA_SEARCH_PATH or SHOW SCHEMA_SEARCH_PATH . Typing them give me error messages. 回答1: It's a bit a hack, but you could use: SELECT * FROM INFORMATION_SCHEMA.SESSION_STATE WHERE KEY='SCHEMA_SEARCH_PATH' 回答2: Non-hack

问题 I have to write an update query which should work on normal mysql db and h2 database. This was my original mysql query. Query1 UPDATE table1 AS mt, table2 AS et SET mt.country_name = et.country_name, mt.country_continent = et.country_continent WHERE mt.id = et.id But h2 db was complaining syntax error for Query1. org.h2.jdbc.JdbcSQLSyntaxErrorException: Syntax error in SQL statement "update table1 AS mt,[*]table2 AS et as et mt.country_name = et.country_name, mt.country_continent = et.country

问题 H2 database has a command called SCRIPT to backup content and/or structure. It can be performed while the database is running. My question is: Does SCRIPT work like a snapshot? Does it only take statement and database content up until the SCRIPT command is issued? Or does it try to take additional statements performed by other processes into account while SCRIPT is being executed? EDIT To clarify the question, there are two ambiguities about the usage of SCRIPT: Does SCRIPT guarantee

问题 I am trying to Insert my form to h2 database. I am using hibernate and jpa. Here is the code package models; import java.util.*; import javax.persistence.*; import play.data.format.*; import play.data.validation.*; import play.db.jpa.*; @Entity public class MedicalIncident { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) public int id; @Constraints.Required public String month; @Constraints.Required public String place; @Constraints.Required public String unit; @Constraints.Required

问题 I have an embedded H2 database running that I have been connecting to as such: Browser H2 interface This works exactly as desired. I'm using JPA/EJB/JSF to build an EAR that will run on Liberty Profile. I've configured Liberty Profile to work with several different databases in the past, but am having no luck with H2. My server.xml looks like this: <!-- Enable features --> <featureManager> <feature>ejbLite-3.1</feature> <feature>servlet-3.0</feature> <feature>localConnector-1.0</feature>

问题 Say, I've a table like this: I want to find the pair of Centers whose Performance difference is highest for each session, like this: I have the following query, select t1.session, t1.center center1, t2.center center2, t1.performance - t2.performance performance from mytable t1 inner join mytable t2 on t1.session = t2.session where t1.performance - t2.performance = ( select max(t11.performance - t22.performance) from mytable t11 inner join mytable t22 on t11.session = t22.session where t11