h2 | 易学教程

Load Spring-Boot Database with Test Data

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问题 Goal: Leverage spring-boot Data Initialize features to create a simple database and load it with data. Problem: Receiving an error during spring-boot start up. org.hibernate.tool.hbm2ddl.SchemaExport : Column "FIRSTNAME" not found; SQL statement More of the spring-boot start-up output: 2015-03-06 17:32:30.919 INFO 3688 --- [ main] o.s.jdbc.datasource.init.ScriptUtils : Executing SQL script from URL [file:/E:/spring-workspace/TestApp/target/classes/schema.sql] 2015-03-06 17:32:30.926 INFO 3688

H2 driver not found when try to connect

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问题 I have gone through some other answers, but cannot get the solution to my problem. I am using NetBeans 7.0.1 and the latest version of the H2 DB on Win7. I successfully use the H2 console tool and I have also added the driver in NetBeans and am able to connect (i.e. see the DB, tables, issue commands, etc). However from within my Java code when running it, I get the message: "java.lang.ClassNotFoundException:org.h2.Driver". My code is: Class.forName("org.h2.Driver"); Connection conn =

H2 driver not found when try to connect

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Recursive CTE in H2: No data returned

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问题 I am trying to convert a proprietary Oracle CONNECT BY query into a standard SQL query that will run on H2, and generate the same data in the same order . This is the Oracle query, which works: SELECT id, name, parent FROM myschema.mytable START WITH id = 1 CONNECT BY PRIOR id = parent This is what I've come up - however, it returns no rows in the ResultSet . WITH RECURSIVE T(id, name, parent, path) AS ( SELECT id, name, '' AS parent, id AS path FROM myschema.mytable WHERE id = 1 UNION ALL

Make Oracle last_day function be compatible with H2 database

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问题 I am writing integration testing and I want to test my sql queries by using a H2 database. In production these queries are running against an Oracle database. I have to run this query I have tries to use the compatibility mode SELECT last_day(MY_CURRENT_DATE) from MY_TIME by using the oracle compatibility mode jdbc:h2:mem:default;MODE=Oracle;DB_CLOSE_DELAY=-1 but I receive this error: org.h2.jdbc.JdbcSQLException: Function "LAST_DAY" not found; SQL statement: SELECT last_day(MY_CURRENT_DATE)

H2 database create alias for function in package in schema

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问题 In my code I call stored procedure like this (and it works perfectly): { ? = call schema.package.function(?) } I need to call it like this because jdbc connection is set to another schema. But for now I can't test it because H2 database doesn't support packages. So if I change my jdbc url database name to the one I require and delete " schema " from the call everything is ok while testing. @Test fun test() { val session = em.entityManager.unwrap(Session::class.java) session.doWork { val st =

H2 embeded DB with spring boot error auto configuring

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问题 i'm trying to use the H2 embedded DB with spring boot. But, it throws the following errors. 2016-10-19 22:05:25.818 INFO 14104 --- [ main] com.example.SpringDemoApplication : Starting SpringDemoApplication on BOM1-LPMP12AS7U with PID 14104 (D:\workspace\eclipse\SpringDemo\target\classes started by e3028311 in D:\workspace\eclipse\SpringDemo) 2016-10-19 22:05:25.822 INFO 14104 --- [ main] com.example.SpringDemoApplication : No active profile set, falling back to default profiles: default 2016

H2DB and Java, an approximate> two hour discrepancy

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问题 I am developing a race timing system, and for several instances, I need to retrieve a time object from H2DB. Like its bretheren (or sisteren), the time data type is relative to 1st January 1970 and is expressed in SQL in the 'hh:mm:ss' format, with the date being by set by default to 01-01-1970. It is by default mapped to the a 'java.sql.Time' object. Being a trusting padawan, I coded the following to separate hours from minutes for display purposes. if(race.getCutOffTime()!=null){ long

H2 Java Insert ignore - allow exception

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问题 I am working on a java plugin interfacing with an H2 database. What I really want is an "Insert Ignore" statement; however, I'm aware that H2 doesn't support this. I am also aware of Merge, but this is really not what I want, if the record exists I don't want to change it. What I am considering is to just run the insert and let the duplicate key exception happen. However, I don't want this to fill my log file. The DB call happens in an imported class that I can't change. So my questions are:

年底了，整理了一份程序员面试必看的文章合集

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