h2

问题 in my current project I use a H2 database to store the data from a JTable (to be precise the TableModel's data). I have written the code to save all columns from my table and now I want to retrieve the data again (load from the database). So far so good but I can't come up with any good way of retrieving the data from the database and polish it to be addable to my table again. I have a method for my table to add a new row with data for all columns so that's no problem (something like public

问题 I am trying to use H2 embedded database with script config to create and load database during test. It works fine but when I tried to add transaction support for my database interactions I am getting error during context initialization. Here is my spring config: <bean id="dbcpDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="org.h2.Driver" /> <property name="url" value="jdbc:h2:mem:embeddedH2Database;MODE=Oracle;DB

问题 I'm creating a POST service that allows an admin-user to upload images to a Play! application, and while I'm testing it I am using the inbuilt H2 filesystem database. According to https://gist.github.com/1256286#file-picture-java-L3 a good way to store these images in Play! is as a byte array, which is then rendered using Controller#renderBinary(...) . The Campaign object in this function stores all the data about a campaign and has a list of Banner objects, each of which is basically an

问题 I am new at using hibernate and I have a problem. pom.xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.mywebsite</groupId> <artifactId>emusicstore</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.springframework<

问题 I have wrote following code: private static void startH2(){ Server server = null; try { server = Server.createTcpServer("-tcpAllowOthers").start(); Class.forName("org.h2.Driver"); Connection conn = DriverManager. getConnection("jdbc:h2:tcp://localhost/~/test;MODE=PostgreSQL", "sa", ""); } catch (Exception e) { LOG.error("Error while initialize", e); } System.out.println("finish"); } public static void main(String [] args){ startH2(); } I run my main method and see following situation: Looks

问题 I have experienced some issues while setting up Slick 2.0.2. Any configuration that I do in one session is lost in the next. For example, in the first session, I create the table and add three people: // H2 in-memory database lazy val db = Database.forURL("jdbc:h2:mem:contacts", driver="org.h2.Driver") // Contacts table lazy val contacts = TableQuery[ContactsSchema] // Initial session db withSession { implicit session => contacts.ddl.create // Inserts sample data contacts += Person("John",

问题 I am working on a requirement where I need to generate a unique(non-repeatable) and random number(unpredictable) with atleast 10 digits. I tried SELECT FLOOR(RAND() * 9999999) .. but the uniqueness cant be guaranteed with this. About 20k values will be inserted per month approx. Also I want to increment an int column of my table(number_of_hits) for every entry inserted... I am using spring boot to insert values into table. Tried number_of_hits int AUTO_INCREMENT while creating the table but

问题 This is a follow up question of : Import CSV in H2 DB of grails I am trying to use the default H2 DB of grails, which can link and load the three CSV files in the DB and query them whenever possible. My entire codes for Grails where written with MySQL as a dummy DB, I have used and implemented AJAX calls also in controller/index using remotefunction. Can all of these be used in the same format when I change my datasource to H2 DB ? I am not able to find any documentation on H2 for grails

问题 I am looking forward how to store my passwords in database in encrypted form. I found this manual, but still not sure how to put it into my ddl. The code below doesn't work. create table USER_USER ( USER_USER_ID long NOT NULL AUTO INCREMENT, USER_USER_LOGIN varchar(50), USER_USER_PASSWORD varchar (50) cipher lzf, USER_USER_EMAIL varchar(50) ); 回答1: First of all, lzf isn't a valid argument for cipher ; H2 only supports aes and xtea (documentation) That said, don't let the database encrypt

问题 I have a query that does something like this... SELECT * FROM ... ... ORDER BY DECODE(APR(ACC.RATE,'X'), 'FIRST RATE', 1, 'SECOND RATE', 2, 3); Because I am dealing with h2 database and h2 doesnt have decode and decode alias is very difficult to implement so I was wondering if I could convert this DECODE into CASE statement. How do I convert it? 回答1: Decode means: CASE FirstParam WHEN SecondParam THEN ThirdParam WHEN FourthParam THEN FifthParam WHEN SixthParam THEN Seventh... etcetera ELSE