I’m trying to sort column data in my h2 database, but it isn’t correct. I think that change of collation may help. I tried to set collation in datasource url in many ways e.g.: spring.datasource.url = jdbc:h2:mem:testdb;COLLATION=’ENGLISH’ spring.datasource.url = jdbc:h2:mem:testdb;SET COLLATION=’EN” spring.datasource.url = jdbc:h2:mem:testdb;SET COLLATION ENGLISH STRENGTH PRIMARY’ And I’m still have an syntax error like this Syntax error in
Tag: database
Using 0 as Primary Key
I use lookup tables commonly and sometimes I have some default record in the Lookup table and I think for this record I can use 0 as Primary Key a as shown below: Project: By doing this I can start from 1 for the actual project values (A, B, C…) and on the other hand I can easily distinguish general/default
JOOQ: How to resolve foreign keys as objects?
Say I have a table that references another table, in this case “TestScenarios” references “TestSchemas”. So each TestScenario HAS-A TestSchema. I autogenerated DAOs, however, when fetching TestScenario instance via the DAO the TestSchema field is an integer, not a TestSchema-object. How can I get JOOQ to resolve foreign keys directly as objects up to a certain depth? Answer DAOs don’t
Constructor in a for loop
I’ve a beginner at java programming and I’ve been tasked at creating a database. The database is a bike store with a super class Bike and sub classes mountain bike, road bike. I also have a class …
Oracle 19c compatibility with jdk7
I would like to know if oracle 19c is compatible with jdk 7. I have found out 2 drivers for oracle 19c ojdbc8 : for jdk8, jdk9 and jdk11 ojdbc10 : for jdk10 and jdk11 I would like to know if there is a way to have oracle 19c with a jdk7, and if yes what is the driver that
How to create a sequence in JPA without creating it directly in the database
I am doing a service that gets data from a source and fetches them into my Database by using JPA. The id is generated by using sequence. I have created the sequence on my DB by using this command: However, I don’t know how to create the sequence directly from my code. Can anyone please help me to figure out
HQL Join with three tables
I’m having some issues with HQL since I’m a newbie with it. Even though I don’t have issues with “simple queries”, I am currently stuck with a query involving three tables. I have already gone through some tutorials, but I haven’t been able to find a valid example for my needs. I have tried my best to explain my problem:
UNIQUE constraint failed: sqlite database : android
I am trying to insert values in table. But there is only one value inserted. I am getting an error in log cat when I am trying to insert new values. Log cat shows : Its showing error on these two lines while inserting row. EventTableHelper How to solve this?? Answer Your code probably violates primary key’s uniqueness constraint on
How to call a PostgreSQL stored procedure with Hibernate
I want to create a Stored Procedure in PostgreSQL to make some calculation and return it to My java call. I have tried Most of the option from Java-Hibernate but not able to succeed. Below is my SP. In Java How to call this procedure to get the values. NOTE: I’m not using hibernate XML files to call quires. Please
How you create confirmation link for email?
In my project I need to send letter to user email with confirmation link. My solution: Add string column “code” and boolean column “is_active” (with default value false) to user table. When user register, generate unique string key and save to database. Send to email link, for example host.com/user/email/{code}/confirm Then find by the code (generated string value) user and set