I’m investigating using cursor-based pagination. I have the following (postgres) table: and had begun to sketch out the pagination query (not tested): I’ve been reading these posts: https://slack.engineering/evolving-api-pagination-at-slack-1c1f644f8e12 https://engineering.mixmax.com/blog/api-pagi…
Tag: spring
Spring JPA – Prepared Statement Queries?
I’m building a Spring REST server application and I’m doing some native queries to retrieve data from my database. From the teaching in school, they suggest to make all queries prepared statements, to stop the user entering harmful SQL into the input boxes. I’ve tried to do some research, bu…
Whats the disadvantage of setting a too high batch size?
I set the batch_size in application.yml: spring: profiles: dev jpa: properties: hibernate: generate_statistics: true jdbc: batch_size: 20 Whats the reason …
How to check not null date in spring jpa
I have 2 IF. If No 1, is work for me. Because i wont if data is present and get house keeping == null. for action to update condition,status,and housekeeping. IF no 2, no work for me. I wont if getData is present and get housekeeping is availabe / not null. For action only to update condition Only check ̵…
How to sort by pagerequest with inner join
I have two tables with many to one realtion. I want to sort data in table “user” by column “street” that is in “address” table in ASC or DESC direction defined by request param: localhost:8080/…
Hibernate Null Attribute Value using Camel-Case
Using Hibernate 5.3, Spring Boot 2.1, MySQL, that runs in Windows 10 OS. What I know I have verified on my phpmyadmin the case of the attributes. And as long the case were the same as the attributes of my Entity class you don’t have to explicitly define the column name in that Entity. And using @Column(…
Filter rows in DataSet using JPA/Hibernate
I have the following code which is used to retrieve data from multiple tables (using joins) and then mapping every row into a DTOList but I also need to apply filters based on user preferences: per …
paging and sorting with Jpa returns only around 10% records from db
When I try to retrieve data from JpaRepository with Pageable request it only return 10% from all records. as example I had 68 records in MySQL database and pageble request only return first 10 records. when i try to get 2nd resultset it returns empty page content object. but if I request 100 records in one re…
Response from query couldn’t map to pojo class spring boot
Every response from query should be mapped to a poja class. I have written a native query @Query(value=”SELECT new QuestionJsonTotalAnswer(q.question) FROM mydb.question q”, nativeQuery=true) List&…
I/O error while reading input message; nested exception is java.io.IOException: Stream closed
This is my controller: This is the error I get: “message”: “I/O error while reading input message; nested exception is java.io.IOException: Stream closed” Answer Your error is the result of @RequestBody being used twice in your controller method arguments. Following line causes the iss…