下記クエリをcurlにて実行するとExecuting an update/delete queryエラーとなります。. Spring Bootは、Javaのフレームワークの一つ。Springプロジェクトが提供する様々なフレームワークを統合した、アプリケーションを高速で開発するために設計されたフレームワーク. JdbcTemplate provides methods such as queryForObject, query, update etc to perform database operations. In application.properties file we configure DataSource and connection pooling. Spring boot chooses tomcat pooling by default. Transaction management is performed by using spring @Transactional annotation either at class level or method level.
In JPA delete entity example, we will learn to delete JPA entities using
@NamedNativeQuery
created with createNativeQuery()
method of the EntityManager
interface. Here we pass in the query string to be executed in underlying database and a dummy result mapping [Read More]. We will use named SQL native queries for defining the delete queries in one place in this example.1. Create named native DELETE query
Named SQL queries are defined using the
@NamedNativeQuery
annotation. This annotation may be placed on any entity and defines the name of the query as well as the query text. Like JPQL named queries, the name of the query must be unique within the persistence unit.Named native queries for SQL DELETE statements are defined like this:
Here we have defined one named native query
deleteEmployeeById
. It can be used to delete an employee record from database using it’s employee id. It’s an example of jpa delete entity by id.2. How to execute named delete queries
To execute above SQL delete queries, we will need use
EntityManager.executeUpdate()
method.3. JPA delete entity example – complete example
3.1. EmployeeEntity.java
3.2. EmployeeDAO.java
3.3. EmployeeDAOImpl.java
3.4. TestEmployeeDAO.java
Output of above testcases will be:
Use above method to create query for jpa delete all
Drop me your questions and comments.
Happy Learning !!
I have a requirement to run custom queries at scheduled time.Ex: User defines a custom query to run on postgres database at a particular time of the day. I need to implement a scheduler which picks up the custom queries and scheduled time which are stored in database and execute dynamically.
I can schedule the jobs using Cron scheduler using spring boot which defines the time and date as annotation. But I need to run multiple schedules my picking up date/time from db and run the custom query.
ShivaShiva
3 Answers
ShivaShiva
Please refer my answer https://stackoverflow.com/a/56474916/10232467. This will serve your situation if you have fixed schedule for querying database.
EspringDevEspringDev
PShettyPShetty