Execute sql query in hibernate java3/2/2024 The time Hibernate takes to process the result is not included but can have a huge impact on the overall performance of your query.I'm making Native SQL in Hibernate, but I have some problem when I'm trying to execute my SQL. But please keep in mind that the slow query log only measures the database’s pure execution time. This log configuration is very helpful to identify slow database queries within your application. For each query that was slower than the configured threshold, Hibernate writes a message to the log file. If you execute the scopeidentity () call in a separate statement, SQL Server will not be able to give you last inserted identity value. The reason why its not working is because you need to execute those in the same statement or stored procedure. Hibernate then measures how long it took the database to process each query. Actually the SQLServerDialect class used by Hibernate uses the same 'scopeidentity ()' too. ConclusionĪs you have seen, you can easily activate Hibernate’s slow query log in your configuration. That’s because the slow query log only considers the query’s pure execution time, while the time measured by Hibernate’s statistics also includes the result processing. Hibernate there reports an execution time of 47ms, which is almost twice as long. In the second line, you can see a message from Hibernate’s statistics component. As you can see, the database took 26 milliseconds to execute this query. The first line is part of the slow query log. If the database takes longer than the configured threshold, Hibernate writes the following message to the log file. Query q = em.createNativeQuery("SELECT * FROM Author a", Author.class) EntityManager em = emf.createEntityManager() In the following code snippet, I use the previously discussed configuration and execute a native SQL query that selects all Author entities from the database. This includes JPQL statements, the Criteria API, native queries, and the queries triggered by methods of the EntityManager. Hibernate supports the slow query log for all types of queries. If you're using Logback, you can set it as follows: You also need to set _SLOW logger to at least the INFO level. If you're using Java EE, you can set it in the persistence.xml configuration file: If you're using Spring Boot, you can set this Hibernate setting in the application.properties configuration file: ._QUERIES_SLOWER_THAN_MS=25 In our case, any query that takes more than 25 milliseconds will trigger the Hibernate slow query log. This is a useful feature if we want to execute a database-specific query that is not. To count based on a Criteria you can do this: Criteria criteria currentSession ().createCriteria (type) tProjection (Projections.rowCount ()) criteria.uniqueResult () Im using the Criteria right now so I know for sure that it works. In order to activate the Hibernate slow query log, you need to set the .LOG_QUERIES_SLOWER_THAN_MS property to a value that's greater than 0, representing the query execution threshold. We can directly use a hand-written core SQL query with hibernate. I am creating a web application using JSF, Spring and Hibernate. This slow query log feature has been available since Hibernate ORM 5.4.5 and notifies you when the execution time of a given JPQL, Criteria API or native SQL query exceeds a certain threshold value you have previously configured. Executing mysql query as native query in Hibernate.
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