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. 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. The following form is not vulnerable to column nameĭuplication: sess.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. Specified in the mappings ('ID' and 'NAME'). The query will, however, fail because there is aĬonflict of names the instances are mapped to the same column names.Īlso, on some databases the returned column aliases will most likely be The query was intended to return two Cat instances per row: a catĪnd its mother. Most likely will fail): sess.createSQLQuery('SELECT c.*, m.* FROM CATS c, CATS m WHERE c.MOTHER_ID = c.ID') Problematic for SQL queries that join multiple tables, since the sameĬolumn names can appear in more than one table.Ĭolumn alias injection is needed in the following query (which Until now, the result set column names are assumed to be the sameĪs the column names specified in the mapping document. Of the same type or when the default alias/column names are not Problems can arise when returning multiple entities Native queries, without starting to enhance the sql queries to make them sess.createSQLQuery('SELECT ID, NAME, BIRTHDATE, D_ID, D_NAME, CAT_ID FROM CATS c, DOGS d WHERE c.ID = d.CAT_ID')Īt this stage you are reaching the limits of what is possible with Is possible to do the same eager joining for collections, e.g. ('cat') to be able to specify the target property path of the join. Their dog property fully initialized without anyĮxtra roundtrip to the database. In this example, the returned Cat's will have sess.createSQLQuery('SELECT c.ID, NAME, BIRTHDATE, DOG_ID, D_ID, D_NAME FROM CATS c, DOGS d WHERE c.DOG_ID = d.D_ID') This isĭone via the addJoin() method, which allows you to It is possible to eagerly join in the Dog toĪvoid the possible extra roundtrip for initializing the proxy. Not mapped, or does not result in the expected type, it is possible toĬustomize it via calls to registerHibernateType inġ3.1.3. Handling associations and collections To Hibernate types is controlled by the Dialect. How the returned from ResultSetMetaData is mapped NAME and BIRTHDATE, where as the type of ID is explicitly

ResultSetMetaData is used to determine the type of This is essentially the same query as before, but now sess.createSQLQuery('SELECT * FROM CATS') It is possible to leave out the type information for all or some * and could return more than the three listed This also means that only these threeĬolumns will be returned, even though the query is using ID, NAME and BIRTHDATE column as respectively a Long, String and a Shortįrom the underlying resultset. ResultSetMetadata but will instead explicitly get the This will return Object arrays, but now it will not use

Execute sql query in hibernate java