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Pre-compiled queries are compiled and cached in advance by DB vendor (like oracle,sql server etc) so that they can be faster for successive calls like prepared statement.
In Hibernate Named queries are said to be pre-compiled at web server start up. Does it means all queries are fired at server startup itself so that they can be pre-compiled by DB vendor or pre-compilation has different meaning in hibernate context?
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The hibernate named query is way to use any query by some meaningful name. It is like using alias names. The Hibernate framework provides the concept of named queries so that application programmer need not to scatter queries to all the java code.
Named queries are one of the core concepts in JPA. They enable you to declare a query in your persistence layer and reference it in your business code. That makes it easy to reuse an existing query. It also enables you to separate the definition of your query from your business code.
Native query refers to actual sql queries (referring to actual database objects). These queries are the sql statements which can be directly executed in database using a database client. Similar to how the constant is defined. NamedQuery is the way you define your query by giving it a name.
NamedQueryRepository and each query is represented by a NamedQueryDefinition.Because the user can dynamically add filters, query result limits, locks, and hints, Hibernate cannot pre-compile the HQL/JPQL until execution time.
PreparedStatement for each SELECT and DML statement so you can also get database statement precompilation if the JDBC driver supports it and doesn't emulate the prepare phase by multiplexing the prepare and the execute in a single database request (e.g. MySQL, PostgreSQL).
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