Hibernate 3 - Persistent Objects Retrieval

Hibernate Query Language Questions in this category test your knowledge on :

• Query APIs and its methods : list(),
• the from clause syntax, using alias (with and without 'as')
• the select clause syntax, use of ',' to separate operands
• the different ways to make joins : theta style, join, left join and corresponding SQL generated
• the where clause syntax, building and combining conditions
  • operators : = , <>, <, >, >=, <=, between, not between, in, not in
  • parameters injection : Query.setXXX()
• the elements() clause
• subqueries syntax : all, any, some, in
• Result sorting : .addOrder(), Order.desc(), Order.asc()
• Result paging : setFirstResult(), setMaxResult()
• use of aggregate functions : count(), min(), max(), sum(), avg()
• named queries definition
  • definition in mapping file : <query />
  • APIs to retrieve it
• bulk update/delete queries syntax
• dynamic instantiation : select new()

Query by Criteria Questions in this category test your knowledge on :

• Session APIs related to Criteria : createCriteria()
• Criteria methods used to retrieve entities : add(), list(), scroll(), ...
• Restrictions APIs, know the basic methods : and(), between(), eq(), ge(), gt(), in(), le(), lt(), ...
• Projections APIs, know the basic methods : avg(), count(), distinct(), min(), max(), sum(), ...
• Code example resulting SQL

Query by Example Questions in this category test your knowledge on :

• Example APIs : create(), enableLike(), ignoreCase(), excludeZeroes(), excludeNone(), excludeProperty()
• MatchMode APIs : ANYWHERE, END, START, EXACT
• Code example resulting SQL

Native SQL Queries Questions in this category test your knowledge on :

• Session related APIs : createSQLQuery()
• Syntax {class.*}
• Query related APIs : addEntity()
• Named Queries
  • definition in mapping file : <sql-query />
  • APIs to retrieve it : getNamedQuery()

Collection and Class Filters Questions in this category test your knowledge on :

• Collection filters
  • related Session APIs : .createFilter() and allowed arguments
  • where clause in mapping file
• Dynamic filters on Class and Collection
  • <filter />, <filter-def /> and <filter-param /> element and allowed content
  • related APIs : Session.enableFilter(), Filter.setParameter()