The cost of transforming a HQL query to SQL is negligible compared to the cost of actually executing the query. In Hibernate, is this possible to embed the Oracle hint into the Hibernate query? Hibernate setComment()? Can you embed the Oracle hint into HQL with Hibernate custom comment “setComment()” function? Let’s see an example here. Query to select single or several columns with Hibernate Criteria instead of whole table Here i am discuss Projection in hibernate when you want to retrieve columns instead of whole table Criteria API :-Criteria is a simplified API for retrieving entities by composing Criterion objects. Ask Question Hibernate Criteria Query for multiple columns with IN clause and a subselect. HQL is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. But it doesnt means that it will reaplced by hibernate. Assuming your customer form is called CustomerF and the customer's ID is CustomerID then you would set your query criteria to:. Since criteria are a kind of expression, it might be more helpful to get more information about expressions. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database. HQL: The Hibernate Query Language NHibernate is equipped with an extremely powerful query language that (quite intentionally) looks very much like SQL. 0 and provides the detailed features of the Hibernate 3. How to Fix Duplicate Data from Hibernate Queries This problem was the bane of my existence when I first started using Hibernate because I had no idea where the problem was coming from. First let us observe signatures of list() and iterate() as defined in Hibernate API. If your relationship is well defined, then you can use HQL else you have to use your own database specific native sql query. Yeah i was trying projections only, but i was trying to get the persistant object from the list. CodesJava Easy learning with example program codes. Hibernate can be used seamlessly with any type of database as its database independent while in case of JDBC, developer has to write database specific queries. 3 I am having trouble while iterating over a List of results. createCriteria(Foo. Hibernate detects that the @Id annotation is on a field and assumes that it should access properties of an object directly through fields at runtime. CriteriaQuery API allows you to specify the criteria or a condition that you want to apply on a class to access its particular object or a collection of objects. Spring Data JPA has a built in query creation mechanism which can be used for parsing queries straight from the method name of a query method. See also tables that don't have a column with specific name. Hello All, I'm trying to run this query using hibernate The query: select a. In a one session if i am saving a data in one table and then fetching the data from the same table using criteria in same session then my data get inserted in database. There is given commonly used methods: public int executeUpdate() is used to execute the update or delete query. For example, the following query returns Country objects that become managed by the EntityManager javax. L et us see the program on HQL select command , which is going to cover complete object, partial object ( More than one column ), partial object ( Single column) here are the required files…. If your native query returns all columns mapped by your entity and if their names are identical to the ones used in the entity mapping, you just need to provide your entity class as the 2nd parameter to the createNativeQuery method. I run the query and it returns the correct data except for a single duplication of the very first record returned. Criteria is a simplified API for retrieving entities by composing Criterion objects. In Hibernate, is this possible to embed the Oracle hint into the Hibernate query? Hibernate setComment()? Can you embed the Oracle hint into HQL with Hibernate custom comment “setComment()” function? Let’s see an example here. CriteriaBuilder JPA interface Used to construct criteria queries, compound selections, expressions, predicates, orderings. if we run the criteria without the projectionlist added then we would get a query like select id, name, age from Employee. If set the dynamic-insert to true, which means exclude unmodified properties in the Hibernate's SQL update statement. Note : Since Hibernate 5, the Criteria API has been deprecated and hence CriteriaQuery API is used as its replacement to allow us to associate a criteria/condition with a query when accessing the database. HQL stands for Hibernate Query Language. getResultList(); or, Executing the Query to get a single value result then we would call a getSingleResult() method and store the result in an Object. In Hibernate, is this possible to embed the Oracle hint into the Hibernate query? Hibernate setComment()? Can you embed the Oracle hint into HQL with Hibernate custom comment “setComment()” function? Let’s see an example here. I've written a query using Hibernate Criteria API to grab a summation of a particular value, now I need to be able to restrict the result to rows where that sum. Hibernate comes with a feature of Criteria Query which allows us to fetch the data from databased in object oriented style. Advanced Problems. We can create several different kinds of queries that can: display certain records in a table based on some criteria, create summary columns, aggregate data, average data, and bring data from two or more tables together into one view. In this article we will show you, How to write a SQL Query to Find all Tables that Contain Specific Column Name with example. Hi, For that you have to create a valuebean that stores the result of the query. In contrast, a Total row calculates grand totals for one or more columns (fields) of data. createCriteria(Foo. Like List products = this. Suppose you have two tables Club and Team. The Criteria API allows us to build up a criteria query object programmatically, where we can apply different kind of filtration rules and logical conditions. We have learned about HQL in previous articles, Now lets talk about Hibernate Criteria Query Language (HCQL) in this article. Hibernate - Query Language. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database. If we turn on logging for Hibernate, we'll see the following SQL being run: Hibernate: select foo0_. appearance_id = av. In this article, you are going to see how to use query pagination to restrict the JDBC ResultSet size and avoid fetching more data than necessary. Basically the setter does a get of the 2 cols to know what to update. The idea of the query is as follows (see the query below): I have two entities "A" and "B". This approach lets you specify constraints dynamically without direct string manipulations, but it doesn't lose much of the flexibility or power of HQL. The point is I need different columns each query. My query is to get Header object based on some conditions and most important is the latest revision number. Hi , I need to do order by a column of child table. HQL is similar to SQL in syntax, but HQL queries are written against Hibernate's entity objects, not database tables. - Execute query to get list containing Java objects. CriteriaBuilder JPA interface Used to construct criteria queries, compound selections, expressions, predicates, orderings. All rights reserved. Hibernate Annotations support out of the box enum type mapping either into a ordinal column (saving the enum ordinal) or a string based column (saving the enum string representation): the persistence representation, defaulted to ordinal, can be overridden through the @Enumerated annotation as shown in the note property example. Join the DZone community and get the full member experience. In our examples, I’m going to show you how to create a query with hibernate that will group your data in some manner. public interface Criteria extends CriteriaSpecification. So you don't need to write database specific queries. Understand ways to sum data. I have some doubt regarding hibernate criteria query. The Java Persistence API (JPA) is a specification for object-relational mapping in Java. HQL: The Hibernate Query Language NHibernate is equipped with an extremely powerful query language that (quite intentionally) looks very much like SQL. Hibernate is one of the most widely used ORM tool for Java applications. You will find a number of examples for different data types – numbers, dates, text, wildcard characters, non-blank cells and more. The java bean class name and the table name must be mapped, java bean properties and table columns must also be mapped in one hibernate mapping file. Hibernate has few fetching strategies to optimize the Hibernate generated select statement, so that it can be as efficient as possible. Ask Question Hibernate Criteria Query for multiple columns with IN clause and a subselect. Criteria is a another technique of data retrieval apart from HQL and native SQL queries. It means one can include association,inheritance,polymorphism,composition and. Criteria queries are a programmatic, type-safe way to express a query. getSingleList();. If we turn on logging for Hibernate, we'll see the following SQL being run: Hibernate: select foo0_. You can sum a column of numbers in a query by using a type of function called an aggregate function. createQuery() Criteria crit = session. getSingleList();. HQL Insert,Update,Select and Delete Examples. It means one can include association,inheritance,polymorphism,composition and. Criteria query returning single duplicate row forum. But don't be fooled by the syntax; HQL is fully object-oriented, understanding notions like inheritance, polymorphism and association. A similar posting is available on the differences between get() and load(). Calculate grand totals by using a query. Introduction. I have 36 Microsoft SQL Server VM's, each with a specific database ending in _Sec as the DB name. tables t where t. Remember that Hibernate needs to have all the entities meta-data in memory anyway. It gives you more than 70 ready-to-use recipes for topics like basic and advanced mappings, logging, Java 8 support, caching and statically and dynamically defined queries. For eg employee is a pojo having only id and name and address is a pojo containing street and city create a value bean that holds all the details id,name,city, street then use List result=query. It will give more performnce than SQL Written Query. The main difference between is HQL uses class name instead of table name, and property names instead of column name. THE unique Spring Security education if you’re working with Java today. So it is database independent query language. Hibernate Query Language (HQL) is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. * from appearance a, appearance_driver_xref av where a. To make this work, we need to add the meta-definition of the mapping with the @AnyMetaDef annotation. Hibernate 4 Criteria Query Tutorials with Examples using JPA 2. Criteria is a simplified API for retrieving entities by composing Criterion objects. Example of using a Criteria in Query. I have a getter app and a setter app. It gives you more than 70 ready-to-use recipes for topics like basic and advanced mappings, logging, Java 8 support, caching and statically and dynamically defined queries. Hibernate is an ORM implementation available to use with PostgreSQL. 2) What I really wanted to do was define Item. Access Queries - getting to your data. Example On Hibernate Delete Query Hibernate » on Jun 12, 2011 { 10 Comments } By Sivateja T his is the program to Delete a row (Object) from the database, just like using delete query in the jdbc program. Hibernate supports JPA annotations. The Criteria API allows us to build up a criteria query object programmatically, where we can apply different kind of filtration rules and logical conditions. HQL or Hibernate Query Language is the object-oriented query language of Hibernate Framework. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database. Criteria Interface The Criteria interface provides many methods to specify criteria. Right now, Hibernate does not know how to distinguish different entity types, because we did not specify what the entity_type column could contain. More important than getting data into your database is how to get it out. In previous post, we learned about most commonly used JPA annotations in hibernate and we also learned there about the hibernate annotations which complement those JPA annotations. In our examples, I'm going to show you how to create a query with hibernate that will group your data in some manner. NET based application to NHibernate. If it is very important that only some fields update I'd say to load/get the object using the primary key and then update the fields that you wish. But don't be fooled by the syntax; HQL is fully object-oriented, understanding notions like inheritance, polymorphism and association. What I want to do is get get the statues of followed users using hibernate criteria API. Hibernate Criteria JOIN API allows users to perform join operation. Criteria queries are a programmatic, type-safe way to express a query. How to get count of multiple criteria. For example, if you want to subtotal all sales by city or by quarter, you use a totals query to group your records by the category you want and then sum the sales figures. The setter gets 2 columns and for each column calcs new remaining columns and updates them. The properties JPA attribute encodes various book-related properties in a JSON String object. If we turn on logging for Hibernate, we'll see the following SQL being run: Hibernate: select foo0_. Hibernate, as an ORM solution, effectively "sits between" the Java application data access layer and the Relational Database, as can be seen in the diagram above. HQL query how to select only password based on username using HQL query from login table where uname and paswrd are two column names Display Sum of Table Column Using In JSP Display Sum of Table Column Using In JSP an application to Display the sum data of a Table column for a specific Date. Hibernate: getById query [Solved] (Object Relational Mapping forum at Coderanch). It sets all database columns so that it can be used for all update operations. Object object = query. The Criteria interface provides methods to apply criteria such as retreiving all the records of table whose salary is greater than 50000 etc. However, many developers are complaint about the Hibernate's generated SQL statement is slow and more prefer to generated their own SQL (native SQL) statement. This is a very convenient approach for functionality like "search" screens where there is a variable number of conditions to be placed upon the result set. 2) Using "Is null" It is used as a criteria to get the empty data of that field. Let us understand Hibernate Criteria Query Language (HCQL) What is HCQL. Query Creation from Method Name. Let us see an example on hibernate update query, update query in hibernate, updating row in hibernate, updating row in database using the hibernate Please consider disabling your ad blocker for Java4s. Criteria Query Comparison JPQL comparison operators (which are described above) are available also as JPA criteria query expressions. The fetching strategy is declared in the mapping relationship to define how Hibernate fetch its related collections and entities. SP1 I've enabled the Hibernate query cache. Hibernate has to perform an additional query to retrieve the generated values from the database. The memory cost of caching the query is really small. First level and 2nd level. For eg employee is a pojo having only id and name and address is a pojo containing street and city create a value bean that holds all the details id,name,city, street then use List result=query. Hibernate criteria basic query example program code in eclipse : HCQL is mainly used in search operations and works on filtration rules and logical conditions. how to write below queries in Hibernate?? select * from parent p,child c where p. HQL stands for Hibernate Query Language, HQL has the similar syntax like SQL , but HQL is an object-oriented query language. Criteria query returning single duplicate row forum. Besides this, the project folder also contains the hibernate configuration file i. Hibernate Spatial is open source and licensed, like Hibernate, under the LGPL license. The Criteria API provides the org. Certain projection types are defined to be grouping projections, which also appear in the SQL group by clause. Tuning Requirement #1 - Fetch Customers and Their Orders. I have 36 Microsoft SQL Server VM's, each with a specific database ending in _Sec as the DB name. That is can I fill in other fields of patient and then do an update. It will give more performnce than SQL Written Query. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database. As per my experience good interviewers hardly plan to ask any particular question during your interview, normally questions start with some basic. HQL queries are translated by Hibernate into conventional SQL queries which in turns perform action on database. Hibernate Max() Function (Aggregate Functions) In this section, we will show you, how to use the Max() function. In this HQL tutorial, learn what is hibernate query language, hql syntax for various statements, named queries and native sql queries, associations and aggregations etc. Hibernate version: 3. Query to select single or several columns with Hibernate Criteria instead of whole table Here i am discuss Projection in hibernate when you want to retrieve columns instead of whole table Criteria API :-Criteria is a simplified API for retrieving entities by composing Criterion objects. This becomes even more important if you are using a closed source (proprietary) alternative. Object object = query. iterate() methods is available at Hibernate - list() and iterate(). persistence. beginTimestamp + A. appearance_id = av. Hibernate framework translate HQL queries into database specific queries to perform action. I have two tables ACCOUNT_FILTER(parent) and ACCOUNT_CONFIG_FILTER(child) and am trying to do the asc order on the column 'GENRE' of child table. select query using hibernate select query using hibernate Hi, can any one tell me to select records from table using hibernate. If it is very important that only some fields update I'd say to load/get the object using the primary key and then update the fields that you wish. Query with date and timespan in Hibernate stackoverflow. [Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1700) HAVING clause not supported in Criteria API. A SEQUENCE may preallocate values to improve performance. Latest release announcement (2018-03-28): 5. - Anantha Sharma. getResultList(); or, Executing the Query to get a single value result then we would call a getSingleResult() method and store the result in an Object. id Join fetch: select distinct c from Customer c left outer join fetch c. The point is I need different columns each query. In a one session if i am saving a data in one table and then fetching the data from the same table using criteria in same session then my data get inserted in database. In our Hibernate Tutorials, so far, we have executed CURD operations on a single object at a time. Hibernate detects that the @Id annotation is on a field and assumes that it should access properties of an object directly through fields at runtime. In Hibernate, HQL or criteria queries should be able to let you to execute almost any SQL query you want. Learn the best way to use the JPQL DISTINCT keyword with JPA and Hibernate. However, this approach doesn't remove associated instances. fetch-"join" = Disable the. 0 This lesson introduces you with the Hibernate 3. Before Hibernate, If database is changed for the project, we need to change the SQL query as well that leads to the maintenance problem. Executing the Query to get particular using the Hibernate and finally multiple columns of this database the hibernate into action) in a specific directory. However, this approach doesn't remove associated instances. Hibernate uses ResultSetMetadata to deduce the type of the columns returned by the query, from performance point of view we can use addScalar() method to define the data type of the column. com | Email:info at java2s. Using JPA annotations makes your application code portable to other JPA implementations which is a good thing to have. To instantiate CriteriaQuery, we need javax. getResultList(); or, Executing the Query to get a single value result then we would call a getSingleResult() method and store the result in an Object. Therefore, in this article, we are going to see how literals are handled by Hibernate and explain what we have changed in Hibernate 5. Criteria is a simplified API for retrieving entities by composing Criterion objects. Hibernate Criteria Query To Get Specific Columns. I have some doubt regarding hibernate criteria query. Fetch Column Using Expression. there are other cases where I try to make query using criteria as shown above, the query runs fine, but I am unable to understand what am I doing wrong in this case. Hibernate Community Forums. NET based application to NHibernate. [Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1700) HAVING clause not supported in Criteria API. CriteriaBuilder. Hibernate has few fetching strategies to optimize the Hibernate generated select statement, so that it can be as efficient as possible. I don't need all columns so I want to select specific columns to improve performance, but I can't find how to. Executing the Query to get particular using the Hibernate and finally multiple columns of this database the hibernate into action) in a specific directory. For most queries, including criteria queries, the query cache is not efficient because query cache invalidation occurs too frequently. First level and 2nd level. The syntax for HQL is very close to that of SQL, so anyone who knows SQL should be able to ramp up very quickly. Query and call the setParameter overloaded method that takes a Hibernate Type as the third argument. Query to select single or several columns with Hibernate Criteria instead of whole table Here i am discuss Projection in hibernate when you want to retrieve columns instead of whole table Criteria API :-Criteria is a simplified API for retrieving entities by composing Criterion objects. Let us understand Hibernate Criteria Query Language (HCQL) What is HCQL. Is there any solution for that. Criteria query returning single duplicate row forum. Hibernate created a new language named Hibernate Query Language (HQL), the syntax is quite similar to database SQL language. In this tutorial, we are going to learn about Hibernate Query Language (HQL). Hi Scenario I'm working on is similar to twitter. Hibernate 4 Tutorial. Hibernate supports multiple aggregate functions. The most likely reason for creating a database is to make it easy to extract information from the data stored in it. Hibernate criteria query automatically tuned the query for best performance. Calculate grand totals by using a query. However, if we want to modify the first query so that we can dynamically filter the Topic entities by the subclass type, we can use the type method of the Path Criteria API class for this task:. hhiibbeerrnnaattee -- qquueerryy llaanngguuaaggee Hibernate Query Language HQL is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. x which at this time is the latest stable release from the Eclipse Webtools project. Fetch One Column 3. Join the DZone community and get the full member experience. For eg employee is a pojo having only id and name and address is a pojo containing street and city create a value bean that holds all the details id,name,city, street then use List result=query. select query using hibernate select query using hibernate Hi, can any one tell me to select records from table using hibernate. Hibernate Criteria Query To Get Specific Columns. You can then provide this graph as a hint to Hibernate to define which relationships shall be initialized with a given query. CriteriaBuilder JPA interface Used to construct criteria queries, compound selections, expressions, predicates, orderings. Generating SQL statements takes time and Hibernate, therefore, uses one cached SQL UPDATE statement per entity. com, we won't encourage audio ads, popups or any other annoyances at any point, hope you support us :-) Thank you. Because the WTP project not always have had proper versioning of their plugins there might exist WTP plugins in your existing eclipse directory from other Eclipse based projects that are from an earlier WTP release but has either the same version number or higher. Object object = query. The Java application makes use of the Hibernate APIs to load, store, query, etc its domain data. Hibernate provides alternate ways of manipulating objects and in turn data available in RDBMS tables. Criteria query returning single duplicate row forum. java - Hibernate mapping and query - Get link; Facebook; Twitter; Pinterest; Email; Other Apps; June 15, 2013 the hibernate mapping of hbm. Hibernate Criteria Query; Hibernate 4 Tutorials. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database. List collection2 = query. Hibernate comes with a feature of Criteria Query which allows us to fetch the data from databased in object oriented style. The setter gets 2 columns and for each column calcs new remaining columns and updates them. there are other cases where I try to make query using criteria as shown above, the query runs fine, but I am unable to understand what am I doing wrong in this case. While i am freeze table header or first column , Google to find. Get more recipes like this one in my new book Hibernate Tips: More than 70 solutions to common Hibernate problems. Whenever I use addScalar to filter the projection the result will just be plain array of Objects not an Object of my domain which is 'Message'. CriteriaBuilder. CriteriaQuery API allows you to specify the criteria or a condition that you want to apply on a class to access its particular object or a collection of objects. 1 Database: MySQL 4. You need to annotate the attributes that map a database column with a generated value with Hibernate’s @Generated(GenerationTime value) annotation. Hibernate Query By Example and Projections. Select a specific range from table using hibernate criteria Tag: mysql , hibernate I'm trying to fetch n rows at a time from a table, but I don't know how to proceed. This is useful if you want to utilize database-specific features such as query hints or the CONNECT keyword in Oracle. To instantiate CriteriaQuery, we need javax. It can be used with aliases and if the aliases are not present in the Query, the properties can be referred by name. Thanks Please visit the following link: Hibernate Tutorials The above link will provide you different. We looked into Hibernate Query Language and Hibernate Criteria in recent posts, today we will look into Hibernate Native SQL query with examples. The Criteria interface provides methods to apply criteria such as retreiving all the records of table whose salary is greater than 50000 etc. Hi , I need to do order by a column of child table. Besides this, the project folder also contains the hibernate configuration file i. HQL syntax is quite similar to SQL syntax but it performs operations on objects and properties of persistent classes instead of tables and columns. Query and call the setParameter overloaded method that takes a Hibernate Type as the third argument. However we would still get the data in form of Object array. In this tutorial, we are going to learn about Hibernate Query Language (HQL). I have tried using eager fetch too, earlier I was not using an alias, so I tried using an alias too. difference between list() and iterate() hibernate hibernate list method list vs iterate query. However, many developers are complaint about the Hibernate's generated SQL statement is slow and more prefer to generated their own SQL (native SQL) statement. tblConnGroups has 3 columns that I need to include in the results. Hibernate Query Language (HQL) is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. Related posts: – How to use Spring JPA with PostgreSQL | Spring Boot – React Redux + Spring Boot + PostgreSQL CRUD example – How to query alter domain. Therefore, in this article, we are going to see how literals are handled by Hibernate and explain what we have changed in Hibernate 5. by the way select only few columns is called projection , so google with it will be easier. Hibernate supports multiple aggregate functions. Hibernate: getById query [Solved] (Object Relational Mapping forum at Coderanch). Hibernate provides an option to execute queries in the native SQL dialect of your database. public interface Criteria extends CriteriaSpecification. hibernate criteria queries. Query criteria help you zero in on specific items in an Access database. This Java Hibernate tutorial helps you implement a many-to-many association with additional fields in the join table. Criteria Queries can only be used to fetch the records only as they do not support updates or deletes to the database. OneToOne import, which is JPA annotation instead of Hibernate specific import. Criteria api select clause can be used to select whole entities, single expression or multiple expressions. Hibernate Update Query In this tutorial we will show how to update a row with new information by retrieving data from the underlying database using the hibernate. There is no explicit "group by" necessary in a criteria query. CriteriaBuilder JPA interface Used to construct criteria queries, compound selections, expressions, predicates, orderings. They are type-safe in terms of using interfaces and classes to represent various structural parts of a query such as the query itself, or the select clause, or an order-by, etc. addOrder(Order. a) List list() throws HibernateException. hibernate-tips. However, there is a special kind of query where you can optimize the cache invalidation algorithm: lookups by a constant natural key. Understand ways to sum data. Query • Main class used for building and. Please help me solve the issue !!! Answer: Try adding alias :. It provides an SQL inspired language called Hibernate Query Language (HQL) that allows SQL-like queries to be written against Hibernate's data objects HQL (Hibernate Query Language) is the object-oriented version of SQL. Hibernate provides several different ways to query for objects stored in the database; for example, native SQL queries, HQL queries, and Criteria API. This example is using a basic Foo entity and is very much similar to the JPA with JQL implementation – the only difference being the query language. Hibernate Query Language (HQL) is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. To instantiate CriteriaQuery, we need javax. When we build our query, we will be focusing on using Hibernate’s Criteria queries, which allows for a nice way to build queries without having to know any SQL. ORM uses metadata which describes the mapping between classes & tables, instances & table rows and instance properties & table columns. April 14, 2005 Hibernate in 60 Minutes 21 [Ant Buildfile] Invokes XDoclet XDoclet ships with the Hibernate tasks Generates mapping files and hibernate. What is Criteria api? Criteria api in Hibernate is used to fetch data from database tables. It also provides some build-in aggregate functions like sum, max, min etc. schema_id) as schema_name, t. Classes used: User (This one has a many to many relationship to itself mapped by follow table) Status (This one has a foreign key of user who put that) If I'm to write it in a plain old sql this would be it. It is very powerful and flexible and has the following characteristics: SQL similarity: HQL's syntax is very similar to standard SQL. In Hibernate, the Criteria API helps us build criteria query objects dynamically. It is most frequently used in enterprise applications, such as corporations, schools, interest-based user groups, charities or governmental entities. The elements are used to define specific mappings from a Java classes to the database tables. I have some doubt regarding hibernate criteria query. The Criteria API allows us to build up a criteria query object programmatically, where we can apply different kind of filtration rules and logical conditions. 2) Using "Is null" It is used as a criteria to get the empty data of that field. Hibernate Insert Query Tutorial By Lokesh Gupta | Filed Under: Hibernate Hibernate is an object-relational mapping (ORM) library for the Java language, providing a framework for mapping an object-oriented domain model to a traditional relational database. The reason it updates all is that hibernate has no way of knowing if any of the fields have changed (it would need to do a select first to get the data, which is less efficient), so it updates all. Criteria queries are a programmatic, type-safe way to express a query. Luckily, in addition to JPQL support, Hibernate features a criteria query API which you can leverage for the cases it is needed and stick to the standard API elsewhere in the application. In our Hibernate Tutorials, so far, we have executed CURD operations on a single object at a time. After the load() method returns, we need to cast the returned object to suitable type of class to further use it. If you stick indices on version and objid columns, this query should be fairly efficient. Hibernate also supports native SQL statements. These counts need to be converted into percents based on the total number of companies who are not in compliance. An alias may optionally be assigned to a projection, so that the projected value may be referred to in restrictions or orderings. gavin - my problem is occuring with writing a query criteria for the map object. I don't need all columns so I want to select specific columns to improve performance, but I can't find how to. Spring Data JPA has a built in query creation mechanism which can be used for parsing queries straight from the method name of a query method. A similar posting is available on the differences between get() and load().