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10.2.2 Working with the Query interface
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The Query interface defines several methods for executing a query. It provides methods to set parameters for a Query instance, specify pagination properties for the result, control the flush mode, and so forth. The Query interface
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Using the query API and JPQL to retrieve entities
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does not differentiate between JPQL and native SQL, and the same interface can be used for both types of queries. Table 10.3 lists all methods of the Query interface. You can use these methods on the query instance for setting parameters for the query or for executing the query or iterating through the results after you retrieve them. Here is a quick example of some commonly used Query methods in action:
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Table 10.3 The javax.persistence.Query interface enables developers to set parameters for a query, set pagination properties, control the flush mode, and retrieve results for the query. Method Signature public List getResultList() public Object getSingleResult() public int executeUpdate() Purpose Retrieves a result set for a query Retrieves a single result or object Executes a JPQL UPDATE or DELETE statement Sets the maximum number of objects to be retrieved Sets the initial position for the first result being retrieved by the query Sets a vendor-specific hint for the query Sets the value for a named parameter Sets the value for a named parameter when the parameter is of the Date type Sets the value for a named parameter when the parameter is of the Calendar type Sets the value for a positional parameter Set the value for a positional parameter when the parameter is of the Calendar type Sets the flush mode
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public Query setMaxResults( int maxResult) public Query setFirstResult( int startPosition) public Query setHint(String hintName, Object value) public Query setParameter(String name, Object value) public Query setParameter(String name, Date value, TemporalType temporalType)
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public Query setParameter(String name, Calendar value, TemporalType temporalType)
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public Query setParameter(int position, Object value) public Query setParameter(int position, Calendar value, TemporalType temporalType)
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public Query setFlushMode( FlushModeType flushMode)
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Executing the queries
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query = em.createNamedQuery("findCategoryByName"); query.setParameter("categoryName", categoryName); Sets parameter query.setMaxResults(10); query.setFirstResult(3); List categories = query.getResultList(); Retrieves result
In this example, we create a query instance from a named query that was defined earlier. Here we want to retrieve a List of Category entities by name and hence we set the parameter b. We limit the maximum number of items returned to 10, and we position the first entity to be returned at the third item. Finally we retrieve the result C. In this section we examine all aspects of executing a query: setting parameters, retrieving either a single entity or a list of entities, and setting vendor-specific query hints to improve query performance. Setting parameters for a query The number of entities retrieved in a query can be limited by specifying a WHERE clause. If we want to retrieve all instances of the Item entity with a specific price, the JPQL would look like this:
SELECT i FROM Item i WHERE i.initialPrice = 1
In this statement, we ve used a parameter ( 1) for the WHERE clause. There are two ways we can specify this parameter: by number or by name. When we have an integer in the parameter, we call it a positional (or numbered) parameter. Positional parameters are common in query languages. EJBQL 2 also supported positional parameters. Before we execute a query, we have to set the parameter for the query:
query.setParameter(1, 100.00);
In some cases you ll want to specify multiple parameters for a query. Say you want to retrieve all items with an initialPrice that falls within a particular range:
SELECT i FROM Item i WHERE i.initialPrice > 1 AND i.initialPrice < 2
The following code should do the trick:
query.setParameter(1, 100.00); query.setParameter(2, 200.00);
Here we set the first parameter in position 1 to 100.00. This is the lower limit of the range in our query. The upper limit is loaded by setting the parameter in position 2 to 200.00.
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