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Query query = em.createQuery("SELECT i FROM Item i");

An aspect-configuration file defines the aspect methods that must be called when the aspect is instantiated. Each line in the file begins with the name of the method to call, continues with the values of the given parameters, and ends with a semicolon. The parameters are specified in a spaceseparated list. String parameters must be written between double quotes, and arrays must be written between brackets. Comments in aspect-configuration files follow the same syntactic rules that Java does. You can include other files in an aspect-configuration file by using the include keyword.

You can see that the JPQL syntax resembles SQL, but JPA recommends that you use JPQL. The differences in notation between SQL and JPQL will be more evident later in section 10.3, when we explore JPQL by itself. Let s recap where we are now. We ve created an instance of the EntityManager, and we ve created an instance of the query. The next step is the actual execution of the query. The Query interface provides the methods we need.

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

When sending messages to a JDBC appender, be careful not to send any characters in the message that would disrupt the SQL statement. For instance, sending a ' character would cause the SQL statement in the recipe to fail.

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:

Consider the PresentationAC aspect that is shown in Listing 4-8. Listing 4-8. The PresentationAC Aspect Component package aop.jac; import org.objectweb.jac.core.AspectComponent; public class PresentationAC extends AspectComponent { public void display() { /* ... */ } public void setAttributesOrder( String className, String[] attributeNames ) { /* ... */ } public void setCategory( String className, String[] attributeNames, String value ) { /* ... */ } } PresentationAC defines the setAttributesOrder method to specify the display order for the attributes of the given classname class. This order is defined by the attributeNames array, which contains the attribute names. The aspect-configuration file, named presentation.acc, contains the following lines: setAttributesOrder Customer { lastName, firstName, phone, email }; setCategory Customer { lastName, firstName } main; display ;

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

According to the log4j team, the JDBC appender will be replaced in the future with one that offers more features. For example, the current JDBC appender does not log exceptions. Please refer to the log4j documentation for updates to this appender.

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)

public Query setParameter(String name, Calendar value, TemporalType temporalType)