Java/JPA/Query Parameter — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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(нет различий)
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Текущая версия на 10:22, 1 июня 2010
Date Type Parameter
<source lang="java">
File: Main.java import java.util.Collection; import java.util.Date; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; public class Main {
public static void main(String[] a) throws Exception { JPAUtil util = new JPAUtil(); EntityManagerFactory emf = Persistence.createEntityManagerFactory("ProfessorService"); EntityManager em = emf.createEntityManager(); ProfessorService service = new ProfessorService(em); em.getTransaction().begin(); service.findProfessorsHiredDuringPeriod(new Date(), new Date()); util.checkData("select * from Professor"); util.checkData("select * from Department"); em.getTransaction().rumit(); em.close(); emf.close(); }
}
File: Department.java
import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.OneToMany; @Entity public class Department {
@Id private int id; private String name; @OneToMany(mappedBy="department") private Collection<Professor> employees; public Department() { employees = new ArrayList<Professor>(); } public int getId() { return id; } public String getName() { return name; } public Collection<Professor> getProfessors() { return employees; } public String toString() { return "Department no: " + getId() + ", name: " + getName(); }
}
File: JPAUtil.java import java.io.Reader; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.Statement; public class JPAUtil {
Statement st; public JPAUtil() throws Exception{ Class.forName("org.hsqldb.jdbcDriver"); System.out.println("Driver Loaded."); String url = "jdbc:hsqldb:data/tutorial"; Connection conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createStatement(); } public void executeSQLCommand(String sql) throws Exception { st.executeUpdate(sql); } public void checkData(String sql) throws Exception { ResultSet rs = st.executeQuery(sql); ResultSetMetaData metadata = rs.getMetaData(); for (int i = 0; i < metadata.getColumnCount(); i++) { System.out.print("\t"+ metadata.getColumnLabel(i + 1)); } System.out.println("\n----------------------------------"); while (rs.next()) { for (int i = 0; i < metadata.getColumnCount(); i++) { Object value = rs.getObject(i + 1); if (value == null) { System.out.print("\t "); } else { System.out.print("\t"+value.toString().trim()); } } System.out.println(""); } }
}
File: Professor.java
import java.util.ArrayList; import java.util.Collection; import java.util.Date; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.ManyToMany; import javax.persistence.ManyToOne; import javax.persistence.NamedQueries; import javax.persistence.NamedQuery; import javax.persistence.OneToMany; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity public class Professor {
@Id private int id; private String name; private long salary; @Temporal(TemporalType.DATE) private Date startDate; @ManyToOne private Professor manager; @OneToMany(mappedBy="manager") private Collection<Professor> directs; @ManyToOne private Department department; @ManyToMany private Collection<Project> projects; public Professor() { projects = new ArrayList<Project>(); directs = new ArrayList<Professor>(); } public int getId() { return id; } public String getName() { return name; } public long getSalary() { return salary; } public Date getStartDate() { return startDate; } public Department getDepartment() { return department; } public Collection<Professor> getDirects() { return directs; } public Professor getManager() { return manager; } public Collection<Project> getProjects() { return projects; } public String toString() { return "Professor " + getId() + ": name: " + getName() + ", salary: " + getSalary() + ", dept: " + ((getDepartment() == null) ? null : getDepartment().getName()); }
}
File: ProfessorService.java import java.util.Collection; import java.util.Date; import javax.persistence.EntityManager; import javax.persistence.TemporalType; public class ProfessorService {
protected EntityManager em; public ProfessorService(EntityManager em) { this.em = em; } public Collection<Professor> findProfessorsHiredDuringPeriod(Date start, Date end) { return (Collection<Professor>) em.createQuery("SELECT e " + "FROM Professor e " + "WHERE e.startDate BETWEEN :start AND :end") .setParameter("start", start, TemporalType.DATE) .setParameter("end", end, TemporalType.DATE) .getResultList();
} }
File: Project.java
import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.ManyToMany; @Entity public class Project {
@Id protected int id; protected String name; @ManyToMany(mappedBy="projects") private Collection<Professor> employees; public Project() { employees = new ArrayList<Professor>(); } public int getId() { return id; } public String getName() { return name; } public Collection<Professor> getProfessors() { return employees; } public String toString() { return "Project id: " + getId() + ", name: " + getName(); }
}
File: persistence.xml <persistence xmlns="http://java.sun.ru/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.ru/xml/ns/persistence http://java.sun.ru/xml/ns/persistence/persistence" version="1.0"> <persistence-unit name="JPAService" transaction-type="RESOURCE_LOCAL"> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/> <property name="hibernate.hbm2ddl.auto" value="update"/> <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/> <property name="hibernate.connection.username" value="sa"/> <property name="hibernate.connection.password" value=""/> <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/> </properties> </persistence-unit>
</persistence>
</source>
Query With Parameter
<source lang="java">
File: Professor.java
import javax.persistence.Entity; import javax.persistence.Id; @Entity public class Professor {
@Id private int id; private String name; private long salary; public Professor() {} public Professor(int id) { this.id = id; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public long getSalary() { return salary; } public void setSalary(long salary) { this.salary = salary; } public String toString() { return "Professor id: " + getId() + " name: " + getName() + " salary: " + getSalary(); }
}
File: ProfessorService.java import java.util.Collection; import javax.persistence.EntityManager; import javax.persistence.Query; public class ProfessorService {
protected EntityManager em; public ProfessorService(EntityManager em) { this.em = em; } public Professor createProfessor(int id, String name, long salary) { Professor emp = new Professor(id); emp.setName(name); emp.setSalary(salary); em.persist(emp); return emp; } public void removeProfessor(int id) { Professor emp = findProfessor(id); if (emp != null) { em.remove(emp); } } public Professor raiseProfessorSalary(int id, long raise) { Professor emp = em.find(Professor.class, id); if (emp != null) { emp.setSalary(emp.getSalary() + raise); } return emp; } public Professor findProfessor(int id) { return em.find(Professor.class, id); } public Collection<Professor> findAllProfessors() { Query query = em.createQuery("SELECT e FROM Professor e"); return (Collection<Professor>) query.getResultList(); }
}
File: JPAUtil.java import java.io.Reader; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.Statement; public class JPAUtil {
Statement st; public JPAUtil() throws Exception{ Class.forName("org.hsqldb.jdbcDriver"); System.out.println("Driver Loaded."); String url = "jdbc:hsqldb:data/tutorial"; Connection conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createStatement(); } public void executeSQLCommand(String sql) throws Exception { st.executeUpdate(sql); } public void checkData(String sql) throws Exception { ResultSet rs = st.executeQuery(sql); ResultSetMetaData metadata = rs.getMetaData(); for (int i = 0; i < metadata.getColumnCount(); i++) { System.out.print("\t"+ metadata.getColumnLabel(i + 1)); } System.out.println("\n----------------------------------"); while (rs.next()) { for (int i = 0; i < metadata.getColumnCount(); i++) { Object value = rs.getObject(i + 1); if (value == null) { System.out.print("\t "); } else { System.out.print("\t"+value.toString().trim()); } } System.out.println(""); } }
}
File: Main.java import java.util.Collection; import java.util.Iterator; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; public class Main {
public static void main(String[] a) throws Exception { JPAUtil util = new JPAUtil(); EntityManagerFactory emf = Persistence.createEntityManagerFactory("ProfessorService"); EntityManager em = emf.createEntityManager(); ProfessorService service = new ProfessorService(em); em.getTransaction().begin(); Professor emp = service.createProfessor(1, "name", 100); emp = service.createProfessor(2, "name 2", 100); Integer id = 0; Collection expired = em.createQuery("SELECT u FROM Professor u WHERE u.id > ?1").setParameter(1, id).getResultList(); for (Iterator i = expired.iterator(); i.hasNext();) { Professor u = (Professor) i.next(); System.out.println("Expiring password for " + u.getName()); } for (Object o : em.createQuery("SELECT u FROM Professor u").getResultList()) { System.out.println(o); } util.checkData("select * from Professor"); em.getTransaction().rumit(); em.close(); emf.close(); }
}
File: persistence.xml
<persistence xmlns="http://java.sun.ru/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.ru/xml/ns/persistence http://java.sun.ru/xml/ns/persistence/persistence" version="1.0"> <persistence-unit name="JPAService" transaction-type="RESOURCE_LOCAL"> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/> <property name="hibernate.hbm2ddl.auto" value="update"/> <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/> <property name="hibernate.connection.username" value="sa"/> <property name="hibernate.connection.password" value=""/> <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/> </properties> </persistence-unit>
</persistence>
</source>
Use Entity As Query Parameter
<source lang="java">
File: Department.java
import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.OneToMany; @Entity public class Department {
@Id private int id; private String name; @OneToMany(mappedBy="department") private Collection<Professor> employees; public Department() { employees = new ArrayList<Professor>(); } public int getId() { return id; } public String getName() { return name; } public Collection<Professor> getProfessors() { return employees; } public String toString() { return "Department no: " + getId() + ", name: " + getName(); }
}
File: Professor.java
import java.util.ArrayList; import java.util.Collection; import java.util.Date; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.ManyToMany; import javax.persistence.ManyToOne; import javax.persistence.NamedQueries; import javax.persistence.NamedQuery; import javax.persistence.OneToMany; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity @NamedQueries({
@NamedQuery(name="findProfessorsAboveSal", query="SELECT e " + "FROM Professor e " + "WHERE e.department = :dept AND " + " e.salary > :sal")
}) public class Professor {
@Id private int id; private String name; private long salary; @Temporal(TemporalType.DATE) private Date startDate; @ManyToOne private Professor manager; @OneToMany(mappedBy="manager") private Collection<Professor> directs; @ManyToOne private Department department; @ManyToMany private Collection<Project> projects; public Professor() { projects = new ArrayList<Project>(); directs = new ArrayList<Professor>(); } public int getId() { return id; } public String getName() { return name; } public long getSalary() { return salary; } public Date getStartDate() { return startDate; } public Department getDepartment() { return department; } public Collection<Professor> getDirects() { return directs; } public Professor getManager() { return manager; } public Collection<Project> getProjects() { return projects; } public String toString() { return "Professor " + getId() + ": name: " + getName() + ", salary: " + getSalary() + ", dept: " + ((getDepartment() == null) ? null : getDepartment().getName()); }
}
File: ProfessorService.java import java.util.Collection; import javax.persistence.EntityManager; import javax.persistence.NoResultException; public class ProfessorService {
protected EntityManager em; public ProfessorService(EntityManager em) { this.em = em; } public Collection<Professor> findProfessorsAboveSal(Department dept, long minSal) { return (Collection<Professor>) em.createNamedQuery("findProfessorsAboveSal") .setParameter("dept", dept) .setParameter("sal", minSal) .getResultList(); }
}
File: Project.java
import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.ManyToMany; @Entity public class Project {
@Id protected int id; protected String name; @ManyToMany(mappedBy="projects") private Collection<Professor> employees; public Project() { employees = new ArrayList<Professor>(); } public int getId() { return id; } public String getName() { return name; } public Collection<Professor> getProfessors() { return employees; } public String toString() { return "Project id: " + getId() + ", name: " + getName(); }
}
File: Main.java import java.util.Collection; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; public class Main {
public static void main(String[] a) throws Exception { JPAUtil util = new JPAUtil(); EntityManagerFactory emf = Persistence.createEntityManagerFactory("ProfessorService"); EntityManager em = emf.createEntityManager(); ProfessorService service = new ProfessorService(em); em.getTransaction().begin();
util.checkData("select * from Professor"); util.checkData("select * from Department"); em.getTransaction().rumit(); em.close(); emf.close(); }
}
File: JPAUtil.java import java.io.Reader; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.Statement; public class JPAUtil {
Statement st; public JPAUtil() throws Exception{ Class.forName("org.hsqldb.jdbcDriver"); System.out.println("Driver Loaded."); String url = "jdbc:hsqldb:data/tutorial"; Connection conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createStatement(); } public void executeSQLCommand(String sql) throws Exception { st.executeUpdate(sql); } public void checkData(String sql) throws Exception { ResultSet rs = st.executeQuery(sql); ResultSetMetaData metadata = rs.getMetaData(); for (int i = 0; i < metadata.getColumnCount(); i++) { System.out.print("\t"+ metadata.getColumnLabel(i + 1)); } System.out.println("\n----------------------------------"); while (rs.next()) { for (int i = 0; i < metadata.getColumnCount(); i++) { Object value = rs.getObject(i + 1); if (value == null) { System.out.print("\t "); } else { System.out.print("\t"+value.toString().trim()); } } System.out.println(""); } }
}
File: persistence.xml
<persistence xmlns="http://java.sun.ru/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.ru/xml/ns/persistence http://java.sun.ru/xml/ns/persistence/persistence" version="1.0"> <persistence-unit name="JPAService" transaction-type="RESOURCE_LOCAL"> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/> <property name="hibernate.hbm2ddl.auto" value="update"/> <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/> <property name="hibernate.connection.username" value="sa"/> <property name="hibernate.connection.password" value=""/> <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/> </properties> </persistence-unit>
</persistence>
</source>