JPA 2.0 から Criteria API を使用してクエリを作成しようとしていますが、うまくいきません。
問題は、「間」条件メソッドにあります。どうすればよいかを知るためにいくつかのドキュメントを読みましたが、JPAを発見しているので、なぜそれが機能しないのかわかりません。
まず、「Transaction_」と書いたときに現れるはずの「creationDate」が見えません。
実行時にメタモデルが生成されると読んだので、おそらく正常だと思ったので、「Foo_.value」の代わりに「Foo_.getDeclaredSingularAttribute("value")」を使用しようとしましたが、それでもまったく機能しません。
これが私のコードです:
public List<Transaction> getTransactions(Date startDate, Date endDate) {
EntityManager em = getEntityManager();
try {
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Transaction> cq = cb.createQuery(Transaction.class);
Metamodel m = em.getMetamodel();
EntityType<Transaction> Transaction_ = m.entity(Transaction.class);
Root<Transaction> transaction = cq.from(Transaction.class);
// Error here. cannot find symbol. symbol: variable creationDate
cq.where(cb.between(transaction.get(Transaction_.creationDate), startDate, endDate));
// I also tried this:
// cq.where(cb.between(Transaction_.getDeclaredSingularAttribute("creationDate"), startDate, endDate));
List<Transaction> result = em.createQuery(cq).getResultList();
return result;
} finally {
em.close();
}
}
誰かがこれを理解するのを手伝ってくれますか? ありがとう。
EDIT：ここにトランザクションソースがあります（データベースからNetbeansによって自動的に生成されたため、ほとんど何もありません）
package projetjava.db;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name = "transaction")
@NamedQueries({
@NamedQuery(name = "Transaction.findAll", query = "SELECT t FROM Transaction t"),
@NamedQuery(name = "Transaction.findById", query = "SELECT t FROM Transaction t WHERE t.id = :id"),
@NamedQuery(name = "Transaction.findByIDAccount", query = "SELECT t FROM Transaction t WHERE t.iDAccount = :iDAccount"),
@NamedQuery(name = "Transaction.findByDescription", query = "SELECT t FROM Transaction t WHERE t.description = :description"),
@NamedQuery(name = "Transaction.findByCreationDate", query = "SELECT t FROM Transaction t WHERE t.creationDate = :creationDate"),
@NamedQuery(name = "Transaction.findByAmount", query = "SELECT t FROM Transaction t WHERE t.amount = :amount")})
public class Transaction implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "ID")
private Integer id;
@Basic(optional = false)
@Column(name = "IDAccount")
private int iDAccount;
@Basic(optional = false)
@Column(name = "Description")
private String description;
@Basic(optional = false)
@Column(name = "CreationDate")
@Temporal(TemporalType.DATE)
private Date creationDate;
@Basic(optional = false)
@Column(name = "Amount")
private double amount;
public Transaction() {
}
public Transaction(Integer id) {
this.id = id;
}
public Transaction(Integer id, int iDAccount, String description, Date creationDate, double amount) {
this.id = id;
this.iDAccount = iDAccount;
this.description = description;
this.creationDate = creationDate;
this.amount = amount;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public int getIDAccount() {
return iDAccount;
}
public void setIDAccount(int iDAccount) {
this.iDAccount = iDAccount;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public double getAmount() {
return amount;
}
public void setAmount(double amount) {
this.amount = amount;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Transaction)) {
return false;
}
Transaction other = (Transaction) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "projetjava.db.Transaction[id=" + id + "]";
}
}
