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POCreating queries using Criteria API (JPA 2.0)
 

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    <p>I'm trying to create a query with the Criteria API from JPA 2.0, but I can't make it work.</p> <p>The problem is with the "between" conditional method. I read <a href="http://docs.sun.com/app/docs/doc/820-7627/gjitv" rel="noreferrer">some documentation</a> to know how I have to do it, but since I'm discovering JPA, I don't understand why it does not work.</p> <p>First, I can't see "creationDate" which should appear when I write "Transaction_."</p> <p>I thought it was maybe normal, since I read the metamodel was generated at runtime, so I tried to use 'Foo_.getDeclaredSingularAttribute("value")' instead of 'Foo_.value', but it still doesn't work at all.</p> <p>Here is my code :</p> <pre><code>public List&lt;Transaction&gt; getTransactions(Date startDate, Date endDate) { EntityManager em = getEntityManager(); try { CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery&lt;Transaction&gt; cq = cb.createQuery(Transaction.class); Metamodel m = em.getMetamodel(); EntityType&lt;Transaction&gt; Transaction_ = m.entity(Transaction.class); Root&lt;Transaction&gt; 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&lt;Transaction&gt; result = em.createQuery(cq).getResultList(); return result; } finally { em.close(); } } </code></pre> <p>Can someone help me to figure this out? Thanks.</p> <p>EDIT : here is the Transaction source (almost nothing in it, since it was automatically generated by Netbeans, from my database)</p> <pre><code>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 &amp;&amp; other.id != null) || (this.id != null &amp;&amp; !this.id.equals(other.id))) { return false; } return true; } @Override public String toString() { return "projetjava.db.Transaction[id=" + id + "]"; } } </code></pre>
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