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के साथ एक छोटी सी क्वेरी को पार्स करने में सिंटेक्स त्रुटि मैंने नेटबीन्स विज़ार्ड के साथ इकाई बीन बनाया और डेटाबेस से डेटा प्राप्त करने का प्रयास कर रहा हूं। इससे कोई फर्क नहीं पड़ता कि मैं किस SQL क्वेरी का उपयोग करता हूं, यह काम नहीं करता है।जेपीए
@NamedQuery(name = "Usr.findAll", query = "SELECT u FROM Usr u")
यह रिटर्न:: मैं नामित क्वेरी कि जादूगर द्वारा बनाया गया था उपयोग करने की कोशिश
Caused by: Exception [EclipseLink-8025] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Syntax error parsing the query [Usr.findAll], line 1, column 0: unexpected token [Usr].
अगर मैं कोशिश;
SELECT uid FROM usr;
मैं:
Caused by: java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager:
Exception Description: Syntax error parsing the query [SELECT uid FROM usr;], line 0, column -1: unexpected end of query.
Internal Exception: MismatchedTokenException(-1!=78)
और यहां तक कि अगर मैं कोशिश:
SELECT * FROM usr
मैं:
Caused by: Exception [EclipseLink-8025] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Syntax error parsing the query [SELECT * FROM usr], line 1, column 7: unexpected token [*].
डेटा प्राप्त करने के लिए मेरी लाइन है:
@PersistenceContext
EntityManager em;
....
em=Persistence.createEntityManagerFactory("SchoolPU").createEntityManager();
List users = em.createQuery("SELECT * FROM usr").getResultList();
कोई भी इस छोटी समस्या के साथ मेरी मदद कर सकता है?
Usr इकाई वर्ग:
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
/**
*
* @author danizmax
*/
@Entity
@Table(name = "USR")
@NamedQueries({
@NamedQuery(name = "Usr.findAll", query = "SELECT u FROM Usr u"),
@NamedQuery(name = "Usr.findByUid", query = "SELECT u FROM Usr u WHERE u.uid = :uid"),
@NamedQuery(name = "Usr.findByPassword", query = "SELECT u FROM Usr u WHERE u.password = :password"),
@NamedQuery(name = "Usr.findByFistname", query = "SELECT u FROM Usr u WHERE u.fistname = :fistname"),
@NamedQuery(name = "Usr.findByLastname", query = "SELECT u FROM Usr u WHERE u.lastname = :lastname"),
@NamedQuery(name = "Usr.findByAddress1", query = "SELECT u FROM Usr u WHERE u.address1 = :address1"),
@NamedQuery(name = "Usr.findByAddress2", query = "SELECT u FROM Usr u WHERE u.address2 = :address2"),
@NamedQuery(name = "Usr.findByPostcode", query = "SELECT u FROM Usr u WHERE u.postcode = :postcode"),
@NamedQuery(name = "Usr.findByEmail", query = "SELECT u FROM Usr u WHERE u.email = :email"),
@NamedQuery(name = "Usr.findByPhone", query = "SELECT u FROM Usr u WHERE u.phone = :phone")})
public class Usr implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@Column(name = "UID", nullable = false, length = 8)
private String uid;
@Basic(optional = false)
@Column(name = "PASSWORD", nullable = false, length = 20)
private String password;
@Basic(optional = false)
@Column(name = "FISTNAME", nullable = false, length = 30)
private String fistname;
@Basic(optional = false)
@Column(name = "LASTNAME", nullable = false, length = 60)
private String lastname;
@Basic(optional = false)
@Column(name = "ADDRESS1", nullable = false, length = 100)
private String address1;
@Column(name = "ADDRESS2", length = 100)
private String address2;
@Basic(optional = false)
@Lob
@Column(name = "CITY", nullable = false)
private byte[] city;
@Basic(optional = false)
@Column(name = "POSTCODE", nullable = false, length = 10)
private String postcode;
@Column(name = "EMAIL", length = 50)
private String email;
@Column(name = "PHONE")
private Integer phone;
public Usr() {
}
public Usr(String uid) {
this.uid = uid;
}
public Usr(String uid, String password, String fistname, String lastname, String address1, byte[] city, String postcode) {
this.uid = uid;
this.password = password;
this.fistname = fistname;
this.lastname = lastname;
this.address1 = address1;
this.city = city;
this.postcode = postcode;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getFistname() {
return fistname;
}
public void setFistname(String fistname) {
this.fistname = fistname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public String getAddress1() {
return address1;
}
public void setAddress1(String address1) {
this.address1 = address1;
}
public String getAddress2() {
return address2;
}
public void setAddress2(String address2) {
this.address2 = address2;
}
public byte[] getCity() {
return city;
}
public void setCity(byte[] city) {
this.city = city;
}
public String getPostcode() {
return postcode;
}
public void setPostcode(String postcode) {
this.postcode = postcode;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Integer getPhone() {
return phone;
}
public void setPhone(Integer phone) {
this.phone = phone;
}
@Override
public int hashCode() {
int hash = 0;
hash += (uid != null ? uid.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 Usr)) {
return false;
}
Usr other = (Usr) object;
if ((this.uid == null && other.uid != null) || (this.uid != null && !this.uid.equals(other.uid))) {
return false;
}
return true;
}
@Override
public String toString() {
return "org.danizmax.Usr[uid=" + uid + "]";
}
}
persistance.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="SchoolPU" transaction-type="JTA">
<jta-data-source>jdbc/school</jta-data-source>
<properties>
</properties>
</persistence-unit>
</persistence>
वर्ग जहां मैं इकाई का उपयोग करें:
import java.util.Iterator;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;
/**
*
* @author danizmax
*/
@Stateless
public class ValidatorBean {
@PersistenceContext
EntityManager em;
public ValidatorBean() {
}
public boolean validate(String user, String pass) {
List users = em.createQuery("SELECT * FROM usr").getResultList();
Iterator it = users.iterator();
//ignore the stupid validation it's only to try out JPA
while(it.hasNext()){
Usr u = (Usr) it.next();
if(u.getUid().equals(user) && u.getPassword().equals(pass)){
return true;
}
}
return false;
}
}
अद्यतन: आप निष्पक्ष रहने के लिए जो लोग आपके प्रयास का उत्तर देते हैं और इनाम देते हैं, अब मैं वास्तव में टी को सीखा तकनीक और वास्तविक दुनिया में इसका उपयोग करते हुए, मैंने इस जवाब को सबसे अच्छा जवाब देने के साथ बंद करने का फैसला किया जो कि मेरे सबसे संभावित समाधान था, मैंने अपने स्वयं को बहुत समय पहले पाया था।
मुझे एक समाधान मिला, लेकिन अब और याद नहीं है कि वास्तव में क्या था, केवल कोड में कास्टिंग के साथ कुछ करना था। अगर मुझे पता चलता है कि यह वास्तव में क्या था, तो मैं इसे एक उत्तर के रूप में पोस्ट करूंगा। – danizmax