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我正在開發Java Web應用程序，我使用的是netbeans 8作爲IDE，glassfissh作爲服務器我試圖從數據庫中的Users表中提取數據我需要使用JPA作爲數據通過netbeans的，其中有一些行被從執行查詢返回的從一個表中Derby不返回行的MySQL數據庫生成從表中用於此目的的模型層，JPA實體在數據庫不爲空時返回空值
編輯 雖然Entity數據庫，它是空的
在下面我提供了由netbeans IDE
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;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;
/**
*
* @author Home
*/
@Entity
@Table(name = "users")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Users.findAll", query = "SELECT u FROM Users u"),
@NamedQuery(name = "Users.findById", query = "SELECT u FROM Users u WHERE u.id = :id"),
@NamedQuery(name = "Users.findByName", query = "SELECT u FROM Users u WHERE u.name = :name"),
@NamedQuery(name = "Users.findByEmail", query = "SELECT u FROM Users u WHERE u.email = :email"),
@NamedQuery(name = "Users.findByPassword", query = "SELECT u FROM Users u WHERE u.password = :password"),
@NamedQuery(name = "Users.findByRememberToken", query = "SELECT u FROM Users u WHERE u.rememberToken = :rememberToken"),
@NamedQuery(name = "Users.findByCreatedAt", query = "SELECT u FROM Users u WHERE u.createdAt = :createdAt"),
@NamedQuery(name = "Users.findByUpdatedAt", query = "SELECT u FROM Users u WHERE u.updatedAt = :updatedAt")})
public class Users 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)
@NotNull
@Size(min = 1, max = 255)
@Column(name = "name")
private String name;
// @Pattern(regexp="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", message="Invalid email")//if the field contains email address consider using this annotation to enforce field validation
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 255)
@Column(name = "email")
private String email;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 255)
@Column(name = "password")
private String password;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 255)
@Column(name = "remember_token")
private String rememberToken;
@Basic(optional = false)
@NotNull
@Column(name = "created_at")
@Temporal(TemporalType.TIMESTAMP)
private Date createdAt;
@Basic(optional = false)
@NotNull
@Column(name = "updated_At")
@Temporal(TemporalType.TIMESTAMP)
private Date updatedAt;
public Users() {
}
public Users(Integer id) {
this.id = id;
}
public Users(Integer id, String name, String email, String password, String rememberToken, Date createdAt, Date updatedAt) {
this.id = id;
this.name = name;
this.email = email;
this.password = password;
this.rememberToken = rememberToken;
this.createdAt = createdAt;
this.updatedAt = updatedAt;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getRememberToken() {
return rememberToken;
}
public void setRememberToken(String rememberToken) {
this.rememberToken = rememberToken;
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public Date getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(Date updatedAt) {
this.updatedAt = updatedAt;
}
@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 Users)) {
return false;
}
Users other = (Users) 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 "some string";
}
}
自動生成我的實體的Java Bean的代碼，這是我Servlet代碼，我試圖讓數據庫的Users
@PersistenceUnit
EntityManagerFactory emf;
emf.createEntityManager().createNamedQuery("Users.findAll").getResultList().size()
但ResultList沒有從數據庫中獲取任何數據 這是來自服務器的日誌，顯示iit已連接到Derby得到控制而根據配置，我認爲它應該連接到MySQL這是我glassfish-resources.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE resources PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Resource Definitions//EN" "http://glassfish.org/dtds/glassfish-resources_1_5.dtd">
<resources>
<jdbc-connection-pool allow-non-component-callers="false" associate-with-thread="false"
connection-creation-retry-attempts="0" connection-creation-retry-interval-in-seconds="10"
connection-leak-reclaim="false" connection-leak-timeout-in-seconds="0" connection-validation-method="auto-commit"
datasource-classname="com.mysql.jdbc.jdbc2.optional.MysqlDataSource" fail-all-connections="false"
idle-timeout-in-seconds="300" is-connection-validation-required="false" is-isolation-level-guaranteed="true"
lazy-connection-association="false" lazy-connection-enlistment="false" match-connections="false"
max-connection-usage-count="0" max-pool-size="32" max-wait-time-in-millis="60000" name="mysql_mysql_rootPool"
non-transactional-connections="false" pool-resize-quantity="2" res-type="javax.sql.ConnectionPoolDataSource"
statement-timeout-in-seconds="-1" steady-pool-size="8" validate-atmost-once-period-in-seconds="0"
wrap-jdbc-objects="false">
<property name="serverName" value="localhost"/>
<property name="portNumber" value="3306"/>
<property name="databaseName" value="mydatabase"/>
<property name="User" value="root"/>
<property name="Password" value=""/>
<property name="URL" value="jdbc:mysql://localhost:3306/mydatabase"/>
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
</jdbc-connection-pool>
<jdbc-resource enabled="true" jndi-name="realestateConnection" object-type="user" pool-name="mysql_mysql_rootPool"/>
</resources>
Config: Connected: jdbc:derby://localhost:1527/sun-appserv-samples;;create=true
User: APP
Database: Apache Derby Version: 10.10.1.3 - (1557168)
Driver: Apache Derby Network Client JDBC Driver Version: 10.10.2.0 - (1582446)
編輯 ，這是我persistence.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="architectsPU" transaction-type="JTA">
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.schema-generation.database.action" value="create"/>
<property name="eclipselink.logging.level" value="FINE"/>
</properties>
</persistence-unit>
</persistence>
編輯 請幫助我如何解決這個問題，以及如何改變配置，以便在部署文件時連接到正確的數據庫，告訴服務器連接哪個數據源與persistence.xml相同？如果不是位於哪裏？
可以打開JPA的日誌然後檢查這些日誌 – andy
@andy好，謝謝讓我看看是否有幫助 – Siavosh
@andy檢查日誌和編輯的問題，請您再檢查一遍 – Siavosh