在jpa中填充数据库中的数据表

Question

public List<MemberEntity> getMember() {
    EntityManagerFactory entityManagerFactory = Persistence
            .createEntityManagerFactory("PrimeEclipseLink");
    EntityManager entityManager = entityManagerFactory
            .createEntityManager();
    Query query = entityManager
            .createNativeQuery("Select * FROM member");
    memberEntities = (List<MemberEntity>)query.getResultList();
    return memberEntities;

}

我想从数据库中填充我的数据库。但它不起作用请帮助我:)当我点击列表按钮表填充像picture.by的方式，我的数据库包含3记录。为什么3零。

xhtml页面就在这里。

<h:form id="member">

<p:dataTable var="members" value="#{mainScreen.memberEntities}">
<p:column headerText="name">
<h:outputText value="#{memberEntity.name}" />
</p:column>
<p:column headerText="surname">
<h:outputText value="#{memberEntity.surname}" />
</p:column>
<p:column headerText="fathername">
<h:outputText value="#{memberEntity.fathername}" />
</p:column>
<p:column headerText="age">
<h:outputText value="#{memberEntity.age}" />
</p:column>
<p:column headerText="email">
<h:outputText value="#{memberEntity.email}" />
</p:column>
<p:column headerText="username">
<h:outputText value="#{memberEntity.username}" />
</p:column>
<p:column headerText="password">
<h:outputText value="#{memberEntity.password}" />
</p:column>

</p:dataTable>

</h:form>

`@ManagedBean

@Entity
@Table(name = "member")
public class MemberEntity {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int memberid;
private int age;
private String name;
private String surname;
private String fathername;
private String email;
private String username;
private String password;

public MemberEntity(int memberid, int age, String name, String surname,
        String fathername, String email, String username, String password) {
    super();
    this.memberid = memberid;
    this.age = age;
    this.name = name;
    this.surname = surname;
    this.fathername = fathername;
    this.email = email;
    this.username = username;
    this.password = password;
}

public MemberEntity() {
    super();
    // TODO Auto-generated constructor stub
}

public int getMemberid() {
    return memberid;
}

public void setMemberid(int memberid) {
    this.memberid = memberid;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getSurname() {
    return surname;
}

public void setSurname(String surname) {
    this.surname = surname;
}

public String getFathername() {
    return fathername;
}

public void setFathername(String fathername) {
    this.fathername = fathername;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

@Override
public String toString() {

    return "Member [memberid=" + memberid + ",name=" + name + ",surname="
            + surname + ",age=" + age + ",email=" + email + ",fathername="
            + fathername + ",username=" + username + ",password="
            + password + "]";
}

}

Answer 1

在p:dataTable var属性的名称为membres时，您使用的p:column值为memberEntity，因此您必须将其更改为members。

来自：

<p:column headerText="name">
    <h:outputText value="#{memberEntity.name}" />
</p:column>

致：

<p:column headerText="name">
    <h:outputText value="#{members.name}" />
</p:column>

Answer 2

我找到了解决方案。在 getMember（）方法而不是createNativeQuery（“Select * FROM member”）true ---＆gt; createNativeQuery（“Select * FROM members，MemberEntity.class）