我试图让我的模型使用我的MySQL数据库。目前他们不是。它们是使用允许我从数据库表创建模型的选项在Netbeans中创建的。我不知道如何让它在运行时使用我的MySQL表。有什么建议么?mysql中的Java持久性单元
我的模型
@Entity
@Table(name = "content")
@NamedQueries({
@NamedQuery(name = "Content.findAll", query = "SELECT c FROM Content c"),
@NamedQuery(name = "Content.findById", query = "SELECT c FROM Content c WHERE c.id = :id"),
@NamedQuery(name = "Content.findByUserId", query = "SELECT c FROM Content c WHERE c.userId = :userId")})
public class Content implements java.io.Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@NotNull
@Column(name = "id")
private Integer id;
@Basic(optional = false)
@NotNull
@Column(name = "user_id")
private int userId;
@Basic(optional = false)
@NotNull
@Lob
@Size(min = 1, max = 65535)
@Column(name = "body")
private String body;
public Content() {
}
public Content(Integer id) {
this.id = id;
}
public Content(Integer id, int userId, String body) {
this.id = id;
this.userId = userId;
this.body = body;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
@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 Content)) {
return false;
}
Content other = (Content) 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 "model.Content[ id=" + id + " ]";
}
}
我希望这个代码列出所有在我的数据库中的内容,但它列出什么。我的假设是,它的使用一些其他的数据库,但我“不能完全肯定如何对它进行测试。
<ol> <%
List<Content> contentList = (List<Content>)request.getAttribute("content");
if (contentList != null) {
for (Content content : contentList) { %>
<li> <%= content %> </li> <%
}
} %>
</ol>
你想做什么?你面临什么问题?你的查询到底是什么?请具体提一下。 – Lion 2012-01-02 21:25:04
@Lion - 这是更好吗? – Webnet 2012-01-02 21:30:02
那么'request.getAttribute(“content”);'为了什么?什么是检索? – Lion 2012-01-02 21:34:58