[英]how to convert mysql query to JPQL
如何將 MYSQL 查詢轉換為 JPQL 查詢? 除了轉換之外,是否可以使用相同的查詢來更新 Java swing 程序中的實體?
mysql 查詢select * from project.newproject; update newproject set pedate = date_add(psdate, interval duration day)
select * from project.newproject; update newproject set pedate = date_add(psdate, interval duration day)
我的實體 class 如下所示
@Entity
@Table(name = "newproject")
@XmlRootElement
@Transient
private PropertyChangeSupport changeSupport = new PropertyChangeSupport(this);
private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@Column(name = "pid")
private Integer pid;
@Basic(optional = false)
@Column(name = "pname")
private String pname;
@Basic(optional = false)
@Column(name = "psdate")
@Temporal(TemporalType.DATE)
private Date psdate;
@Basic(optional = false)
@Column(name = "duration")
private int duration;
@Column(name = "pedate")
@Temporal(TemporalType.DATE)
private Date pedate;
我更改了 MYSQL 查詢如下更新所選行
`update newproject
set pedate = date_add(psdate, interval duration day)
where pid = newproject.pid;`
並在 Java 中使用 createnativeQuery 更新選定的行
Newproject_1 p = ProjectPUEntityManager.find(Newproject_1.class, 1);
ProjectPUEntityManager.getTransaction().begin();
Query query = ProjectPUEntityManager.createNativeQuery("update newproject \n" +
"set pedate = date_add(psdate, interval duration day)\n" +
"where pid = newproject.pid;");
int count = query.executeUpdate();
ProjectPUEntityManager.merge(p);
ProjectPUEntityManager.getTransaction().commit();
JOptionPane.showMessageDialog(rootPane, "Update End Date");
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