我有一个实体，它在屏幕上显示为可以修改的输入框中的文本。当我提交点击保存的表单时，我希望我的 ejb3 组件处理数据并使用实体管理器持久化或合并它。但是由于某种原因，当我修改数据并点击保存时，数据会通过我的 ejb3 直接在数据库中更新，这当然是不可取的。我的代码如下所示
@Entity
@Table(name = "EMP")
public class Emp implements java.io.Serializable {
private short empno;
private Dept dept;
private String ename;
private String job;
private Short mgr;
private Date hiredate;
private BigDecimal sal;
private BigDecimal comm;
public Emp() {
}
public Emp(short empno) {
this.empno = empno;
}
public Emp(short empno, Dept dept, String ename, String job, Short mgr,
Date hiredate, BigDecimal sal, BigDecimal comm) {
this.empno = empno;
this.dept = dept;
this.ename = ename;
this.job = job;
this.mgr = mgr;
this.hiredate = hiredate;
this.sal = sal;
this.comm = comm;
}
@Id
@Column(name = "EMPNO", unique = true, nullable = false, precision = 4, scale = 0)
public short getEmpno() {
return this.empno;
}
public void setEmpno(short empno) {
this.empno = empno;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "DEPTNO")
public Dept getDept() {
return this.dept;
}
public void setDept(Dept dept) {
this.dept = dept;
}
@Column(name = "ENAME", length = 10)
@Length(max = 10)
public String getEname() {
return this.ename;
}
public void setEname(String ename) {
this.ename = ename;
}
@Column(name = "JOB", length = 9)
@Length(max = 9)
public String getJob() {
return this.job;
}
public void setJob(String job) {
this.job = job;
}
@Column(name = "MGR", precision = 4, scale = 0)
public Short getMgr() {
return this.mgr;
}
public void setMgr(Short mgr) {
this.mgr = mgr;
}
@Temporal(TemporalType.DATE)
@Column(name = "HIREDATE", length = 7)
public Date getHiredate() {
return this.hiredate;
}
public void setHiredate(Date hiredate) {
this.hiredate = hiredate;
}
@Column(name = "SAL", precision = 7)
public BigDecimal getSal() {
return this.sal;
}
public void setSal(BigDecimal sal) {
this.sal = sal;
}
@Column(name = "COMM", precision = 7)
public BigDecimal getComm() {
return this.comm;
}
public void setComm(BigDecimal comm) {
this.comm = comm;
}
}
@Stateful
@Name("workflow")
@Scope(ScopeType.CONVERSATION)
public class WorkflowBean implements Workflow
{
@Logger private Log log;
@In StatusMessages statusMessages;
@PersistenceContext(type=PersistenceContextType.EXTENDED)
EntityManager entityManager;
@Out(required=false)
Emp employee = new Emp();
@RequestParameter("empEmpno")
String empNo;
public void workflow()
{
log.info("workflow.workflow() action called");
statusMessages.add("workflow");
}
@End
public boolean save(){
entityManager.merge(emp);
entityManger.flush();
}
@Begin(join=true)
public boolean populateEmp(){
entityManager.setFlushMode(FlushModeType.COMMIT);
System.out.println("The Emp No. is---"+empNo);
int no = Integer.parseInt(empNo);
short emp =(short)no;
employee = entityManager.find(Emp.class, emp);
entityManager.flush();
return true;
}
public Emp getEmployee() {
return employee;
}
public void setEmployee(Emp employee) {
this.employee = employee;
}
// add additional action methods
public String getEmpNo() {
return empNo;
}
public void setEmpNo(String empNo) {
this.empNo = empNo;
}
@Remove
@Destroy
public void destroy() {
}
}
我的观点看起来像
<h:form id="emp" styleClass="edit">
<rich:panel>
<f:facet name="header">Edit Emp</f:facet>
<s:decorate id="empnoField" template="layout/edit.xhtml">
<ui:define name="label">Empno</ui:define>
<h:inputText id="empno"
required="true"
value="#{workflow.employee.empno}">
</h:inputText>
</s:decorate>
<s:decorate id="commField" template="layout/edit.xhtml">
<ui:define name="label">Comm</ui:define>
<h:inputText id="comm"
value="#{workflow.employee.comm}"
size="14">
</h:inputText>
</s:decorate>
<s:decorate id="enameField" template="layout/edit.xhtml">
<ui:define name="label">Ename</ui:define>
<h:inputText id="ename"
size="10"
maxlength="10"
value="#{workflow.employee.ename}">
</h:inputText>
</s:decorate>
<s:decorate id="hiredateField" template="layout/edit.xhtml">
<ui:define name="label">Hiredate</ui:define>
<rich:calendar id="hiredate"
value="#{workflow.employee.hiredate}" datePattern="MM/dd/yyyy" />
</s:decorate>
<s:decorate id="jobField" template="layout/edit.xhtml">
<ui:define name="label">Job</ui:define>
<h:inputText id="job"
size="9"
maxlength="9"
value="#{workflow.employee.job}">
</h:inputText>
</s:decorate>
<s:decorate id="mgrField" template="layout/edit.xhtml">
<ui:define name="label">Mgr</ui:define>
<h:inputText id="mgr"
value="#{workflow.employee.mgr}">
</h:inputText>
</s:decorate>
<s:decorate id="salField" template="layout/edit.xhtml">
<ui:define name="label">Sal</ui:define>
<h:inputText id="sal"
value="#{workflow.employee.sal}"
size="14">
</h:inputText>
</s:decorate>
<s:decorate id="deptField" template="layout/edit.xhtml">
<ui:define name="label">Department</ui:define>
<h:inputText id="dname"
value="#{workflow.deptName}">
</h:inputText>
</s:decorate>
<div style="clear:both">
<span class="required">*</span>
required fields
</div>
</rich:panel>
<div class="actionButtons">
<h:commandButton id="save"
value="Save"
action="#{workflow.save}"
rendered="true"/>
</div>
</h:form>