标准的EO验证提示错误不够完整，抛出自定义的异常。

 我们通常会在EO里面对某些数据进行验证，比如在邀请供应商注册的时候，ORACLE标准逻辑会验证被邀请的供应商是否已经存在。

其验证逻辑在

oracle.apps.pos.schema.server.SupplierRegEOImpl

    public void setSupplierName(String value)
    {
        SupplierRegEntityExpert supplierregentityexpert = getSupplierRegEntityExpert(getOADBTransaction());
        if (!supplierregentityexpert.isSupplierValid(value, getSupplierRegId()))
        {
            throw new OAAttrValException(121, getEntityDef().getFullName(), getPrimaryKey(), "SupplierName", value, "POS", "POS_SUPPREG_EO_ERR1");
        } else
        {
            setAttributeInternal(2, value);
            return;
        }
    }

现由于客户觉得标准的异常提示不够明显，无法区分此供应商是已经正式存在的供应商，还是已经被其他人邀请过的供应商。

所以现决定在保存的时候根据输入的供应商名称进行逻辑判断。

经验证，逻辑判断不能写在processFormRequest中，会先执行EO中的验证。

不过可以写在processFormData中，因为processFormData中的方法是在POST阶段执行，所以不会触发EO中的验证。

新建客户化CO继承原有标准CO

public class CuxSuppRegisterSupplierCO extends SuppRegisterSupplierCO {

}

    public void processFormData(OAPageContext pageContext,OAWebBean webBean){
        super.processFormData(pageContext, webBean);
        String str1 = pageContext.getParameter("event");
        if (("sendInvitation".equals(str1)) || ("SaveNContinueBtnEvent".equals(str1)))
        {
          
            OAViewObject SupplierRequestsVO = (OAViewObject)pageContext.getApplicationModule((OAWebBean)webBean.findChildRecursive("RegSupplierRN")).findViewObject("SupplierRequestsVO");
            String SupplierName = pageContext.getParameter("SupplierName");
            Number SupplierRegId = (Number)SupplierRequestsVO.first().getAttribute("SupplierRegId");
            LogUtil.of("validSupplierName ",pageContext).print(pageContext);
            validSupplierName(pageContext,webBean,SupplierName,SupplierRegId);
        }
        
    }

    public void validSupplierName(OAPageContext pageContext,OAWebBean webBean, String SupplierName,Number SupplierRegId){
        LogUtil.of("validSupplierName fangfa ",pageContext).print(pageContext);
        OraclePreparedStatement oraclepreparedstatement = null;
        OracleResultSet oracleresultset = null;
        OAApplicationModule am = pageContext.getApplicationModule(webBean);
        try{
            oraclepreparedstatement = (OraclePreparedStatement)am.getOADBTransaction().createPreparedStatement(" select vendor_id 
" + 
                                                                                                                "from po_vendors  
" + 
                                                                                                                "where upper(vendor_name) = upper(:1)
" + 
                                                                                                                "and (start_date_active < sysdate OR start_date_active is null) 
" + 
                                                                                                                "and (end_date_active > sysdate OR end_date_active is null) 
" + 
                                                                                                                "and rownum = 1", 1);    
            oraclepreparedstatement.setObject(1,SupplierName);        
            oracleresultset = (OracleResultSet)oraclepreparedstatement.executeQuery();
            if(oracleresultset.next()){
                throw new OAException("POS_SUPPREG_EO_ERR1",OAException.ERROR);
            }
        }
        catch(Exception exception1)
        {
                throw OAException.wrapperException(exception1);
        }
        
        try{
            oraclepreparedstatement = (OraclePreparedStatement)am.getOADBTransaction().createPreparedStatement("SELECT hou.attribute18,
" + 
                                                                                                                "       papf.full_name
" + 
                                                                                                                "  FROM pos_supplier_registrations psr,
" + 
                                                                                                                "       hr_all_organization_units  hou,
" + 
                                                                                                                "       fnd_user                   fu,
" + 
                                                                                                                "       per_all_people_f           papf
" + 
                                                                                                                " WHERE upper(psr.supplier_name) = upper(:1)
" + 
                                                                                                                "   AND psr.supplier_reg_id <> :2
" + 
                                                                                                                "   AND psr.registration_status NOT IN ('REJECTED',
" + 
                                                                                                                "                                       'DRAFT',
" + 
                                                                                                                "                                       'RIF_SUPPLIER')
" + 
                                                                                                                "   AND rownum = 1
" + 
                                                                                                                "   AND psr.created_by = fu.user_id(+)
" + 
                                                                                                                "   AND psr.ou_id = hou.organization_id
" + 
                                                                                                                "   AND fu.employee_id = papf.person_id(+)
" + 
                                                                                                                "   AND SYSDATE BETWEEN nvl(papf.effective_start_date,
" + 
                                                                                                                "                           SYSDATE - 1) AND nvl(papf.effective_end_date,
" + 
                                                                                                                "                                                SYSDATE + 1)
", 2);    
            oraclepreparedstatement.setObject(1,SupplierName);       
            oraclepreparedstatement.setObject(2,SupplierRegId);
            oracleresultset = (OracleResultSet)oraclepreparedstatement.executeQuery();
            if(oracleresultset.next()){                
                String OrgName = oracleresultset.getString(1);
                String FullName = oracleresultset.getString(2);
                MessageToken[] tokens = { new MessageToken("ORG_NAME", OrgName),
                                          new MessageToken("FULL_NAME", FullName) }; 
                OAException exceptionMessage = new OAException("CUX","CUX_SUPPLIER_HAS_BEEN_INVITED",tokens,OAException.ERROR,null);
                throw exceptionMessage;   //PS1.使用throw直接抛出异常，会导致页面上直接基于EO的字段的数据不会被保留,且不会抛出EO中的验证。
//                pageContext.putDialogMessage(exceptionMessage);  //PS2.使用putDialogMessage()，页面上的数据被保留，且执行EO中的验证并抛出。
            }
        }
        catch(Exception exception1)
        {
                throw OAException.wrapperException(exception1);
        }
        
        
    }

参考资料：

1.重新整理后的Oracle OAF学习笔记——5.应用构建基础之实现控制器

2.OAF—Row的状态