OAF 中的EO 和VO

EO ：oracle.apps.fnd.framework.server.OAEntityImpl

VO：oracle.apps.fnd.framework.server.OAViewRowImpl

1.准备插入的视图VO

此VO 只是插入行，不从数据库中查询。则此时必须 setMaxFetchSize(0)进行初始化。

AM 中的逻辑代码：

//检查并确保 VO 中没有行，在插入之前进行初始化

if (vo.getFetchedRowCount() == 0)

{

vo.setMaxFetchSize(0);

}

// Perform insert

　Row row = vo.createRow();

vo.insertRow(row);

//如果row是事物的，则进行此设置

row.setNewRowState(Row.STATUS_INITIALIZED);

2.EO 中的create  

(1).简单的单表create

// AM

public void create()

{

OAViewObject vo = getSuppliersVO();

vo.insertRow(vo.createRow());

//插入行之后重新设置row状态

vo.setNewRowState(Row.STATUS_INITIALIZED);

}

/** 在EOImpl中可以初始化插入的行 */

Public void create(AttributeList attributeList)

{

  super.create(attributeList); 

  OADBTransaction transaction = getOADBTransaction();

  // ID 从表序列中获得

  Number supplierId = transaction.getSequenceValue("FWK_TBX_SUPPLIERS_S");

  setSupplierId(supplierId);

  // Start date设置为当前时间
  setStartDate(transaction.getCurrentDBDate());

}  

给table插入新的行后，立即设置 setNewRowState(STATUS_INITIALIZED)

这样的话BC4J 就会删除EO相对应的事物和验证监听，因此设置后将不会验证或提交给数据库

（2）主从关系表的create

3.EO 中验证主键是否唯一 在SupplierEOImpl

public void setSupplierId(Number value)

{ 

  if (value != null)

  {

     //Supplier id 必须唯一，findByPrimaryKey()确保检查所有的suppliers，首先它检查entity缓存，然后检查数据库

   OADBTransaction transaction = getOADBTransaction();

    Object[] supplierKey = {value};

    EntityDefImpl supplierDefinition = SupplierEOImpl.getDefinitionObject();

    SupplierEOImpl supplier = 

      (SupplierEOImpl)supplierDefinition.findByPrimaryKey(transaction, new Key(supplierKey));

    if (supplier != null)

    {

      throw new OAAttrValException(OAException.TYP_ENTITY_OBJECT,

             getEntityDef().getFullName(), // EO name

             getPrimaryKey(), // EO PK

             "SupplierId", // Attribute Name

             value, // Bad attribute value

             "ICX", // Message application short name

             "FWK_TBX_T_SUP_ID_UNIQUE"); // Message name 

    }

  }

  setAttributeInternal(SUPPLIERID, value);

}  

4. EO 的删除

/*删除采购订单从PoSimpleSummaryVO根据poHeaderId 参数*/

public Boolean delete(String poHeaderId)

{

int poToDelete = Integer.parseInt(poHeaderId);

OAViewObject vo = getPoSimpleSummaryVO();

PoSimpleSummaryVORowImpl row = null;

//缓存中的行数

int fetchedRowCount = vo.getFetchedRowCount();

boolean rowFound = false;

// 用iterator

RowSetIterator deleteIter = vo.createRowSetIterator("deleteIter");

if (fetchedRowCount > 0)

{

deleteIter.setRangeStart(0);

deleteIter.setRangeSize(fetchedRowCount);

for (int i = 0; i < fetchedRowCount; i++)

{

row = (PoSimpleSummaryVORowImpl)deleteIter.getRowAtRangeIndex(i);

// Number primaryKey = (Number)row.getAttribute("HeaderId");

Number primaryKey = row.getHeaderId();

if (primaryKey.compareTo(poToDelete) == 0)

{

row.remove();

rowFound = true;

getTransaction().commit();

break; // only one possible selected row in this case

}

}

}

// Always close iterators.

deleteIter.closeRowSetIterator();

return new Boolean(rowFound);

}

5.EO 验证name 不为空，且唯一

SupplierEOImpl

public void setName(String value)
{
    if ((value != null) || (!("".equals(value.trim()))))
  {
    // 验证name是否唯一，将先从entity 缓存，然后在数据库检查.
    com.sun.java.util.collections.Iterator supplierIterator =
      getEntityDef().getAllEntityInstancesIterator(getDBTransaction());
       Number currentId = getSupplierId();

       while ( supplierIterator.hasNext() )
    {
      SupplierEOImpl cachedSupplier = (SupplierEOImpl)supplierIterator.next();
      String cachedName = cachedSupplier.getName();
      Number cachedId = cachedSupplier.getSupplierId();

      // 如果数据库可以查询出来相同的name和ID则抛异常.

      If (cachedName != null && value.equalsIgnoreCase(cachedName) &&
        cachedId.compareTo(currentId) != 0 )
      {
        throw new OAAttrValException(OAException.TYP_ENTITY_OBJECT,
                               getEntityDef().getFullName(), // EO name
                               getPrimaryKey(), // EO PK
                               "Name", // Attribute Name
                               value, // Attribute value
                               "ICX", // Message product short name
                               "FWK_TBX_T_SUP_DUP_NAME"); // Message name
      }
    }

    // 检查数据库

        OADBTransaction transaction = getOADBTransaction();
    OAApplicationModule vam;
    //查看am是否创建，如果没有创建，则在事物中创建.
    vam = (OAApplicationModule)transaction.findApplicationModule("supplierVAM");
    if (vam == null)
    {
      vam =
      (OAApplicationModule)transaction.createApplicationModule("supplierVAM",
         "oracle.apps.fnd.framework.toolbox.schema.server.SupplierVAM");
    }
    SupplierNameVVOImpl valNameVo = (SupplierNameVVOImpl)vam.findViewObject("SupplierNameVVO");
    valNameVo.initQuery(value);
    if (valNameVo.hasNext())
    {
      throw new OAAttrValException(OAException.TYP_ENTITY_OBJECT,
            getEntityDef().getFullName(), // EO name
            getPrimaryKey(), // EO PK
            "Name", // Attribute Name
            value, // Attribute value
            "ICX", // Message application short name
            "FWK_TBX_T_SUP_DUP_NAME"); // Message name
    }
  }
  setAttributeInternal(NAME, value);
} 

事务锁

// In the application module...

OADBTransaction txn = getOADBTransaction();

txn.setLockingMode(Transaction.LOCK_PESSIMISTIC);

事物提交：

getTransaction()Commit();

事物回滚：

getTransaction().rollback()；

Entity State

• STATUS_NEW - the entity object is new in the current transaction.
• STATUS_DELETED - the entity object originated in the database and has been deleted in the current transaction.
• STATUS_MODIFIED - the entity object originated in the database and has been changed.
• STATUS_UNMODIFIED - the entity object originated in the database and has not been changed, or it has been changed and those changes have been committed.
• STATUS_DEAD - the entity object is new in the current transaction and it has been deleted.
• STATUS_INITIALIZED - the entity object is in a "temporary" state and will not be posted or validated.