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

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

1.準備插入的視圖VO

此VO 只是插入行，不從數據庫中查詢。則此時必須 setMaxFetchSize(0)進行初始化。

AM 中的邏輯代碼：

//檢查并確保 VO 中沒有行，在插入之前進行初始化

if (vo.getFetchedRowCount() == 0)

{

vo.setMaxFetchSize(0);

}

// Perform insert

　Row row = vo.createRow();

vo.insertRow(row);

//如果row是事物的，則進行此設置

row.setNewRowState(Row.STATUS_INITIALIZED);

2.EO 中的create

(1).簡單的單表create

// AM

public void create()

{

OAViewObject vo = getSuppliersVO();

vo.insertRow(vo.createRow());

//插入行之后重新設置row狀態

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 從表序列中獲得

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

 setSupplierId(supplierId);

// Start date設置為當前時間
 setStartDate(transaction.getCurrentDBDate());

} 

給table插入新的行后，立即設置 setNewRowState(STATUS_INITIALIZED)

這樣的話BC4J 就會刪除EO相對應的事物和驗證監聽，因此設置后將不會驗證或提交給數據庫

（2）主從關系表的create

3.EO 中驗證主鍵是否唯一 在SupplierEOImpl

public void setSupplierId(Number value)

{ 

if (value != null)

 {

     //Supplier id 必須唯一，findByPrimaryKey()確保檢查所有的suppliers，首先它檢查entity緩存，然后檢查數據庫

  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 的刪除

/*刪除采購訂單從PoSimpleSummaryVO根據poHeaderId參數*/

public Boolean delete(String poHeaderId)

{

int poToDelete = Integer.parseInt(poHeaderId);

OAViewObject vo = getPoSimpleSummaryVO();

PoSimpleSummaryVORowImpl row = null;

//緩存中的行數

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 驗證name 不為空，且唯一

SupplierEOImpl

public void setName(String value)
{
    if ((value != null) || (!("".equals(value.trim()))))
  {
    // 驗證name是否唯一，將先從entity 緩存，然后在數據庫檢查.
    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();
      
      // 如果數據庫可以查詢出來相同的name和ID則拋異常.

      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 
      }
    }
     
    // 檢查數據庫

        OADBTransaction transaction = getOADBTransaction();
    OAApplicationModule vam;
    //查看am是否創建，如果沒有創建，則在事物中創建.
    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);
} 

事務鎖

// In the application module...

OADBTransaction txn = getOADBTransaction();

txn.setLockingMode(Transaction.LOCK_PESSIMISTIC);

事物提交：

getTransaction()Commit();

事物回滾：

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.

總結

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