Find方法 Exist方法

在ax中新建表时，通常要实现这两个方法，以便于重用。下面贴出Find与Exists方法示例，摘自表InvenBatch

Find方法：

static InventBatch find(InventBatchId _inventBatchId, ItemId _itemId, boolean _forupdate = false)
{
    InventBatch inventBatch;
    ;
    inventBatch.selectForUpdate(_forupdate);

    if (_inventBatchId)
    {
        select firstonly inventBatch
            index hint itemBatchIdx
            where inventBatch.ItemId    == _itemId       &&
                  inventBatch.InventBatchId   == _inventBatchId;

    }

    return inventBatch;
}

Exists方法:

static boolean exist(
    ItemId          itemId,
    InventBatchId   batchId
    )
{
    return (select inventBatch
                index hint itemBatchIdx
                where inventBatch.ItemId        == itemId    &&
                      inventBatch.InventBatchId == batchId).RecId != 0;
}