how to user the attribute" valueMode"?

[chenkezhong]

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hello, everyone: 

i have a little difficult in understanding the load xml definition.there is a importDefinition lag in the load examples and

 

the follow is the code:

 

<importDefinition name="RelationBooks" tableName="BOOKLINKS" logMode="normal" objectIDIncrement="27" >
<valueColumns>
 <valueColumn sourceColumnName="KEYVALUE" targetTableName="BOOKLINKS" targetColumnName="KEYVALUE" targetTableID="0"

valueMode="Key"/>
 <valueColumn sourceColumnName="TYPEKEY" targetTableName="BOOKS" targetColumnName="KEYVALUE" targetTableID="1"

valueMode="Key"/>
 <valueColumn sourceColumnName="BOOKKEY" targetTableName="BOOKLINKS" targetColumnName="KEYVALUE" targetTableID="2"

valueMode="Key"/>
 <valueColumn sourceColumnName="BOOKTYPEKEY" targetTableName="BOOKS" targetColumnName="KEYVALUE" targetTableID="3"

valueMode="Key"/>
</valueColumns>

 

<relationColumns>
 <relationColumn relationSourceTableName="BOOKLINKS" relationSourceTableID="2" relationTargetTableName="BOOKLINKS"

relationTargetColumnName="BOOKLINKSOID" relationTargetTableID="0" relationMode="Overwrite" defaultValue="SELECT oid FROM

BOOKLINKS WHERE KEYVALUE='HOME'"/>

</relationColumns>

 

<tables>
 <table tableName="BOOKS" tableID="1" insert="false" tableMode="Cache" oidLogic="true"/>
 <table tableName="BOOKLINKS" tableID="0" insert="false" tableMode="Cache" oidLogic="true"/>
 <table tableName="BOOKS" tableID="3" insert="false" tableMode="Cache" oidLogic="true"/>
 <table tableName="BOOKLINKS" tableID="2" insert="false" tableMode="Cache" oidLogic="true"/>
</tables>

 

</importDefinition>

 

I can not understand what these code affect the load process? Especially the attribute "valueMode",such as:
<valueColumn sourceColumnName="BOOKTYPEKEY" targetTableName="BOOKS" targetColumnName="KEYVALUE" targetTableID="3"

valueMode="Key"/>.

and the document only tells that ‘Key mode’ - defines key column of the target table used for selection of rows , and what does this mean?

I appreciate your time and attention sincerely.

 

Eric

 

 

 

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