Question

Is there a way to create dynamic column (as a key/value) names using the values returned
from the query throw DIH (DataImportHandler)?

For example:

<entity name="foo" dataSource="my_database" query="select key,value from foo where id=${item.id}">
   <field column="${foo.key}" value="${foo.value}" name="${foo.key}_s"/>
</entity>

??

Answer 1

Use ScriptTransformer –

Example –

Data Config – Add custom field –

<script><![CDATA[
        function addfield(row){
            var fieldName = row.get('key') + "_s"
            row.put(fieldName, row.get('value'));
            return row;
        }
]]></script>

Entity mapping –

<entity name="foo" dataSource="my_database" transformer="script:addfield" query="select key,value from foo where id=${item.id}">
    ......
</entity>