# Data mapping related topics

### In this section

* [Migrating IO Database functions to tHMap Multi-Output Database Connections](https://help.qlik.com/talend/en-US/components/7.2/data-mapping/migrating-io-database-functions-to-thmap-multi-output-database-connections)
* [Migrating from DatabaseLookup to tHMap](https://help.qlik.com/talend/en-US/components/7.2/data-mapping/migrating-from-databaselookup-to-thmap)
* [Specifying a map variable and alternate map in tHMap](https://help.qlik.com/talend/en-US/components/7.2/data-mapping/specifying-map-variable-and-alternate-map-in-thmap)
* [Using external XSL transformation in Talend Data Mapper](https://help.qlik.com/talend/en-US/components/7.2/data-mapping/using-external-xsl-transformation-in-talend-data-mapper)