MAKEMSI quickly and reliably creates MSI files in a non-programmatic way
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\->Troubleshooting->Build Time Problems->Common Build Problems and Their Solutions->Common Merge Module Issues->Schema Mismatch caused by a Merge Module

Schema Mismatch caused by a Merge Module

MAKEMSI defaults to table creation on demand which means that generally only tables that are used are created. In general this is OK, one exception is with some merge modules where a non-standard (or at least different schema) may have been used.

When a merge module is merged its schema is only used if a table needs to be created. The following shows the results after a merge module caused the creation of the "Class" and "TypeLib" tables:

ICE32        ERROR     Possible Mis-Aligned Foreign Keys
Feature.1 = s32
Class.Feature_ = s38
ICE32        ERROR     Possible Mis-Aligned Foreign Keys
Feature.1 = s32
TypeLib.Feature_ = s38

MAKEMSI defines a feature to be up to 32 characters while the merge module uses 38 characters. The solution to this is to create the tables before merging the merge module, for example:

<$TableCreate "Class"   ExistingOK="Y" DropExisting="N">
<$TableCreate "TypeLib" ExistingOK="Y" DropExisting="N">

The "ExistingOK" and "DropExisting" parameters were added for safety, we are doing this step because the tables don't exist however you may some time in the future add code which may create it and you would not want to lose its contents.


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Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006, 2007, 2008 & 2009 for the Windows SDK (Windows Installer) area.