These are really interesting, especially for working with external databases, but I’m having a hard time thinking of common use cases for EE databases that aren’t met by onboard tag ‘sugar’. Can you suggest one or several cases for the Insert Entries plugin?
The initial request that led to this plugin was someone wanting to be able to add an EE entry using a SAEF, then, once the data is submitted, update another database with some or all of that new content. To accomplish this, the Insert Entries plugin can be placed in the SAEF’s return template, updating the other db with the info just added.
Regarding onboard tags, none of them allow working with external databases, so far as I know. And for working with the EE database, the Query module—which would be the next easiest way to do these things—only allows SELECT; there’s no INSERT nor UPDATE.
The only way that I could see to achieve the Update Entries functionality without the plugin is using PHP in the template that would connect to a database. I haven’t tried this as it seemed to require not much less effort to handle it once than to handle it once and for all in a plugin.
Writ large though, I think the plugin is most useful for enabling EE to interact with other MySQL-based systems.