"without failing on writing" I don't think there is a way that will work for all DBDs under DBI. e.g., ReadOnly in DBD::ODBC is mapped to the ODBC connection attribute READ_ONLY and you set it to give the driver a hint you will only be reading but it does not stop you writing.

In reply to Re: How to know if a DBI connexion is read-only? by mje
in thread How to know if a DBI connexion is read-only? by citromatik

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