ShowErrorStatement doesn't work on do("") requests about dbdpg HOT 4 CLOSED

At first glance, I don't know if this is possible. The problem is that DBI wants to call ParamValues on the current handle. For statement handles, this is no problem, as the placeholders are stored in the sth structure (which ParamValues walks through via dbd_st_FETCH_attrib). For database handles, however, we create a very local and temporary imp_sth inside of Pg.xs, which goes out of scope well before DBI asks $dbh for ParamValues (which it cannot handle anyway, as it knows nothing about it). We could in theory jump through some hoops to have imp_dbh start storing detailed information from its temporary imp_sth creation, but seems a lot of trouble for something so trivial.

I will expand the documentation to make this clearer, however.

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It would help debugging a lot to have parameters dumped together with the error. Or at the very least fix the documentation with example how to rewrite do() calls into something that respects ShowErrorStatement..

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I've sent a pull request please review. Please disregard d636fc6 , it's still there because only github didn't roll it back when I did 'git reset'.

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Added as of version 3.9.0

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