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What is the correct way to reconnect to database using Qt4 upon disconnect?

I'm using Sql Server 2012 over ODBC. If I detect disconnection using SELECT 1 query, and then do

db.close();
db.open()

I receive exceptions on other opened SqlQueries (in driver) which are trying to use next() method.

If I do nothing with database, only trying to execute new queries using the same database - any exec() returns false with warning "Connection error".

dE fENDER
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