patch has constraint method for sql server driver #170
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What did this pull request do?
In this PR, the HasConstraint function has been patched, to query the correct table (sys.check_constraints) in SQL server.
User Case Description
I am using check constraints with GORM, however, every time I run the auto migrate, it will try to create the check constraints over and over again, even though they already exist. After some investigation, I came across this query, which will run on the wrong table: sys.foreign_keys, which should be: sys.check_constraints.