I cannot seem to get an asynchronous connection to work. Am I missing
something obvious? Despite the call to
SQLSETPROP("Asychrounous",.T.), the SQLEXEC() locks until the entire
result set is returned, despite finishing with a 0 return value. I've
tried in VFP8 & 9SP1 & SP2 hitting a PostgreSQL database, with no luck.
The code below hits a table with 16,000 records. The first SQLEXEC
call takes about 5 minutes to finish executing and returns a 0. The
next call returns a 1 and finishes immediately. Reccount() shows
16,000 for both calls.
What's going on? Could it be a bug specific to PostgreSQL and/or
their ODBC driver?
CLOSE ALL
CLEAR
LOCAL lcDriver, lcServer, lcUserId, lcPassword, lcCStr, lnOption,
lcOptionString, lcSQL
lcDriver = "PostgreSQL ANSI"
lcServer = "VXP-POSTGRES"
lcUserId = "xxx"
lcPassword = "xxx"
lcDatabase = "test"
lnOption = 0
lcOptionString = ";OPTION=" + ALLTRIM(STR(lnOption))
lcCStr =
"DRIVER="+lcDriver+";SERVER="+lcServer+";DATABASE="+lcDatabase+";UID="+lcUserID+";PWD="+lcPassword+";B9=0"
lcCStr = lcCStr + lcOptionString
?lcCStr
nHandle = SQLSTRINGCONNECT(lcCStr)
?"Set Asycn Mode"
??SQLSETPROP(nHandle,"Asynchronous",.T.)
lcSQL = "SELECT * FROM email ORDER BY sent"
?lcSQL
?"First Call:"
??SQLEXEC(nHandle,lcSQL,"csrTest")
?"Rec Count:"
?RECCOUNT("csrTest")
?"Second Call:"
??SQLEXEC(nHandle,lcSQL,"csrTest")
?"Rec Count:"
??RECCOUNT("csrTest")
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