sqlcounter

[Edgars]

Hello list!
almost made one counter by myself,but it functions like simple 
Session-Timeout. What should i add to this query not to allow user log 
in after the time returned by query is  >= then one set in the data base 
for the user?

sqlcounter hours {
           counter-name=Hours-Counter
           check-name=Hours
           sqlmod-inst=sqlcca3
           key=User-Name
           reset=never
           query="Select (NOW()-time) from radcheck where UserName='%{%k}'"
}
Thanks you anyway!
Edgars
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