Le voilà :D
Code:
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6 PreparedStatement pst_ci=conn.prepareStatement("INSERT INTO tout(VLAN,client) " + "SELECT DISTINCT '"+srv.getvlan()+"','"+DoubleGuillemets(convertNullToEmptyString(srv.getdesc()))+"' FROM dual WHERE NOT EXISTS " +" (SELECT VLAN,client FROM tout WHERE VLAN = '"+srv.getvlan()+"')"); pst_ci.executeUpdate();