Patch for dbforbix support db2

[jackknight]

Hi all：
The dbforbix support db2 now.

https://github.com/cheliequan/dbforbix

Mode: Differences
Left file: C:\Users\Administrator\Desktop\dbforbix-src-0.6.1\com\smartmarmot\common\Constants.java
Right file: C:\Users\Administrator\Desktop\dbforbix-src-0.6.1 - 副本\com\smartmarmot\common\Constants.java
public static final String DB2_VALIDATION_QUERY = "SELECT 1 FROM DUAL"; <> public static final String DB2_VALIDATION_QUERY = "SELECT 1";
public static final String DB2_WHOAMI_QUERY = "SELECT CURRENT USER FROM SYSIBM.SYSDUMMY1"; public static final String DB2_WHOAMI_QUERY = "SELECT SYSTEM_USER";
public static final String DB2_DBNAME_QUERY = "SELECT CURRENT SERVER FROM SYSIBM.SYSDUMMY1"; public static final String DB2_DBNAME_QUERY = "SELECT @@SERVERNAME";