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public boolean user_valid()
{
this.strSql="select UserID,UserName from `users` ";
this.strSql=this.strSql + " where UserName='" + this.UserName + "'";
this.strSql=this.strSql + " and UserPassword='"+ this.UserPassword + "'";  

try
{
ResultSet rs = super.exeSqlQuery(this.strSql); 
if (rs.next())
{
this.UserID=rs.getLong("UserID");
this.UserName=rs.getString("UserName");
return true;
}
else
{  
return false;
}
}
catch(Exception ex)
{  
return false;
}  
}
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