Question

json字符串转换成对象，怎么判断某个字段为空

Answer 1

PreparedStatement ps = null;
String sql = "";
try {
if(groupObj.getGroupAddress()!=null || groupObj.getGroupAddress().trim().length()!=0){

sql = "update t_group set groupAddress = ? where groupKey = ?";
ps = conn.prepareStatement(sql);
ps.setString(1, groupObj.getGroupAddress());
ps.setString(2, groupObj.getGroupKey());
ps.executeUpdate();
}