clob,nclob当值为“”空字符串时，就会出现这个错误

 

OracleParameter op = new OracleParameter("CONTENTclog", OracleType.Clob);            if (model.CONTENT == ""||model.CONTENT==null)            {                op.Value = " ";            }            else            {                op.Value = model.CONTENT;                           }            OracleParameter[] o = { op };