Use entity.Save() and entity.InsertToDB() to save new record

Hi all,

    I try to use class Entity to save data, here is my code:

DsslmContractActivityLogData logData = new DsslmContractActivityLogData(UserConnection);

                logData.DsslmLogId = logId;

                logData.DsslmSchemaPrimaryKeyValue = item.SchemaPrimaryKey;

                logData.DsslmSchemaName = item.SchemaName;

                logData.DsslmSchemaJsonData = item.JsonData;

                if (!logData.InsertToDB())

                {

                    this.Logger.Info("Create log failed");

                }

The result is always false without any error message. What happen?