Oracle 异常工作中出现的

① ORA-00936 缺失表达式

实例--错误的情况

        /// <summary>
        /// 获取城市信息结果集
        /// </summary>
        /// <returns></returns>
        public DataSet GetCityDS(CityModel cityModel)
        {
            string sql = @"select t1.CITY_ID,
 8                                   t1.CITY_NAME,
 9                                   t1.PRO_ID,(select t2.PRO_NAME from T_BASE_PROVINCE t2 where t2.PRO_ID = t1.PRO_ID) PRO_NAME
                           from T_BASE_CITY t1
                           where 1 = 1
                        ";
            if ((!"".Equals(cityModel.CITY_ID)) && (cityModel.CITY_ID != null))
            {
                sql += " and t1.CITY_ID like '%" + cityModel.CITY_ID + "%'";
            }
            if ((!"".Equals(cityModel.CITY_ID_NEW)) && (cityModel.CITY_ID_NEW != null))
            {
                sql += " and t1.CITY_ID like '%" + cityModel.CITY_ID_NEW + "%'";
            }
            if ((!"".Equals(cityModel.CITY_NAME)) && (cityModel.CITY_NAME != null))
            {
                sql += " and t1.CITY_NAME like '%" + cityModel.CITY_NAME + "%'";
            }
            return OracleHelper.ExecuteDataset(CommandType.Text,sql);
        }

把编译的sql放到Developer 没问题能正确查出数据，但是报ORA-00936 缺失表达式，下面是正确的代码

实例--正确的实例

        /// <summary>
        /// 获取城市信息结果集
        /// </summary>
        /// <returns></returns>
        public DataSet GetCityDS(CityModel cityModel)
        {
            string sql = @"select t1.CITY_ID,t1.CITY_NAME,t1.PRO_ID,(select t2.PRO_NAME from T_BASE_PROVINCE t2 where t2.PRO_ID = t1.PRO_ID) PRO_NAME
                           from T_BASE_CITY t1
                           where 1 = 1
                        ";
            if ((!"".Equals(cityModel.CITY_ID)) && (cityModel.CITY_ID != null))
            {
                sql += " and t1.CITY_ID like '%" + cityModel.CITY_ID + "%'";
            }
            if ((!"".Equals(cityModel.CITY_ID_NEW)) && (cityModel.CITY_ID_NEW != null))
            {
                sql += " and t1.CITY_ID like '%" + cityModel.CITY_ID_NEW + "%'";
            }
            if ((!"".Equals(cityModel.CITY_NAME)) && (cityModel.CITY_NAME != null))
            {
                sql += " and t1.CITY_NAME like '%" + cityModel.CITY_NAME + "%'";
            }
            return OracleHelper.ExecuteDataset(CommandType.Text,sql);
        }

总结：竖着写有可能出错，可能有中文之类的空格符，建议先紧紧横着写，然后再转换成竖写的形式。