SHELL脚本导入导出数据时，按逗号分隔，引号包含字段，null值''
gccli -uroot -h$ip -e"rmt:${sqlStr} into outfile '${name}${datetimes}.txt' fields terminated by ',' enclosed by '\"' null_value '';"
FIELDS TERMINATED BY ',' 字段间分割符
OPTIONALLY ENCLOSED BY '"' 将字段包围 对数值型无效
LINES TERMINATED BY '\n' 换行符
