导出mongodb 数据。
#mongoexport -u admin -p='ooxx' --authenticationDatabase admin -d res -c reseinfo -f _id,resid,atid,atinfo,baseinfo --limit 10000 -o /tmp/1.json
（_id,resid,atid,atinfo,baseinfo为指定的字段）
安装mysql shell
rpm –ivh mysql-shell-8.0.24-1.el7.x86_64.rpm
安装x插件(mysql8.0默认已安装)
#mysqlsh -u user -h localhost --classic --dba enableXProtocol
或者
mysql> INSTALL PLUGIN mysqlx SONAME 'mysqlx.so';
启动mysql shell 建立 X 会话
#mysqlsh root@localhost:33060
MySQL localhost:33060+ ssl test SQL >\py
MySQL localhost:33060+ ssl test py >util.import_json("/tmp/1.json",{"schema": "test", "table": "tjson1","convertBsonOid": True})
即导入成功。33060是X 插件的侦听端口
扩展测试：通过虚拟列来优化mysql json数据类型的字段的检索
添加虚拟列
mysql>alter table tjson1 add atid bigint generated always as (doc->'$.atid');
查看表结构
mysql>desc tjson1;
+-----------+------------+------+-----+---------+-------------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+------------+------+-----+---------+-------------------+
| doc | json | YES | | NULL | |
| id | int(11) | NO | PRI | NULL | auto_increment |
| atid | bigint(20) | YES | | NULL | VIRTUAL GENERATED |
+-----------+------------+------+-----+---------+-------------------+
给虚拟列添加索引
mysql>alter table tjson1 add index idx_atid(atid);
直接在json列中检索数据
mysql>explain SELECT * FROM tjson1 WHERE JSON_EXTRACT(doc,'$.atid')='155745128';
+----+-------------+--------+------------+------+---------------+------+---------+------+--------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+--------+------------+------+---------------+------+---------+------+--------+----------+-------------+
| 1 | SIMPLE | tjson1 | NULL | ALL | NULL | NULL | NULL | NULL | 241834 | 100.00 | Using where |
+----+-------------+--------+------------+------+---------------+------+---------+------+--------+----------+-------------+
通过虚拟列检索数据
> explain SELECT * FROM tjson1 WHERE atid=155745460;
+----+-------------+--------+------------+------+---------------+---------------+---------+-------+------+----------+-------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+--------+------------+------+---------------+---------------+---------+-------+------+----------+-------+
| 1 | SIMPLE | tjson1 | NULL | ref | idx_atid | idx_atid | 9 | const | 2 | 100.00 | NULL |
+----+-------------+--------+------------+------+---------------+---------------+---------+-------+------+----------+-------+
两者的执行计划差异明显