1. OceanBase介绍
OceanBase是蚂蚁金服研发的数据库，有Oracle和Mysql两种模式。
2.Oracle模式的遍历
遍历表：
select TABLE_NAME,NUM_ROWS from user_tables;
遍历列：
select COLUMN_NAME, DATA_TYPE, DATA_LENGTH, NULLABLE
from user_tab_columns where table_name = 'TEST1';
3.Mysql模式的遍历
OB Mysql
1. 遍历数据库的表
show tables from $database
MySQL [test_db]> show tables from test_db;
+-------------------+
| Tables_in_test_db |
+-------------------+
| t1 |
+-------------------+
1 row in set (0.01 sec)
2. 获取数据表的列名称和类型
show columns from $database.$table
MySQL [test_db]> show columns from test_db.t1;
+-------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| c1 | int(11) | NO | PRI | NULL | |
| c2 | varchar(256) | YES | | NULL | |
+-------+--------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
3. 读数据表中数据
直接用 sql 查表