1. OceanBase介紹
OceanBase是螞蟻金服研發的數據庫，有Oracle和Mysql兩種模式。
2.Oracle模式的遍歷
遍歷表：
select TABLE_NAME,NUM_ROWS from user_tables;
遍歷列：
select COLUMN_NAME, DATA_TYPE, DATA_LENGTH, NULLABLE
from user_tab_columns where table_name = 'TEST1';
3.Mysql模式的遍歷
OB Mysql
1. 遍歷數據庫的表
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. 獲取數據表的列名稱和類型
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. 讀數據表中數據
直接用 sql 查表