SQL 修饰
Seata 的隔离级别默认为读未提交，该模式下本文表中的 select 语句的 SQL 修饰用法都是支持的；使用 for update 代理可以让 Seata 达到读已提交，该模式下 select 语句的用法只能部分支持。
DML 语句支持
| 类型 | SQL 实例 | 是否支持 |
| :----------- | :---------------------------------------------------- | :--------------------------------------------------------------------- | --- |
| AND & OR | UPDATE … WHERE col_name1=expr1 AND col_name2= expr2 | 是 |
| LIKE | UPDATE ... WHERE col_name1 LIKE 'NE' | 是 |
| 通配符 | UPDATE ... WHERE col_name1 LIKE 'NE%' | 是 |
| BETWEEN | UPDATE ... WHERE col_name1 BETWEEN expr1 AND expr2 | 是 |
| ON DUPLICATE | INSERT INTO tb1_name [(col_name,...)]VALUES (\{expr | DEFAULT},...),(...),...[ ON DUPLICATE KEY UPDATE col_name=expr, ... ] | 是 |
Select 语句支持
| 类型 | SQL 实例 | 读未提交 | 读已提交 |
| :----------------------------------------- | :--------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- | :------- | --- |
| AND & OR | SELECT * FROM tb1_name WHERE col_name1=expr1 AND col_name2= expr2 | 是 | 是 |
| ORDER BY | SELECT col_name1, col_name2 FROM tb1_name ORDER BY col_name1 | 是 | 是 |
| GROUP BY | SELECT col_name1, col_name2 FROM tb1_name GROUP BY col_name1 | 是 | 是 |
| LIKE | SELECT col_name1, col_name2 FROM tb1_name WHERE col_name1 LIKE 'NE' | 是 | 是 |
| 通配符 | SELECT col_name1, col_name2 FROM tb1_name WHERE col_name1 LIKE 'NE%' | 是 | 是 |
| EXISTS | SELECT col_name1, col_name2 FROM tb1_name WHERE EXISTS (expr1) | 是 | 是 |
| IN | SELECT col_name1, col_name2 FROM tb1_name WHERE col_name1 IN (expr1, expr2,...) | 是 | 是 |
| BETWEEN | SELECT col_name1, col_name2 FROM tb1_name WHERE col_name1 BETWEEN expr1 AND expr2 | 是 | 是 |
| ON DUPLICATE | INSERT INTO tb1_name [(col_name,...)]VALUES ({expr \ | DEFAULT},...),(...),...[ ON DUPLICATE KEY UPDATE col_name=expr, ... ] | 是 | 是 |
| ALIASES | SELECT t1. col_name1, t2.col_name2 FROM tb1_name AS t1, tb2_name AS t2 WHERE t1. col_name=expr AND t2. col_name=expr | 是 | 是 |
| TOP | SELECT TOP 2 * FROM tb1_name | 是 | 是 |
| LIMIT | SELECT col_name1, col_name2 FROM tb1_name LIMIT 5 | 是 | 是 |
| JOININNER JOINLEFT JOINRIGHT JOINFULL JOIN | SELECT col_name1, col_name2 FROM tb1_name JOIN tb2_name ON tb1_name. col_name1= tb2_name. col_name1 | 是 | 否 |
| UNIONUNION ALLSELECT INTO | SELECT col_name1, col_name2 FROM tb1_name UNION SELECT col_name1, col_name2 FROM tb2_name | 是 | 否 |