TeslaCN opened a new issue #13656:
URL: https://github.com/apache/shardingsphere/issues/13656
## Bug Report
### Which version of ShardingSphere did you use?
master - 3f7a17c572418de3664c9f6747564ffc0902490d
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere Proxy
### Expected behavior
Transaction operation succeed.
### Actual behavior
Changes cannot be rollbacked.
### Reason analyze (If you can)
The MySQL JDBC Driver using `set autocommit=0` instead of `begin` when
requires transaction, which makes the transaction status in ShardingSphere
Proxy incorrect.
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
```SQL
create table sbtest1
(
id int not null
primary key,
k int default 0 not null,
c char(120) default '' not null,
pad char(60) default '' not null
);
create index k_1
on sbtest1 (k);
```
```yaml
schemaName: sbtest_direct
dataSources:
ds_0:
url:
jdbc:mysql://127.0.0.1:3306/sbtest_direct?serverTimezone=UTC&useSSL=false&prepStmtCacheSize=8192
username: root
password: root
connectionTimeoutMilliseconds: 1000
idleTimeoutMilliseconds: 60000
maxLifetimeMilliseconds: 1800000
maxPoolSize: 192
minPoolSize: 0
rules:
- !READWRITE_SPLITTING
dataSources:
pr_ds:
writeDataSourceName: ds_0
readDataSourceNames: [ds_0]
```
### Example codes for reproduce this issue (such as a github link).
```java
public class MySQLProxyTransaction {
public static void main(String[] args) throws Exception {
int id = ThreadLocalRandom.current().nextInt(10000) + 1;
try (Connection connection = getConnection()) {
connection.setAutoCommit(false);
for (int i = 0; i < 2; i++) {
PreparedStatement ps1 = connection.prepareStatement("select
k from sbtest1 where id = ?");
PreparedStatement ps2 = connection.prepareStatement("update
sbtest1 set k = k + 1 where id = ?");
ps1.setInt(1, id);
ps2.setInt(1, id);
int previousK;
try (ResultSet resultSet = ps1.executeQuery()) {
resultSet.next();
previousK = resultSet.getInt(1);
}
ps2.executeUpdate();
try (ResultSet resultSet = ps1.executeQuery()) {
resultSet.next();
int currentK = resultSet.getInt(1);
if (currentK == previousK) {
throw new IllegalArgumentException();
}
}
connection.rollback();
try (ResultSet resultSet = ps1.executeQuery()) {
resultSet.next();
int currentK = resultSet.getInt(1);
if (currentK != previousK) {
throw new IllegalArgumentException();
}
}
}
}
}
@SneakyThrows
private static Connection getConnection() {
return
DriverManager.getConnection("jdbc:mysql://127.0.0.1:13306/sbtest_direct?useServerPrepStmts=true",
"root", "root");
}
}
```
Result:
```
Exception in thread "main" java.lang.IllegalArgumentException
at
icu.wwj.hello.jdbc.MySQLProxyTransaction.main(MySQLProxyTransaction.java:40)
```
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