kimmking commented on issue #7566:
URL: https://github.com/apache/shardingsphere/issues/7566#issuecomment-696698724
`isValid` has been supported in master branch now:
```
@Override
public final boolean isValid(final int timeout) throws SQLException {
for (Connection connection : cachedConnections.values()) {
if (!connection.isValid(timeout)) {
return false;
}
}
return true;
}
```
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