FlyingZC commented on PR #21992:
URL: https://github.com/apache/shardingsphere/pull/21992#issuecomment-1325885575
```java
Connection connection = getConnection();
String query = "select * from t_order;";
ResultSet resultSet = connection.createStatement().executeQuery(query);
while (resultSet.next()) {
// null value
String status = resultSet.getString(3);
// will be true
boolean wasNull = resultSet.wasNull();
if (wasNull) {
System.out.print("status: " + status);
}
}
```
By my test in mysql JDBC, when `resultSet.getXxx()` return null,
`resultSet.wasNull()` will be true.It's the same with your change.But maybe we
should check the usage of these methods,because the logic has changed.
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