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| 20. 32. 7. 回滚到保存点 |
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Savepoint;
import java.sql.Statement;
public class Main {
public static void main(String[] args) throws Exception {
Connection conn = getConnection();
conn.setAutoCommit(false);
Statement st = conn.createStatement();
st.executeUpdate("create table survey (id int,myURL CHAR);");
st.executeUpdate("insert into survey(id) values(01)");
st.executeUpdate("insert into survey(id) values(02)");
Savepoint mySavepoint = conn.setSavepoint("MYSAVEPOINT");
st.executeUpdate("insert into survey(id) values(03)");
conn.commit();
conn.rollback (mySavepoint);
st.close();
conn.close();
}
private static Connection getConnection() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
String url = "jdbc:hsqldb:mem:data/tutorial";
return DriverManager.getConnection(url, "sa", "");
}
}
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- Connection.releaseSavepoint() is used for removing a savepoint from a transaction.
- A rollback implicitly releases any savepoints that were defined after it.
- Once a transaction is committed or completely rolled back, all defined savepoints are released.
- Once a savepoint has been removed, any reference to it will cause a SQLException to be thrown.
- It is also possible to nest savepoints within transactions.
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