Rollback to savepoint : Transation « Database « Java Tutorial

1. Java Tutorial
2. Database
3. Transation

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", "");
  }
}

1. Connection.releaseSavepoint() is used for removing a savepoint from a transaction.
2. A rollback implicitly releases any savepoints that were defined after it.
3. Once a transaction is committed or completely rolled back, all defined savepoints are released.
4. Once a savepoint has been removed, any reference to it will cause a SQLException to be thrown.
5. It is also possible to nest savepoints within transactions.