MAKE IT SO: Java DB Connections & Transactions

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Multiple Users And Deadlocks - Updates

If you followed the two previous sections, you might be thinking that updates are not really that different from inserts. No problem if there are no constraints on the table, problem if there are constraints.

Well, let’s find out. We are inserting a record and another connection is executing an update that would affect the row we just added but have not yet committed.

Create This .java File And Run It

package part_01_jdbc.code;

import org.junit.Before;
import org.junit.Test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

 * @author Marco Behler
public class DeadlocksUpdateExercise {

    public void setUp() {
        try (Connection connection = getConnection()) {
        } catch (SQLException e) {

    public void deadlock_update_exercise() throws SQLException {
        System.out.println("Do we reach the end of the test without a " +
        try (Connection connectionFromJackBauer = getConnection()) {
            connectionFromJackBauer.createStatement().execute("" +
                    "insert into items " +
                    "(name) values ('CTU Field Agent Report')");
            try (Connection connectionFromHabibMarwan = getConnection()) {
                        "update items set name = 'destroyed' " +
                                "where name = 'CTU Field Agent Report'");
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Console Output After Running The Test
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