Java 为什么即使我没有'；你不承诺吗？

我有一个方法来检查commit是如何工作的。我试图设置错误的值来获取异常并在它抛出时进行检查。我原以为它会在提交之后出现，但当我使用

executeUpdate

方法时，它会抛出。这个方法应该是这样工作的吗

public void check(){
    String query = "Insert into user_info(login,userPassword,userType,userEmail)values(?,?,?,?);";
    Connection connection = null;
    PreparedStatement statement = null;
    try{
        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/taksi_online","Bruce","givanchy");
        connection.setAutoCommit(false);
        statement = connection.prepareStatement(query);
        statement.setString(1,"asdasqqqqqqq");
        statement.setString(2,"sff");
        statement.setString(3,"client");
        statement.setString(4,"qweq");
        System.out.println(statement.executeUpdate());
    } catch (SQLException e) {
        System.out.println("Error message "+e.getMessage());
        System.out.println("Error code "+e.getErrorCode());
        System.out.println("Sql state is "+e.getSQLState());
        // I get error at this place
    }finally {
        try {
            statement.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
    System.out.println("after");
    try {
        //but I thought I should get it here after commit
        connection.commit();
    } catch (SQLException throwables) {
        throwables.printStackTrace();
        try {
            connection.rollback();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }finally {
        try {
            connection.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}

这个方法应该是这样工作的吗

public void check(){
    String query = "Insert into user_info(login,userPassword,userType,userEmail)values(?,?,?,?);";
    Connection connection = null;
    PreparedStatement statement = null;
    try{
        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/taksi_online","Bruce","givanchy");
        connection.setAutoCommit(false);
        statement = connection.prepareStatement(query);
        statement.setString(1,"asdasqqqqqqq");
        statement.setString(2,"sff");
        statement.setString(3,"client");
        statement.setString(4,"qweq");
        System.out.println(statement.executeUpdate());
    } catch (SQLException e) {
        System.out.println("Error message "+e.getMessage());
        System.out.println("Error code "+e.getErrorCode());
        System.out.println("Sql state is "+e.getSQLState());
        // I get error at this place
    }finally {
        try {
            statement.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
    System.out.println("after");
    try {
        //but I thought I should get it here after commit
        connection.commit();
    } catch (SQLException throwables) {
        throwables.printStackTrace();
        try {
            connection.rollback();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }finally {
        try {
            connection.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}

对。您没有提交更改并不意味着您可以执行无效的更改

事务发生在数据库上，而不是在应用程序中。因此，您执行的任何操作都必须是对其中数据的有效数据库操作。事务所做的（显然过于简化）是将其全部封装在一组原子操作中。但每个操作仍然需要有效

抛出异常允许开发人员捕获异常并回滚整个事务。这就是关键所在