Question

是否可以进行批量更新但是有不同的声明？我找到的每个教程和在线资源都使用相同的语句。这就是我所拥有的，但它不起作用。

public static void resetNotifications(User user)
{
    DataSource dataSource = null;
    Context initialContext = null;
    Context environmentContext = null;
    Connection connection = null;
    PreparedStatement preparedStatement = null;
    String stride = "UPDATE stride SET recipientView = 1 WHERE recipientId = ?";
    String strideLike = "UPDATE strideLike SET recipientView = 1 WHERE recipientId = ? ";
    String strideCommentMe = "UPDATE strideComment SET recipientView = 1 WHERE recipientId = ? ";
    String strideCommentLike = "UPDATE strideCommentLike SET recipientView = 1 WHERE recipientId = ? ";
    String strideCommentFollow = "UPDATE strideCommentNotification SET recipientView = 1 WHERE userId = ? ";

    try
    {
        initialContext = new InitialContext();
        environmentContext = (Context) initialContext.lookup("java:/comp/env");
        dataSource = (DataSource) environmentContext.lookup("jdbc/instride");
        connection = dataSource.getConnection();
        connection.setAutoCommit(false);

        preparedStatement = connection.prepareStatement(stride);
        preparedStatement.setLong(1, user.getId());
        preparedStatement.addBatch();

        preparedStatement = connection.prepareStatement(strideLike);
        preparedStatement.setLong(1, user.getId());
        preparedStatement.addBatch();

        preparedStatement = connection.prepareStatement(strideCommentMe);
        preparedStatement.setLong(1, user.getId());
        preparedStatement.addBatch();

        preparedStatement = connection.prepareStatement(strideCommentLike);
        preparedStatement.setLong(1, user.getId());
        preparedStatement.addBatch();

        preparedStatement = connection.prepareStatement(strideCommentFollow);
        preparedStatement.setLong(1, user.getId());
        preparedStatement.addBatch();

        preparedStatement.executeBatch();
        connection.commit();
    }
    catch(NamingException error)
    {
        System.out.println("NotificationsDAO - resetNotifications() - Error With JNDI Lookup - " + error.getMessage());
        error.printStackTrace();
    }
    catch(SQLException error)
    {
        System.out.println("NotificationsDAO - resetNotifications() - Error With SQL - " + error.getMessage());
        error.printStackTrace();
    }
    finally
    {
        if (initialContext != null) try{initialContext.close();} catch(NamingException ignore) {}
        if (environmentContext != null) try{environmentContext.close();} catch(NamingException ignore) {}
        if (connection != null) try{connection.close();} catch(SQLException ignore) {}
        if (preparedStatement != null) try{preparedStatement.close();} catch(SQLException ignore) {}
    }
}

Answer 1

您不能在一个批处理中执行多个不同的语句，但是，您可以使用一个存储过程，可以在单个往返服务器中完成所有操作，同时保持单个事务的好处

Answer 2

如果您使用简单的Statement而不是PrepareStatement，则可以在一个批处理中执行多个不同的语句。请参阅文档和示例here。

准备好的声明，批量更新，不同的更新

2 个答案: