在 Amazon Keyspaces 表中插入和加载数据

1. 打开 AWS CloudShell 然后使用以下命令连接到 Amazon Keyspaces。请务必更新 us-east-1 使用您自己的区域。

   cqlsh-expansion cassandra.us-east-1.amazonaws.com 9142 --ssl

   该命令应生成如下所示的输出。

   Connected to Amazon Keyspaces at cassandra.us-east-1.amazonaws.com:9142
   [cqlsh 6.1.0 | Cassandra 3.11.2 | CQL spec 3.4.4 | Native protocol v4]
   Use HELP for help.
   cqlsh current consistency level is ONE.

2. 在使用 cqlsh 将数据写入 Amazon Keyspaces 表之前，您必须将当前 cqlsh 会话的写入一致性设置为 LOCAL_QUORUM。有关支持的一致性级别的更多信息，请参阅写入一致性级别。请注意，如果您在中使用CQL编辑器，则不需要执行此步骤 AWS Management Console.

   CONSISTENCY LOCAL_QUORUM;

3. 要插入单条记录，请在CQL编辑器中运行以下命令。

   INSERT INTO catalog.book_awards (award, year, category, rank, author, book_title, publisher)
   VALUES ('Wolf', 2023, 'Fiction',3,'Shirley Rodriguez','Mountain', 'AnyPublisher') ;

4. 通过运行以下命令，验证数据是否已正确添加到表中。

   SELECT * FROM catalog.book_awards ;

   语句的输出应如下所示。

    year | award | category | rank | author            | book_title | publisher
   ------+-------+----------+------+-------------------+------------+--------------
    2023 |  Wolf |  Fiction |    3 | Shirley Rodriguez |   Mountain | AnyPublisher
   
   (1 rows)

使用 cqlsh 从文件插入多个记录

1. 下载存档CSV文件 samplemigration.zip 中包含的示例文件 (keyspaces_sample_table.csv)。解压缩存档文件并记下指向 keyspaces_sample_table.csv 的路径。

   

2. 打开 AWS CloudShell 在 AWS Management Console 然后使用以下命令连接到 Amazon Keyspaces。请务必更新 us-east-1 使用您自己的区域。

   cqlsh-expansion cassandra.us-east-1.amazonaws.com 9142 --ssl

3. 在 cqlsh 提示符 (cqlsh>) 处，指定键空间。

   USE catalog ;

4. 将写入一致性设置为 LOCAL_QUORUM。有关支持的一致性级别的更多信息，请参阅写入一致性级别。

   CONSISTENCY LOCAL_QUORUM;

5. 在 AWS CloudShell 选择屏幕右上角的操作，然后选择上传文件上传之前下载的 csv 文件。记下文件的路径。

6. 在 keyspace 提示符 (cqlsh:catalog>) 处，运行以下语句。

   COPY book_awards (award, year, category, rank, author, book_title, publisher) FROM '/home/cloudshell-user/keyspaces_sample_table.csv' WITH header=TRUE ;

   该语句的输出应类似于此。

   cqlsh:catalog> COPY book_awards (award, year, category, rank, author, book_title, publisher)                      FROM '/home/cloudshell-user/keyspaces_sample_table.csv' WITH delimiter=',' AND header=TRUE ;
   cqlsh current consistency level is LOCAL_QUORUM.
   Reading options from /home/cloudshell-user/.cassandra/cqlshrc:[copy]: {'numprocesses': '16', 'maxattempts': '1000'}
   Reading options from /home/cloudshell-user/.cassandra/cqlshrc:[copy-from]: {'ingestrate': '1500', 'maxparseerrors': '1000', 'maxinserterrors': '-1', 'maxbatchsize': '10', 'minbatchsize': '1', 'chunksize': '30'}
   Reading options from the command line: {'delimiter': ',', 'header': 'TRUE'}
   Using 16 child processes
   
   Starting copy of catalog.book_awards with columns [award, year, category, rank, author, book_title, publisher].
   OSError: handle is closed      0 rows/s; Avg. rate:       0 rows/s
   Processed: 9 rows; Rate:       0 rows/s; Avg. rate:       0 rows/s
   9 rows imported from 1 files in 0 day, 0 hour, 0 minute, and 26.706 seconds (0 skipped).

7. 通过运行以下查询，验证数据是否已正确添加到表中。

   SELECT * FROM book_awards ;

   您应当看到如下输出。

    year | award            | category    | rank | author             | book_title            | publisher
   ------+------------------+-------------+------+--------------------+-----------------------+---------------
    2020 |             Wolf | Non-Fiction |    1 |        Wang Xiulan |      History of Ideas | Example Books
    2020 |             Wolf | Non-Fiction |    2 | Ana Carolina Silva |         Science Today | SomePublisher
    2020 |             Wolf | Non-Fiction |    3 |  Shirley Rodriguez | The Future of Sea Ice |  AnyPublisher
    2020 | Kwesi Manu Prize |     Fiction |    1 |         Akua Mansa |     Where did you go? | SomePublisher
    2020 | Kwesi Manu Prize |     Fiction |    2 |        John Stiles |             Yesterday | Example Books
    2020 | Kwesi Manu Prize |     Fiction |    3 |         Nikki Wolf | Moving to the Chateau |  AnyPublisher
    2020 |      Richard Roe |     Fiction |    1 |  Alejandro Rosalez |           Long Summer | SomePublisher
    2020 |      Richard Roe |     Fiction |    2 |        Arnav Desai |               The Key | Example Books
    2020 |      Richard Roe |     Fiction |    3 |      Mateo Jackson |      Inside the Whale |  AnyPublisher
   
   (9 rows)