將數據插入並將其加載到 Amazon Keyspaces 表中

1. 開啟 AWS CloudShell 並使用以下命令連接到 Amazon Keyspaces。確保更新 us-east-1 與您自己的區域。

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

   該命令的輸出應該是這樣的。

   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. 您必須先將目前 cqlsh 工作階段的寫入一致性設定為，才能使用 cqlsh 將資料寫入 Amazon Keyspaces 資料表。LOCAL_QUORUM如需有關支援一致性層級的詳細資訊，請參閱寫入一致性層級。請注意，如果您使用中的CQL編輯器，則不需要執行此步驟 AWS Management Console.

   CONSISTENCY LOCAL_QUORUM;

3. 若要插入單一記錄，請在CQL編輯器中執行下列命令。

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

4. 執行下列命令，確認資料已正確新增至資料表。

   SELECT * FROM catalog.book_awards ;

   陳述式的輸出應該是這樣的。

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

若要使用 cqlsh 從檔案插入多筆記錄

1. 下載封存CSV檔案 samplemigration.zip 中包含的範例檔案 (keyspaces_sample_table.csv)。解壓縮封存並記下的路徑。keyspaces_sample_table.csv

   

2. 開啟 AWS CloudShell 在 AWS Management Console 並使用以下命令連接到 Amazon Keyspaces。確保更新 us-east-1 與您自己的區域。

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

3. 在cqlsh提示符（cqlsh>）下，指定密鑰空間。

   USE catalog ;

4. 將寫入一致性設定為LOCAL_QUORUM。如需有關支援一致性層級的詳細資訊，請參閱寫入一致性層級。

   CONSISTENCY LOCAL_QUORUM;

5. 在 AWS CloudShell 選擇屏幕右上角的「操作」，然後選擇「上傳文件」以上傳之前下載的 csv 文件。記下檔案的路徑。

6. 在密鑰空間提示符（cqlsh:catalog>），運行下面的語句。

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

   陳述式的輸出看起來應該類似於這個。

   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. 執行下列查詢，確認資料已正確新增至資料表。

   SELECT * FROM book_awards ;

   您應該會看到下列輸出。

    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)