{"id":47144,"date":"2023-01-30T07:03:50","date_gmt":"2023-09-22T08:32:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%9c%a8ksqldb%e4%b8%ad%e5%b0%9d%e8%af%95%e4%ba%86%e5%ae%a2%e6%88%b7%e5%bf%a0%e8%af%9a%e5%ba%a6%e8%ae%a1%e5%88%92%e3%80%82\/"},"modified":"2024-04-29T12:12:15","modified_gmt":"2024-04-29T04:12:15","slug":"%e6%88%91%e5%9c%a8ksqldb%e4%b8%ad%e5%b0%9d%e8%af%95%e4%ba%86%e5%ae%a2%e6%88%b7%e5%bf%a0%e8%af%9a%e5%ba%a6%e8%ae%a1%e5%88%92%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%9c%a8ksqldb%e4%b8%ad%e5%b0%9d%e8%af%95%e4%ba%86%e5%ae%a2%e6%88%b7%e5%bf%a0%e8%af%9a%e5%ba%a6%e8%ae%a1%e5%88%92%e3%80%82\/","title":{"rendered":"\u6211\u5728ksqlDB\u4e2d\u5c1d\u8bd5\u4e86\u5ba2\u6237\u5fe0\u8bda\u5ea6\u8ba1\u5212"},"content":{"rendered":"

\u6458\u8981<\/h3>\n

\u9019\u6b21\uff0c\u6211\u5011\u9078\u64c7\u5ba2\u6236\u5fe0\u8aa0\u5ea6\u4f5c\u70ba\u4f7f\u7528\u6848\u4f8b\uff0c\u4e26\u5617\u8a66\u4f7f\u7528 ksqlDB \u53bb\u7de8\u5beb\u7a0b\u5e8f\u3002<\/p>\n

\u8003\u8651\u5ba2\u6237\u5fe0\u8bda\u5ea6\u8ba1\u5212<\/h3>\n

\u201c\u5728\u8bb8\u591a\u5730\u65b9\u6211\u4eec\u90fd\u80fd\u770b\u5230:\u300c\u96c6\u9f5010\u679a\u5370\u7ae0\u5c31\u80fd\u514d\u8d39\u4eab\u7528\u4e00\u676f\u5496\u5561\u300d\u8fd9\u79cd\u7b80\u5355\u7684\u6d3b\u52a8\u3002\u8fd9\u4e9b\u88ab\u79f0\u4e3a\u987e\u5ba2\u5fe0\u8bda\u5ea6\u8ba1\u5212\u3002
\n\u8fd9\u4e00\u6b21\uff0c\u6211\u4eec\u5c06\u8fdb\u4e00\u6b65\u6f14\u53d8\u8fd9\u6837\u7684\u8ba1\u5212\uff0c\u4ee5\u521b\u5efa\u4e00\u4e2a\u66f4\u52a0\u7cbe\u81f4\u7684\u5956\u52b1\u8ba1\u5212\uff0c\u5438\u5f15\u5ba2\u6237\u5728\u9002\u5f53\u7684\u5730\u70b9\u548c\u65f6\u95f4\u3002
\n\u4e3a\u6b64\uff0c\u6211\u4eec\u9700\u8981\u6574\u5408\u591a\u4e2a\u6570\u636e\u6d41\uff0c\u4ee5\u5728\u9002\u5f53\u7684\u65f6\u673a\u5e94\u7528\u9002\u5f53\u7684\u4fc3\u9500\u6d3b\u52a8\u3002\u201d<\/p>\n

\u4f7f\u7528ksqlDB<\/h3>\n

ksqlDB\u53ef\u4ee5\u76f4\u63a5\u4ece\u4e91\u7aef\u5e38\u89c1\u7684\u6570\u636e\u6e90\u548c\u7ec8\u7aef\u7cfb\u7edf\u4e2d\u5bfc\u5165\u548c\u5bfc\u51fa\u6570\u636e\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u4f7f\u7528ksqlDB\u7684INSERT INTO\u529f\u80fd\u6765\u8fd0\u884c\u5305\u542b\u6a21\u62df\u6570\u636e\u7684\u4ee3\u7801\u3002
\n\u672c\u6587\u65e8\u5728\u63a2\u8ba8\u5404\u79cd\u65b9\u6cd5\uff0c\u5206\u6790\u7528\u6237\u884c\u4e3a\u5e76\u51b3\u5b9a\u4e3a\u5ba2\u6237\u63d0\u4f9b\u6fc0\u52b1\u65b9\u6848\u7684\u65b9\u5f0f\u3002<\/p>\n

\u6b65\u9aa41\uff1a\u521b\u5efa\u6d41\u3002<\/h3>\n

\u6211\u4eec\u5c06\u6267\u884c\u4ee5\u4e0b ksqlDB \u8bed\u6cd5\u3002
\n\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u521b\u5efa\u4e09\u4e2a STREAM\uff0c\u5206\u522b\u4e3a users\u3001products \u548c purchases\u3002<\/p>\n

CREATE STREAM users<\/span> (<\/span>\r\n\u00a0 user_id VARCHAR KEY,\r\n\u00a0 name VARCHAR\r\n)<\/span> WITH (<\/span>\r\n\u00a0 KAFKA_TOPIC =<\/span> 'USERS'<\/span>,\r\n\u00a0 VALUE_FORMAT =<\/span> 'JSON'<\/span>,\r\n\u00a0 PARTITIONS =<\/span> 6\r\n)<\/span>;<\/span>\r\n\r\nCREATE STREAM products (<\/span>\r\n\u00a0 product_id VARCHAR KEY,\r\n\u00a0 category VARCHAR,\r\n\u00a0 price DECIMAL(<\/span>10,2)<\/span>\r\n)<\/span> WITH (<\/span>\r\n\u00a0 KAFKA_TOPIC =<\/span> 'products'<\/span>,\r\n\u00a0 VALUE_FORMAT =<\/span> 'JSON'<\/span>,\r\n\u00a0 PARTITIONS =<\/span> 6\r\n)<\/span>;<\/span>\r\n\r\nCREATE STREAM purchases (<\/span>\r\n\u00a0 user_id VARCHAR KEY,\r\n\u00a0 product_id VARCHAR\r\n)<\/span> WITH (<\/span>\r\n\u00a0 KAFKA_TOPIC =<\/span> 'purchases'<\/span>,\r\n\u00a0 VALUE_FORMAT =<\/span> 'JSON'<\/span>,\r\n\u00a0 PARTITIONS =<\/span> 6\r\n)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efa\u7269\u5316\u89c6\u56fe\u7684\u6b65\u9aa42\uff1a<\/h3>\n
CREATE TABLE all_products AS\r\n\u00a0 SELECT\r\n\u00a0 \u00a0 product_id,\r\n\u00a0 \u00a0 LATEST_BY_OFFSET(<\/span>category)<\/span> AS category,\r\n\u00a0 \u00a0 LATEST_BY_OFFSET(<\/span>CAST(<\/span>price AS DOUBLE))<\/span> AS price\r\n\u00a0 FROM products\r\n\u00a0 GROUP BY product_id;<\/span>\r\n\r\nCREATE STREAM enriched_purchases AS\r\n\u00a0 SELECT\r\n\u00a0 \u00a0 purchases.user_id,\r\n\u00a0 \u00a0 purchases.product_id AS product_id,\r\n\u00a0 \u00a0 all_products.category,\r\n\u00a0 \u00a0 all_products.price\r\n\u00a0 FROM purchases\r\n\u00a0 \u00a0 LEFT JOIN all_products ON purchases.product_id =<\/span> all_products.product_id;<\/span>\r\n\r\nCREATE TABLE sales_totals AS\r\n\u00a0 SELECT\r\n\u00a0 \u00a0 user_id,\r\n\u00a0 \u00a0 SUM(<\/span>price)<\/span> AS total,\r\n\u00a0 \u00a0 CASE\r\n\u00a0 \u00a0 \u00a0 WHEN SUM(<\/span>price)<\/span> ><\/span> 400 THEN 'GOLD'<\/span>\r\n\u00a0 \u00a0 \u00a0 WHEN SUM(<\/span>price)<\/span> ><\/span> 300 THEN 'SILVER'<\/span>\r\n\u00a0 \u00a0 \u00a0 WHEN SUM(<\/span>price)<\/span> ><\/span> 200 THEN 'BRONZE'<\/span>\r\n\u00a0 \u00a0 \u00a0 ELSE 'CLIMBING'<\/span>\r\n\u00a0 \u00a0 END AS reward_level\r\n\u00a0 FROM enriched_purchases\r\n\u00a0 GROUP BY user_id;<\/span>\r\n\r\nCREATE TABLE caffeine_index AS\r\n\u00a0 SELECT\r\n\u00a0 \u00a0 user_id,\r\n\u00a0 \u00a0 COUNT(<\/span>*<\/span>)<\/span> AS total,\r\n\u00a0 \u00a0 (<\/span>COUNT(<\/span>*<\/span>)<\/span> % 6)<\/span> AS sequence,\r\n\u00a0 \u00a0 (<\/span>COUNT(<\/span>*<\/span>)<\/span> % 6)<\/span> =<\/span> 5 AS next_one_free\r\n\u00a0 FROM purchases\r\n\u00a0 WHERE product_id =<\/span> 'coffee'<\/span>\r\n\u00a0 GROUP BY user_id;<\/span>\r\n\r\nCREATE TABLE promotion_french_poodle\r\n\u00a0 AS\r\n\u00a0 SELECT\r\n\u00a0 \u00a0 \u00a0 user_id,\r\n\u00a0 \u00a0 \u00a0 collect_set(<\/span>product_id)<\/span> AS products,\r\n\u00a0 \u00a0 \u00a0 'french_poodle'<\/span> AS promotion_name\r\n\u00a0 FROM purchases\r\n\u00a0 WHERE product_id IN (<\/span>'dog'<\/span>, 'beret'<\/span>)<\/span>\r\n\u00a0 GROUP BY user_id\r\n\u00a0 HAVING ARRAY_CONTAINS(<\/span> collect_set(<\/span>product_id)<\/span>, 'dog'<\/span> )<\/span>\r\n\u00a0 AND ARRAY_CONTAINS(<\/span> collect_set(<\/span>product_id)<\/span>, 'beret'<\/span> )<\/span>\r\n\u00a0 EMIT changes;<\/span>\r\n\r\nCREATE TABLE promotion_loose_leaf AS\r\n\u00a0 SELECT\r\n\u00a0 \u00a0 \u00a0 user_id,\r\n\u00a0 \u00a0 \u00a0 collect_set(<\/span>product_id)<\/span> AS products,\r\n\u00a0 \u00a0 \u00a0 'loose_leaf'<\/span> AS promotion_name\r\n\u00a0 FROM enriched_purchases\r\n\u00a0 WHERE product_id IN (<\/span>'coffee'<\/span>, 'tea'<\/span>)<\/span>\r\n\u00a0 GROUP BY user_id\r\n\u00a0 HAVING ARRAY_CONTAINS(<\/span> collect_set(<\/span>product_id)<\/span>, 'coffee'<\/span> )<\/span>\r\n\u00a0 AND NOT ARRAY_CONTAINS(<\/span> collect_set(<\/span>product_id)<\/span>, 'tea'<\/span> )<\/span>\r\n\u00a0 AND sum<\/span>(<\/span>price)<\/span> ><\/span> 20;<\/span>\r\n<\/code><\/pre>\n
\u7b2c\u4e09\u6b65\uff1a\u63d2\u5165\u6a21\u62df\u6570\u636e\u3002<\/h3>\n
\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u4f7f\u7528 ksqlDB \u63d2\u5165\u6a21\u62df\u6570\u636e\u3002
\n\u6211\u4eec\u5c06\u7ed9\u7528\u6237\u3001\u4ea7\u54c1\u548c\u8d2d\u4e70\u6570\u636e\u5206\u522b\u8bbe\u7f6e\u6a21\u62df\u6570\u636e\u3002<\/p>\n
--<\/span> Some users.\r\nINSERT INTO users<\/span> (<\/span> user_id, name )<\/span> VALUES (<\/span> 'u2001'<\/span>, 'kris'<\/span> )<\/span>;<\/span>\r\nINSERT INTO users<\/span> (<\/span> user_id, name )<\/span> VALUES (<\/span> 'u2002'<\/span>, 'dave'<\/span> )<\/span>;<\/span>\r\nINSERT INTO users<\/span> (<\/span> user_id, name )<\/span> VALUES (<\/span> 'u2003'<\/span>, 'yeva'<\/span> )<\/span>;<\/span>\r\nINSERT INTO users<\/span> (<\/span> user_id, name )<\/span> VALUES (<\/span> 'u2004'<\/span>, 'rick'<\/span> )<\/span>;<\/span>\r\n--<\/span> Some products.\r\nINSERT INTO products (<\/span> product_id, category, price )<\/span> VALUES (<\/span> 'tea'<\/span>, 'beverages'<\/span>, 2.55 )<\/span>;<\/span>\r\nINSERT INTO products (<\/span> product_id, category, price )<\/span> VALUES (<\/span> 'coffee'<\/span>, 'beverages'<\/span>, 2.99 )<\/span>;<\/span>\r\nINSERT INTO products (<\/span> product_id, category, price )<\/span> VALUES (<\/span> 'dog'<\/span>, 'pets'<\/span>, 249.99 )<\/span>;<\/span>\r\nINSERT INTO products (<\/span> product_id, category, price )<\/span> VALUES (<\/span> 'cat'<\/span>, 'pets'<\/span>, 195.00 )<\/span>;<\/span>\r\nINSERT INTO products (<\/span> product_id, category, price )<\/span> VALUES (<\/span> 'beret'<\/span>, 'fashion'<\/span>, 34.99 )<\/span>;<\/span>\r\nINSERT INTO products (<\/span> product_id, category, price )<\/span> VALUES (<\/span> 'handbag'<\/span>, 'fashion'<\/span>, 126.00 )<\/span>;<\/span>\r\n--<\/span> Some purchases.\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'beret'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'cat'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'rick'<\/span>, 'tea'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'dave'<\/span>, 'dog'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'dave'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'beret'<\/span> )<\/span>;<\/span>\r\n--<\/span> A price increase!\r\nINSERT INTO products (<\/span> product_id, category, price )<\/span> VALUES (<\/span> 'coffee'<\/span>, 'beverages'<\/span>, 3.05 )<\/span>;<\/span>\r\n--<\/span> Some more purchases.\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'rick'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'rick'<\/span>, 'dog'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'rick'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'rick'<\/span>, 'cat'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'kris'<\/span>, 'coffee'<\/span> )<\/span>;<\/span>\r\nINSERT INTO purchases (<\/span> user_id, product_id )<\/span> VALUES (<\/span> 'yeva'<\/span>, 'handbag'<\/span> )<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u7b2c\u56db\u6b65\uff1a\u9a8c\u8bc1<\/h3>\n
\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\u6765\u9a8c\u8bc1\u6a21\u62df\u6570\u636e\u662f\u5426\u6b63\u786e\u8f93\u5165\u3002<\/p>\n
SELECT *<\/span> FROM promotion_loose_leaf;<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u83b7\u5f97\u4e86\u4ee5\u4e0b\u8f93\u51fa\uff0c\u90a3\u4e48\u81f3\u6b64\u8be5\u8fc7\u7a0b\u5df2\u7ecf\u6b63\u786e\u8fd0\u884c\u3002<\/p>\n
+-----------------------------+----------------------------------+--------------------------------------+\r\n|USER_ID \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0|PRODUCTS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0|PROMOTION_NAME \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  \u00a0 |\r\n+-----------------------------+----------------------------------+--------------------------------------+\r\n|kris \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |[coffee] \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0|loose_leaf \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0      |\r\nQuery terminated\r\n<\/code><\/pre>\n
\u9a8c\u8bc1\u7684\u89e3\u91ca de<\/h3>\n
\"image.png\"<\/div>\n
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