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mysql - 范围之间的MySql JSON查询

问题描述

我有一张桌子card_percentage，带有 DDL：

CREATE TABLE card_percentage
(
    id   int UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    jdoc json NULL
);

它有一行数据

id | jdoc
------------ 
 1 | {"AMXC": [{"enabled": "y", "bank_code": "AMXC", "max_amount": 99999999.99, "min_amount": 0.0, "percentage": 2.5}], "VISA": [{"enabled": "y", "bank_code": "VISA", "max_amount": 1999.99, "min_amount": 0.0, "percentage": 2.8}, {"enabled": "y", "bank_code": "VISA", "max_amount": 99999999.99, "min_amount": 2000.0, "percentage": 1.8}]}

美化 JSON 以提高可读性

{
  "AMXC": [
    {
      "enabled": "y",
      "bank_code": "AMXC",
      "min_amount": 0.0,
      "max_amount": 99999999.99,
      "percentage": 2.5
    }
  ],
  "VISA": [
    {
      "enabled": "y",
      "bank_code": "VISA",
      "min_amount": 0.0,
      "max_amount": 1999.99,
      "percentage": 2.8
    },
    {
      "enabled": "y",
      "bank_code": "VISA",
      "min_amount": 2000.0,
      "max_amount": 99999999.99,
      "percentage": 1.8
    }
  ]
}

现在我想选择percentage金额VISA在和200之间的时间。为此，我正在使用以下查询，但它在结果集中没有给出任何内容。min_amountmax_amount

SELECT id,
       jdoc -> '$.VISA[*].percentage' percentage
FROM card_percentage
WHERE id = 1
  AND jdoc -> '$.VISA[*].min_amount' <= 200
  AND jdoc -> '$.VISA[*].max_amount' >= 200
;

标签： mysqlsqljsonmysql-8.0

解决方案

好的，基于@Akina 关于使用 JSON_TABLE 的评论，我做了进一步的研究。

以下是我的查询，效果很好。

SELECT id, jdoc.percentage
FROM card_percentage, JSON_TABLE(
             jdoc,
             '$.VISA[*]'
             COLUMNS (
                 rowid FOR ORDINALITY,
                 enabled VARCHAR(1) PATH '$.enabled' DEFAULT '"n"' ON EMPTY DEFAULT '"n"' ON ERROR,
                 bank_code VARCHAR(4) PATH '$.bank_code' DEFAULT '"NCOD"' ON EMPTY ,
                 min_amount INT PATH '$.min_amount' DEFAULT '0' ON EMPTY ,
                 max_amount INT PATH '$.max_amount' DEFAULT '0' ON EMPTY ,
                 percentage DECIMAL(10, 2) PATH '$.percentage' DEFAULT '0' ON EMPTY DEFAULT '0' ON ERROR
                 )
         ) AS jdoc
WHERE jdoc.min_amount <= 200
  AND jdoc.max_amount >= 200
;

为了让这项工作发挥作用，这篇文章“JSON_TABLE – 两全其美”确实很有帮助。

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