1

我在 MariaDB 数据库的表中的字段中有这个 JSON 结构：

table column name: BcDJSON

{"placards":
     [
     {"barcode":"???","destination":"???","weight":"???"}, 
     {"barcode":"???","destination":"???","weight":"???"},
     {etc..}
    ]
}

我的 sql 查询当前看起来像：

"SELECT * from table WHERE BcDJSON LIKE '%.$value.%'";

但这不会产生稳定的代码。我曾尝试使用 JSON_EXTRACT，但将一个对象转换为 MariaDB 中的一组对象：我尝试了一些变体 - 阅读文档并没有回答我的问题。JSON_EXTRACT 是我真正想在这里使用的吗？我需要返回整行 - 该 JSON 结构中存在条形码。

我尝试过的语法：（？？？=有效值）

SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.barcode') = '???'
SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.placards, $.barcode') = '???'
SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.placards.$.barcode') = '???'
SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.placards->$.barcode') = '???'
SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.placards$.barcode') = '???'
SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.placards') = '???'
SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.placards', '$.barcode') = '???'
SELECT * from datawork WHERE JSON_EXTRACT('BcDJSON', '$.placards.barcode') = '???'
4

1 回答 1

1

您应该使用JSON_SEARCH来查看是否可以在以下值之一中找到该barcode值：

SELECT * 
FROM datawork
WHERE JSON_SEARCH(BcDJSON, 'one', '???', NULL, '$.placards[*].barcode') IS NOT NULL

例如：

CREATE TABLE datawork (id int auto_increment primary key,
                       BcDJSON TEXT);
INSERT INTO datawork (BcDJSON) values 
('{"placards":
     [
     {"barcode":"123","destination":"a","weight":"1"}, 
     {"barcode":"456","destination":"b","weight":"2"}
    ]
}'),
('{"placards":
     [
     {"barcode":"789","destination":"a","weight":"1"}, 
     {"barcode":"123","destination":"b","weight":"2"}
    ]
}');
SELECT * 
FROM datawork 
WHERE JSON_SEARCH(BcDJSON, 'one', '123',  NULL,'$.placards[*].barcode') IS NOT NULL

输出：

id  BcDJSON
1   {"placards": [ {"barcode":"123","destination":"a","weight":"1"}, {"barcode":"456","destination":"b","weight":"2"} ] }
2   {"placards": [ {"barcode":"789","destination":"a","weight":"1"}, {"barcode":"123","destination":"b","weight":"2"} ] }

dbfiddle 上的演示

于 2020-01-20T23:55:16.270 回答