我有一个 JSON 对象,其中包含账单下的产品列表。我想为此编写一个 MySQL 函数,该函数从 JSON 中读取数据,逐一迭代并将相同的数据插入到产品和账单表中。
这是我的 JSON 对象:
{"billNo":16,"date":"2017-13-11 09:05:01","customerName":"Vikas","total":350.0,"fixedCharges":100,"taxAmount":25.78,"status":paid,"product":[{"productId":"MRR11","categoryId":72,"categoryName":"Parker Pen","cost":200,"quantity":2,"log":{"supplierId":"725","supplierName":"Rihant General Stores"}},{"productId":"MRR12","categoryId":56,"categoryName":"Drawing Books","cost":150,"quantity":3,"log":{"supplierId":"725","supplierName":"Rihant General Stores"}}]}
这里我有一个MySQL函数,可以从JSON中读取数据。
CREATE DEFINER=`mydb`@`%` FUNCTION `raiseOrder`(dataObject Json)
RETURNS bigint(11)
BEGIN
DECLARE billNo BIGINT(11) DEFAULT NULL;
DECLARE customerName VARCHAR(64);
DECLARE date datetime DEFAULT NOW();
DECLARE total Float(12,2);
DECLARE taxamt Float(12,2);
DECLARE fixedCharges Float(12,2);
DECLARE products json;
DECLARE productId bigint(15) DEFAULT NULL;
DECLARE categoryId bigint(11);
DECLARE cost float;
DECLARE categoryName varchar(64);
DECLARE quantity int default 0;
DECLARE supplierId bigint(11);
DECLARE supplierName varchar(128);
SET billNo = (SELECT JSON_EXTRACT(dataObject, "$.billNo"));
SET customerName = (SELECT JSON_EXTRACT(dataObject, "$.customerName"));
SET products = (SELECT JSON_EXTRACT(dataObject, "$.products"));
SET productId = (SELECT JSON_EXTRACT(products, "$[0].productId"));
RETURN 1;
END
现在有了这些线条
SET products = (SELECT JSON_EXTRACT(dataObject, "$.products"));
SET productId = (SELECT JSON_EXTRACT(products, "$[0].productId"));
我已经获得了产品内部信息的JSON数据和第0个产品的ID。但是我希望有一种方法可以遍历产品数组。
我获取了产品的内部信息JSON和第一个产品的ID,但是我想找一种方法来迭代整个产品数组。