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Json Value 和Json Query

功能概述

Json Value 和Json Query 函数也可以在SQL语句中使用。

Json Value 函数返回一个值，而Json Query 函数则用来返回一个对象或数组。

示例

比如我们来看下边这一段JSON：

{
  "a": "[1,2]",
  "b": [1, 2],
  "c": "hi"
}

在这个例子中，可见“a”和 "c" 的值均为字符串类型，而“b” 的值是一个数组。

那么接下来，我们来看使用Json Value 和Json Query 函数分别可以返回什么结果：

Path	JSON_VALUE 返回	JSON_QUERY 返回
$	NULL or error	{ "a": "[1,2]", "b": [1,2], "c":"hi"}
$.a	[1,2]	NULL or error
$.b	NULL or error	[1,2]
$.b[0]	1	NULL or error
$.c	hi	NULL or error

那么我们在系统中怎样使用呢？比如我们可以结合表值函数来使用，如下图所示。

首先使用 JsonQuery 返回 [1,2]，然后使用表值函数 UnwindJson 将其展开。最终的结果为：