从 Oracle 表中查询 JSON 数据字段

Question

ORACLE：我的“TESTREPAIR”表中有一个字段，其中一列“DETAILS”存储以下 JSON。

{
    "repairActions": [
        {
            "symptom": 524,
            "defect": "Defective Component",
            "action": "Reflow"
        },
        {
            "symptom": 506,
            "defect": "Cosmetic",
            "action": "Repaired Component"
        },
        {
            "symptom": 509,
            "defect": "Defective Component",
            "action": "Swapped"
        }
    ]
}

我正在使用 SELECT 语句从上述 JSON 数据字段中查询症状。

像这样。

SELECT
    r.details.repairactions.symptom[0],
    r.details.repairactions.symptom[1],
    r.details.repairactions.symptom[2]
FROM
    testrepair r;

上面的查询返回 null。 我想要的输出是

symptom1: 524
symptom2: 506
symptom3: 509

Answer 1

您希望将数组索引放在正确的位置并使用与 JSON 大小写匹配的带引号的标识符：

SELECT r.details."repairActions"[0]."symptom" AS symptom1,
       r.details."repairActions"[1]."symptom" AS symptom2,
       r.details."repairActions"[2]."symptom" AS symptom3
FROM   testrepair r;

其中，对于样本数据：

CREATE TABLE testrepair (details JSON);

INSERT INTO testrepair (details)
VALUES ('{
    "repairActions": [
        {
            "symptom": 524,
            "defect": "Defective Component",
            "action": "Reflow"
        },
        {
            "symptom": 506,
            "defect": "Cosmetic",
            "action": "Repaired Component"
        },
        {
            "symptom": 509,
            "defect": "Defective Component",
            "action": "Swapped"
        }
    ]
}');

输出：

症状1	症状2	症状 3
524	506	509

db<> 在这里摆弄