Question

我正在尝试将json文件中的两列插入到SQL Server表中。问题是我不知道如何使用FROM OPENJSON()子句到达json文件中的相关列。

我想将JSON文件中的YYYYMMDD和FN列插入SQL Server表中。但仅当表中的日期（天气）尚不存在时。

问题是这在SQL代码中不起作用：

OPENJSON(@WEATHER, '$.rows.value.doc')

您可以在下面看到JSON和SQL代码。我究竟做错了什么？

JSON文件（带有两个示例行）：

{
    "total_rows": 24882,
    "offset": 0,
    "rows": [{
        "id": "FFF271C4-C061-49C4-94D1-F8E067AB8D46",
        "key": "FFF271C4-C061-49C4- 
    94D1-F8E067AB8D46",
        "value": {
            "rev": "1- 
    9853570e768e8b39a0b86ff81faeb86d"
        },
        "doc": {
            "_id": "FFF271C4-C061-49C4-94D1- 
    F8E067AB8D46",
            "_rev": "1- 
 9853570e768e8b39a0b86ff81faeb86d",
            "STN": 275,
            "YYYYMMDD": 19550601,
            "DDVEC": 25,
            "F 
HVEC": 21,
            "FG": 26,
            "FHX": 51,
            "FHXH": 14,
            "FHN": 0,
            "FHNH": 21,
            "TG": 151,
            "TN": 79,
            "TNH": 4,
            "TX": 219,
            "TXH": 12,
            "PG": 10179,
            "PX": 10208,
            "PN": 10155,
            "VVN": 60,
            "VVNH": 4,
            "VVX": 80,
            "VVXH": 16,
            "NG": 6
        }
    },
    {
        "id": "FFF83E49-F3E9-4584-A8DA-54EB0A60ACFB",
        "key": "FFF83E49-F3E9-4584-A8DA-54EB0A60ACFB",
        "value": {
            "rev": "1-c2085207ba02d355cb3a1d4d9f05f0bf"
        },
        "doc": {
            "_id": "FFF83E49-F3E9-4584-A8DA-54EB0A60ACFB",
            "_rev": "1-c2085207ba02d355cb3a1d4d9f05f0bf",
            "STN": 275,
            "YYYYMMDD": 19730725,
            "DDVEC": 301,
            "FHVEC": 41,
            "FG": 46,
            "FHX": 82,
            "FHXH": 15,
            "FHN": 5,
            "FHNH": 3,
            "FXX": 123,
            "FXXH": 14,
            "TG": 135,
            "TN": 45,
            "TNH": 3,
            "TX": 192,
            "TXH": 12,
            "T10N": 31,
            "SQ": 76,
            "SP": 48,
            "PG": 10083,
            "PX": 10107,
            "PN": 10067,
            "VVN": 3,
            "VVNH": 3,
            "VVX": 80,
            "VVXH": 13,
            "NG": 5,
            "UG": 79,
            "UX": 99,
            "UXH": 4,
            "UN": 51,
            "UNH": 12
        }
    }]
}

T-SQL代码：

DECLARE @WEATHER VARCHAR(MAX)

SELECT @WEATHER = BulkColumn
FROM OPENROWSET 
(BULK 'C:\WeatherData.json', SINGLE_CLOB) AS j

BEGIN TRY
    IF (ISJSON(@WEATHER)=1)
    BEGIN
        INSERT INTO WEATHER(DATE, DDVEC, LOADDATETIME, SOURCE)
            SELECT  
                J.[DATE], J.DDVEC, CURRENT_TIMESTAMP, 'KN'
            FROM 
                OPENJSON(@WEATHER, '$.rows.value.doc')
            WITH 
                ([DATE] INT      '$.YYYYMMDD',
                 DDVEC  SMALLINT '$.DDVEC') J
            WHERE 
                NOT EXISTS (SELECT DATE FROM WEATHER H 
                            WHERE H.DATE = J.DATE)
    END
    ELSE
        RAISERROR ('Unvalid JSON file', 16, 1);
    END TRY
    BEGIN CATCH
        THROW
    END CATCH

Answer 1

您在JSON路径中有错误。正确的from子句看起来像这样

from openjson(@WEATHER,'$.rows')--path to array
with (
[date] int '$.doc.YYYYMMDD',--path in array element
ddvec smallint '$.doc.DDVEC'
)

从json文件中选择两列到SQL Server

1 个答案: