JSONCompactEachRowWithNamesAndTypes

Documentation sur le format JSONCompactEachRowWithNamesAndTypes

Entrée	Sortie	Alias
✔	✔

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Description

Se distingue du format JSONCompactEachRow en ce qu’il affiche également deux lignes d’en-tête contenant les noms et les types des colonnes, à l’image du format TabSeparatedWithNamesAndTypes.

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Exemple d’utilisation

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Insertion de données

À l’aide d’un fichier JSON nommé football.json et contenant les données suivantes :

["date", "season", "home_team", "away_team", "home_team_goals", "away_team_goals"]
["Date", "Int16", "LowCardinality(String)", "LowCardinality(String)", "Int8", "Int8"]
["2022-04-30", 2021, "Sutton United", "Bradford City", 1, 4]
["2022-04-30", 2021, "Swindon Town", "Barrow", 2, 1]
["2022-04-30", 2021, "Tranmere Rovers", "Oldham Athletic", 2, 0]
["2022-05-02", 2021, "Port Vale", "Newport County", 1, 2]
["2022-05-02", 2021, "Salford City", "Mansfield Town", 2, 2]
["2022-05-07", 2021, "Barrow", "Northampton Town", 1, 3]
["2022-05-07", 2021, "Bradford City", "Carlisle United", 2, 0]
["2022-05-07", 2021, "Bristol Rovers", "Scunthorpe United", 7, 0]
["2022-05-07", 2021, "Exeter City", "Port Vale", 0, 1]
["2022-05-07", 2021, "Harrogate Town A.F.C.", "Sutton United", 0, 2]
["2022-05-07", 2021, "Hartlepool United", "Colchester United", 0, 2]
["2022-05-07", 2021, "Leyton Orient", "Tranmere Rovers", 0, 1]
["2022-05-07", 2021, "Mansfield Town", "Forest Green Rovers", 2, 2]
["2022-05-07", 2021, "Newport County", "Rochdale", 0, 2]
["2022-05-07", 2021, "Oldham Athletic", "Crawley Town", 3, 3]
["2022-05-07", 2021, "Stevenage Borough", "Salford City", 4, 2]
["2022-05-07", 2021, "Walsall", "Swindon Town", 0, 3]

Insérez les données :

INSERT INTO football FROM INFILE 'football.json' FORMAT JSONCompactEachRowWithNamesAndTypes;

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Lire les données

Lisez les données au format JSONCompactEachRowWithNamesAndTypes :

SELECT *
FROM football
FORMAT JSONCompactEachRowWithNamesAndTypes

La sortie sera au format JSON :

["date", "season", "home_team", "away_team", "home_team_goals", "away_team_goals"]
["Date", "Int16", "LowCardinality(String)", "LowCardinality(String)", "Int8", "Int8"]
["2022-04-30", 2021, "Sutton United", "Bradford City", 1, 4]
["2022-04-30", 2021, "Swindon Town", "Barrow", 2, 1]
["2022-04-30", 2021, "Tranmere Rovers", "Oldham Athletic", 2, 0]
["2022-05-02", 2021, "Port Vale", "Newport County", 1, 2]
["2022-05-02", 2021, "Salford City", "Mansfield Town", 2, 2]
["2022-05-07", 2021, "Barrow", "Northampton Town", 1, 3]
["2022-05-07", 2021, "Bradford City", "Carlisle United", 2, 0]
["2022-05-07", 2021, "Bristol Rovers", "Scunthorpe United", 7, 0]
["2022-05-07", 2021, "Exeter City", "Port Vale", 0, 1]
["2022-05-07", 2021, "Harrogate Town A.F.C.", "Sutton United", 0, 2]
["2022-05-07", 2021, "Hartlepool United", "Colchester United", 0, 2]
["2022-05-07", 2021, "Leyton Orient", "Tranmere Rovers", 0, 1]
["2022-05-07", 2021, "Mansfield Town", "Forest Green Rovers", 2, 2]
["2022-05-07", 2021, "Newport County", "Rochdale", 0, 2]
["2022-05-07", 2021, "Oldham Athletic", "Crawley Town", 3, 3]
["2022-05-07", 2021, "Stevenage Borough", "Salford City", 4, 2]
["2022-05-07", 2021, "Walsall", "Swindon Town", 0, 3]

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Paramètres de format

Si le paramètre input_format_with_names_use_header est défini sur 1, les colonnes des données d’entrée seront mises en correspondance avec les colonnes de la table selon leur nom, et les colonnes dont le nom est inconnu seront ignorées si le paramètre input_format_skip_unknown_fields est défini sur 1. Sinon, la première ligne sera ignorée. Si le paramètre input_format_with_types_use_header est défini sur 1, les types des données d’entrée seront comparés à ceux des colonnes correspondantes de la table. Sinon, la deuxième ligne sera ignorée.