Question

如何在“：songs”中传递列表？

如果我传递一个key：value对，那么原始SQL将起作用，但是当我尝试传递一个列表时，它将不起作用。我收到AttributeError：列表对象没有属性“键”。

    songs = ('Song1', 'Song2', 'Song3', 'Song4', 'Song5')
    engine = app.db.engine
    connection = engine.connect()
    rawSqlResult = text(
    "SELECT * FROM AlbumView WHERE Song IN :songs")
    queryResult = connection.execute(rawSqlResult, songs)

    tempDict, resultList = {}, []
    for rowproxy in queryResult:
        for tup in rowproxy.items():
            tempDict = {**tempDict, **{tup[0]: tup[1]}}
        resultList.append(tempDict)
        print(resultList)

Answer 1

This approach解决了我的问题：

my_list = ['peach', 'grape', 'apple']
query_parameters = {}
counter = 1
for list_item in my_list:
    query_parameters["list_item" + str(counter)] = list_item
    counter += 1

where_clause = 'fruits IN(:' + ",:".join(query_parameters.keys()) + ')' # create clause to be inserted into query
query_text = db.text("""
    SELECT fruits
    FROM table
    WHERE """ + where_clause + """ """)

result = db.engine.execute(query_text, **query_parameters)

原始SQL_Flask SQLAlchemy：使用列表IN绑定参数

1 个答案: