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import mysql.connector

def add_features_to_db(stockname, timeframe, date, feature):
    try:
        conn = mysql.connector.connect(
        user='root', password='', host='localhost', database='fx003')

    cursor = conn.cursor()
    dbtable = stockname + timeframe
    mySql_insert_query = """INSERT INTO `%s` (date, trend) VALUES ( `%s`, `%s` )""" 

    record = (dbtable, date, feature) 
    cursor.execute(mySql_insert_query, record)
    conn.commit()
    
    print("Record inserted successfully")

except mysql.connector.Error as error:
    print("Failed to insert into MySQL table {}".format(error))

finally:
    if conn.is_connected():
        cursor.close()
        conn.close()
        print("MySQL connection is closed")

add_features_to_db("aud-cad", "_30mins", "2021-09-24 21:00:00", "Short")

我有上面的代码，并给了我以下错误：

Failed to insert into MySQL table 1146 (42S02): Table 'fx003.'aud-cad_30mins'' doesn't exist

aud-cad_30mins 表确实存在，并且插入查询如下所示：

mySql_insert_query = """INSERT INTO aud-cad_30mins (date, trend) VALUES ( "2021-09-24 21:00:00","Short"  )"""

因此，当我尝试在查询中使用变量时，它会给出错误。为什么表名得到不需要的引号？检查了几个教程，但找不到解决方案，有什么想法吗？

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1 回答 1

2

表名应该在查询字符串中硬编码，而不是作为占位符%s，这意味着要插入的值。因此，如果变量中有表名，则可以format()在调用之前通过替换它cursor.execute()

dbtable = stockname + timeframe
mySql_insert_query = """INSERT INTO {} (date, trend) VALUES ( %s, %s )""".format(dbtable)

请参阅文档中的示例

%s编辑：正如比尔在评论中提到的，不要在占位符周围添加反引号。

于 2021-09-26T20:24:37.997 回答