Question

有谁可以告诉我为什么这不会返回任何结果？我正在尝试将数据从JSON列复制到新列中，将这些结果乘以 10％，然后在10％增加的人口旁边显示原始人口。

Python似乎运行它，但没有返回结果。

try:
      query = ("UPDATE city SET Population = info->'$.Population' WHERE info->'$.Population' > 0")
      cursor.execute(query)
      conn.commit()

except Exception as ex:
    print("cursor execution failure: " + str(ex))
query = ("SET Population = Population * 1.1")
cursor.execute(query)
conn.commit()
except Exception as ex:
    print("cursor execution failure: " + str(ex))
query = ("SELECT Name, info->’$.Population’, Population FROM city;")
cursor.execute(query)

except Exception as ex:
        print("cursor execution failure: " + str(ex))
    for row in cursor:
        print(u"{:<45} {:<45}".format(*row))

Answer 1

SET的SQL语法为false，您必须替换：

query = ("SET Population = Population * 1.1")

通过

query = ("UPDATE city SET Population = Population * 1.1")

Python没有返回任何MySQL结果

1 个答案: