如何正确使用字符串来创建 Python MySQL 查询？答案

【问题标题】：How do I properly use strings to create a Python MySQL query?如何正确使用字符串来创建 Python MySQL 查询？
【发布时间】：2019-04-01 16:48:43
【问题描述】：

我正在尝试用 Python 编写一个 MySQL 查询，但是当我尝试执行它时，我不断收到语法错误 #1064 (42000)。数据已提取，但错误导致查询无法完成。

    mysql.connector.errors.ProgrammingError: 1064
    (42000): You have an error in your SQL syntax; check
    the manual that corresponds to your MySQL server
    version for the right syntax to use near '1
'(data in address_line_1)' NULL '(data in city field)'
'(data in postal code field)' '(data in state code field)' 'US'
(latitude data) (longitude data) '(first two characters of is_active field data)' at line 1

它或多或少地告诉我错误在哪里，但没有告诉我是什么原因造成的。我想我可能无法正确引用查询字符串中的某些内容。我不知道错误是什么，因为对我来说，查询似乎是正确的，而且我不知道 Python MySQL 能够诊断格式错误的所有特性。

这是创建表的命令（这个有效，经过数小时的调整）：

    sql=("CREATE TABLE IF NOT EXISTS `locations` ("
"   `id` BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,"
"   `location_id` VARCHAR(48),"
"   `is_valid` BOOLEAN,"
"   `street_line_1` VARCHAR(48),"
"   `street_line_2` VARCHAR(48),"
"   `city` VARCHAR(16),"
"   `postal_code` VARCHAR(8),"
"   `state_code` CHAR(2),"
"   `country_code` CHAR(2),"
"   `latitude` DECIMAL(10,6),"
"   `longitude` DECIMAL(10,6),"
"   `accuracy` VARCHAR(12),"
"   `is_active` BOOLEAN,"
"   `is_commercial` BOOLEAN,"
"   `is_forwarder` BOOLEAN,"
"   `delivery_point` VARCHAR(18),"
"   `last_sale_date` DATE,"
"   `total_value` INT(12)"
")  ENGINE = InnoDB")

这 17 个字段不是自动递增的 ID 键。这是实际的插入查询：

    sql = ("INSERT INTO `locations`(`location_id`, `is_valid`, `street_line_1`,"
"   `street_line_2`, `city`, `postal_code`, `state_code`, `country_code`,"
"   `latitude`, `longitude`, `accuracy`, `is_active`, `is_commercial`,"
"   `is_forwarder`, `delivery_point`, `last_sale_date`, `total_value`)"
"   VALUES(%s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s)")

我错过了什么？谢谢你的帮助。

【问题讨论】：

标签： python mysql string-formatting mysql-connector

【解决方案1】：

我猜你的值不会包含“，”所以 VALUES(%s %s....) 不正确。您需要改用 VALUES(%s, %s, ...)。

【讨论】：

【解决方案2】：

第一个建议是用逗号分隔 %s

 sql = ("INSERT INTO `locations`(`location_id`, `is_valid`, `street_line_1`,"
"   `street_line_2`, `city`, `postal_code`, `state_code`, `country_code`,"
"   `latitude`, `longitude`, `accuracy`, `is_active`, `is_commercial`,"
"   `is_forwarder`, `delivery_point`, `last_sale_date`, `total_value`)"
"   VALUES(%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)")

【讨论】：