TypeError: %d format: a number is required, not str - 数据库字段是字符串，传递的变量是字符串格式的数字

Question

我有一个基于字符串字段进行过滤的查询，其中包含前导零的电话号码。 我的查询使用%s作为占位符，变量在执行时传递给查询，如下所示：

rows = (('01234567891',), ('01234567892',), ('01234567893',))

dbQuery2 = """
SELECT DATE_FORMAT(DATE(ch.start), '%d/%m/%Y') As CallDate,
             ch.did AS InboundNo,
             COUNT(*) AS DayTotal
      FROM call_history ch LEFT JOIN
           ast_queue_log aql
           ON aql.event = 'ENTERQUEUE' AND aql.callid = ch.callid
      WHERE ch.did = %s AND
            ch.start BETWEEN DATE_FORMAT(NOW(), '%Y-%m-01') AND NOW()
      GROUP BY ch.did, DATE(ch.start)
      ORDER BY ch.did, DATE(ch.start)
     ;
"""

for row in rows:
    cur2.execute(dbQuery2, row)
    subrows = cur.fetchall()

导致问题的数据库字段是：

`did` varchar(32) NOT NULL DEFAULT '',`

错误是：

TypeError: %d format: a number is required, not str

Answer 1

这里的问题是 SQL 查询中的DATE_FORMAT字符串。 %d 、 %m和%Y被解释为变量占位符并且 MySQLdb 引擎尝试替换那里的变量而不是WHERE子句中的变量。

通过在查询中使用以下格式修复：

dbQuery2 = """
SELECT DATE_FORMAT(DATE(ch.start), '%%d/%%m/%%Y') As CallDate,
         ch.did AS InboundNo,
         COUNT(*) AS DayTotal
  FROM call_history ch LEFT JOIN
       ast_queue_log aql
  ON aql.event = 'ENTERQUEUE' AND aql.callid = ch.callid
  WHERE ch.did = %s AND
            ch.start BETWEEN DATE_FORMAT(NOW(), '%%Y-%%m-01') AND NOW()
  GROUP BY ch.did, DATE(ch.start)
  ORDER BY ch.did, DATE(ch.start)
 ;

"""