python datetime.date与SQL日期不匹配

时间:2017-02-08 08:51:25

标签: python datetime pyodbc netezza

我有一些数据,我想在netezza中插入表格:

import pyodbc
data=[['GZ', datetime.date(2017, 2, 8), 19.7, 10.7, 0, '1级'], 
      ['GZ', datetime.date(2017, 2, 9), 16.3, 9.7, -1, '微风'], 
      ['GZ', datetime.date(2017, 2, 10), 16.0, 10.0, -1, '微风']]
conn = pyodbc.connect("DRIVER={NetezzaSQL}; SERVER=**;DATABASE=weather; UID=**; PASSWORD=**;")
cur = conn.cursor()
for i in data:
   cur.execute("""
         insert into WEATHER_INFO(location,weather_date,high_tempature,low_tempature,weather,wind)
         values(\'%s\',%s,%s,%s,%s,\'%s\')
         """ % (i[0], i[1], i[2], i[3], i[4], i[5]))
   conn.commit()
cur.execute('select * from WEATHER_INFO')
print(cur.fetchall())
cur.close()
conn.close()

我得到一些错误:

pyodbc.Error: ('HY000', "[HY000] ERROR:  Attribute 'WEATHER_DATE' is of type 'DATE' 
but expression is of type 'INT4'\n\tYou will need to rewrite or cast the expression (46) 
(SQLExecDirectW)")

这是表结构:

create table weather(
 location varchar(20),
 weather_date date,
 high_tempature float(4,1),
 low_temputare float(4,1),
 weather int(11),
 wind varchar(20)
);

我知道python datime.date应该与SQL date匹配。我通过搜索stackoverflow得不到我想要的答案。那我该如何解决这个问题?

1 个答案:

答案 0 :(得分:1)

您的问题是您使用字符串格式化运算符%来创建动态SQL ,并且这些SQL语句格式不正确。如果我们打印出您尝试执行的实际语句,它们看起来像

insert into WEATHER_INFO(location,weather_date,high_tempature,low_tempature,weather,wind)
values('GZ',2017-02-08,19.7,10.7,0,'1级')

请注意,日期值作为2017-02-08插入,没有分隔符,因此它被解释为整数表达式。

您需要做的是使用正确的参数化查询

sql = """\
insert into WEATHER_INFO(location,weather_date,high_tempature,low_tempature,weather,wind)
values(?,?,?,?,?,?)
"""
for i in data:
    cur.execute(sql, i)
    conn.commit()

或者只是

sql = """\
insert into WEATHER_INFO(location,weather_date,high_tempature,low_tempature,weather,wind)
values(?,?,?,?,?,?)
"""
cur.executemany(sql, data)
conn.commit()