Question

Python版本 - 2.7.6

熊猫版 - 0.17.1

MySQLdb版本 - 1.2.5

DataFrame.to_sql()投掷pandas.io.sql.DatabaseError: Execution failed on sql 'SELECT name FROM sqlite_master WHERE type='table' AND name=?;': not all arguments converted during string formatting

Python Code Snippet

con = MySQLdb.connect('localhost', 'root', '', 'product_feed')
cur = con.cursor()
cur.execute("SELECT VERSION()")
connection_result = cur.fetchall()
print connection_result[0][0]     #It prints 5.5.44-0ubuntu0.14.04.1

table_column = ['A', 'B', 'C']
created_data = numpy.array([numpy.arange(10)]*3).T
df = pandas.DataFrame(data=created_data ,columns=table_column)
df.to_sql('test_table', con)

执行df.to_sql('test_table', con)行时出错。

错误详情

  File "/home/yogi/yogi/mlPython/product_feed/etl_pf/process_data.py", line 298, in render_df
    df.to_sql('test_table', con)
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/core/generic.py", line 1003, in to_sql
    dtype=dtype)
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/io/sql.py", line 569, in to_sql
    chunksize=chunksize, dtype=dtype)
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/io/sql.py", line 1640, in to_sql
    table.create()
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/io/sql.py", line 685, in create
    if self.exists():
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/io/sql.py", line 673, in exists
    return self.pd_sql.has_table(self.name, self.schema)
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/io/sql.py", line 1653, in has_table
    return len(self.execute(query, [name,]).fetchall()) > 0
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/io/sql.py", line 1554, in execute
    raise_with_traceback(ex)
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/pandas/io/sql.py", line 1543, in execute
    cur.execute(*args)
  File "/home/yogi/yogi/mlenv/local/lib/python2.7/site-packages/MySQLdb/cursors.py", line 187, in execute
    query = query % tuple([db.literal(item) for item in args])
pandas.io.sql.DatabaseError: Execution failed on sql 'SELECT name FROM sqlite_master WHERE type='table' AND name=?;': not all arguments converted during string formatting

I checked that pandas 0.17.1 is mostly using .format() so this error should not arise because of % formatting.

如果有人可以建议一些解决方案，那将会很有帮助。我不想尝试cursor.execute()

Answer 1

参数：

con：SQLAlchemy引擎或DBAPI2连接（传统模式）

使用SQLAlchemy可以使用该库支持的任何数据库。如果是DBAPI2对象，则仅支持sqlite3。

flavor：'sqlite'，默认无

自版本0.19.0后不推荐使用：如果不使用SQLAlchemy，'sqlite'是唯一受支持的选项。

如果使用SQLAlchemy而不是MySQLdb，那就没问题了。

Pandas DataFrame.to_sql（）错误 - 不是在字符串格式化期间转换的所有参数

1 个答案: