Cassandra ODBC 参数绑定

Question

我已经安装了 DataStax 社区版，并添加了 DataStax ODBC 连接器。现在我尝试通过 pyodbc 访问数据库：

import pyodbc
connection = pyodbc.connect('Driver=DataStax Cassandra ODBC Driver;Host=127.0.0.1',
                            autocommit = True)
cursor = connection.cursor()
cursor.execute('CREATE TABLE Test (id INT PRIMARY KEY)')
cursor.execute('INSERT INTO Test (id) VALUES (1)')
for row in cursor.execute('SELECT * FROM Test'):
    print row

它工作正常并返回

>>> (1, )

但是当我尝试时

cursor.execute('INSERT INTO Test (id) VALUES (:id)', {'id': 2})

我明白了

>>> Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "test.py", line 11, in <module>
    cursor.execute('INSERT INTO Test (id) VALUES (:id)', {'id': 2})
pyodbc.ProgrammingError: ('The SQL contains 0 parameter markers, but 1 parameters were supplied', 'HY000')

替代方案都不起作用：

cursor.execute('INSERT INTO Test (id) VALUES (:1)', (2))

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "test.py", line 11, in <module>
    cursor.execute('INSERT INTO Test (id) VALUES (?)', (2))
pyodbc.ProgrammingError: ('The SQL contains 0 parameter markers, but 1 parameters were supplied', 'HY000')

和

cursor.execute('INSERT INTO Test (id) VALUES (?)', (2))

>>> Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pyodbc.Error: ('HY000', "[HY000] [DataStax][CassandraODBC] (15) Error while preparing a query in Cassandra: [33562624] : line 1:31 no viable alternative at input '1' (...Test (id) VALUES (:[1]...) (15) (SQLPrepare)")

我的 Cassandra 版本是 2.2.3，ODBC 驱动来自https://downloads.datastax.com/odbc-cql/1.0.1.1002/

Answer 1

根据 pyodbc 文档，您的查询应该是

cursor.execute('INSERT INTO Test (id) VALUES (?)', 2)

更多详情请关注pyodbc Insert

根据评论有一个线程说这是 pyodbc 中的一个开放错误 BUG