如何使用sqlalchemy在绑定的参数中显示带有元组的最终sql文本

Question

出于调试目的，我想显示实际执行的sql。

我有一个简单的查询示例：

SELECT (id, title) 
  FROM some_table AS t
  WHERE 
    t.id IN :id_sequence
  LIMIT :count

我的python看起来像这样：

def resolve(query, **params):
    """Returns the resolved query using the input params

    Example:
        >>> query = "SELECT (id, title) FROM table AS t WHERE t.id IN :id_sequence LIMIT :count"
        >>> resolve(query, id_sequence=('1', '2'), count=5)
        SELECT (id, title) FROM table AS t WHERE t.id IN ('1', '2') LIMIT 5

    Args:
        query: the text to query
        params: the map of bound parameters and their values

    Returns:
        fully resolved text
    """
    import sqlalchemy
    sql = sqlalchemy.text(query)
    # Capture only the parameters that are actually in the query
    bound_parameters = sql.params(**params).compile().params
    # Then bind only those captured parameters
    bound_sql = sql.bindparams(**bound_params)
    compiled_sql = bound_sql.compile(compile_kwargs={"literal_binds": True})
    return str(compiled_sql)

对于以下参数值：

{'id_sequence': ('1', '2'), 'limit': 5}

使用上述sql，我的期望是最终得到：

SELECT (id, title) 
  FROM some_table AS t
  WHERE 
    t.id IN ('1', '2')
  LIMIT 5

我真正看到的是：

SELECT (id, title) 
  FROM some_table AS t
  WHERE 
    t.id IN NULL
  LIMIT 5