NotSupportedError: Python value cannot be converted to a database value

解决方法

cx_Oracle 版本 < 7.1

1. perform all inserts in a single batch (but depending on size this might not be usable)
2. create a new cursor for each batch (so that cx_Oracle calculates the types for each batch)
3. use cursor.setinputsizes() to specify the types and sizes (may be cumbersome)

db_types = (d[1] for d in cursor_select.description)
cursor_insert.setinputsizes(*db_types)

cx_Oracle 版本 >= 7.1

该 bug 已被修复。
但又会有新的 bug:

 "DPI-1044: value cannot be represented as an Oracle number", // DPI_ERR_NUMBER_NO_REPR

暂且没找到解决方法，那还是用旧版的先吧。。

参考

• cx_Oracle github issue

• cx_Oracle - dynamic cursor.setinputsizes