Скачать или смотреть How to Use executemany with Date and Datetime in cx_Oracle Without Encountering ORA-01861 Errors

Learn how to effectively use cx_Oracle's `executemany()` method for inserting Date and Datetime values into an Oracle database, avoiding common errors like ORA-01861.
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Mastering Date and Datetime Insertion in cx_Oracle Without Errors

When working with databases, correctly handling dates and datetimes can often lead to frustrating errors. One common hurdle for Python developers using the cx_Oracle library is the ORA-01861 error, which indicates that a date literal does not match the required format string. If you're seeking to insert records that include date and datetime fields efficiently, you're in the right place. This guide will break down how to properly use the executemany() method to overcome this issue.

The Challenge: ORA-01861 Error

The ORA-01861 error occurs when the format of date literals does not match the date format expected by the Oracle database. It often surfaces when programmers try to insert Python datetime objects without properly converting them to a suitable format.

Database Structure

To illustrate, let’s consider the following structure of a table named test_db:

[[See Video to Reveal this Text or Code Snippet]]

This table contains three columns that need to be populated: a string message, a date, and a timestamp.

Solution: Efficiently Use executemany

To run the executemany() method successfully without facing the ORA-01861 error, it’s essential to format the input data appropriately. Below is a step-by-step guide to achieve this.

Step 1: Import Necessary Libraries

You will need to import cx_Oracle, pandas, and datetime components in your Python script:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Prepare Your Data

Begin by organizing your input data in a structured format, such as a DataFrame using Pandas, as shown here:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Convert Data and Create Tuples for Insertion

Next, you’ll want to create a list that holds tuples with your data, ensuring the dates are converted appropriately:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Execute the Insert

Finally, establish a connection to your Oracle database using cx_Oracle, then utilize the executemany() function to insert all rows in one go:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these clear steps, you can effectively insert Date and Datetime values into your Oracle database using cx_Oracle's executemany() without encountering common pitfalls like the ORA-01861 error. Remember to convert your date strings to the correct format and package your data as tuples to keep your code clean and efficient.

Happy coding!