Typical Behavior of Money in Databases
When dealing with money in a database, one common question arises: How do you save money in a database? Or, How do you define a column for money?
For example, you might define a column like this:
Then, when displaying the price, you may use the following:
However, this method can introduce issues. Let me explain why this is not the best approach.
The Issue with Rounding
Let’s walk through an example:
So, when you retrieve the price from the database:
Notice that the result of 107.0277922077922
differs slightly from the original rate of 107.0277
. The decimal rounding issue has caused a slight discrepancy.
The Correct Approach
To avoid this rounding issue, you should store the full decimal value in the database. This means you should not restrict the decimal places when saving money.
Here’s how to do it:
By saving the full decimal value, you’ll avoid any rounding problems. Later, when you need to display the price, you can use:
This way, you store the exact value and only format it when necessary for display.
Conclusion
Storing the full decimal value of money ensures that you avoid rounding issues when doing calculations or currency conversions. By using the approach mentioned above, you'll be able to handle money accurately in your database.
I hope this will be helpful in your future projects. Thank you for reading, and thank you for your continued support! š