How to Fix String to Integer Conversion Error When Inserting Data into SQL Database

Summary: Learn how to fix the common error encountered when inserting strings that need to be converted to integers in an SQL database, focusing on VB.NET and Azure SQL Database solutions.
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How to Fix String to Integer Conversion Error When Inserting Data into SQL Database

Encountering a String to Integer Conversion Error when inserting data into an SQL database can be frustrating. However, understanding the cause and knowing how to fix it can save you both time and effort. This guide will walk you through the steps and considerations to effectively handle this error in your VB.NET applications, especially when working with an Azure SQL Database.

Understanding the Error

This error generally occurs when you attempt to insert a string value into a database column that requires an integer type. The SQL server expects numeric values in those columns and when it tries to convert your string data, it fails, throwing an error.

Common Scenario

Suppose you have a table in your Azure SQL Database defined as follows:

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

Inserting a record where the Age value is a string can trigger the conversion error:

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The above INSERT statement will fail because the Age column expects an integer value, not a string.

Fixing the Error in VB.NET

To handle this in VB.NET, you should ensure that the data being passed to the SQL query is of the correct type.

Conversion using VB.NET

Here's how you can safely convert and insert integer values:

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Key Points

Use Parameters to avoid SQL injection and ensure type safety.

Utilize Integer.TryParse to convert strings to integers safely.

Handle conversion errors gracefully using conditional checks.

Conclusion

Converting strings to integers is a common task when working with SQL databases, and failing to do it correctly can lead to type conversion errors. By using proper data validation and VB.NET techniques, you can reliably insert integer values and avoid these errors.

Whether you are using a local SQL Server or an Azure SQL Database, these practices will help you maintain robust and error-free database operations.

Keep coding, and may your data always be in the correct type!

[salomenjoroge-soid]

Thanks but mine is displaying General error: 1366 Incorrect integer value: 'undefined' for column can you help me to solve that will appreciate.