How to Correctly Use Golang\'s ... Operator for Bulk Inserts with GORM to Avoid Column Count Mismatches?

Golang Join Array Interface for Bulk Insert

In this context, you are trying to create a bulk insert using GORM and received an error due to a mismatch in the number of columns and values in the SQL query you generated. To resolve this issue, you need to correctly format the array interface to generate the desired string sequence.

The solution lies in using the ... spread operator when passing the slice elements to the Exec() function. This operator unpacks the slice and passes each element individually as a parameter.

Here's the modified code snippet that addresses the issue:

tx.Exec(sqlStr, vals...)

In this modified version, vals... is used instead of vals to pass the slice elements individually. This will generate the desired SQL query as:

INSERT INTO city(code, name) VALUES ('XX1', 'Jakarta'),('XX2', 'Bandung')

By passing the array interface correctly, you can successfully execute the bulk insert operation and avoid the column count mismatch error. Remember to always check the returned error from Exec() and handle it appropriately.

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