How to Correctly Use Variadic Parameters with Gorm\'s `Exec` for Bulk Inserts in Go?

Using Variadic Parameters to Join Array Interface in Golang

In your attempt to execute bulk inserts using Gorm, you encountered an error due to a mismatch between the column count and the values provided. This issue stems from the incorrect formatting of your query when using an array interface.

Solution:

To resolve this, you need to use the "..." operator when passing elements of the slice to the function with variadic parameters. This will instruct the compiler to pass each element individually instead of passing the slice value as a single argument.

tx.Exec(sqlStr, vals...)

Explanation:

The Tx.Exec() function has the signature func (tx *Tx) Exec(query string, args ...interface{}) (Result, error). This means that you can pass a variable number of arguments as the second parameter, designated as args. By using the "..." operator, you're telling the compiler to expand the vals slice into individual arguments.

This will result in the following query being executed:

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

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