How to Fix Gorm\'s Column Count Mismatch Error During Bulk Inserts?

Resolving Column Count Mismatch in Gorm Array Interface

When attempting to execute a bulk insert using Gorm's Exec method with an array interface, an error may occur indicating a column count mismatch. This error arises when the provided values do not match the number of columns defined in the SQL query.

To resolve this issue, ensure that the values passed to the Exec method are spread out using the ... operator. This tells the compiler to treat the slice elements as individual arguments rather than passing the entire slice as a single value.

The updated code below demonstrates the correct usage of the ... operator:

tx := dB.GetWriteDB().Begin()
sqlStr := "INSERT INTO city(code, name) VALUES (?, ?),(?, ?)"
vals := []interface{}{}

vals = append(vals, "XX1", "Jakarta")
vals = append(vals, "XX2", "Bandung")

tx.Exec(sqlStr, vals...)

tx.Commit()

if err := tx.Error(); err != nil {
    // handle error
}

By using the ... operator, the values in the vals slice are expanded into individual arguments, which are then correctly assigned to the corresponding columns in the SQL statement. This eliminates the column count mismatch and allows for a successful bulk insert.

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