How to Batch SQL Statements Efficiently Using Go's database/sql Package?

Batching SQL Statements with the Go database/sql Package

In Java, executing multiple SQL statements in a batch can be achieved through the PreparedStatement and executeBatch() method. But how can we accomplish the same using Go's database/sql package?

The database/sql package provides a Exec function that can execute SQL statements. However, it only takes a single set of arguments. To batch multiple statements, we can use a variadic function and construct a single SQL statement that includes all the individual statements to be executed.

Here's an example:

func bulkInsert(unsavedRows []*ExampleRowStruct) error {
    var (
        valueStrings []string
        valueArgs    []interface{}
    )

    for _, post := range unsavedRows {
        valueStrings = append(valueStrings, "(?, ?, ?)")
        valueArgs = append(valueArgs, post.Column1)
        valueArgs = append(valueArgs, post.Column2)
        valueArgs = append(valueArgs, post.Column3)
    }

    stmt := fmt.Sprintf(
        "INSERT INTO my_sample_table (column1, column2, column3) VALUES %s",
        strings.Join(valueStrings, ","),
    )

    _, err := db.Exec(stmt, valueArgs...)
    return err
}

This code constructs a single SQL statement that inserts all the rows into the database. By passing the individual statement arguments (values) as variadic parameters, we can execute multiple statements in a single network roundtrip. Tests have shown that this approach can be significantly faster than using the Begin, Prepare, and Commit methods for batching SQL statements.

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