Function batch_placeholders 

pub fn batch_placeholders(
    db_type: DatabaseType,
    columns: usize,
    rows: usize,
) -> String

Generate placeholders for a batch INSERT.

Examples

use prax_query::sql::templates;
use prax_query::sql::DatabaseType;

let placeholders = templates::batch_placeholders(DatabaseType::PostgreSQL, 3, 2);
assert_eq!(placeholders, "($1, $2, $3), ($4, $5, $6)");