public class Main {
    public static void main(String[] args) {
        String[] fields = { "name", "position", "salary" };
        String table = "employee";
        String insert = buildInsertSql(table, fields);
        System.out.println(insert);
        String s = "INSERT INTO employee (name, position, salary) VALUES (?, ?, ?)";
        System.out.println(s.equals(insert) ? "测试成功" : "测试失败");
    }

    static String buildInsertSql(String table, String[] fields) {
        StringBuilder sql = new StringBuilder(1024);
        sql.append("INSERT INTO ")
                .append(table)
                .append(" (");
        for (int i = 0, len = fields.length; i < len; i++) {
            sql.append(fields[i]);
            if (i < len - 1) {
                sql.append(", ");
            }
        }
        sql.append(") ").append("VALUES (?, ?, ?)");
        return sql.toString();
    }
}