package com.itranswarp.learnjava;

import java.util.StringJoiner;

public class Main {

	public static void main(String[] args) {
		String[] fields = { "name", "position", "salary" };
		String table = "employee";
		String select = buildSelectSql(table, fields);
		System.out.println(select);
		System.out.println("SELECT name, position, salary FROM employee".equals(select) ? "测试成功" : "测试失败");
	}

	static String buildSelectSql(String table, String[] fields) {
		// TODO:
		var sb = new StringBuilder();
		sb.append(" FROM ")
		.append(table);
		String end = sb.toString();
		
		var sj = new StringJoiner(", ", "SELECT ", end);
		for (String field : fields) {
			sj.add(field);
		}
		return sj.toString();
		
//		var sb = new StringBuilder(1024);
//		sb.append("SELECT ")
//		.append(String.join(", ", fields))
//		.append(" FROM ")
//		.append(table);
//		return sb.toString();
	}

}