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| 1 | + |
| 2 | +//When Jesus therefore had received the vinegar, he said, "It is finished." He bowed his head, and gave up his spirit. (John 19:30) |
| 3 | + |
| 4 | +package com.javarush.task.task22.task2208; |
| 5 | + |
| 6 | +import java.util.Map; |
| 7 | +import java.util.LinkedHashMap; |
| 8 | + |
| 9 | +/* |
| 10 | +Формируем WHERE |
| 11 | +*/ |
| 12 | +public class Solution { |
| 13 | + public static void main(String[] args) { |
| 14 | + Map<String, String> map = new LinkedHashMap<>(); |
| 15 | + map.put("name","Ivanov"); |
| 16 | + map.put("country","Ukraine"); |
| 17 | + map.put("city","Kiev"); |
| 18 | + map.put("age",null); |
| 19 | + map.put("name1","Ivanov"); |
| 20 | + map.put("name2","Ivanov"); |
| 21 | + |
| 22 | + System.out.println(getQuery(map)); |
| 23 | + } |
| 24 | + |
| 25 | + public static String getQuery(Map<String, String> params) { |
| 26 | + StringBuilder result = new StringBuilder(); |
| 27 | + if (params == null || params.isEmpty()) |
| 28 | + return result.toString(); |
| 29 | + |
| 30 | + for (Map.Entry<String, String> pair : params.entrySet()) { |
| 31 | + if (pair.getKey() == null || pair.getValue() == null) |
| 32 | + continue; |
| 33 | + |
| 34 | + result.append(pair.getKey()).append(" = '").append(pair.getValue()).append("' and "); |
| 35 | + } |
| 36 | + |
| 37 | + if (result.length() > 5) |
| 38 | + result.delete(result.length() - 5, result.length()); |
| 39 | + |
| 40 | + return result.toString(); |
| 41 | + } |
| 42 | +} |
| 43 | +/* |
| 44 | +Формируем WHERE |
| 45 | +Сформируй часть запроса WHERE используя StringBuilder. |
| 46 | +Если значение null, то параметр не должен попадать в запрос. |
| 47 | +
|
| 48 | +Пример: |
| 49 | +{"name", "Ivanov", "country", "Ukraine", "city", "Kiev", "age", null} |
| 50 | +
|
| 51 | +Результат: |
| 52 | +"name = 'Ivanov' and country = 'Ukraine' and city = 'Kiev'" |
| 53 | +
|
| 54 | +
|
| 55 | +Требования: |
| 56 | +1. Метод getQuery должен принимать один параметр типа Map. |
| 57 | +2. Метод getQuery должен иметь тип возвращаемого значения String. |
| 58 | +3. Метод getQuery должен быть статическим. |
| 59 | +4. Метод getQuery должен возвращать строку сформированную по правилам описанным в условии задачи. |
| 60 | +*/ |
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