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59 lines (56 loc) · 1.96 KB
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package com.javarush.test.level22.lesson09.task02;
import java.util.HashMap;
import java.util.Map;
/* Формируем Where
Сформируйте часть запроса WHERE используя StringBuilder.
Если значение null, то параметр не должен попадать в запрос.
Пример:
{"name", "Ivanov", "country", "Ukraine", "city", "Kiev", "age", null}
Результат:
"name = 'Ivanov' and country = 'Ukraine' and city = 'Kiev'"
*/
public class Solution {
public static void main(String[] args)
{
Map<String, String> params = new HashMap<>();
params.put("name", "Ivanov");
params.put("country", "Ukraine");
params.put("city", "Kiev");
params.put("age", null);
System.out.println(getCondition(params));
}
public static StringBuilder getCondition(Map<String, String> params) {
StringBuilder sb = new StringBuilder();
for (Map.Entry<String,String> pair : params.entrySet()){
if (pair.getValue() != null)
{
if (sb.length() != 0)
{
if (sb.charAt(sb.length()-1) == '\'')
{
sb.append(" and ");
sb.append(pair.getKey());
sb.append(" = '");
sb.append(pair.getValue());
sb.append("'");
}
else
{
sb.append(pair.getKey());
sb.append(" = '");
sb.append(pair.getValue());
sb.append("'");
}
}
else
{
sb.append(pair.getKey());
sb.append(" = '");
sb.append(pair.getValue());
sb.append("'");
}
}
}
return sb;
}
}