PostgreSQL and Hibernate java.io.IOException: Tried to send an out-of-range integer as a 2-byte value
目录
1.报错原因
2.对入参为大数据量list的解决方法
1.报错原因
对postgresql来说，sql查询语句中的入参容量大小超出允许的最大范围(32767)（有的数据库引擎对sql长度也有限制）2.对入参为大数据量list的解决方法
java8 Stream流处理//按每3个一组分割private static final Integer MAX_NUMBER = 3;/*** 计算切分次数*/private static Integer countStep(Integer size) {return (size + MAX_NUMBER - 1) / MAX_NUMBER;}public static void main(String[] args) {List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7);int limit = countStep(list.size());//方法一：使用流遍历操作List<List<Integer>> mglist = new ArrayList<>();Stream.iterate(0, n -> n + 1).limit(limit).forEach(i -> {mglist.add(list.stream().skip(i * MAX_NUMBER).limit(MAX_NUMBER).collect(Collectors.toList()));});System.out.println(mglist);//方法二：获取分割后的集合List<List<Integer>> splitList = Stream.iterate(0, n -> n + 1).limit(limit).parallel().map(a -> list.stream().skip(a * MAX_NUMBER).limit(MAX_NUMBER).parallel().collect(Collectors.toList())).collect(Collectors.toList());System.out.println(splitList);}
