要根据人名进行后台分页查询,可以按照以下步骤进行:

  1. 首先,需要定义一个数据模型来表示每个人的信息,包括人名和其他相关属性。例如:
public class Person {
    private String name;
    // other properties
    
    // getters and setters
}
  1. 在后台查询方法中,接收一个参数 pageSize 表示每页显示的数据条数,以及一个参数 pageNumber 表示当前页数。
public List<Person> getPeopleByPage(int pageSize, int pageNumber) {
    // implement the logic to query people by page
}
  1. 在查询方法中,根据人名进行分组查询,并使用分页查询语句来限制每页的数据条数。
public List<Person> getPeopleByPage(int pageSize, int pageNumber) {
    // Group people by name and count the total number of people
    Map<String, Long> peopleCountByName = people.stream()
            .collect(Collectors.groupingBy(Person::getName, Collectors.counting()));
    
    // Get the distinct names
    List<String> distinctNames = new ArrayList<>(peopleCountByName.keySet());
    
    // Calculate the total number of pages based on the distinct names
    int totalPage = (int) Math.ceil((double) distinctNames.size() / pageSize);
    
    // Calculate the start index of the current page
    int startIndex = (pageNumber - 1) * pageSize;
    
    // Calculate the end index of the current page
    int endIndex = Math.min(startIndex + pageSize, distinctNames.size());
    
    // Get the names for the current page
    List<String> namesForPage = distinctNames.subList(startIndex, endIndex);
    
    // Query people for the current page based on the names
    List<Person> peopleForPage = people.stream()
            .filter(person -> namesForPage.contains(person.getName()))
            .collect(Collectors.toList());
    
    // Return the list of people for the current page
    return peopleForPage;
}
  1. 在返回结果中,除了每页的人员信息,还需要返回总页数和总人数。
public PageResult getPeopleByPage(int pageSize, int pageNumber) {
    List<Person> peopleForPage = getPeopleByPage(pageSize, pageNumber);
    int totalPage = calculateTotalPage(pageSize);
    int totalPeople = calculateTotalPeople();
    
    return new PageResult(peopleForPage, totalPage, totalPeople);
}

其中,PageResult 类可以定义如下:

public class PageResult {
    private List<Person> people;
    private int totalPage;
    private int totalPeople;
    
    // constructor, getters and setters
}

通过以上步骤,就可以根据人名进行后台分页查询,每页查询不同人的作为一页查询,并根据人数决定总数。

Java 后台分页查询:根据人名实现分页功能

原文地址: https://www.cveoy.top/t/topic/p94a 著作权归作者所有。请勿转载和采集!

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