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pagination.go
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pagination.go
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// 分页计算相关封装
package goutils
import "math"
// Pagination Paginate return it
// 异常数据时分页总数为 0 ,当前页码、上下页码均不判断逻辑,只管数值增减
type Pagination struct {
// 数据总数
TotalCount int `json:"total_count"`
// 分页总数
PagesCount int `json:"pages_count"`
// 当前页码
PageNum int `json:"page_num"`
// 上一页页码
PrevPageNum int `json:"prev_page_num"`
// 下一页页码
NextPageNum int `json:"next_page_num"`
// 分页大小
PageSize int `json:"page_size"`
// 是否有上一页
HasPrev bool `json:"has_prev"`
// 是否有下一页
HasNext bool `json:"has_next"`
}
// PaginateByPageNumSize 按 pagenum,pagesize 计算分页信息
// 参数必须全部大于 0
func PaginateByPageNumSize(totalCount, pageNum, pageSize int) Pagination {
if totalCount < 0 {
totalCount = 0
}
if pageNum <= 0 {
pageNum = 1
}
if pageSize <= 0 {
pageSize = 10
}
pagesCount := int(math.Ceil(float64(totalCount) / float64(pageSize)))
nextPageNum := pageNum + 1
hasNext := nextPageNum <= pagesCount
prevPageNum := pageNum - 1
hasPrev := prevPageNum > 0
return Pagination{
TotalCount: totalCount,
PagesCount: pagesCount,
PageNum: pageNum,
PrevPageNum: prevPageNum,
NextPageNum: nextPageNum,
PageSize: pageSize,
HasPrev: hasPrev,
HasNext: hasNext,
}
}
// PaginateByOffsetLimit 按 offset,limit 计算分页信息
func PaginateByOffsetLimit(totalCount, offset, limit int) Pagination {
pageNum := offset/limit + 1
pageSize := limit
return PaginateByPageNumSize(totalCount, pageNum, pageSize)
}