golang實現分頁演算法
摘要：
//分頁方法，根據傳遞過來的頁數，每頁數，總數，返回分頁的內容 7個頁數 前 1，2，3，4，5 後 的格式返回,小於5頁返回具體頁數
func Paginator(page, prepage int, nums int64) map[string]interface{} {
var fi...
//分頁方法，根據傳遞過來的頁數，每頁數，總數，返回分頁的內容 7個頁數 前 1，2，3，4，5 後 的格式返回,小於5頁返回具體頁數
func Paginator(page, prepage int, nums int64) map[string]interface{} {
var firstpage int //前一頁地址
var lastpage int//後一頁地址
//根據nums總數，和prepage每頁數量 生成分頁總數
totalpages := int(math.Ceil(float64(nums) / float64(prepage))) //page總數
if page > totalpages {
page = totalpages
}
if page <= 0 {
page = 1
}
var pages []int
switch {
case page >= totalpages-5 && totalpages > 5: //最後5頁
start := totalpages - 5 + 1
firstpage = page - 1
lastpage = int(math.Min(float64(totalpages), float64(page+1)))
pages = make([]int, 5)
for i, _ := range pages {
pages[i] = start + i
}
case page >= 3 && totalpages > 5:
start := page - 3 + 1
pages = make([]int, 5)
firstpage = page - 3
for i, _ := range pages {
pages[i] = start + i
}
firstpage = page - 1
lastpage = page + 1
default:
pages = make([]int, int(math.Min(5, float64(totalpages))))
for i, _ := range pages {
pages[i] = i + 1
}
firstpage = int(math.Max(float64(1), float64(page-1)))
lastpage = page + 1
//fmt.Println(pages)
}
paginatorMap := make(map[string]interface{})
paginatorMap["pages"] = pages
paginatorMap["totalpages"] = totalpages
paginatorMap["firstpage"] = firstpage
paginatorMap["lastpage"] = lastpage
paginatorMap["currpage"] = page
return paginatorMap
}
測試結果如下
func main(){
pageSize := 3
var rsCount int64 = 100
currentPage := 8
res := Paginator(currentPage,pageSize,rsCount)
fmt.Println(res)
}
執行結果如下
map[pages:[6 7 8 9 10] totalpages:34 firstpage:7 lastpage:9 currpage:8]