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go語言制作分頁器實(shí)例探究

更新時(shí)間：2024年01月04日 14:25:59 作者：pkg6

這篇文章主要為大家介紹了go語言制作分頁器實(shí)例探究,有需要的朋友可以借鑒參考下,希望能夠有所幫助,祝大家多多進(jìn)步,早日升職加薪

Install

$ go get github.com/pkg6/go-paginate

Usage

package main
import (
    "encoding/json"
    "encoding/xml"
    "fmt"
    "github.com/pkg6/go-paginate"
    "github.com/pkg6/go-paginate/gormp"
    "gorm.io/driver/sqlite"
    "gorm.io/gorm"
    "gorm.io/gorm/logger"
)
type Post struct {
    ID     uint `gormp:"primarykey" json:"id"`
    Number int  `json:"number"`
}
type PostIndex struct {
    ID     uint `gormp:"primarykey" json:"id"`
    Number int  `json:"number"`
    Index  int  `json:"index"`
}
var db, _ = gorm.Open(sqlite.Open("gormp.db?cache=shared"), &gorm.Config{
    Logger: logger.Default.LogMode(logger.Info),
})
func init() {
    _ = db.AutoMigrate(&Post{})
    for i := 1; i <= 100; i++ {
        p := Post{
            Number: i,
        }
        db.Save(&p)
    }
}
func simple() {
    q := db.Model(Post{})
    var dest []Post
    var adapt = gormp.Adapter(q)
    myPage := paginate.SimplePaginate(adapt, 10, 1)
    _ = myPage.Get(&dest)
    //獲取最后頁碼
    page, err := myPage.GetLastPage()
    fmt.Println(fmt.Sprintf("獲取最后頁碼:%v", page))
    fmt.Println(fmt.Sprintf("獲取最后頁碼錯(cuò)誤信息:%v", err))
    //獲取總數(shù)
    total, err := myPage.GetTotal()
    fmt.Println(fmt.Sprintf("獲取總數(shù):%v", total))
    fmt.Println(fmt.Sprintf("獲取總數(shù)錯(cuò)誤信息:%v", err))
    fmt.Println(fmt.Sprintf("當(dāng)前頁碼:%v", myPage.GetCurrentPage()))
    fmt.Println(fmt.Sprintf("每頁顯示多少條數(shù):%v", myPage.GetListRows()))
    fmt.Println(fmt.Sprintf("是否還可以進(jìn)行分頁:%v", myPage.HasPages()))
    fmt.Println(dest)
}
func Total() {
    q := db.Model(Post{}).Where([]int64{20, 21, 22}).Order("id desc")
    var dest []Post
    var adapt = gormp.Adapter(q)
    t, _ := adapt.Length()
    myPage := paginate.TotalPaginate(adapt, 10, 1, t)
    _ = myPage.Get(&dest)
    var destIndex []PostIndex
    for i, post := range dest {
        destIndex = append(destIndex, PostIndex{ID: post.ID, Number: post.Number, Index: i})
    }
    // 先執(zhí)行當(dāng)get方法此時(shí)為nil data數(shù)據(jù)為dest
    // 不執(zhí)行g(shù)et方法 此時(shí)傳入dest，data就是dest
    // 執(zhí)行g(shù)et方法 此時(shí)在傳入新的結(jié)構(gòu)體 data 就是data
    // 不執(zhí)行g(shù)et 此時(shí)傳入nil 就返回nil
    r := myPage.Render(nil)
    jsonBytes, _ := json.Marshal(r)
    xmlBytes, err := xml.Marshal(r)
    fmt.Println(string(jsonBytes))
    fmt.Println(string(xmlBytes))
    //獲取最后頁碼
    page, err := myPage.GetLastPage()
    fmt.Println(fmt.Sprintf("獲取最后頁碼:%v", page))
    fmt.Println(fmt.Sprintf("獲取最后頁碼錯(cuò)誤信息:%v", err))
    //獲取總數(shù)
    total, err := myPage.GetTotal()
    fmt.Println(fmt.Sprintf("獲取總數(shù):%v", total))
    fmt.Println(fmt.Sprintf("獲取總數(shù)錯(cuò)誤信息:%v", err))
    fmt.Println(fmt.Sprintf("當(dāng)前頁碼:%v", myPage.GetCurrentPage()))
    fmt.Println(fmt.Sprintf("每頁顯示多少條數(shù):%v", myPage.GetListRows()))
    fmt.Println(fmt.Sprintf("是否還可以進(jìn)行分頁:%v", myPage.HasPages()))
    fmt.Println(dest)
}
func main() {
    Total()
    simple()
}

Get & Render method

Get	Render	data
Execute mandatory&data data	nil	&data
Execute mandatory&data data	Transfer data	Transfer data
Do not execute	nil	null
Do not execute	Transfer data	Get method executed

Adapters

適配器必須實(shí)現(xiàn)具有兩種方法的“adapter”接口：

Length() (int64, error)
Slice(offset, length int64, dest any) error

GORM Adapter

var db, _ = gorm.Open(sqlite.Open("gorm.db?cache=shared"), &gorm.Config{
    Logger: logger.Default.LogMode(logger.Info),
})
q := db.Model(Post{}).Where([]int64{20, 21, 22}).Order("id desc")
var dest []Post
var adapt = gromp.Adapter(q)
t, _ := adapt.Length()
myPage := paginate.TotalPaginate(adapt, 10, 1, t)

XORM Adapter

var engine, _ = xorm.NewEngine("sqlite3", "xorm.db")
session := engine.Table(Post{})
var dest []Post
var adapt = xormp.Adapter(session)
total, _ := adapt.Length()
myPage := paginate.TotalPaginate(adapt, 10, 1, total)

Slice adapter

var source = []int{
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    11, 22, 33, 44, 55, 66, 77, 88, 99, 199,
    111, 222, 333, 444, 555, 666, 777, 888, 999, 199,
    1111, 2222,
}
var adapt = slicep.Adapter(source)
myPage := paginate.SimplePaginate(adapt, 10, 5)

以上就是go語言制作分頁器實(shí)例探究的詳細(xì)內(nèi)容，更多關(guān)于go語言實(shí)現(xiàn)分頁器的資料請(qǐng)關(guān)注腳本之家其它相關(guān)文章！

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