go语言制作分页器实例探究

目录

• Install
• Usage
• Get & Render method
• Adapters
• GORM Adapter
• XORM Adapter
• Slice adapter

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)
    //获取最后页码
    page, err := myPage.GetLastPage()
    fmt.Println(fmt.Sprintf("获取最后页码:%v", page))
    fmt.Println(fmt.Sprintf("获取最后页码错误信息:%v", err))
    //获取总数
    total, err := myPage.GetTotal()
    fmt.Println(fmt.Sprintf("获取总数:%v", total))
    fmt.Println(fmt.Sprintf("获取总数错误信息:%v", err))
    fmt.Println(fmt.Sprintf("当前页码:%v", myPage.GetCurrentPage()))
    fmt.Println(fmt.Sprintf("每页显示多少条数:%v", myPage.GetListRows()))
    fmt.Println(fmt.Sprintf("是否还可以进行分页:%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 destICxaPhgundex []PostIndex
    for i, post := range dest {
        destIndex = append(destIndex, PostIndex{ID: post.ID, Number: post.Number, Index: i})
    }
    // 先执行当get方法此时为nil data数据为dest
    // 不执行get方法 此时传入dest，data就是dest编程
    // 执行get方法 此时在传入新的结构体 data 就是data
    // 不执行get 此时传入nil 就返回nil
    r := myPage.Render(nil)
    jsonBytes, _ := json.Marshal(r)编程客栈
    xmlBytes, err := xml.Marshal(r)
    fmt.Println(string(jsonBytes))
    fmt.Println(string(xmlBytes))
    //获取最后页码
    page, err := myPage.GetLastPage()
    fmt.Println(fmt.Sprintf("获取最后页码:%v", page))
    fmt.Println(fmt.Sprintf("获取最后页码错误信息:%v", err))
    //获取总数
    total, err := myPage.GetTotal()
    fmt.Println(fmt.Sprintf("获取总数:%v", total))
    fmt.Println(fmt.Sprintf("获取总数错误信息:%v", err))
    fmt.Println(fmt.Spr编程客栈intf("当前页码:%v", myPage.GetCurrentPage()))
    fmt.Println(fmt.Sprintf("每页显示多少条数:%v", myPage.GetListRows()))
    fmt.Println(fmt.Sprintf("是否还可以进行分页:%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	Getjs method executed

Adapters

适配器必须实现具有两种方法的“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)

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