paging

Documentation

Overview

Package paging contains utilities to handle pagination.

The Paging struct represents the paging information and it is automatically populated by the New function.

Index

• func ComputeOffsetAndLimit(currentPage, pageSize uint) (uint, uint)
• type Paging
  • func New(currentPage, pageSize, totalItems uint) Paging

Examples

• ComputeOffsetAndLimit
• New

Functions

func ComputeOffsetAndLimit

func ComputeOffsetAndLimit(currentPage, pageSize uint) (uint, uint)

ComputeOffsetAndLimit computes the OFFSET (zero based) and LIMIT values to be used with SQL queries.

Example

package main

import (
	"fmt"

	"github.com/Vonage/gosrvlib/pkg/paging"
)

func main() {
	var (
		currentPage uint = 3
		pageSize    uint = 5
	)

	offset, limit := paging.ComputeOffsetAndLimit(currentPage, pageSize)

	fmt.Println(offset)
	fmt.Println(limit)

}

Output:

10
5

Types

type Paging

type Paging struct {
	// CurrentPage is the current page number starting from 1.
	CurrentPage uint `json:"page"`

	// PageSize is the maximum number of items that can be contained in a page. It is also the LIMIT in SQL queries.
	PageSize uint `json:"page_size"`

	// TotalItems is the total number of items to be paginated.
	TotalItems uint `json:"total_items"`

	// TotalPages is the total number of pages required to contain all the items.
	TotalPages uint `json:"total_pages"`

	// PreviousPage is the previous page. It is equal to 1 if we are on the first page (CurrentPage == 1).
	PreviousPage uint `json:"previous_page"`

	// NextPage is the next page. It is equal to TotalPages if we are on the last page (CurrentPage == TotalPages).
	NextPage uint `json:"next_page"`

	// Offset is the zero-based number of items before the current page.
	Offset uint `json:"offset"`
}

Paging contains the paging information.

func New

func New(currentPage, pageSize, totalItems uint) Paging

New returns a new paging information instance.

Example

package main

import (
	"fmt"

	"github.com/Vonage/gosrvlib/pkg/paging"
)

func main() {
	var (
		currentPage uint = 3
		pageSize    uint = 5
		totalItems  uint = 17
	)

	// calculate new paging parameters
	p := paging.New(currentPage, pageSize, totalItems)

	fmt.Println(p)

}

Output:

{3 5 17 4 2 4 10}