152 lines
3.8 KiB
Go
152 lines
3.8 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package db
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import (
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"context"
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"code.gitea.io/gitea/modules/setting"
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"xorm.io/builder"
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"xorm.io/xorm"
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)
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const (
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// DefaultMaxInSize represents default variables number on IN () in SQL
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DefaultMaxInSize = 50
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)
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// Paginator is the base for different ListOptions types
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type Paginator interface {
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GetSkipTake() (skip, take int)
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GetStartEnd() (start, end int)
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IsListAll() bool
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}
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// GetPaginatedSession creates a paginated database session
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func GetPaginatedSession(p Paginator) *xorm.Session {
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skip, take := p.GetSkipTake()
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return x.Limit(take, skip)
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}
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// SetSessionPagination sets pagination for a database session
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func SetSessionPagination(sess Engine, p Paginator) *xorm.Session {
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skip, take := p.GetSkipTake()
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return sess.Limit(take, skip)
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}
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// SetEnginePagination sets pagination for a database engine
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func SetEnginePagination(e Engine, p Paginator) Engine {
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skip, take := p.GetSkipTake()
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return e.Limit(take, skip)
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}
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// ListOptions options to paginate results
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type ListOptions struct {
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PageSize int
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Page int // start from 1
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ListAll bool // if true, then PageSize and Page will not be taken
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}
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var _ Paginator = &ListOptions{}
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// GetSkipTake returns the skip and take values
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func (opts *ListOptions) GetSkipTake() (skip, take int) {
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opts.SetDefaultValues()
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return (opts.Page - 1) * opts.PageSize, opts.PageSize
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}
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// GetStartEnd returns the start and end of the ListOptions
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func (opts *ListOptions) GetStartEnd() (start, end int) {
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start, take := opts.GetSkipTake()
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end = start + take
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return start, end
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}
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// IsListAll indicates PageSize and Page will be ignored
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func (opts *ListOptions) IsListAll() bool {
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return opts.ListAll
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}
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// SetDefaultValues sets default values
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func (opts *ListOptions) SetDefaultValues() {
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if opts.PageSize <= 0 {
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opts.PageSize = setting.API.DefaultPagingNum
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}
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if opts.PageSize > setting.API.MaxResponseItems {
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opts.PageSize = setting.API.MaxResponseItems
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}
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if opts.Page <= 0 {
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opts.Page = 1
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}
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}
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// AbsoluteListOptions absolute options to paginate results
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type AbsoluteListOptions struct {
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skip int
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take int
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}
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var _ Paginator = &AbsoluteListOptions{}
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// NewAbsoluteListOptions creates a list option with applied limits
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func NewAbsoluteListOptions(skip, take int) *AbsoluteListOptions {
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if skip < 0 {
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skip = 0
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}
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if take <= 0 {
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take = setting.API.DefaultPagingNum
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}
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if take > setting.API.MaxResponseItems {
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take = setting.API.MaxResponseItems
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}
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return &AbsoluteListOptions{skip, take}
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}
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// IsListAll will always return false
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func (opts *AbsoluteListOptions) IsListAll() bool {
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return false
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}
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// GetSkipTake returns the skip and take values
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func (opts *AbsoluteListOptions) GetSkipTake() (skip, take int) {
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return opts.skip, opts.take
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}
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// GetStartEnd returns the start and end values
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func (opts *AbsoluteListOptions) GetStartEnd() (start, end int) {
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return opts.skip, opts.skip + opts.take
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}
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// FindOptions represents a find options
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type FindOptions interface {
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Paginator
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ToConds() builder.Cond
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}
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// Find represents a common find function which accept an options interface
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func Find[T any](ctx context.Context, opts FindOptions, objects *[]T) error {
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sess := GetEngine(ctx).Where(opts.ToConds())
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if !opts.IsListAll() {
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sess.Limit(opts.GetSkipTake())
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}
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return sess.Find(objects)
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}
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// Count represents a common count function which accept an options interface
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func Count[T any](ctx context.Context, opts FindOptions, object T) (int64, error) {
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return GetEngine(ctx).Where(opts.ToConds()).Count(object)
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}
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// FindAndCount represents a common findandcount function which accept an options interface
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func FindAndCount[T any](ctx context.Context, opts FindOptions, objects *[]T) (int64, error) {
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sess := GetEngine(ctx).Where(opts.ToConds())
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if !opts.IsListAll() {
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sess.Limit(opts.GetSkipTake())
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}
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return sess.FindAndCount(objects)
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}
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