76 lines
1.4 KiB
Go
76 lines
1.4 KiB
Go
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package repository
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import (
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"errors"
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"gorm.io/gorm"
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)
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// IsNotFound 检查是否为记录未找到错误
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func IsNotFound(err error) bool {
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return errors.Is(err, gorm.ErrRecordNotFound)
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}
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// HandleNotFound 处理记录未找到的情况，未找到时返回 nil, nil
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func HandleNotFound[T any](result *T, err error) (*T, error) {
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if err != nil {
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if IsNotFound(err) {
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return nil, nil
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}
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return nil, err
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}
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return result, nil
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}
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// Paginate 创建分页查询
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func Paginate(page, pageSize int) func(db *gorm.DB) *gorm.DB {
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return func(db *gorm.DB) *gorm.DB {
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if page < 1 {
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page = 1
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}
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if pageSize < 1 {
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pageSize = 20
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}
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if pageSize > 100 {
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pageSize = 100
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}
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offset := (page - 1) * pageSize
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return db.Offset(offset).Limit(pageSize)
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}
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}
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// PaginatedQuery 执行分页查询，返回列表和总数
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func PaginatedQuery[T any](
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baseQuery *gorm.DB,
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page, pageSize int,
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orderBy string,
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preloads ...string,
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) ([]T, int64, error) {
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var items []T
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var total int64
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// 获取总数
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if err := baseQuery.Count(&total).Error; err != nil {
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return nil, 0, err
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}
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// 分页查询
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query := baseQuery.Scopes(Paginate(page, pageSize))
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// 添加排序
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if orderBy != "" {
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query = query.Order(orderBy)
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}
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// 添加预加载
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for _, preload := range preloads {
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query = query.Preload(preload)
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}
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if err := query.Find(&items).Error; err != nil {
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return nil, 0, err
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}
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return items, total, nil
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}
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