105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
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package system
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import (
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"fmt"
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"go.uber.org/zap"
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"gorm.io/gorm"
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"miniapp/global"
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)
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// 分页组件
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func Page(current, size int) func(db *gorm.DB) *gorm.DB {
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return func(db *gorm.DB) *gorm.DB {
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if current == 0 {
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current = 1
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}
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if size < 1 {
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size = 10
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}
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// 计算偏移量
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offset := (current - 1) * size
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// 返回组装结果
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return db.Offset(offset).Limit(size)
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}
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}
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// @title updateSortBefore
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// @description 更新之前处理序号
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// @param tx *gorm.DB "已开启的事务对象"
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// @param model any "模型对象"
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// @return error "错误信息"
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func updateSortBefore(tx *gorm.DB, tableName, id string, sort int, param string) (err error) {
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// 查出原来的排序号
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var oldSort int
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err = tx.Table(tableName).Select("sort").Where("id = ?", id).Scan(&oldSort).Error
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if err != nil {
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global.GVA_LOG.Error("查询老数据失败: %v", zap.Error(err))
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return
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}
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// 如果相等，啥都不干
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if oldSort == sort {
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return nil
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}
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// 处理排序
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// 如果老的排序号小于新的，(老, 新]之间的排序号都要-1
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// 如果老的大于新的，[老, 新)排序号-1
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if oldSort < sort {
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// 老的小于新的，[老, 新) + 1
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sel := tx.Table(tableName).
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Where("sort <= ? AND sort > ?", sort, oldSort).
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Where("deleted_at IS NULL")
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if param != "" {
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sel.Where(param) // 自定义条件
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}
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err = sel.Update("sort", gorm.Expr("sort - 1")).Error
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} else {
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// 老的大于新的，[新, 老) + 1
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sel := tx.Table(tableName).
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Where("sort >= ? AND sort < ?", sort, oldSort).
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Where("deleted_at IS NULL")
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if param != "" {
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sel.Where(param) // 自定义条件
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}
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err = sel.Update("sort", gorm.Expr("sort + 1")).Error
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}
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return
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}
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// @title createSortBefore
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// @description 新建之前处理序号
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// @param tx *gorm.DB "已开启的事务对象"
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// @param model any "模型对象"
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// @return error "错误信息"
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func createSortBefore(tx *gorm.DB, tableName string, sort int, param string) (err error) {
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// 处理排序,如果没有传，就会是在最前面
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sel := tx.Table(tableName).Where("sort >= ?", sort).
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Where("deleted_at IS NULL")
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if param != "" {
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sel.Where(param)
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}
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err = sel.Update("sort", gorm.Expr("sort + 1")).Error
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if err != nil {
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global.GVA_LOG.Error("处理前置排序失败：%v", zap.Error(err))
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}
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return
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}
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// @title dealSortAfter
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// @description 处理序号之后
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// @param tx *gorm.DB "已开启的事务对象"
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// @param modelName string "表名"
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// @return error "错误信息"
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func dealSortAfter(tx *gorm.DB, modelName, param string) (err error) {
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// 保存成功，刷新排序
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if param != "" {
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param += " AND "
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}
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sql := fmt.Sprintf("UPDATE %s a, (SELECT (@i := @i + 1) i, id FROM %s WHERE %s deleted_at IS NULL order by sort ASC) i, "+
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"(SELECT @i := 0) ir SET a.sort = i.i, updated_at=now() WHERE a.id = i.id", modelName, modelName, param)
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err = tx.Exec(sql).Error
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if err != nil {
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global.GVA_LOG.Error("刷新排序失败: %v", zap.Error(err))
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}
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return
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}
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