89 lines
1.5 KiB
Go
89 lines
1.5 KiB
Go
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package database
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import (
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"database/sql"
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"database/sql/driver"
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"encoding/json"
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"fmt"
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"gorm.io/gorm"
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"reflect"
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)
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type NullTime sql.NullTime
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func (n *NullTime) Scan(value any) error {
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return (*sql.NullTime)(n).Scan(value)
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}
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func (n NullTime) Value() (driver.Value, error) {
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if !n.Valid {
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return nil, nil
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}
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return n.Time, nil
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}
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func (n NullTime) MarshalJSON() ([]byte, error) {
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if n.Valid {
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return json.Marshal(n.Time)
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}
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return json.Marshal(nil)
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}
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func (n *NullTime) UnmarshalJSON(b []byte) error {
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if string(b) == "null" {
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n.Valid = false
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return nil
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}
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err := json.Unmarshal(b, &n.Time)
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if err == nil {
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n.Valid = true
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}
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return err
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}
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/*-----------------------------------------------------------*/
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type PaginateList struct {
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Page int64 `json:"page"`
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Size int64 `json:"size"`
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Total int64 `json:"total"`
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List any `json:"list"`
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}
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func Paginate(db *gorm.DB, model any, page, size int64) (*PaginateList, error) {
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ptr := reflect.ValueOf(model)
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if ptr.Kind() != reflect.Ptr {
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return nil, fmt.Errorf("model must be pointer")
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}
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var total int64
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err := db.Model(model).Count(&total).Error
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if err != nil {
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return &PaginateList{
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Page: page,
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Size: size,
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Total: total,
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List: make([]any, 0),
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}, err
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}
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offset := size * (page - 1)
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err = db.Limit(int(size)).Offset(int(offset)).Find(model).Error
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if err != nil {
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return &PaginateList{
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Page: page,
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Size: size,
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Total: total,
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List: make([]any, 0),
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}, err
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}
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return &PaginateList{
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Page: page,
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Size: size,
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Total: total,
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List: model,
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}, nil
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}
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