feat: 迁移 Admin Repository 到 MySQL 8 (#79)

admin/repository/client.go

@@ -55,14 +55,14 @@ func UpsertClient(q Execer, c model.Client, explicit bool) error {
 		                     pdd_package, capabilities,
 		                     last_seen_at, created_at, updated_at)
 		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
-		ON CONFLICT(client_id) DO UPDATE SET
+		ON DUPLICATE KEY UPDATE
 		    name           = CASE WHEN ? THEN ? ELSE clients.name END,
-		    device_address = excluded.device_address,
-		    platform       = excluded.platform,
-		    pdd_package    = excluded.pdd_package,
-		    capabilities   = excluded.capabilities,
-		    last_seen_at   = excluded.last_seen_at,
-		    updated_at     = excluded.updated_at`,
+		    device_address = VALUES(device_address),
+		    platform       = VALUES(platform),
+		    pdd_package    = VALUES(pdd_package),
+		    capabilities   = VALUES(capabilities),
+		    last_seen_at   = VALUES(last_seen_at),
+		    updated_at     = VALUES(updated_at)`,
 		c.ClientID, insertName, c.DeviceAddress, c.Platform,
 		c.PddPackage, c.Capabilities, now, now, now,
 		updateName, name)
@@ -155,8 +155,11 @@ func listClientsForUserPage(db *sql.DB, keyword, visibleUserID string, limit, of
 	query := `SELECT c.client_id, c.name, c.device_address, c.platform, c.pdd_package,
 	                 c.capabilities, c.last_seen_at, c.created_at, c.updated_at,
 	                 a.user_id, u.username` + clientListFrom + where +
-		` ORDER BY c.last_seen_at DESC, c.client_id LIMIT ? OFFSET ?`
-	args = append(args, limit, offset)
+		` ORDER BY c.last_seen_at DESC, c.client_id`
+	if limit >= 0 {
+		query += ` LIMIT ? OFFSET ?`
+		args = append(args, limit, offset)
+	}
 
 	rows, err := db.Query(query, args...)
 	if err != nil {
@@ -216,16 +219,16 @@ func ListClientsForUserPage(db *sql.DB, keyword, visibleUserID string, limit, of
 }
 
 // CountOnlineClientsForUser 统计同一筛选和权限范围内的在线客户端。
-// julianday 解析失败会得到 NULL，自然按离线处理，与 model.Client.IsOnline 一致。
+// last_seen_at 统一以 UTC RFC3339 保存，固定宽度字符串的字典序就是时间顺序。
 func CountOnlineClientsForUser(db *sql.DB, keyword, visibleUserID, cutoffISO string) (int, error) {
 	where, args := clientListFilter(keyword, visibleUserID)
 	args = append(args, cutoffISO)
 	var online int
 	query := `SELECT COUNT(*)` + clientListFrom + where
 	if where == "" {
-		query += ` WHERE julianday(c.last_seen_at) > julianday(?)`
+		query += ` WHERE c.last_seen_at > ?`
 	} else {
-		query += ` AND julianday(c.last_seen_at) > julianday(?)`
+		query += ` AND c.last_seen_at > ?`
 	}
 	if err := db.QueryRow(query, args...).Scan(&online); err != nil {
 		return 0, fmt.Errorf("统计在线客户端失败: %w", err)
@@ -262,13 +265,13 @@ func AssignClient(db *sql.DB, assignment model.ClientUserAssignment) (bool, bool
 		return false, false, fmt.Errorf("开始绑定客户端事务失败: %w", err)
 	}
 	defer tx.Rollback()
-	var exists int
-	if err := tx.QueryRow(`SELECT COUNT(*) FROM clients WHERE client_id = ?`, assignment.ClientID).Scan(&exists); err != nil {
+	var lockedClientID string
+	if err := tx.QueryRow(`SELECT client_id FROM clients WHERE client_id = ? FOR UPDATE`, assignment.ClientID).Scan(&lockedClientID); errors.Is(err, sql.ErrNoRows) {
+		return false, false, ErrClientNotFound
+	} else if err != nil {
 		return false, false, fmt.Errorf("检查客户端失败: %w", err)
 	}
-	if exists == 0 {
-		return false, false, ErrClientNotFound
-	}
+	var exists int
 	if err := tx.QueryRow(`SELECT COUNT(*) FROM users WHERE user_id = ? AND role = ? AND status = ?`,
 		assignment.UserID, model.RolePurchaser, model.UserActive).Scan(&exists); err != nil {
 		return false, false, fmt.Errorf("检查采购员失败: %w", err)