feat(验证): 添加钢卷号和批次顺序的验证逻辑

在PDI创建和更新操作中添加以下验证：
1. 钢卷号必须为12位
2. 批次编号不能小于已有最大批次
3. 同一批次内顺序号不能重复且必须递增

backend/main.py

@@ -165,6 +165,37 @@ def create_pdi(data: PDIPLTMCreate):
     conn = get_connection()
     cursor = conn.cursor()
     try:
+        # 1. 验证钢卷号长度
+        if len(data.coilid) != 12:
+            raise HTTPException(status_code=400, detail="钢卷号必须为12位")
+        
+        # 2. 验证批次编号
+        if data.rollprogramnb:
+            # 获取数据库中最大的批次编号
+            cursor.execute("SELECT MAX(ROLLPROGRAMNB) FROM PLTM.PDI_PLTM")
+            max_batch = cursor.fetchone()[0]
+            if max_batch and data.rollprogramnb < max_batch:
+                raise HTTPException(status_code=400, detail="批次编号不能小于已有的最大批次编号")
+        
+        # 3. 验证顺序号
+        if data.rollprogramnb and data.sequencenb:
+            # 检查本批次内是否已存在相同的顺序号
+            cursor.execute("""
+                SELECT COUNT(*) FROM PLTM.PDI_PLTM 
+                WHERE ROLLPROGRAMNB = :batch AND SEQUENCENB = :seq
+            """, {"batch": data.rollprogramnb, "seq": data.sequencenb})
+            if cursor.fetchone()[0] > 0:
+                raise HTTPException(status_code=400, detail="本批次内顺序号不能重复")
+            
+            # 检查本批次内的最大顺序号
+            cursor.execute("""
+                SELECT MAX(SEQUENCENB) FROM PLTM.PDI_PLTM 
+                WHERE ROLLPROGRAMNB = :batch
+            """, {"batch": data.rollprogramnb})
+            max_seq = cursor.fetchone()[0]
+            if max_seq and data.sequencenb <= max_seq:
+                raise HTTPException(status_code=400, detail="本批次内顺序号必须递增")
+        
         fields = {k: v for k, v in data.model_dump(exclude_none=True).items()}
         cols = ", ".join(f.upper() for f in fields.keys())
         vals = ", ".join([f":{k}" for k in fields.keys()])
@@ -195,6 +226,46 @@ def update_pdi(coilid: str, data: PDIPLTMUpdate):
         fields = {k: v for k, v in data.model_dump(exclude_none=True).items()}
         if not fields:
             raise HTTPException(status_code=400, detail="无更新字段")
+        
+        # 验证批次编号
+        if "rollprogramnb" in fields:
+            # 获取数据库中最大的批次编号
+            cursor.execute("SELECT MAX(ROLLPROGRAMNB) FROM PLTM.PDI_PLTM")
+            max_batch = cursor.fetchone()[0]
+            if max_batch and fields["rollprogramnb"] < max_batch:
+                raise HTTPException(status_code=400, detail="批次编号不能小于已有的最大批次编号")
+        
+        # 验证顺序号
+        if "rollprogramnb" in fields or "sequencenb" in fields:
+            # 获取当前记录的批次编号和顺序号
+            cursor.execute("""
+                SELECT ROLLPROGRAMNB, SEQUENCENB FROM PLTM.PDI_PLTM 
+                WHERE COILID = :coilid
+            """, {"coilid": coilid})
+            current = cursor.fetchone()
+            if not current:
+                raise HTTPException(status_code=404, detail="记录不存在")
+            
+            new_batch = fields.get("rollprogramnb", current[0])
+            new_seq = fields.get("sequencenb", current[1])
+            
+            # 检查本批次内是否已存在相同的顺序号（排除当前记录）
+            cursor.execute("""
+                SELECT COUNT(*) FROM PLTM.PDI_PLTM 
+                WHERE ROLLPROGRAMNB = :batch AND SEQUENCENB = :seq AND COILID != :coilid
+            """, {"batch": new_batch, "seq": new_seq, "coilid": coilid})
+            if cursor.fetchone()[0] > 0:
+                raise HTTPException(status_code=400, detail="本批次内顺序号不能重复")
+            
+            # 检查本批次内的最大顺序号
+            cursor.execute("""
+                SELECT MAX(SEQUENCENB) FROM PLTM.PDI_PLTM 
+                WHERE ROLLPROGRAMNB = :batch AND COILID != :coilid
+            """, {"batch": new_batch, "coilid": coilid})
+            max_seq = cursor.fetchone()[0]
+            if max_seq and new_seq <= max_seq:
+                raise HTTPException(status_code=400, detail="本批次内顺序号必须递增")
+        
         set_clause = ", ".join([f"{k.upper()} = :{k}" for k in fields.keys()])
         fields["coilid_"] = coilid
         sql = f"UPDATE PLTM.PDI_PLTM SET {set_clause} WHERE COILID = :coilid_"