How to use sql trigger

CREATE TRIGGER tr_update_Stock   --自动采购触发器
ON T_Product
FOR update
AS
IF (update(Stock)) --判断stock字段是否更新
BEGIN
  --查询出库存低于下限的产品近一个月的消耗量
 --创建临时表
 IF object_id('[tempdb].[dbo].##table1') IS NOT NULL --判断临时表#tmp是否存在,存在则删除
    DROP TABLE ##table1
            SELECT * INTO ##table1 FROM (SELECT row_number() OVER (ORDER BY ProductID) AS rowNo,c.ZNumber - c.Stock AS purchaseNum,* FROM (
 SELECT  ProductID,SUM(s.Numbers) ZNumber,p.Stock,SUM(s.OutMoney) ZMoney,p.Price 
 FROM [dbo].[T_StorageOut] t inner join[dbo].[T_StorageRelation] s 
 ON t.StorageOutID=s.StorageOutID inner join T_Product p ON s.ProductID=p.Id
 WHERE t.MakerTime between Convert(VARCHAR,DATEADD(MONTH,-1,GETDATE()),23) and Convert(VARCHAR,GETDATE(),23) and ProductID in (SELECT Id FROM V_ProductSupplierInfo where (Stock-StockLowerLimit)<0)
 GROUP BY ProductID,p.Stock,p.Price) c) ddd
--计算用参数
DECLARE @purchaseNum INT,@Price NVARCHAR(50),@totalMoney NVARCHAR(50),@ZpurchaseTotal INT --采购数量,单价,总金额,总数量
SELECT @totalMoney = 0,@purchaseNum = 0,@Price = 0,@ZpurchaseTotal=0
 --采购单所需参数
  DECLARE @PurchaseNumber NVARCHAR(50),@DopurchaseId INT,@DopurchaseTime NVARCHAR(200),@PurchaseTotal INT,@PurchasePrice NVARCHAR(200),@PurchaseState INT,@PurchaseType INT
   SET @PurchaseNumber=&#39;JH&#39;+replace(replace(replace(convert(VARCHAR,getdate(),120),&#39;-&#39;,&#39;&#39;),&#39; &#39;,&#39;&#39;),&#39;:&#39;,&#39;&#39;) --进货单号JH20171031092322
--采购单详情所需参数 （产品id，产品采购价格）
  DECLARE @StockProductId INT,@DPurchasePrice NVARCHAR(20)
--循环用参数
DECLARE @curIndex INT,@rowCount INT
--判断用参数
DECLARE @OTCount INT,@PTCount INT    
SET @curIndex = 1
SELECT @rowCount = COUNT(1) FROM ##table1
IF(@rowCount>0)
BEGIN
   WHILE @curIndex <= @rowCount
   BEGIN
      --查询出第一行数据的采购数量，单价，产品id
      SELECT @purchaseNum = purchaseNum,@Price = Price,@StockProductId =ProductID FROM ##table1 WHERE rowNo = @curIndex
       --采购总金额
      SET @totalMoney = @totalMoney + @purchaseNum * CONVERT (INT,@price)
      --采购总数量
      SET @ZpurchaseTotal =@ZpurchaseTotal + @purchaseNum  
      --单个产品的采购金额 
      SET @DPurchasePrice=@purchaseNum * CONVERT (INT,@price)
      IF object_id(&#39;[tempdb].[dbo].#PTable&#39;) IS NOT NULL --判断临时表#tmp是否存在,存在则删除
       DROP TABLE #PTable
      IF object_id(&#39;[tempdb].[dbo].#OTable&#39;) IS NOT NULL --判断临时表#tmp是否存在,存在则删除
       DROP TABLE #OTable       
      --根据产品id查询出包含该产品的采购单已全部审批
      SELECT * INTO #PTable FROM (SELECT PurchaseState FROM [dbo].[T_Purchase_Order] WHERE PurchaseNumber in(SELECT PurchaseOrderId FROM  [dbo].[T_Purchase_OrderDetails] WHERE StockProductId=@StockProductId) and PurchaseState=0) AS a
      --根据产品id查询出包含该产品的订单已全部入库
      SELECT * INTO #OTable FROM (SELECT OrderState FROM T_Order WHERE OrderNumber in(SELECT OrderNumber FROM  T_OrderDetails WHERE ProductId=@StockProductId) and OrderState=0) AS c
      SELECT  @PTCount = COUNT(1) FROM #PTable
      SELECT  @OTCount = COUNT(1) FROM #OTable
          IF (@PTCount=0) --已全部审批
          BEGIN
             IF(@OTCount=0) --=0表示包含该产品的订单均已入库，可以生成新的
              BEGIN
               INSERT INTO [dbo].[T_Purchase_OrderDetails] VALUES(@PurchaseNumber,@StockProductId,@purchaseNum,@DPurchasePrice)
              END
          END
      SET @curIndex = @curIndex + 1
   END
END
  set @DopurchaseId = 16646 --自动生成
  set @DopurchaseTime=Convert(NVARCHAR,getdate(),23)   --当前时间 2017-10-31
  set @PurchaseTotal =@ZpurchaseTotal
  set @PurchasePrice =@totalMoney
  set @PurchaseState =0 --未审核
  set @PurchaseType = 2 --自动生成 
  --变量赋值完成，对采购单做添加操作
   IF (@PTCount=0)
   BEGIN
    INSERT INTO T_Purchase_Order VALUES(@PurchaseNumber,@DopurchaseId,@DopurchaseTime,@PurchaseTotal,@PurchasePrice,@PurchaseState,@PurchaseType)
   END
END

CREATE TRIGGER tr_update_Stock

DROP  TRIGGER tr_update_Stock

ALTER TABLE trig_example DISABLE TRIGGER trig1
GO

ALTER TABLE trig_example ENABLE TRIGGER trig1
GO

ALTER TABLE 你的表 DISABLE TRIGGER all

ALTER TABLE 你的表 enable TRIGGER all

exec sp_msforeachtable 'ALTER TABLE ? DISABLE TRIGGER all'

exec sp_msforeachtable 'ALTER TABLE ? enable TRIGGER all'