Question

我想要使用这段代码来添加唯一标识符，但我似乎无法让它正常工作。以下是代码以及当前输出和所需输出。

Begin
    DECLARE @StartDate  DATETIME,
            @EndDate    DATETIME,
            @MonthList as Varchar(50),
            @NewLeaseID as int,
            @LeaseID as int,
            @PropertyID as int, 
            @Amount as int,
            @ExpectedID as int

    SELECT   
        @StartDate = '20100501'        
        ,@EndDate   = '20100801'
        ,@leaseID = 6,
        @PropertyID = 12,
        @Amount = 600,
        @ExpectedID = (SELECT ISNULL(MAX(ExpectedPaymentID) + 1, 1) FROM Payments_ExpectedPayments)

    INSERT INTO Payments_ExpectedPayments(ExpectedPaymentID, Amount, PropertyID, LeaseID, Month)
       SELECT   
          @ExpectedID as ExpectedPaymentID,
          (x.number + 1) * @Amount as Amount, 
          @PropertyID as PropertyID, 
          @leaseID as Leaseid, 
          DATENAME(MONTH, DATEADD(MONTH, x.number, @StartDate)) AS Month
       FROM    
          master.dbo.spt_values x
       WHERE   
          x.type = 'P'        
          AND x.number <= DATEDIFF(MONTH, @StartDate, @EndDate);
End

想要输出：

ExpecedID   PropertyID    LeaseID   Month      Amount
1               12          13       Jan        600
2               12          13       Feb        1200
3               12          13       March      1800
4               12          13      April       2400

我目前得到的输出：

ExpecedID   PropertyID    LeaseID   Month      Amount
1               12          13       Jan        600
1               12          13       Feb        1200
1               12          13       March      1800
1               12          13      April       2400

Answer 1

您有两种选择：

您的桌面设计需要修复。您可以使用ExpectedId的标识列。只需将CREATE TABLE从Expected int更改为Expected int identity(1,1)。
您可以在ROW_NUMBER() INSERT上使用ROW_NUMBER() OVER(ORDER BY x.number) as ExpectedId：<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring/root-context.xml</param-value> </context-param>  <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>  <servlet> <servlet-name>admin</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/admin-servlet.xml</param-value> </init-param> </servlet> <servlet> <servlet-name>student</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> </servlet> <servlet> <servlet-name>appServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>appServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>admin</servlet-name> <url-pattern>*.admin</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>student</servlet-name> <url-pattern>*.student</url-pattern> </servlet-mapping> </web-app>

Answer 2

这是失败的，因为你在select语句之前设置了一次@ExpectedID，因此你得到了所有相同的值。

尝试在SELECT语句中使用以下行替换@ExpectedID参数。

   (SELECT ISNULL(MAX(ExpectedPaymentID) + 1, 1) FROM Payments_ExpectedPayments) as ExpectedPaymentID

这将每行执行一次select语句，我想这应该可行。

将唯一标识符添加到Insert语句

2 个答案: