在xp_sprintf中的Int占位符%d - SQL Server

问题描述 投票:0回答:2

我有一个XML模板我需要使用xp_sprintf基于表中的行值构建XML。此外,该表具有Int和Bit值。

表模式:StudentMark:

CREATE TABLE [dbo].[StudentMark]
(
    [StudentMarkId] [int] IDENTITY(1,1) NOT NULL,
    [StudentId] [uniqueidentifier] NOT NULL,
    [SubjectId] [uniqueidentifier] NOT NULL,
    [Score] [int] NOT NULL,
    [ScoreInfo] [xml] NOT NULL,
    [GeneratedOn] [datetime2](2) NOT NULL,
    [IsPass] [bit] NOT NULL,
    CONSTRAINT [PK_StudentMark] 
       PRIMARY KEY CLUSTERED ([StudentMarkId] ASC)
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

样本种子数据

INSERT INTO [dbo].[StudentMark] ([StudentId], [SubjectId], [ScoreInfo], GeneratedOn], [Score], [IsPass])
VALUES ('FC3CB475-B480-4129-9190-6DE880E2D581', '0D72F79E-FB48-4D3E-9906-B78A9D105081', '<StudentMarkAttribute xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></StudentMarkAttribute>', '2017-08-10 10:10:15', 95, 1),
       ('0F4EF48C-93E3-41AA-8295-F6B0E8D8C3A2', '0D72F79E-FB48-4D3E-9906-B78A9D105081', '<StudentMarkAttribute xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></StudentMarkAttribute>', '2017-08-10 10:10:15', 100, 1),
       ('0F4EF48C-93E3-41AA-8295-F6B0E8D8C3A2', 'AB172272-D2E9-49E1-8040-6117BB6743DB', '<StudentMarkAttribute xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></StudentMarkAttribute>', '2017-08-16 09:06:20', 25, 0),
       ('FC3CB475-B480-4129-9190-6DE880E2D581', 'AB172272-D2E9-49E1-8040-6117BB6743DB', '<StudentMarkAttribute xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></StudentMarkAttribute>', '2017-08-16 09:06:20', 82, 1);

要求:我需要将Row转换为以下XML,并需要在相应记录的列[dbo].[StudentMark].[ScoreInfo]中进行更新。

XML模板:

<ScoreInfo>
    <StudentMarkId>%d</StudentMarkId>
    <StudentId>%s</StudentId>
    <SubjectId>%s</SubjectId>
    <Score>%d</Score>
    <GeneratedOn>%s</GeneratedOn>
    <IsPass>%d</IsPass>
</ScoreInfo>

我尝试了Stackoverflow问题中的以下示例代码

declare @name varchar(150)
set @name = 'John'

declare @score int
set @score = 75

DECLARE @ret varchar(500)
exec master..xp_sprintf @ret OUTPUT, 'Hello %s, your score is %d', @name, @score

PRINT @ret

我收到以下错误消息

执行扩展存储过程时出错:无效参数类型消息50003,级别1,状态0

请帮助我如何使用指定的表[dbo].[StudentMark]构建模板XML

我提到了以下问题

请帮助我如何使用数字格式说明符等,

sql sql-server printf string-formatting format-specifiers
2个回答
2
投票

xp_sprintf only supports string arguments and %s placeholders,因此无法在SQL Server中使用%d占位符。您必须将数字转换为字符串,然后使用它来填充%s占位符。

满足您的要求的最简单方法是使用内置的XML功能。

update [target]
    SET [ScoreInfo] = [XmlValue]
    FROM [dbo].[StudentMark] AS target 
    JOIN (
             SELECT [StudentMarkId],
                (
                   SELECT 
                      [StudentMarkId],[StudentId], [SubjectId], [GeneratedOn], [Score], [IsPass] 
                    FROM [dbo].[StudentMark] AS innr 
                    WHERE outr.[StudentMarkId] = innr.[StudentMarkId]
                    FOR XML PATH('ScoreInfo'), TYPE
                 ) as [XmlValue]
             FROM [dbo].[StudentMark] AS outr
         ) AS source 
     ON target.[StudentMarkId] = source.[StudentMarkId]

将ScoreInfo设置为:

 <ScoreInfo>
    <StudentMarkId>%d</StudentMarkId>
    <StudentId>%s</StudentId>
    <SubjectId>%s</SubjectId>
    <Score>%d</Score>
    <GeneratedOn>%s</GeneratedOn>
    <IsPass>%d</IsPass>
 </ScoreInfo>

对于每一行,在一个查询中。


0
投票

因为xp_sprintf只支持“%s”,所以需要将任何数值CAST到VARCHAR

修改您的示例如下:

DECLARE @ret VARCHAR(500) DECLARE @name VARCHAR(150) DECLARE @val VARCHAR(10) DECLARE @score INT

设置@name ='约翰' 设置@score = 75 设置@val = CAST(@score为VARCHAR(10))

EXEC master..xp_sprintf @ret OUTPUT,'Hello%s,你的分数是%s',@ name,@ val

打印@ret

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