[英]query for extracting values from a column containing data in XML format
假設我有一個表mydata ,它具有一個xmldata列,其值是XML格式的文本,例如
<maindataheading>
<firstleveldata>
<pricedata pricetype="normal">123</pricedata>
</firstleveldata>
</maindataheading>
如何從xmldata列中提取<pricedata pricetype="normal">123</pricedata>
?
以下是用於從XML檢索varchar值的示例SQL:
DECLARE @MyXmlData XML
-- Read XML data into variable
SELECT @MyXmlData = xmldata
FROM MyData
-- Check if the XML node exists before attempting to retrieve it
IF @MyXmlData.exist('/maindataheading/firstleveldata/pricedata') = 1
BEGIN
DECLARE @MyDataValue VARCHAR(255)
-- Get specific XML data
SELECT @MyDataValue = ParamValues.ID.Value('.', 'varchar(255)')
FROM @MyXmlData.nodes('/maindataheading/firstleveldata/pricedata') AS ParamValues(ID)
IF @MyDataValue IS NOT NULL
BEGIN
-- Do something with data
END
END
select xmldata.query('/maindataheading/firstleveldata/pricedata')
from mydata
結果:
<pricedata pricetype="normal">123</pricedata>
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