sql:column()方法:可以在XQuery或XML DML表达式中使用来自关系列的值。 http://developer.51cto.com/art/200902/111125.htm
其中,xmlColumn是包含XML数据的列,XQueryExpression是用于指定要提取的XML节点的XPath表达式。 应用场景: 从SQL Server数据库中提取列中的XML数据在许多场景中都很有用,例如: 数据分析和报告:如果数据库中存储了包含结构化数据的XML列,可以使用提取XML数据的方法来分析和生成报告。
在SQL Server中动态解析XML数据的步骤如下: 创建包含XML数据的表格:首先,需要在数据库中创建一个包含XML数据的表格。可以使用XML数据类型的列来存储XML数据。例如,可以创建一个名为"XmlData"的表格,包含一个名为"XmlColumn"的XML数据类型列。 插入包含XML数据的行:使用INSERT语句向刚创建的表格中插入包含XML数据的...
The granularity of the XML data stored in an XML column is important for locking and, to a lesser degree, it is also important for updates. SQL Server uses the same locking mechanism for both XML and non-XML data. Therefore, row-level locking causes all XML instances in the row to be...
SQL CREATETABLET (XmlColumnxmldefaultCAST(N'<element1/><element2/>'ASxml)) SQL Server 还支持对xml类型列的 NULL 和 NOT NULL 约束。 例如: SQL CREATETABLET (XmlColumnxmlNOTNULL) 指定约束 创建xml类型的列时,可以定义列级或表级的约束。 在下列情况下,请使用约束: ...
("Col2")); SQLXML xml = rs.getSQLXML("Col3"); System.out.println("XML column : " + xml.getString()); } } catch (Exception e) { e.printStackTrace(); } } private static void showTransformer(Connection con, Statement stmt) throws Exception { // Create and execute a SQL ...
createSampleTables(stmt);// The showGetters method demonstrates how to parse the data in the// SQLXML object by using the SAX, ContentHandler and XMLReader.showGetters(stmt);// The showSetters method demonstrates how to set the xml column// by using the SAX, ContentHandler, and ResultSet....
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance XML indexes can be created on xml data type columns. They index all tags, values and paths over the XML instances in the column and benefit query performance. Your application may benefit from an XML index in the following...
--sql:column() 函数declare @t1 table(id int ,data xml);insert into @t1 ( id, data )select 1, '<root><name>二辉</name><type>流氓</type></root>'union allselect 2, '<root><name>彪</name><type>流氓</type></root>';select id, data = data.query('<root>...
SQL Server supports the xml data type, and developers can retrieve result sets including this type using standard behavior of the SqlCommand class. An xml column can be retrieved just as any column is retrieved (into a SqlDataReader, for example) but if you want to work with the content ...