sql server 2005与xml实例教程
说明
query() 方法( xml 数据类型)
此方法用于对 XML 实例进行查询。
value() 方法( xml 数据类型)
此方法用于从 XML 实例检索 SQL 类型的值。
exist() 方法( xml 数据类型)
此方法用于确定查询是否返回非空结果。
modify() 方法( xml 数据类型)
此方法用于指定 XML DML 语句以执行更新。
nodes() 方法( xml 数据类型)
此方法用于将 XML 拆分成多行以将 XML 文档的组成部分传播到行集中。
闲话少说,首先创建一个包含 xml 类型的数据表,其次创建一个 xml 文件,在服务端把 xml 文件内容加载该数据表中。
复制代码 代码如下:
CREATE TABLE VisioXML
(
ID INT,
Doc XML
);
GO
创建一个名为 xxx.xml 的文件,内容如下
/*
*/
INSERT INTO VisioXML(ID,Doc)
SELECT 4,* FROM OPENROWSET(BULK 'e:xxx.xml',SINGLE_BLOB) AS x;
-- 以下为 value() 和 query() 的用法
--SELECT * FROM VisioXML WHERE ID=4
复制代码 代码如下:
SELECT
Doc.value('(/ROOT/ROW[1]/ID/text())[1]','int') RootRowID1, -- 第一行 ID 的值,并且转换为 int 类型
Doc.value('(/ROOT/ROW[2]/ID/text())[1]','int') RootRowID2, -- 第二行 ID 的值,并且转换为 int 类型
Doc.value('(/ROOT/ROW[1]/NAME/text())[1]','varchar(20)') RootRowNAME1, -- 第一行 NAME 的值,并且转换为 VARCHAR 类型
Doc.value('(/ROOT/ROW[1]/NAME/@SEX)[1]','varchar(20)') RootRowNAME1SEX, -- 第一行 NAME 中 SEX 属性的值,并且转换为 VARCHAR 类型
Doc.query('/ROOT') Root, --ROOT 下的所有 XML 内容,类型为 XML
Doc.query('/ROOT/ROW[1]') RootRow1, --ROOT 下第一行所有的 XML 内容,类型为 XML
Doc.query('/ROOT/ROW[2]') RootRow2 --ROOT 下第二行所有的 XML 内容,类型为 XML
FROM VisioXML
WHERE ID=4
-- 以下为 exist() 函数在两种环境下的用法
复制代码 代码如下:
SELECT
Doc.exist('/ROOT/ROW[1]/NAME[(@SEX cast as xs:string?) = xs:string("MALE")]') Row1EQStringMale,
Doc.exist('/ROOT/ROW[1]/NAME[(@SEX cast as xs:string?) = "MALE"]') Row1EQMale,
Doc.exist('/ROOT/ROW[1]/ID[(text()[1] cast as xs:float?) = xs:float(1)]') Row1EQfloat1,
Doc.exist('/ROOT/ROW[2]/ID[(text()[1] cast as xs:float?) = 2]') Row1EQ1
FROM VisioXML
WHERE ID=4
复制代码 代码如下:
SELECT ID,Doc
FROM VisioXML
WHERE ID=4
AND Doc.exist('/ROOT/ROW[1]/NAME[(@SEX)]')=1 -- 第一行 NAME 中存在 SEX 属性
--AND Doc.exist('/ROOT/ROW[1]/NAME[not(@SEX)]')=1 -- 第一行 NAME 中不存在 SEX 属性
--AND Doc.exist('/ROOT/ROW[1][not(ID/*)]')=1 -- 第一行不存在 ID 字段
--AND Doc.exist('/ROOT/ROW[1][(ID/*)]')=1 -- 第一行存在 ID 字段

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