java解析xml的动态sql
时间: 2023-11-10 12:04:18 浏览: 109
可以使用Java中的DOM或SAX解析器来解析XML文件,并使用动态SQL来生成SQL语句。DOM解析器将整个XML文档加载到内存中,而SAX解析器则逐行读取XML文档。以下是一个使用DOM解析器和动态SQL的示例:
```java
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new File("example.xml"));
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//book[author='Neal Stephenson']/title/text()");
NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nl.getLength(); i++) {
String title = nl.item(i).getNodeValue();
String sql = "SELECT * FROM books WHERE title LIKE '%" + title + "%'";
// execute SQL statement
}
```
在此示例中,我们使用XPath表达式选择所有作者为“Neal Stephenson”的书籍的标题,并将其用作动态SQL语句的一部分。
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