将数据从数据库导出到XML文件
如何使用Hibernate with annotation从数据库导出数据并将其存储在XML文件中 请告诉我任何可以帮助我的方法或教程 准备数据库:将数据从数据库导出到XML文件,xml,database,hibernate,jakarta-ee,Xml,Database,Hibernate,Jakarta Ee,如何使用Hibernate with annotation从数据库导出数据并将其存储在XML文件中 请告诉我任何可以帮助我的方法或教程 准备数据库: SerializeExample.java: setObjects private static void setObjects() { new File(DB4O_FILE_NAME).delete(); ObjectContainer container = Db4o.openFile(DB4O_FILE_NAME);
SerializeExample.java: setObjects
private static void setObjects() {
new File(DB4O_FILE_NAME).delete();
ObjectContainer container = Db4o.openFile(DB4O_FILE_NAME);
try {
Car car = new Car("BMW", new Pilot("Rubens Barrichello"));
container.store(car);
car = new Car("Ferrari", new Pilot("Michael Schumacher"));
container.store(car);
} finally {
container.close();
}
}
我们将数据库保存到XML文件“formula1.XML”:
SerializeExample.java:exportToXml
私有静态void exportToXml(){
XStream XStream=newxstream(newdomdriver());
试一试{
FileWriter xmlFile=新的FileWriter(XMLXML\u文件名);
ObjectContainer=Db4o.openFile(Db4o_文件名);
试一试{
ObjectSet结果=container.query(Car.class);
Car[]cars=新车[result.size()];
对于(int i=0;i
现在,我们可以清理数据库并尝试从XML文件重新创建它:
SerializeExample.java: importFromXml
private static void importFromXml() {
new File(DB4O_FILE_NAME).delete();
XStream xstream = new XStream(new DomDriver());
try {
FileReader xmlReader = new FileReader(XMLXML_FILE_NAME);
Car[] cars = (Car[]) xstream.fromXML(xmlReader);
ObjectContainer container;
for (int i = 0; i < cars.length; i++) {
container = Db4o.openFile(DB4O_FILE_NAME);
try {
Car car = (Car) cars[i];
container.store(car);
} finally {
container.close();
}
}
container = Db4o.openFile(DB4O_FILE_NAME);
try {
ObjectSet result = container.query(Pilot.class);
listResult(result);
result = container.query(Car.class);
listResult(result);
} finally {
container.close();
}
xmlReader.close();
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
SerializeExample.java:importFromXml
私有静态void importFromXml(){
新文件(DB4O_File_NAME).delete();
XStream XStream=newxstream(newdomdriver());
试一试{
FileReader xmlReader=新的FileReader(XMLXML文件名);
Car[]cars=(Car[])xstream.fromXML(xmlReader);
对象容器;
对于(int i=0;i
SerializeExample.java: importFromXml
private static void importFromXml() {
new File(DB4O_FILE_NAME).delete();
XStream xstream = new XStream(new DomDriver());
try {
FileReader xmlReader = new FileReader(XMLXML_FILE_NAME);
Car[] cars = (Car[]) xstream.fromXML(xmlReader);
ObjectContainer container;
for (int i = 0; i < cars.length; i++) {
container = Db4o.openFile(DB4O_FILE_NAME);
try {
Car car = (Car) cars[i];
container.store(car);
} finally {
container.close();
}
}
container = Db4o.openFile(DB4O_FILE_NAME);
try {
ObjectSet result = container.query(Pilot.class);
listResult(result);
result = container.query(Car.class);
listResult(result);
} finally {
container.close();
}
xmlReader.close();
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}