Wie "_id" genearate: "01A63D2B-1724-456E-B2C0-3B3729951654" statt "_id": ObjectId ("570602c46399e320c3022c6b")wie man autoGenearte statt mongoDB ObjectId() _ID
Mein Student.class
@Entity("student")
public class Student {
@Id
private String Id;
private long studentId;
private String studentName;
private String qualification;
public Student(){
}
public Student(long studentId, String studentName, String qualification) {
this.studentId = studentId;
this.studentName = studentName;
this.qualification = qualification;
}
public long getStudentId() {
return studentId;
}
public void setStudentId(long studentId) {
this.studentId = studentId;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public String getQualification() {
return qualification;
}
public void setQualification(String qualification) {
this.qualification = qualification;
}
}
Funktion hinzufügen JSON-Daten zu MongoDB:
public void importFromJsonToMongoDB(File file) throws FileNotFoundException{
try{
String strJson = FileUtils.readFileToString(file, StandardCharsets.UTF_8);
JSONArray jsonArr = new JSONArray(strJson);
for (int i = 0; i < jsonArr.length(); i++)
{
JSONObject jsonObj = jsonArr.getJSONObject(i);
String str = jsonObj.toString();
ObjectMapper mapper = new ObjectMapper();
Student std = mapper.readValue(str, Student.class);
sr.save(std);
}
}catch (Exception e) {
e.printStackTrace();
System.out.println("Error While parsing data");
}
* Wie ID automatisch generieren? anstatt dass MongoDb es erzeugt.
Sie brauchen _id vale zu setzen, bevor Dokument zu speichern – profesor79