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我正在使用jpa和MySQL開發文檔管理應用程序spring。該應用程序目前正在接受來自用戶Web表單createOrUpdateDocumentForm.jsp的文檔及其元數據到控制器DocumentController.java中。但是，數據並未進入MySQL數據庫。有人能告訴我如何改變我的代碼，以便文檔及其元數據存儲在底層數據庫中嗎？在spring jpa文件管理器應用程序中未保存的文檔
數據（包括PDF文件）的流動似乎要經過以下對象：
createOrUpdateDocumentForm.jsp //omitted for brevity, since it is sending data to controller (see below)
Document.java
DocumentController.java
ClinicService.java
JpaDocumentRepository.java
The MySQL database
我會總結這些對象的相關部分如下：
的jsp觸發在DocumentController.java以下方法：
@RequestMapping(value = "/patients/{patientId}/documents/new", headers = "content-type=multipart/*", method = RequestMethod.POST)
public String processCreationForm(@ModelAttribute("document") Document document, BindingResult result, SessionStatus status, @RequestParam("file") final MultipartFile file) {
document.setCreated();
byte[] contents;
Blob blob = null;
try {
contents = file.getBytes();
blob = new SerialBlob(contents);
} catch (IOException e) {e.printStackTrace();}
catch (SerialException e) {e.printStackTrace();}
catch (SQLException e) {e.printStackTrace();}
document.setContent(blob);
document.setContentType(file.getContentType());
document.setFileName(file.getOriginalFilename());
System.out.println("----------- document.getContentType() is: "+document.getContentType());
System.out.println("----------- document.getCreated() is: "+document.getCreated());
System.out.println("----------- document.getDescription() is: "+document.getDescription());
System.out.println("----------- document.getFileName() is: "+document.getFileName());
System.out.println("----------- document.getId() is: "+document.getId());
System.out.println("----------- document.getName() is: "+document.getName());
System.out.println("----------- document.getPatient() is: "+document.getPatient());
System.out.println("----------- document.getType() is: "+document.getType());
try {System.out.println("[[[[BLOB LENGTH IS: "+document.getContent().length()+"]]]]");}
catch (SQLException e) {e.printStackTrace();}
new DocumentValidator().validate(document, result);
if (result.hasErrors()) {
System.out.println("result.getFieldErrors() is: "+result.getFieldErrors());
return "documents/createOrUpdateDocumentForm";
}
else {
this.clinicService.saveDocument(document);
status.setComplete();
return "redirect:/patients?patientID={patientId}";
}
}
當我通過網絡的形式在提交的文件到controller，所述System.out.println()命令在controller代碼輸出以下，這表明，該數據實際上是在得到發送給服務器：
----------- document.getContentType() is: application/pdf
----------- document.getCreated() is: 2013-12-16
----------- document.getDescription() is: paper
----------- document.getFileName() is: apaper.pdf
----------- document.getId() is: null
----------- document.getName() is: apaper
----------- document.getPatient() is: [[email protected] id = 1, new = false, lastName = 'Frank', firstName = 'George', middleinitial = 'B', sex = 'Male', dateofbirth = 2000-11-28T16:00:00.000-08:00, race = 'caucasian']
----------- document.getType() is: ScannedPatientForms
[[[[BLOB LENGTH IS: 712238]]]] //This indicates the file content was converted to blob
的Document.java模型爲：
@Entity
@Table(name = "documents")
public class Document {
@Id
@GeneratedValue
@Column(name="id")
private Integer id;
@ManyToOne
@JoinColumn(name = "client_id")
private Patient patient;
@ManyToOne
@JoinColumn(name = "type_id")
private DocumentType type;
@Column(name="name")
private String name;
@Column(name="description")
private String description;
@Column(name="filename")
private String filename;
@Column(name="content")
@Lob
private Blob content;
@Column(name="content_type")
private String contentType;
@Column(name = "created")
private Date created;
public Integer getId(){return id;}
public void setId(Integer i){id=i;}
protected void setPatient(Patient patient) {this.patient = patient;}
public Patient getPatient(){return this.patient;}
public void setType(DocumentType type) {this.type = type;}
public DocumentType getType() {return this.type;}
public String getName(){return name;}
public void setName(String nm){name=nm;}
public String getDescription(){return description;}
public void setDescription(String desc){description=desc;}
public String getFileName(){return filename;}
public void setFileName(String fn){filename=fn;}
public Blob getContent(){return content;}
public void setContent(Blob ct){content=ct;}
public String getContentType(){return contentType;}
public void setContentType(String ctype){contentType=ctype;}
public void setCreated(){created=new java.sql.Date(System.currentTimeMillis());}
public Date getCreated() {return this.created;}
@Override
public String toString() {return this.getName();}
public boolean isNew() {return (this.id == null);}
}
的ClinicService.java代碼從DocumentController稱爲是：
private DocumentRepository documentRepository;
private PatientRepository patientRepository;
@Autowired
public ClinicServiceImpl(DocumentRepository documentRepository, PatientRepository patientRepository) {
this.documentRepository = documentRepository;
this.patientRepository = patientRepository;
}
@Override
@Transactional
public void saveDocument(Document doc) throws DataAccessException {documentRepository.save(doc);}
釷在JpaDocumentRepository.javaë相關代碼：
@PersistenceContext
private EntityManager em;
@Override
public void save(Document document) {
if (document.getId() == null) {this.em.persist(document);}
else {this.em.merge(document);}
}
最後，創建數據庫的SQL代碼的相關部分包括：
CREATE TABLE IF NOT EXISTS documenttypes (
id INT(4) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(80),
INDEX(name)
);
CREATE TABLE IF NOT EXISTS patients (
id INT(4) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
first_name VARCHAR(30),
middle_initial VARCHAR(5),
last_name VARCHAR(30),
sex VARCHAR(20),
date_of_birth DATE,
race VARCHAR(30),
INDEX(last_name)
);
CREATE TABLE IF NOT EXISTS documents (
id int(11) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
client_id int(4) UNSIGNED NOT NULL,
type_id INT(4) UNSIGNED,
name varchar(200) NOT NULL,
description text NOT NULL,
filename varchar(200) NOT NULL,
content mediumblob NOT NULL,
content_type varchar(255) NOT NULL,
created timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
FOREIGN KEY (client_id) REFERENCES patients(id),
FOREIGN KEY (type_id) REFERENCES documenttypes(id)
);
我對這個代碼什麼樣的變化，使其節省了document在documents表中MySQL數據庫使用jpa？
我認爲沒有錯誤，而其他數據被提交到數據庫？ –
@ user2310289在此操作期間，我在eclipse控制檯中沒有看到錯誤。此應用程序中的另一個模塊確實提交了數據以將人員添加到數據庫，但添加文檔模塊不提交任何數據。在tomcat服務器中加載應用程序時唯一的錯誤是，但應用程序確實加載了，然後當前問題中的代碼運行時沒有發生任何錯誤。如果你認爲加載應用程序時發生的錯誤是相關的，你可以看看這篇文章：http://stackoverflow.com/questions/20622746/exception-loading-sessions-from-persistent-storage – CodeMed
「The只有在tomcat服務器中加載應用程序時出現錯誤「是什麼？另外，你在jsp上的表單是否具有這個屬性：'enctype =「multipart/form-data」' –