AndroidでSQliteデータベースのテーブルを作成しようとしています。テーブルには、Int id、URL リンク、文字列のタイトル、文字列の説明、日付の 5 つの列があります。
私のコードを構築するために、これとこれを参照として使用してきましたが、カーソルに文字列以外のものを追加する方法はどちらも示していません。
私のコードは次のとおりです。
public class Chapter {
final SimpleDateFormat FORMATTER =
new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z");
private String title;
private URL link;
private String description;
private Date date;
private int id;
//Constructor for table includes ID.
public Chapter(int id, URL link, String title, String description, Date date) {
this.id = id;
this.link = link;
this.title = title;
this.description = description;
this.date = date;
}
//Empty Constructor
public Chapter() {
// TODO Auto-generated constructor stub
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title.trim();
}
// getters and setters omitted for brevity
public URL getLink() {
return link;
}
public void setLink(String link) {
try {
this.link = new URL(link);
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description.trim();
}
public String getDate() {
return FORMATTER.format(this.date);
}
public void setDate(String date) {
// pad the date if necessary
while (!date.endsWith("00")){
date += "0";
}
date = "";
try {
this.date = FORMATTER.parse(date.trim());
} catch (ParseException e) {
throw new RuntimeException(e);
}
}
public Chapter copy(){
Chapter copy = new Chapter();
copy.title = title;
copy.link = link;
copy.description = description;
copy.date = date;
return copy;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Title: ");
sb.append(title);
sb.append('\n');
sb.append("Date: ");
sb.append(this.getDate());
sb.append('\n');
sb.append("Link: ");
sb.append(link);
sb.append('\n');
sb.append("Description: ");
sb.append(description);
return sb.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((date == null) ? 0 : date.hashCode());
result = prime * result
+ ((description == null) ? 0 : description.hashCode());
result = prime * result + ((link == null) ? 0 : link.hashCode());
result = prime * result + ((title == null) ? 0 : title.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Chapter other = (Chapter) obj;
if (date == null) {
if (other.date != null)
return false;
} else if (!date.equals(other.date))
return false;
if (description == null) {
if (other.description != null)
return false;
} else if (!description.equals(other.description))
return false;
if (link == null) {
if (other.link != null)
return false;
} else if (!link.equals(other.link))
return false;
if (title == null) {
if (other.title != null)
return false;
} else if (!title.equals(other.title))
return false;
return true;
}
public int compareTo(Chapter another) {
if (another == null) return 1;
// sort descending, most recent first
return another.date.compareTo(date);
}
public int getId() {
// TODO Auto-generated method stub
return id;
}
public void setId(int parseInt) {
// TODO Auto-generated method stub
this.id = id;
}
public void setImage(String string) {
// TODO Auto-generated method stub
}
そして私のヘルパークラス：
public class ChapterSQLiteOpenHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "chaptertable";
private static final int DATABASE_VERSION = 1;
// Database table
public static final String TABLE_CHAPTER = "Chapter";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_LINK = "link";
public static final String COLUMN_TITLE = "title";
public static final String COLUMN_DESCRIPTION = "description";
public static final String COLUMN_PUBDATE = "pubdate";
public static final String COLUMN_IMAGEID = "imageid";
// Database creation SQL statement
private static final String DATABASE_CREATE = "create table "
+ TABLE_CHAPTER
+ "("
+ COLUMN_ID + " integer primary key autoincrement, "
+ COLUMN_LINK + " text not null, "
+ COLUMN_TITLE + " text not null,"
+ COLUMN_DESCRIPTION + " text not null"
+ COLUMN_PUBDATE + " text not null,"
+ COLUMN_IMAGEID + " text not null,"
+ ");";
public ChapterSQLiteOpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Method is called during creation of the database
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
}
// Method is called during an upgrade of the database,
// e.g. if you increase the database version
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CHAPTER);
// Create tables again
onCreate(db);
}
/**
* All CRUD(Create, Read, Update, Delete) Operations
*/
// Adding new contact
void addContact(Chapter chapter) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_ID, chapter.getId()); // Chapter ID
values.put(COLUMN_LINK, chapter.getLink()); // Chapter Link
values.put(COLUMN_TITLE, chapter.getTitle()); // Chapter Title
values.put(COLUMN_DESCRIPTION, chapter.getDescription()); // Chapter Description
values.put(COLUMN_PUBDATE, chapter.getDate()); // Chapter Date
//values.put(COLUMN_IMAGEID, chapter.getImage()); // Chapter Image
// Inserting Row
db.insert(TABLE_CHAPTER, null, values);
db.close(); // Closing database connection
}
// Getting single contact
Chapter getChapter(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_CHAPTER, new String[] { COLUMN_ID,
COLUMN_ID, COLUMN_LINK }, COLUMN_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Chapter chapter = new Chapter(Integer.parseInt(cursor.getString(0)), cursor.getURL(1), cursor.getString(2), cursor.getString(3), cursor.getString(4));
// return contact
return chapter;
}
// Getting All Contacts
public List<Chapter> getAllContacts() {
List<Chapter> chapterList = new ArrayList<Chapter>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_CHAPTER;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Chapter chapter = new Chapter();
chapter.setId(Integer.parseInt(cursor.getString(0)));
chapter.setLink(cursor.getURL(1));
chapter.setTitle(cursor.getString(2));
chapter.setDescription(cursor.getString(3));
chapter.setDate(cursor.getString(4));
//chapter.setImage(cursor.getString(5));
// Adding chapter to list
chapterList.add(chapter);
} while (cursor.moveToNext());
}
// return contact list
return chapterList;
}
// Updating single contact
public int updateContact(Chapter chapter) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_ID, chapter.getId());
values.put(COLUMN_LINK, chapter.getLink());
values.put(COLUMN_TITLE, chapter.getTitle());
values.put(COLUMN_DESCRIPTION, chapter.getDescription());
values.put(COLUMN_PUBDATE, chapter.getDate());
//values.put(COLUMN_IMAGEID, chapter.getImage());
// updating row
return db.update(TABLE_CHAPTER, values, COLUMN_ID + " = ?",
new String[] { String.valueOf(chapter.getId()) });
}
// Deleting single contact
public void deleteContact(Chapter chapter) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CHAPTER, COLUMN_ID + " = ?",
new String[] { String.valueOf(chapter.getId()) });
db.close();
}
// Getting contacts Count
public int getChaptersCount() {
String countQuery = "SELECT * FROM " + TABLE_CHAPTER;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
リンクの values.put 行と、Chapter chapter = new Chapter... 行でコンパイル エラーが発生します。