public class Database extends SQLiteOpenHelper {
//DATABASE NAME,TABLES' NAMES
private static final String DATABASE_NAME = "book_db.db";
private static final int DATABASE_VERSION = 2;
private static final String BOOKS_TABLE = "books";//<--TABLE
private static final String BOOK_CATEGORIES_TABLE = "categories";//<--TABLE
private static final String AUTHORS_TABLE = "authorsTable";//<--TABLE
//BOOK_TABLE ATTRIBUTES
private static final String BOOK_KEY = "bookKey";
private static final String BOOK_TITLE = "_bookTitle";
private static final String PERSONAL_RATING = "_personalRating";
private static final String AVERAGE_RATING = "_averageRating";
private static final String IMAGE_DATA = "imageData";
private static final String BOOK_ID = "bookId";
private static final String GOOGLE_ID = "googleId";
private static final String ISBN_10 = "isbn10";
private static final String ISBN_13 = "isbn13";
private static final String BOOK_COVER_URL = "bookCoverUrl";
private static final String DESCRIPTION = "description";
private static final String CALLBACK_URL = "callBackUrl";
private static final String PREVIEW_URL = "previewUrl";
private static final String BUY_URL = "buyUrl";
private static final String PAGE_COUNT = "pageCount";
private static final String PUBLISHED_DATE = "publishedDate";
private static final String IS_BOOK_COLLECTION = "isBookCollection";
private static final String IS_BOOK_READ = "isBookRead";
private static final String IS_BOOK_IN_WHISHLIST = "isBookInWishList";
//AUTHORS TABLE ATTRIBUTES
//private static final String GOOGLE_ID = "googleId"; //Already declared above
private static final String AUTHOR = "author";
//CATEGORIES TABLE ATTRIBUTES
//private static final String GOOGLE_ID = "googleId"; //Already declared above
private static final String CATEGORY = "category";
private static Database mInstance;
public static synchronized Database getInstance(Context c) {
if (mInstance == null ) {
mInstance = new Database(c);
}
return mInstance;
}
private Database(Context context) {
super(context, DATABASE_NAME, null, 1);
//TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
//BOOKS TABLE CREATE
sqLiteDatabase.execSQL(" CREATE TABLE " + BOOKS_TABLE + " ( " + BOOK_TITLE + " TEXT, " + BOOK_KEY + " TEXT," + PERSONAL_RATING + " REAL,"
+ AVERAGE_RATING + " REAL," +
BOOK_ID + " TEXT," + GOOGLE_ID +" TEXT," + ISBN_13 + " TEXT," + ISBN_10 + " TEXT," + BOOK_COVER_URL + " TEXT," + DESCRIPTION + " TEXT," +
CALLBACK_URL + " TEXT," + PREVIEW_URL + " TEXT," + BUY_URL + " TEXT," + PAGE_COUNT + " INT," + PUBLISHED_DATE + " TEXT,"
+ IS_BOOK_COLLECTION + " INT," + IS_BOOK_READ + " INT," + IS_BOOK_IN_WHISHLIST + " INT," + IMAGE_DATA + " BLOB," + " PRIMARY KEY(" + BOOK_KEY +"));");
//No boolean type in SQLite, INT used instead.
//CATEGORIES TABLE CREATE
sqLiteDatabase.execSQL(" CREATE TABLE " + AUTHORS_TABLE + " ( " + BOOK_KEY + " TEXT, " + CATEGORY +
" TEXT, PRIMARY KEY("+ BOOK_KEY +"," + CATEGORY +"));");
//AUTHORS TABLE CREATE
sqLiteDatabase.execSQL(" CREATE TABLE " + BOOK_CATEGORIES_TABLE + " ( " + BOOK_KEY + " TEXT, " + AUTHOR +
" TEXT, PRIMARY KEY("+ BOOK_KEY +"," + AUTHOR +"));");
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + BOOKS_TABLE);
sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + BOOK_CATEGORIES_TABLE);
sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + AUTHORS_TABLE);
onCreate(sqLiteDatabase);
}
/**
* This method adds a Book to the database
* @param book
* @return
*/
public boolean addRecord(Book book){
boolean resultBooksTable = false;
boolean resultAuthorsTable = false;
boolean resultCategoriesTable = false;
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
ContentValues booksTableValues = new ContentValues();
//BOOK TABLE VALUES \\\\------///
booksTableValues.put(BOOK_KEY,book.getKey());
booksTableValues.put(BOOK_TITLE,book.getBookTitle());
booksTableValues.put(AVERAGE_RATING,book.getAverageRating());
booksTableValues.put(PERSONAL_RATING,book.getPersonalRating());
booksTableValues.put(BOOK_ID,book.getId());
booksTableValues.put(GOOGLE_ID,book.getGoogleID());
booksTableValues.put(ISBN_13,book.getISBN13());
booksTableValues.put(ISBN_10,book.getISBN10());
booksTableValues.put(BOOK_COVER_URL,book.getBookCoverURL());
booksTableValues.put(DESCRIPTION,book.getDescription());
booksTableValues.put(CALLBACK_URL,book.getCallbackURL());
booksTableValues.put(PREVIEW_URL,book.getPreviewURL());
booksTableValues.put(BUY_URL,book.getBuyURL());
booksTableValues.put(PAGE_COUNT,book.getPageCount());
booksTableValues.put(PUBLISHED_DATE,book.getPublishedDate());
booksTableValues.put(IS_BOOK_COLLECTION,book.isBookInCollection());
booksTableValues.put(IS_BOOK_READ,book.isBookRead());
booksTableValues.put(IS_BOOK_IN_WHISHLIST,book.isBookInWishlist());
booksTableValues.put(IMAGE_DATA,book.getByteArray());
//Inserting into BOOKS_TABLE
try{//Try inserting into BOOKS_TABLE
sqLiteDatabase.insertOrThrow(BOOKS_TABLE,null, booksTableValues);
resultBooksTable = true;
}catch (SQLiteConstraintException alreadyInserted){
//Row is already inserted
}
//CATEGORY Table values
ContentValues CategoriesTableValues = new ContentValues();
CategoriesTableValues.put(BOOK_KEY,book.getKey());
//AUTHORS_TABLE values
ContentValues authorsTableValues = new ContentValues();
authorsTableValues.put(BOOK_KEY,book.getKey());
//Insert categories into BOOK_CATEGORIES_TABLE
int i = 0;
if (book.getCategories().length >= 0) try {//Try inserting into CATEGORIES_TABLE
for (i = 0; i < book.getCategories().length; i++) {
CategoriesTableValues.put(CATEGORY, book.getCategories()[i]);
sqLiteDatabase.insertOrThrow(BOOK_CATEGORIES_TABLE, null, CategoriesTableValues);
}
resultCategoriesTable = true;
} catch (SQLiteConstraintException alreadyInserted) {
//Row is already inserted
}
//Insert authors into AUTHORS_TABLE
i = 0;
if (book.getAuthor().length >= 0) try {//Try inserting into CATEGORIES_TABLE
for (i = 0; i < book.getAuthor().length; i++) {
CategoriesTableValues.put(AUTHOR, book.getAuthor()[i]);
sqLiteDatabase.insertOrThrow(AUTHORS_TABLE, null, authorsTableValues);
}
resultAuthorsTable = true;
} catch (SQLiteConstraintException alreadyInserted) {
//Row is already inserted
}
return resultBooksTable && resultAuthorsTable && resultCategoriesTable;
}
/**
* Packs all books from database to a bookList and returns the list
* @return
*/
public ArrayList<Book> getSavedBooksList(){
ArrayList<Book> savedBooksList = new ArrayList<Book>();
Book book=new Book();//First declaration so it's not undeclared.
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
//Query
String q = "SELECT * FROM " + BOOKS_TABLE;//The entire table
Cursor cursor = sqLiteDatabase.rawQuery(q,null);
/////->One iteration for each book
try{
//Index of each column
int bookKeyIndex = cursor.getColumnIndex(BOOK_KEY);
int titleIndex = cursor.getColumnIndex(BOOK_TITLE);
int averageRatingIndex = cursor.getColumnIndex(AVERAGE_RATING);
int personalRatingIndex = cursor.getColumnIndex(PERSONAL_RATING);
int IdIndex = cursor.getColumnIndex(BOOK_ID);
int googleIdIndex = cursor.getColumnIndex(GOOGLE_ID);
int isbn13Index = cursor.getColumnIndex(ISBN_13);
int isbn10Index = cursor.getColumnIndex(ISBN_10);
int urlIndex = cursor.getColumnIndex(BOOK_COVER_URL);
int descriptionIndex = cursor.getColumnIndex(DESCRIPTION);
int callbackUrlIndex = cursor.getColumnIndex(CALLBACK_URL);
int previewUrlIndex = cursor.getColumnIndex(PREVIEW_URL);
int buyUrlIndex = cursor.getColumnIndex(BUY_URL);
int pageCountIndex = cursor.getColumnIndex(PAGE_COUNT);
int dateIndex = cursor.getColumnIndex(PUBLISHED_DATE);
int isBookCollectionIndex = cursor.getColumnIndex(IS_BOOK_COLLECTION);
int isBookReadIndex = cursor.getColumnIndex(IS_BOOK_READ);
int isBookInWishlistIndex = cursor.getColumnIndex(IS_BOOK_IN_WHISHLIST);
int bookCoverIndex = cursor.getColumnIndex(IMAGE_DATA);
cursor.moveToPosition(-1);
while(cursor.moveToNext()){
book = new Book();
book.setId(cursor.getString(IdIndex));
book.setAverageRating(averageRatingIndex);
book.setPersonalRating(personalRatingIndex);
book.setBookTitle(cursor.getString(titleIndex));
book.setBookCoverURL(cursor.getString(urlIndex));
book.setDescription(cursor.getString(descriptionIndex));
book.setGoogleID(cursor.getString(googleIdIndex));
book.setCallbackURL(cursor.getString(callbackUrlIndex));
book.setPreviewURL(cursor.getString(previewUrlIndex));
book.setBuyURL(cursor.getString(buyUrlIndex));
book.setPageCount(cursor.getInt(pageCountIndex));
book.setPublishedDate(cursor.getString(dateIndex));
book.setISBN13(cursor.getString(isbn13Index));
book.setISBN10(cursor.getString(isbn10Index));
book.setBookInCollection(1 == cursor.getInt(isBookCollectionIndex));//1==int var (converts int to boolean)
book.setBookRead(1 == cursor.getInt(isBookReadIndex));//SQLite doesn't support boolean.
book.setBookInWishlist(1 == cursor.getInt(isBookInWishlistIndex));
book.setBitmapFromByteArray(cursor.getBlob(bookCoverIndex));
//Query of categories of the current book
String q1 = null;
q1 = "SELECT * FROM " + BOOK_CATEGORIES_TABLE
+ " WHERE " + BOOK_CATEGORIES_TABLE + "." + BOOK_KEY + "='" + book.getKey() + "'";
Cursor cursorCategories = sqLiteDatabase.rawQuery(q1,null);
//Query of authors of the current book
String q2 = null;
q2 = "SELECT * FROM " + AUTHORS_TABLE
+ " WHERE " + AUTHORS_TABLE + "." + BOOK_KEY + "='" + book.getKey() + "'";
Cursor cursorAuthors = sqLiteDatabase.rawQuery(q2,null);
int categoryIndex = cursorCategories.getColumnIndex(CATEGORY);
int authorIndex = cursorAuthors.getColumnIndex(AUTHOR);
String[] categories = new String[cursorCategories.getCount()];
String[] authors = new String[cursorAuthors.getCount()];
cursorCategories.moveToPosition(-1);
cursorAuthors.moveToPosition(-1);
//Create String[] of categories
while(cursorCategories.moveToNext()) {
categories[cursorCategories.getPosition()] = cursorCategories.getString(categoryIndex);
}
book.setCategories(categories);
//Create String[] of authors
while(cursorAuthors.moveToNext()) {
authors[cursorAuthors.getPosition()] = cursorAuthors.getString(authorIndex);
}
book.setAuthor(authors);
//Add book to list
savedBooksList.add(book);
}
}catch (Exception outOfBounds){
}
finally {
cursor.close();
}
return savedBooksList;
}
/**
* This method deletes a row from the database
* @param book
* @return
*/
public boolean deleteRecord(Book book){
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
int numOfRowsDeleted = 0;
try{//Delete everything for this book from categories table
numOfRowsDeleted += sqLiteDatabase.delete(BOOK_CATEGORIES_TABLE, BOOK_KEY + "='" + book.getKey() +"'", null);
}catch (Exception noSuchColumn){
//No such column
//numOfRowsDeleted = 0;
}
try{
numOfRowsDeleted += sqLiteDatabase.delete(BOOKS_TABLE, BOOK_KEY + "='" + book.getKey() +"'", null);
}catch (Exception noSuchColumn){
//No such column
//numOfRowsDeleted = 0;
}
try{//Delete everything for this book from authors table
numOfRowsDeleted += sqLiteDatabase.delete(AUTHORS_TABLE, BOOK_KEY + "='" + book.getKey() +"'", null);
}catch (Exception noSuchColumn){
//No such column
//numOfRowsDeleted = 0;
}
if(numOfRowsDeleted > 0){//If 1 row at least deleted return true
return true;
}else{
return false;
}
}
/** Returns true if book exists in the database.
* Returns false if it doesn't.
*
* @param book
* @return
*/
public boolean isBookSaved(Book book){
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
String q = "SELECT * FROM " + BOOKS_TABLE
+ " WHERE "
+ BOOK_KEY + "='" + book.getKey() + "'";
Cursor cursor = sqLiteDatabase.rawQuery(q,null);
return cursor.moveToFirst();
}
/**
* UPDATE PERSONAL RATING
* The only variable for update is PERSONAL_RATING
* The update takes place only on BOOKS_TABLE.
* Other tables don't have to be updated.
* @param book
* @return
*/
public boolean updateRecord(Book book){
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
boolean result = false;
ContentValues booksTableValues = new ContentValues();
//BOOK TABLE VALUES \\\\------///
booksTableValues.put(BOOK_TITLE,book.getBookTitle());
booksTableValues.put(AVERAGE_RATING,book.getAverageRating());
booksTableValues.put(PERSONAL_RATING,book.getPersonalRating());
booksTableValues.put(BOOK_ID,book.getId());
booksTableValues.put(GOOGLE_ID,book.getGoogleID());
booksTableValues.put(ISBN_13,book.getISBN13());
booksTableValues.put(ISBN_10,book.getISBN10());
booksTableValues.put(BOOK_COVER_URL,book.getBookCoverURL());
booksTableValues.put(DESCRIPTION,book.getDescription());
booksTableValues.put(CALLBACK_URL,book.getCallbackURL());
booksTableValues.put(PREVIEW_URL,book.getPreviewURL());
booksTableValues.put(BUY_URL,book.getBuyURL());
booksTableValues.put(PAGE_COUNT,book.getPageCount());
booksTableValues.put(PUBLISHED_DATE,book.getPublishedDate());
booksTableValues.put(IS_BOOK_COLLECTION,book.isBookInCollection());
booksTableValues.put(IS_BOOK_READ,book.isBookRead());
booksTableValues.put(IS_BOOK_IN_WHISHLIST,book.isBookInWishlist());
booksTableValues.put(IMAGE_DATA,book.getByteArray());
String q = null;
q = "SELECT * FROM " + BOOKS_TABLE +" WHERE " + BOOK_KEY + " ='" + book.getKey() + "'";
Cursor cursor = sqLiteDatabase.rawQuery(q,null);
if(cursor.moveToFirst()){
sqLiteDatabase.update(BOOKS_TABLE, booksTableValues, q, null);
result = true;
}
cursor.close();
//sqLiteDatabase.close();
return result;
}
}
弹出以下错误:
android.database.sqlite.SQLiteException: table books has no column named isbn10 (code 1): , while compiling: INSERT INTO books(isbn10,googleId,isBookRead,bookCoverUrl,_bookTitle,buyUrl,isBookCollection,publishedDate,previewUrl,pageCount,_personalRating,bookKey,isbn13,isBookInWishList,callBackUrl,description,bookId,imageData,_averageRating) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
android.database.sqlite.SQLiteException: no such column: bookKey (code 1): , while compiling: SELECT * FROM books WHERE bookKey='4593490'
at com.example.xrhstos.bookapp.Database.isBookSaved(Database.java:381)
最佳答案
未找到列的可能原因是由于一种常见的误解，即每次 SQLiteOpenHelper 子类(又名 DatabaseHelper)的实例时都会运行 SQLiteOpenHelper 的 onCreate 方法数据库)已创建。
但是，onCreate 方法在数据库的生命周期内仅调用一次。因此，在 onCreate 方法调用的代码中对数据库结构所做的任何更改都不会应用，除非删除数据库(或者调用 onCreate 方法)其他方式)。
简单的修复方法是删除数据库，在这种情况下，onCreate 方法将运行。通过删除应用程序的数据或卸载应用程序(两者都会删除应用程序的数据，从而删除数据库)，可以轻松删除数据库。
如果数据库助手的onUpgrade方法已被写入DROP所有表，然后调用onCreate方法，那么也可以使用它。当数据库版本( super 构造函数的第 4 个参数)增加时，数据库助手会调用 onUpgrade 方法。所以这个方法需要增加版本号。
在上述所有 3 种情况中，现有数据都将丢失。如果需要保留数据，那么过程会更加复杂，并且还取决于正在进行的结构更改。
修复
要解决此问题，请执行以下操作之一:-
- 删除应用的数据。
- 卸载该应用。
- 改变
super(context, DATABASE_NAME, null, 1);至super(上下文, DATABASE_NAME, null, 2);
然后重新运行应用程序。
注意
- 这是最有可能/常见的原因。
- 尚未对您的代码进行彻底的检查测试。
- 如果问题仍然存在，请指出这一点，并且可以对代码进行更彻底的检查。
附加
经过实际测试你的代码，很可能是上述原因。即在没有对表创建 SQL 进行任何修改的情况下创建了表，因此非常强烈地表明原因如上所述。
使用您的代码，删除利用其他对象(例如 Books)的方法，并利用 Are there any methods that assist with resolving common SQLite issues? - Addition 1 - logDatabaseInfo 中的方法
然后报告的缺失列 isbn10 和 bookKey 按预期存在:-
Table = books ColumnName = bookKey ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
Table = books ColumnName = isbn10 ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = authorsTable ColumnName = bookKey ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
Table = categories ColumnName = bookKey ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
上面提取的完整输出是:-
04-24 00:29:08.459 1263-1263/soanswers.soanswers D/SQLITE_CSU: DatabaseList Row 1 Name=main File=/data/data/soanswers.soanswers/databases/book_db.db
PRAGMA - sqlite_version = 3.7.11
PRAGMA - user_version = 1
PRAGMA - encoding = UTF-8
PRAGMA - auto_vacuum = 1
PRAGMA - cache_size = 2000
PRAGMA - foreign_keys = 0
04-24 00:29:08.463 1263-1263/soanswers.soanswers D/SQLITE_CSU: PRAGMA - freelist_count = 0
PRAGMA - ignore_check_constraints = 0
PRAGMA - journal_mode = persist
PRAGMA - journal_size_limit = 524288
PRAGMA - locking_mode = normal
PRAGMA - max_page_count = 1073741823
PRAGMA - page_count = 9
PRAGMA - page_size = 4096
PRAGMA - recursive_triggers = 0
PRAGMA - reverse_unordered_selects = 0
04-24 00:29:08.467 1263-1263/soanswers.soanswers D/SQLITE_CSU: PRAGMA - secure_delete = 0
PRAGMA - synchronous = 2
PRAGMA - temp_store = 0
PRAGMA - wal_autocheckpoint = 100
Table Name = android_metadata Created Using = CREATE TABLE android_metadata (locale TEXT)
Table = android_metadata ColumnName = locale ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Number of Indexes = 0
Number of Foreign Keys = 0
Number of Triggers = 0
Table Name = books Created Using = CREATE TABLE books ( _bookTitle TEXT, bookKey TEXT,_personalRating REAL,_averageRating REAL,bookId TEXT,googleId TEXT,isbn13 TEXT,isbn10 TEXT,bookCoverUrl TEXT,description TEXT,callBackUrl TEXT,previewUrl TEXT,buyUrl TEXT,pageCount INT,publishedDate TEXT,isBookCollection INT,isBookRead INT,isBookInWishList INT,imageData BLOB, PRIMARY KEY(bookKey))
Table = books ColumnName = _bookTitle ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = bookKey ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
04-24 00:29:08.471 1263-1263/soanswers.soanswers D/SQLITE_CSU: Table = books ColumnName = _personalRating ColumnType = REAL Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = _averageRating ColumnType = REAL Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = bookId ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = googleId ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = isbn13 ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = isbn10 ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = bookCoverUrl ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = description ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = callBackUrl ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = previewUrl ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = buyUrl ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = pageCount ColumnType = INT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = publishedDate ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = isBookCollection ColumnType = INT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = isBookRead ColumnType = INT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = isBookInWishList ColumnType = INT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = books ColumnName = imageData ColumnType = BLOB Default Value = null PRIMARY KEY SEQUENCE = 0
Number of Indexes = 1
INDEX NAME = sqlite_autoindex_books_1
Sequence = 0
Unique = true
Index Origin indicator unsupported
Index Partial indicator unsupported
INDEX COLUMN = bookKey COLUMN ID = 1 SEQUENCE = 0
Number of Foreign Keys = 0
Number of Triggers = 0
Table Name = authorsTable Created Using = CREATE TABLE authorsTable ( bookKey TEXT, category TEXT, PRIMARY KEY(bookKey,category))
Table = authorsTable ColumnName = bookKey ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
Table = authorsTable ColumnName = category ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
Number of Indexes = 1
INDEX NAME = sqlite_autoindex_authorsTable_1
Sequence = 0
Unique = true
Index Origin indicator unsupported
Index Partial indicator unsupported
INDEX COLUMN = bookKey COLUMN ID = 0 SEQUENCE = 0
INDEX COLUMN = category COLUMN ID = 1 SEQUENCE = 1
04-24 00:29:08.475 1263-1263/soanswers.soanswers D/SQLITE_CSU: Number of Foreign Keys = 0
Number of Triggers = 0
Table Name = categories Created Using = CREATE TABLE categories ( bookKey TEXT, author TEXT, PRIMARY KEY(bookKey,author))
Table = categories ColumnName = bookKey ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
Table = categories ColumnName = author ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 1
Number of Indexes = 1
INDEX NAME = sqlite_autoindex_categories_1
Sequence = 0
Unique = true
Index Origin indicator unsupported
Index Partial indicator unsupported
INDEX COLUMN = bookKey COLUMN ID = 0 SEQUENCE = 0
INDEX COLUMN = author COLUMN ID = 1 SEQUENCE = 1
Number of Foreign Keys = 0
Number of Triggers = 0
logCursorColumns invoked. Cursor has the following 19 columns.
Column Name 1 is _bookTitle
Column Name 2 is bookKey
Column Name 3 is _personalRating
Column Name 4 is _averageRating
Column Name 5 is bookId
Column Name 6 is googleId
Column Name 7 is isbn13
Column Name 8 is isbn10
Column Name 9 is bookCoverUrl
Column Name 10 is description
Column Name 11 is callBackUrl
Column Name 12 is previewUrl
Column Name 13 is buyUrl
Column Name 14 is pageCount
Column Name 15 is publishedDate
04-24 00:29:08.479 1263-1263/soanswers.soanswers D/SQLITE_CSU: Column Name 16 is isBookCollection
Column Name 17 is isBookRead
Column Name 18 is isBookInWishList
Column Name 19 is imageData
logCursorColumns invoked. Cursor has the following 2 columns.
Column Name 1 is bookKey
Column Name 2 is author
logCursorColumns invoked. Cursor has the following 2 columns.
Column Name 1 is bookKey
Column Name 2 is category
关于java - Android Studio 数据库助手 没有这样的栏目，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49990725/