Question

当我创建数据库，第一个表（TABLE_CONTACTS）及其相关字段时，代码运行良好。

但是一旦我在Helper Class中的onCreate（）方法下创建了另一个表（TABLE_CATEGORIES）。

它开始显示第二个表未创建..并且弹出了许多与未创建数据库相关的异常。

以下是CODE：

// All Static variables
// Database Version
private static final int DATABASE_VERSION = 2;

// Database Name
private static final String DATABASE_NAME = "imagedb";

// Contacts table name
private static final String TABLE_CONTACTS = "contacts";

// Categories table name
private static final String TABLE_CATEGORIES = "categories";

// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_IMAGE = "image";

// Categories Table Columns names
    private static final String KEY_ID1 = "id";
    private static final String KEY_NAME1 = "name";
    private static final String KEY_IMAGE1 = "image";

public DataBaseHandler(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
    final String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
            + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_NAME + " TEXT NOT NULL UNIQUE,"
            + KEY_IMAGE + " BLOB" + ")";
    db.execSQL(CREATE_CONTACTS_TABLE);
    final String CREATE_CATEGORIES_TABLE = "CREATE TABLE " + TABLE_CATEGORIES + "("
            + KEY_ID1 + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_NAME1 + " TEXT NOT NULL UNIQUE,"
            + KEY_IMAGE1 + " BLOB" + ")";
    db.execSQL(CREATE_CATEGORIES_TABLE);
}

// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // Drop older table if existed
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_CATEGORIES);

    // Create tables again
    onCreate(db);
}

LOGCAT ERROR LOG：

    12-20 13:19:33.674: E/AndroidRuntime(8677): FATAL EXCEPTION: main 12-20 13:19:33.674: E/AndroidRuntime(8677): java.lang.RuntimeException: Unable to start activityComponentInfo{com.example.android.searchabledict/com.example.android.searchabledict.CategoriesDemoActivity}: android.database.sqlite.SQLiteException: no such table: categories (code 1): , while compiling: SELECT  * FROM categories ORDER BY name1

SQLite android数据库表未正确创建

0 个答案: