Android I'；我在创建数据库时遇到一些错误

我正在尝试使用教程创建数据库。我还是android开发的新手，所以这可能很简单，但仍在学习中。这就是我得到的错误：

07-19 14:37:18.235: E/SQLiteLog(9089): (1) no such table: grocery
07-19 14:37:18.245: E/AndroidRuntime(9089): FATAL EXCEPTION: main
07-19 14:37:18.245: E/AndroidRuntime(9089): Process: com.dusandimitrijevic.grocerylist, PID: 9089
07-19 14:37:18.245: E/AndroidRuntime(9089): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dusandimitrijevic.grocerylist/com.dusandimitrijevic.grocerylist.MainActivity}: android.database.sqlite.SQLiteException: no such table: grocery (code 1): , while compiling: SELECT _id, title, price FROM grocery
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2693)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.ActivityThread.access$900(ActivityThread.java:177)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.os.Handler.dispatchMessage(Handler.java:102)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.os.Looper.loop(Looper.java:145)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.ActivityThread.main(ActivityThread.java:5942)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at java.lang.reflect.Method.invoke(Native Method)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at java.lang.reflect.Method.invoke(Method.java:372)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
07-19 14:37:18.245: E/AndroidRuntime(9089): Caused by: android.database.sqlite.SQLiteException: no such table: grocery (code 1): , while compiling: SELECT _id, title, price FROM grocery
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1093)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:670)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1440)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1287)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1158)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1326)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at com.dusandimitrijevic.data.GroceryDbAdapter.fetchAllItems(GroceryDbAdapter.java:145)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at com.dusandimitrijevic.grocerylist.MainActivity.fillData(MainActivity.java:79)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at com.dusandimitrijevic.grocerylist.MainActivity.onCreate(MainActivity.java:59)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.Activity.performCreate(Activity.java:6289)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
07-19 14:37:18.245: E/AndroidRuntime(9089):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
07-19 14:37:18.245: E/AndroidRuntime(9089):     ... 10 more

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我仍在学习，因此任何帮助或建议都将受到欢迎

在数据库中\u CREATE query删除引起错误的字符串中的分号

private static final String DATABASE_CREATE =
    "create table grocery (_id integer primary key autoincrement, "
    + "title text not null, price text not null)";//removed which was semicolon inside it

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最可能的情况是，您更改了数据库中定义的SQL语句，然后更改了数据库版本

更改数据库版本时，将调用onUpgrade（），并调用其中的SQL语句：

db.execSQL("DROP TABLE IF EXISTS notes");

这将尝试删除可能不存在的表

然后调用

onCreate（）

，您尝试创建一个表，但是由于它可能已经存在，所以不会发生任何事情，但是您的表仍然是在版本1中创建的表

因此，解决方案可以是：

从设备上卸载应用程序并重新安装（将删除以前版本的数据库）

删除说明：

db.execSQL("DROP TABLE IF EXISTS notes");

和使用：

db.execSQL("DROP TABLE IF EXISTS grocery");

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在SQL语句末尾加上分号绝对是合法的，这对我来说很有效，但是你能帮我做点别的吗。在将适配器设置为listView时，我得到了nullpointerexception，并且在我尝试创建SimpleCursorAdapter的方法中，它被解压。这就是我得到错误的方法：@SuppressWarnings（“deprecation”）SimpleCursorAdapter items=new SimpleCursorAdapter（This，R.layout.list_item_行，itemsCursor，from，to）；setAdapter（项目）；}方法被称为fillDataIt似乎是正确的。然而，在评论中很难形成一个问题和答案。我建议你问一个新问题。我已经提出了一个新问题。请你看一下，看看能不能帮我一下。这是你的电话号码

db.execSQL("DROP TABLE IF EXISTS grocery");