得到这个异常：“android.database.sqlite.SQLiteException：没有这样的列：_id：，同时编译”当我有一个_id列

Question

我每次运行我的应用程序时都会收到此异常。不知道是什么原因造成的。下面是这方面的一些背景资料：

• 我有这个在我的全局属性：

  public static final String KEY_ID = "_id"; 
  

• 并且在这之后我有一个字符串变量设置我的数据库列：

  private static final String DATABASE_CREATE = 
        "create table sdCards (_id integer primary key autoincrement, " 
        + "arg0 text not null, " 
        + "arg1 integer not null, " 
          + "arg2 integer not null, " 
          + "arg3 integer not null, " 
          + "arg4 integer not null, " 
          + "arg5 integer not null);"; 
  

• 最后，我创建这样的数据库：

  public void onCreate(SQLiteDatabase db) { 
      db.execSQL(DATABASE_CREATE); 
  } 
  

不完全确定发生了什么事。我清楚地有一个_id列！任何帮助将不胜感激！

编辑：这是我的logcat

E/AndroidRuntime(24036): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mydomain.packagename/com.mydomain.packagename.MainClass}: android.database.sqlite.SQLiteException: no such column: _id: , while compiling: SELECT _id, arg0, arg1, arg2, arg3, arg4, arg5 FROM table_name 
E/AndroidRuntime(24036): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1741) 
E/AndroidRuntime(24036): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1757) 
E/AndroidRuntime(24036): at android.app.ActivityThread.access$1500(ActivityThread.java:123) 
E/AndroidRuntime(24036): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:998) 
E/AndroidRuntime(24036): at android.os.Handler.dispatchMessage(Handler.java:99) 
E/AndroidRuntime(24036): at android.os.Looper.loop(Looper.java:126) 
E/AndroidRuntime(24036): at android.app.ActivityThread.main(ActivityThread.java:4002) 
E/AndroidRuntime(24036): at java.lang.reflect.Method.invokeNative(Native Method) 
E/AndroidRuntime(24036): at java.lang.reflect.Method.invoke(Method.java:491) 
E/AndroidRuntime(24036): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844) 
E/AndroidRuntime(24036): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
E/AndroidRuntime(24036): at dalvik.system.NativeStart.main(Native Method) 
E/AndroidRuntime(24036): Caused by: android.database.sqlite.SQLiteException: no such column: _id: , while compiling: SELECT _id, sdName, writes, modifications, moved, deletes FROM sdCards 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:147) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:368) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:131) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:95) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:46) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1534) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1414) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1370) 
E/AndroidRuntime(24036): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1450) 
E/AndroidRuntime(24036): at com.mydomain.packagename.DbAdapter.fetchAllSd(DbAdapter.java:131) 
E/AndroidRuntime(24036): at com.mydomain.packagename.MainClass.fillData(SDBenchmark.java:70) 
E/AndroidRuntime(24036): at com.mydomain.packagename.MainClass.onCreate(SDBenchmark.java:28) 
E/AndroidRuntime(24036): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 
E/AndroidRuntime(24036): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1705) 
E/AndroidRuntime(24036): ... 11 more 

Answer 1

尝试删除数据库（可能是通过卸载你的应用程序），然后尝试运行的应用程序。这将重新创建您的数据库。一种可能是您已经创建了表，并且某处选择失败，因为_id列从未创建过。