Java 每当我打开intent时，Sqlite select语句都会导致错误

这是我的密码

前3个函数在数据库类中

public void onCreate(SQLiteDatabase db){

        String creation_query3= "CREATE TABLE "
                + TABLE_Doctor + "(" + Doctor_ID
                + " INTEGER PRIMARY KEY," + Doctor_NAME
                + " TEXT, " + Doctor_PHONE + "TEXT )";

        db.execSQL(creation_query3);

    }

public void adddoctor(String pName, String ph){

        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues cv = new ContentValues();
        cv.put(Doctor_NAME,pName);
        cv.put(Doctor_PHONE,ph);
        db.insert(TABLE_Doctor, null, cv);
        db.close();
}

public String getAllDoctors(){

        Cursor cursor = getReadableDatabase().rawQuery("SELECT "+Doctor_NAME+" FROM "+ TABLE_Doctor, null);
        cursor.moveToFirst();

        String s=cursor.getString(cursor.getColumnIndexOrThrow(Doctor_NAME));
        cursor.close();
        return s;           
    }

这是主课

{

String test=db.getAllDoctors();

textView.setText(test.toString());

}

以下是错误：

01-17 14:30:02.490 27929-27929/com.example.ghumdan.finalprojectkg 

E/AndroidRuntime: FATAL EXCEPTION: main                                                                                  

java.lang.RuntimeException: Unable to start activity 

ComponentInfo{com.example.ghumdan.finalprojectkg/com.example.ghumdan.finalprojectkg.AddPatient}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
                                                                                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2247)
                                                                                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
                                                                                        at android.app.ActivityThread.access$700(ActivityThread.java:152)
                                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
                                                                                        at android.os.Handler.dispatchMessage(Handler.java:99)
                                                                                        at android.os.Looper.loop(Looper.java:137)
                                                                                        at android.app.ActivityThread.main(ActivityThread.java:5328)
                                                                                        at java.lang.reflect.Method.invokeNative(Native Method)
                                                                                        at java.lang.reflect.Method.invoke(Method.java:511)
                                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
                                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
                                                                                        at dalvik.system.NativeStart.main(Native Method)
                                                                                     Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
                                                                                        at android.database.AbstractCursor.checkPosition(AbstractCursor.java:424)
                                                                                        at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
                                                                                        at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
                                                                                        at com.example.ghumdan.finalprojectkg.Database.getAllDoctors(Database.java:107)
                                                                                        at com.example.ghumdan.finalprojectkg.AddPatient.onCreate(AddPatient.java:35)
                                                                                        at android.app.Activity.performCreate(Activity.java:5250)
                                                                                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
                                                                                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
                                                                                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297) 
                                                                                        at android.app.ActivityThread.access$700(ActivityThread.java:152) 
                                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282) 
                                                                                        at android.os.Handler.dispatchMessage(Handler.java:99) 
                                                                                        at android.os.Looper.loop(Looper.java:137) 
                                                                                        at android.app.ActivityThread.main(ActivityThread.java:5328) 
                                                                                        at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                                        at java.lang.reflect.Method.invoke(Method.java:511) 
                                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102) 
                                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869) 
                                                                                        at dalvik.system.NativeStart.main(Native Method) 

---

@我的意思是应用程序崩溃了，发布你的错误

应用程序崩溃

-并非没有日志。看起来是错误

“文本，+Doctor\u PHONE+“文本”

，原因是：android.database.CursorIndexOutOfBoundsException:请求索引0，大小为0

您的光标为空。您似乎没有向其中插入任何记录。sql查询有问题……在“Doctor_PHONE”列的文本前缺少空格……应该是Doctor_PHONE+“TEXT”）；