android.database.sqlite.SQLiteException: yok böyle bir sütun: aa:, derlerken: damızlık arasından seçim yapın Adres Nerede = aa

Question

Android sqlite veritabanından verileri geri almaya çalışıyorum ama bu tür bir sütun yok gibi çok özel bir istisna:

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SQLite Select Sorgusu olduğunu -:

c=db.rawQuery("Select Name from stud Where Address="+a,null); 

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İstisnalar: -

07-04 18:07:00.888: I/Database(648): sqlite returned: error code = 1, msg = no such column: aa 
07-04 18:07:00.910: D/AndroidRuntime(648): Shutting down VM 
07-04 18:07:00.910: W/dalvikvm(648): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
07-04 18:07:00.948: E/AndroidRuntime(648): FATAL EXCEPTION: main 
07-04 18:07:00.948: E/AndroidRuntime(648): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.my.StudentInfoManagement/com.my.StudentInfoManagement.ListData}: android.database.sqlite.SQLiteException: no such column: aa: , while compiling: Select Name from stud Where Address=aa 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.os.Looper.loop(Looper.java:123) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.app.ActivityThread.main(ActivityThread.java:3683) 
07-04 18:07:00.948: E/AndroidRuntime(648): at java.lang.reflect.Method.invokeNative(Native Method) 
07-04 18:07:00.948: E/AndroidRuntime(648): at java.lang.reflect.Method.invoke(Method.java:507) 
07-04 18:07:00.948: E/AndroidRuntime(648): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
07-04 18:07:00.948: E/AndroidRuntime(648): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
07-04 18:07:00.948: E/AndroidRuntime(648): at dalvik.system.NativeStart.main(Native Method) 
07-04 18:07:00.948: E/AndroidRuntime(648): Caused by: android.database.sqlite.SQLiteException: no such column: aa: , while compiling: Select Name from stud Where Address=aa 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1324) 
07-04 18:07:00.948: E/AndroidRuntime(648): at com.my.StudentInfoManagement.DataHelper.show(DataHelper.java:86) 
07-04 18:07:00.948: E/AndroidRuntime(648): at com.my.StudentInfoManagement.ListData.onCreate(ListData.java:19) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
07-04 18:07:00.948: E/AndroidRuntime(648): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
07-04 18:07:00.948: E/AndroidRuntime(648): ... 11 more 
07-04 18:07:03.140: I/Process(648): Sending signal. PID: 648 SIG: 9 

Answer 1

Bunun nedeni sql sorgunuzun yanlış olması. Bir metin için sorgu yaparken, sorgu dizesinin etrafına tek tırnak eklemeniz gerekir.

Satır okumalısınız: Eğer string kullanıyorsanız

c=db.rawQuery("Select Name from stud Where Address='"+a+"'",null); 

Answer 2

o zaman gibi tek tırnak içinde ifade etmek zorunda:

Cursor cursor = db.rawQuery("SELECT '"+WINNER+"' FROM '"+TABLE.trim()+"' WHERE 
     country1='"+c1.trim()+"' AND Country2='"+c2.trim()+"'", null); 

sonra bir int değerini yapabilirsiniz temsil ediyorlarsa Sadece şu şekilde kullanın: +num+