android.database.sqlite.SQLiteException : no such column: aa: , 编译时:Select Name from stud Where Address=aa

Question

我正在尝试从 android sqlite 数据库中检索数据，但它的 givine 异常是没有这样的列:

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Sqlite Select Query 是 -:

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

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异常(exception):-

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

这只是因为你的sql查询有误。查询文本时，需要在查询字符串两边加上单引号。

你的行应该是:

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