: Failed to read row 0, column -1 from a CursorWindow which has 1 rows, 9 columns.解决

在android 数据库开发中碰到了这么一个错误：

E/CursorWindow: Failed to read row 0, column -1 from a CursorWindow which has 1 rows, 9 columns.

E/com.ishow.app.manager.AppManager: java.lang.RuntimeException: Unable to create service com.ishow.app.lbs.LBSService: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing
data from it.

                                        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3145)

                                        at android.app.ActivityThread.access$1800(ActivityThread.java:185)

                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1655)

                                        at android.os.Handler.dispatchMessage(Handler.java:111)

                                        at android.os.Looper.loop(Looper.java:194)

                                        at android.app.ActivityThread.main(ActivityThread.java:5847)

                                        at java.lang.reflect.Method.invoke(Native Method)

                                        at java.lang.reflect.Method.invoke(Method.java:372)

                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1010)

                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)

                                     Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.

                                        at android.database.CursorWindow.nativeGetString(Native Method)

                                        at android.database.CursorWindow.getString(CursorWindow.java:438)

                                        at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:66)

                                        at com.ishow.app.dao.impl.AccountDaoImpl.getAccount(AccountDaoImpl.java:87)

                                        at com.ishow.app.dao.impl.AccountDaoImpl.getCurrentAccount(AccountDaoImpl.java:67)

                                        at com.ishow.app.protocol.BaseProtocol.<init>(BaseProtocol.java:29)

                                        at com.ishow.app.protocol.AbstractProtocol.<init>(AbstractProtocol.java:0)

                                        at com.ishow.app.protocol.AppRecordProtocol.<init>(AppRecordProtocol.java:0)

                                        at com.ishow.app.api.AppRecordHandler.post(AppRecordHandler.java:63)

                                        at com.ishow.app.api.AppRecordHandler.post(AppRecordHandler.java:59)

                                        at com.ishow.app.lbs.LBSService.onCreate(LBSService.java:57)

                                        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3135)

                                        at android.app.ActivityThread.access$1800(ActivityThread.java:185)

                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1655)

                                        at android.os.Handler.dispatchMessage(Handler.java:111)

                                        at android.os.Looper.loop(Looper.java:194)

                                        at android.app.ActivityThread.main(ActivityThread.java:5847)

                                        at java.lang.reflect.Method.invoke(Native Method)

                                        at java.lang.reflect.Method.invoke(Method.java:372)

                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1010)

                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)

                                    ,version=2.2.5.14,exception time=2017-03-22  16:08:49

I/Process: Sending signal. PID: 19041 SIG: 9
Disconnected from the target VM, address: 'localhost:8611', transport: 'socket'

发生错误的主要原因是：

因为需求的变动，要在原有的数据库中新增一个字段，新增了字段后所有的工作都准备得差不多了，但忽略了一个地方，就是数据库版本还没有升级，运行后先读取数据库，没有新增的字段，进而导致以上异常的发生

解决方法：

将数据库版本升级后，在数据库版本更新方法中新增该字段，问题解决