Android SQLite ContentValues没有插入

我正在尝试将值插入到Android应用程序的SQLite数据库中。 我正在编写以下代码：

 public class DataBaseAdapter extends SQLiteOpenHelper { private static final int DATABASE_VERSION = 1; // Database Name private static final String DATABASE_NAME = "AlarmSystem"; // Alarm table name private static final String TABLE_NAME = "Alarms"; //AlarmTable Columns names private static final String KEY_ALARM_ID = "Id"; private static final String KEY_DESC = "Description"; private static final String KEY_REPEAT_DAY = "RepeatDay"; private static final String KEY_REPEAT_TYPE = "REPEAT_TYPE"; private static final String KEY_CALENDAR = "Calendar"; private static final String KEY_APP = "Device"; private static final String KEY_ACTIVE = "Active"; //creating database public DataBaseAdapter(Context con) { super(con, DATABASE_NAME, null, DATABASE_VERSION); } //creating table @Override public void onCreate(SQLiteDatabase db) { String CREATE_TABLE = "Create Table "+TABLE_NAME+"(" +KEY_ALARM_ID+" integer primary key AUTOINCREMENT, "+KEY_DESC+" TEXT, "+KEY_REPEAT_DAY+ " TEXT," +KEY_REPEAT_TYPE+" integer, "+KEY_CALENDAR+" TEXT, "+KEY_APP+" TEXT, "+KEY_ACTIVE+" integer );"; db.execSQL(CREATE_TABLE); } //updating database @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // Drop older table if existed db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); // Create tables again onCreate(db); } public void addAlarm(Alarm alarm) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(KEY_DESC, alarm.getDesc()); values.put(KEY_REPEAT_DAY, alarm.getRepeatDay()); values.put(KEY_REPEAT_TYPE, alarm.getRepeatType()); values.put(KEY_CALENDAR, Long.toString(alarm.getCalendarInMillis())); values.put(KEY_APP, alarm.getApp()); values.put(KEY_ACTIVE, alarm.getActive()); db.insert(TABLE_NAME, null, values); db.close(); } 

我不知道是什么问题。 所以我发布了Logcat：

  03-13 17:09:33.388: D/SqliteDatabaseCpp(1095): Registering sqlite logging func: /data/data/com.example.devicecontrolpanel/databases/AlarmSystem 03-13 17:09:33.408: D/SqliteDatabaseCpp(1095): DB info: open db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, flag = 6, cannot stat file, errno = 2, message = No such file or directory 03-13 17:09:33.408: D/SqliteDatabaseCpp(1095): DB info: path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle: 0x8ccc98, type: w, r/w: (0,1), mode: truncate, disk free size: 777 M 03-13 17:09:33.588: D/SqliteDatabaseCpp(1095): DB info: close db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle = 0x8ccc98, type = w, r/w = (0, 0) 03-13 17:09:33.588: D/SqliteDatabaseCpp(1095): DB info: open db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, flag = 6, file size = 4096 03-13 17:09:33.588: D/SqliteDatabaseCpp(1095): DB info: path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle: 0x8f3100, type: w, r/w: (0,1), mode: truncate, disk free size: 777 M 03-13 17:09:33.588: D/SqliteDatabaseCpp(1095): DB info: close db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle = 0x8f3100, type = w, r/w = (0, 0) 03-13 17:09:33.598: D/AndroidRuntime(1095): Shutting down VM 03-13 17:09:33.598: W/dalvikvm(1095): threadid=1: thread exiting with uncaught exception (group=0x40ae0228) 03-13 17:09:33.618: E/AndroidRuntime(1095): FATAL EXCEPTION: main 03-13 17:09:33.618: E/AndroidRuntime(1095): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.devicecontrolpanel/com.example.devicecontrolpanel.Main}: java.lang.IllegalStateException: database /data/data/com.example.devicecontrolpanel/databases/AlarmSystem (conn# 0) already closed 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2240) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.ActivityThread.access$600(ActivityThread.java:139) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.os.Handler.dispatchMessage(Handler.java:99) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.os.Looper.loop(Looper.java:156) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.ActivityThread.main(ActivityThread.java:4987) 03-13 17:09:33.618: E/AndroidRuntime(1095): at java.lang.reflect.Method.invokeNative(Native Method) 03-13 17:09:33.618: E/AndroidRuntime(1095): at java.lang.reflect.Method.invoke(Method.java:511) 03-13 17:09:33.618: E/AndroidRuntime(1095): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 03-13 17:09:33.618: E/AndroidRuntime(1095): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 03-13 17:09:33.618: E/AndroidRuntime(1095): at dalvik.system.NativeStart.main(Native Method) 03-13 17:09:33.618: E/AndroidRuntime(1095): Caused by: java.lang.IllegalStateException: database /data/data/com.example.devicecontrolpanel/databases/AlarmSystem (conn# 0) already closed 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2194) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:448) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:435) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:79) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:176) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:168) 03-13 17:09:33.618: E/AndroidRuntime(1095): at com.example.devicecontrolpanel.DataBaseAdapter.getAlarmsCount(DataBaseAdapter.java:190) 03-13 17:09:33.618: E/AndroidRuntime(1095): at com.example.devicecontrolpanel.DataBaseAdapter.getAllAlarmList(DataBaseAdapter.java:117) 03-13 17:09:33.618: E/AndroidRuntime(1095): at com.example.devicecontrolpanel.Main.onCreate(Main.java:19) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.Activity.performCreate(Activity.java:4538) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071) 03-13 17:09:33.618: E/AndroidRuntime(1095): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161) 03-13 17:09:33.618: E/AndroidRuntime(1095): ... 11 more 03-13 17:16:48.144: D/SqliteDatabaseCpp(2080): Registering sqlite logging func: /data/data/com.example.devicecontrolpanel/databases/AlarmSystem 03-13 17:16:48.144: D/SqliteDatabaseCpp(2080): DB info: open db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, flag = 6, cannot stat file, errno = 2, message = No such file or directory 03-13 17:16:48.164: D/SqliteDatabaseCpp(2080): DB info: path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle: 0x86b220, type: w, r/w: (0,1), mode: truncate, disk free size: 777 M 03-13 17:16:48.384: D/SqliteDatabaseCpp(2080): DB info: close db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle = 0x86b220, type = w, r/w = (0, 0) 03-13 17:16:48.384: D/SqliteDatabaseCpp(2080): DB info: open db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, flag = 6, file size = 5120 03-13 17:16:48.384: D/SqliteDatabaseCpp(2080): DB info: path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle: 0x897800, type: w, r/w: (0,1), mode: truncate, disk free size: 777 M 03-13 17:16:48.384: D/SqliteDatabaseCpp(2080): DB info: close db, path = /data/data/com.example.devicecontrolpanel/databases , key = 9lYvmWqw, handle = 0x897800, type = w, r/w = (0, 0) 03-13 17:16:48.394: D/AndroidRuntime(2080): Shutting down VM 03-13 17:16:48.414: W/dalvikvm(2080): threadid=1: thread exiting with uncaught exception (group=0x40ae0228) 03-13 17:16:48.424: E/AndroidRuntime(2080): FATAL EXCEPTION: main 03-13 17:16:48.424: E/AndroidRuntime(2080): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.devicecontrolpanel/com.example.devicecontrolpanel.Main}: java.lang.IllegalStateException: database /data/data/com.example.devicecontrolpanel/databases/AlarmSystem (conn# 0) already closed 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2240) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.ActivityThread.access$600(ActivityThread.java:139) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.os.Handler.dispatchMessage(Handler.java:99) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.os.Looper.loop(Looper.java:156) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.ActivityThread.main(ActivityThread.java:4987) 03-13 17:16:48.424: E/AndroidRuntime(2080): at java.lang.reflect.Method.invokeNative(Native Method) 03-13 17:16:48.424: E/AndroidRuntime(2080): at java.lang.reflect.Method.invoke(Method.java:511) 03-13 17:16:48.424: E/AndroidRuntime(2080): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 03-13 17:16:48.424: E/AndroidRuntime(2080): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 03-13 17:16:48.424: E/AndroidRuntime(2080): at dalvik.system.NativeStart.main(Native Method) 03-13 17:16:48.424: E/AndroidRuntime(2080): Caused by: java.lang.IllegalStateException: database /data/data/com.example.devicecontrolpanel/databases/AlarmSystem (conn# 0) already closed 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2194) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:448) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:435) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:79) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:176) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:168) 03-13 17:16:48.424: E/AndroidRuntime(2080): at com.example.devicecontrolpanel.DataBaseAdapter.getAlarmsCount(DataBaseAdapter.java:196) 03-13 17:16:48.424: E/AndroidRuntime(2080): at com.example.devicecontrolpanel.DataBaseAdapter.getAllAlarmList(DataBaseAdapter.java:123) 03-13 17:16:48.424: E/AndroidRuntime(2080): at com.example.devicecontrolpanel.Main.onCreate(Main.java:19) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.Activity.performCreate(Activity.java:4538) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071) 03-13 17:16:48.424: E/AndroidRuntime(2080): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161) 03-13 17:16:48.424: E/AndroidRuntime(2080): ... 11 more 

Answer 1

通常，最好在单独的类中分隔包装器方法（在您的情况下为addAlarm, editAlarm, deleteAlarm ）。 我建议你创建一个名为myAppDataSource的新类，并在该类中添加所有包装器方法，以使您的生活更轻松。

该类的代码如下所示：

  public class StudyManagerDataSource { SQLiteOpenHelper dbHelper; SQLiteDatabase database; public StudyManagerDataSource(Context context) { dbHelper = new DatabaseAdapter(context); } public void addAlarm(Alarm alarm) { // open the database connection open(); ContentValues values = new ContentValues(); values.put(KEY_DESC, alarm.getDesc()); values.put(KEY_REPEAT_DAY, alarm.getRepeatDay()); values.put(KEY_REPEAT_TYPE, alarm.getRepeatType()); values.put(KEY_CALENDAR, Long.toString(alarm.getCalendarInMillis())); values.put(KEY_APP, alarm.getApp()); values.put(KEY_ACTIVE, alarm.getActive()); database.insert(TABLE_NAME, null, values); // I will suggest to keep the connection to the database open when your app is // running, the recommended time to close the connection is when your app is //going to pause/stop. close(); } public void open() { database = dbHelper.getWritableDatabase(); Log.i(LOG_TAG, "Database Opened"); } // end method open public void close() { Log.i(LOG_TAG, "Database Closed"); dbHelper.close(); } // end method close } 

Answer 2

您应首先打开与数据库的连接，尝试将db.open（）放在onCreateMethod（）中

 //creating table @Override public void onCreate(SQLiteDatabase db) { db.open(); String CREATE_TABLE = "Create Table "+TABLE_NAME+"(" +KEY_ALARM_ID+" integer primary key AUTOINCREMENT, "+KEY_DESC+" TEXT, "+KEY_REPEAT_DAY+ " TEXT," +KEY_REPEAT_TYPE+" integer, "+KEY_CALENDAR+" TEXT, "+KEY_APP+" TEXT, "+KEY_ACTIVE+" integer );"; db.execSQL(CREATE_TABLE); } 

Answer 3

 public void addAlarm(Alarm alarm) { // open the database connection database=this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(KEY_DESC, alarm.getDesc()); values.put(KEY_REPEAT_DAY, alarm.getRepeatDay()); values.put(KEY_REPEAT_TYPE, alarm.getRepeatType()); values.put(KEY_CALENDAR, Long.toString(alarm.getCalendarInMillis())); values.put(KEY_APP, alarm.getApp()); values.put(KEY_ACTIVE, alarm.getActive()); database.insert(TABLE_NAME, null, values); // I will suggest to keep the connection to the database open when your app is // running, the recommended time to close the connection is when your app is //going to pause/stop. database.close(); }