- iOS/Objective-C 元类和类别
- objective-c - -1001 错误,当 NSURLSession 通过 httpproxy 和/etc/hosts
- java - 使用网络类获取 url 地址
- ios - 推送通知中不播放声音
我正在尝试将值插入 SQLite
Android 应用程序数据库。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();
}
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
最佳答案
一般来说,最好将包装器方法(在您的情况下为 addAlarm, editAlarm, deleteAlarm
)分离到一个单独的类中。我建议您创建一个名为 myAppDataSource
的新类,并在该类中添加所有包装器方法,让您的生活更轻松。
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
}
关于java - Android SQLite ContentValues 不插入,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15384550/
我正在开发一个 SQLite 数据库。数据库已经填满了,但我想重构它。这是我需要做的一个示例: 我目前有一张 table : CREATE TABLE Cars (ID INTEGER PRIMARY
我正在使用 Mono、SQLite、Dapper 和 Dapper 扩展。我可以从数据库中读取数据,但插入不起作用。我正在使用 sqlite 的 Mono 驱动程序。 错误并不能提供太多信息,至少对我
我有一个使用 SQLite 的 Windows Phone 8 应用程序。该应用程序具有许多数据库功能,并包含一个 sqlite 数据库文件,在运行该应用程序时,该文件将被复制到本地文件夹并进行访问。
为 sqlite 创建索引时有排序顺序。 https://sqlite.org/lang_createindex.html Each column name or expression can be
顾名思义,我怀疑如果有一些引用被删除的表会发生什么,例如表的某些字段的索引。 SQLite是否会自动处理?在执行drop命令之前,数据库所有者是否应注意任何实例? 最佳答案 我认为不需要家政服务。 S
我想知道是否有可能将从计数中获得的整数转换为REAL 类似于以下内容(尽管这不起作用) SELECT CAST (COUNT (ColumnA) AS Count) AS REAL) FROM Tab
我无法在SQLite数据库上执行一些更新。我正在Windows上使用SQLite 3 Shell。 我正在运行以下命令: update resovled_chrom_counts set genus
我知道SQLite中的触发器顺序是不确定的(您不能确定将首先执行哪个触发器),但是表约束和触发器之间的关系又如何呢? 我的意思是,假设我在一个列中有一个UNIQUE(或CHECK)约束,并且在该表上有
我的 CustomTags 表可能有一系列“临时”记录,其中 Tag_ID 为 0,并且 Tag_Number 将有一些五位数的值。 定期,我想清理我的 Sqlite 表以删除这些临时值。 例如,我可
我有A,B,C和D的记录。 我的SQL1 SELECT * FROM main_table order by main_table.date desc limit 2返回A和B。 我的SQL2 SEL
select round(836.0)返回836.0 我如何删除sqlite查询中的尾随零。 836.00应该是836 836.440应该是836.44 最佳答案 如果需要836.44,则需要十进制返
我正在研究RQDA中的文本,并且正在使用Firefox SQLite Manager访问数据库,以便可以更轻松地搜索文件。我创建并填充了虚拟表: CREATE VIRTUAL TABLE texts
我有这样的数据: table1 id | part | price 1 | ox900 | 100 2 | ox980 | 200 和 table2 id | part | price 1
我正在尝试将一些数据插入现有的SQLite表中。该表和数据库是使用相同的API创建的,但是由于某种原因,插入操作无效,并且从不给我任何错误消息。 我正在BlackBerry 9550模拟器上对此进行测
例如,我在名为SALARY的列中插入一个值。如果插入的值大于1000,我想将字符串HIGH插入到RANK列中,否则将插入LOW中。 我可以使用SQLite做到吗? 最佳答案 在插入之前使用触发器,然后
假设我有一个包含三列A,B,C的表t1,其中(A,B)包含唯一键(具有数十万行)。由于90%的查询将采用SELECT C FROM t1 WHERE A =?和B = ?,我想我要为A,B和C提供覆盖
在一个SQLite3数据库中,我有一个表“ projects”,其id字段由以下方式组成: [user id]_[user's project id] 例如,用户ID = 45,这是一些数据: 45_
我了解PRAGMA foreign_key和ON DELETE RESTRICT/NO ACTION的概念,但是我面临的是另一种情况。 我需要删除一个父行,但保持与之关联的子行。例如: CREATE
我的c#应用程序从Web服务1读取文件列表,并将完整的文件名插入table1,然后从第二个Web服务读取list并将它们插入到table2。 这些表具有相同的结构,如下所示: create table
我在以下情况下尝试将Record1的ID更新为Record2的ID: 两个表中的名称相同,并且 在Record2中权重更大。 记录1 | ID | Weight | Name | |----|----
我是一名优秀的程序员,十分优秀!