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Android 发布时间：2022-04-28 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了android – 使用SQLite数据库时的几个异常，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

这段代码：

public void foo() {
    new Thread() {
        @Override
        public void run() {
            ShaufelDatabaseHelper dbHelper = ShaufelDatabaseHelper.geTinstance(parentActivity);
            sqliteDatabase connection = null;
            cursor queryData = null;

            final String[] values = new String[8];

            try{
                connection = dbHelper.getReadableDatabase();

                queryData = connection.rawQuery(         // line 132
                    "SELECT name,firstname,section,row,gravenr,type,workorder,comment "+
                    "FROM orders,graves "+
                    "WHERE orders.id=? AND graves.id=orders.id",new String[] {orderID});

                queryData.moveToFirst(); // line 138

                // ...
        } catch(Throwable t) {
            // ...
        }
    }.start();
}

给我这些例外：

10-29 15:19:55.103: E/AndroidRuntime(23102): FATAL EXCEPTION: Thread-1387
10-29 15:19:55.103: E/AndroidRuntime(23102): java.lang.IllegalMonitorStateException
10-29 15:19:55.103: E/AndroidRuntime(23102):    at java.util.concurrent.locks.reentrantlock$Sync.tryRelease(reentrantlock.java:126)
10-29 15:19:55.103: E/AndroidRuntime(23102):    at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1239)
10-29 15:19:55.103: E/AndroidRuntime(23102):    at java.util.concurrent.locks.reentrantlock.unlock(reentrantlock.java:431)
10-29 15:19:55.103: E/AndroidRuntime(23102):    at android.database.sqlite.sqliteDatabase.unlock(sqliteDatabase.java:487)
10-29 15:19:55.103: E/AndroidRuntime(23102):    at android.database.sqlite.sqliteDirectcursorDriver.query(sqliteDirectcursorDriver.java:62)
10-29 15:19:55.103: E/AndroidRuntime(23102):    at android.database.sqlite.sqliteDatabase.rawQueryWithFactory(sqliteDatabase.java:1564)
10-29 15:19:55.103: E/AndroidRuntime(23102):    at android.database.sqlite.sqliteDatabase.rawQuery(sqliteDatabase.java:1538)
10-29 15:19:55.103: E/AndroidRuntime(23102):    at de.l_one.app.shaufel.orderDetailView$3.run(OrderDetailView.java:132)

10-29 15:21:07.953: E/sqliteQuery(23133): exception: library routIne called out of sequence; query: SELECT name,comment FROM orders,graves WHERE orders.id=? AND graves.id=orders.id
10-29 15:21:07.953: E/sql order detail(23133): android.database.sqlite.sqliteMisuseException: library routIne called out of sequence
10-29 15:21:07.953: E/sql order detail(23133): android.database.sqlite.sqliteMisuseException: library routIne called out of sequence
10-29 15:21:07.953: E/sql order detail(23133):  at android.database.sqlite.sqliteQuery.nativeFillWindow(Native Method)
10-29 15:21:07.953: E/sql order detail(23133):  at android.database.sqlite.sqliteQuery.fillWindow(sqliteQuery.java:86)
10-29 15:21:07.953: E/sql order detail(23133):  at android.database.sqlite.sqlitecursor.fillWindow(sqlitecursor.java:164)
10-29 15:21:07.953: E/sql order detail(23133):  at android.database.sqlite.sqlitecursor.getCount(sqlitecursor.java:156)
10-29 15:21:07.953: E/sql order detail(23133):  at android.database.Abstractcursor.moveToPosition(Abstractcursor.java:161)
10-29 15:21:07.953: E/sql order detail(23133):  at android.database.Abstractcursor.moveToFirst(Abstractcursor.java:201)
10-29 15:21:07.953: E/sql order detail(23133):  at de.l_one.app.shaufel.orderDetailView$3.run(OrderDetailView.java:138)

10-29 15:22:52.983: E/AndroidRuntime(23133): FATAL EXCEPTION: Thread-1411
10-29 15:22:52.983: E/AndroidRuntime(23133): java.lang.IllegalStateException: database /data/data/de.l_one.app.shaufel/databases/poidatabase (conn# 0) already closed
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteDatabase.verifyDbIsOpen(sqliteDatabase.java:2082)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteCompiledsql.<init>(sqliteCompiledsql.java:58)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteProgram.compilesql(sqliteProgram.java:143)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteProgram.compileAndbindAllArgs(sqliteProgram.java:361)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteProgram.<init>(sqliteProgram.java:127)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteProgram.<init>(sqliteProgram.java:94)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteQuery.<init>(sqliteQuery.java:53)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteDirectcursorDriver.query(sqliteDirectcursorDriver.java:47)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteDatabase.rawQueryWithFactory(sqliteDatabase.java:1564)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at android.database.sqlite.sqliteDatabase.rawQuery(sqliteDatabase.java:1538)
10-29 15:22:52.983: E/AndroidRuntime(23133):    at de.l_one.app.shaufel.orderDetailView$3.run(OrderDetailView.java:132)

这些不会在一次运行中抛出,而是(似乎是)随机抛出.抛出Exception时没有模式,有时根本不会抛出Exception.
我在我的应用程序中使用相同的方法,它没有任何问题.我没有最小的线索来自IllegalStateException,因为数据库没有关闭,至少不是我. (根据SO的一些答案,这是正常的,在某些情况下甚至比手动关闭你的dbs更好).

代码注释：
ShaufelDatabaseHelper是一个扩展sqliteOpenHelper的Singleton.它用于一般工作的不同活动,这似乎是唯一的例外.

我刚刚在第二台设备上测试过,没有抛出任何异常,一切正常.
抛出Exceptions的设备是运行android 4.0.3的lenovo thinkpad.
没有Exceptions运行的是运行Android 2.3.4的HTC Sensation Z710e.

有谁知道这会导致什么？

E：我不知道它是否有帮助但是在sqliteMisuseException之前记录了这个：

10-29 16:07:46.530: I/sqliteDatabaseCpp(23728): sqlite returned: error code = 21,msg = API called with NULL prepared statement,db=/data/data/de.l_one.app.shaufel/databases/poidatabase
10-29 16:07:46.530: I/sqliteDatabaseCpp(23728): sqlite returned: error code = 21,msg = misuse at line 58929 of [8609a15dfa],msg = API call with invalid database connection pointer,msg = misuse at line 106340 of [8609a15dfa],msg = misuse at line 106271 of [8609a15dfa],db=/data/data/de.l_one.app.shaufel/databases/poidatabase

解决方法

原因

如果有任何机会,另一个线程在你调用getReadableDatabase()和rawQuery()之间或者在执行rawQuery()期间关闭了数据库,你将得到这个异常.这是因为您的sqliteOpenHelper是一个单例(它应该是),这意味着如果某个其他线程关闭了数据库,则将关闭保存数据库连接的单个内部mDatabase成员.

我的建议：

为您的sqliteOpenHelper派生实现自己的close()方法.在您的实现中,在实际关闭之前检查已打开连接的引用计数(调用 sqliteOpenHelper.close()).

privatE int openedConnections = 0;
//...
public synchronized sqliteDatabase getReadableDatabase() {
    openedConnections++;
    getReadableDatabase();
}

public synchronized void close() {
    openedConnections--;
    if (openedConnections == 0) {
        close();
    }
}

让我知道它是否有效！

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