Android Sqlite无法提取数据
我正在阅读我的表格,但我无法启动应用程序,因为它会给我这些错误: 下面是连接到dbclass的te代码。它调用DBclass中的id方法,然后关闭数据库Android Sqlite无法提取数据,android,sqlite,cursor,Android,Sqlite,Cursor,我正在阅读我的表格,但我无法启动应用程序,因为它会给我这些错误: 下面是连接到dbclass的te代码。它调用DBclass中的id方法,然后关闭数据库 public int return_id_phone(Context contxt) { Database db = new Database(contxt); db.open(); int id_phone = db.id(2); db.close(); return id_phone; } 下面是要
public int return_id_phone(Context contxt) {
Database db = new Database(contxt);
db.open();
int id_phone = db.id(2);
db.close();
return id_phone;
}
下面是要提取的代码。只返回一个数字它很简单,我不知道为什么它会崩溃。它在下面的错误中说,我没有关闭光标,数据库也被锁定
public int id(int row) {
String[] columns = new String[] { ID_ROW, VALUE_ROW };
Cursor c = ourDatabase.query(DATABASE_TABLE_2, columns, ID_ROW + "='"
+ row+"'", null, null, null, null);
if (c != null) {
c.moveToFirst();
int id= c.getInt(1);
c.close();
return id;
} else {
c.close();
return 0;
}
}
我不知道我做错了什么
> 07-09 11:54:05.460: E/SQLiteDatabase(6938): close() was never explicitly called on database '/data/data/com.anonyme.app/databases/faraway'
07-09 11:54:05.460: E/SQLiteDatabase(6938): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:2069)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1123)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1081)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1167)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:833)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:221)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at com.background.Database.open(Database.java:89)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at com.extract.Contacts.phoneandname(Contacts.java:124)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at com.anonyme.app.IntroActivity.uploadall(IntroActivity.java:85)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at com.anonyme.app.IntroActivity.onCreate(IntroActivity.java:76)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.Activity.performCreate(Activity.java:4465)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.ActivityThread.access$600(ActivityThread.java:127)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.os.Handler.dispatchMessage(Handler.java:99)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.os.Looper.loop(Looper.java:137)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at android.app.ActivityThread.main(ActivityThread.java:4507)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at java.lang.reflect.Method.invokeNative(Native Method)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at java.lang.reflect.Method.invoke(Method.java:511)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
07-09 11:54:05.460: E/SQLiteDatabase(6938): at dalvik.system.NativeStart.main(Native Method)
07-09 11:54:05.460: E/System(6938): Uncaught exception thrown by finalizer
07-09 11:54:05.465: E/System(6938): java.lang.IllegalStateException: Don't have database lock!
07-09 11:54:05.465: E/System(6938): at android.database.sqlite.SQLiteDatabase.verifyLockOwner(SQLiteDatabase.java:2227)
07-09 11:54:05.465: E/System(6938): at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2319)
07-09 11:54:05.465: E/System(6938): at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2315)
07-09 11:54:05.465: E/System(6938): at android.util.LruCache.trimToSize(LruCache.java:197)
07-09 11:54:05.465: E/System(6938): at android.util.LruCache.evictAll(LruCache.java:285)
07-09 11:54:05.465: E/System(6938): at android.database.sqlite.SQLiteDatabase.deallocCachedSqlStatements(SQLiteDatabase.java:2280)
07-09 11:54:05.465: E/System(6938): at android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:1252)
07-09 11:54:05.465: E/System(6938): at android.database.sqlite.SQLiteDatabase.finalize(SQLiteDatabase.java:2040)
07-09 11:54:05.465: E/System(6938): at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:182)
07-09 11:54:05.465: E/System(6938): at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
07-09 11:54:05.465: E/System(6938): at java.lang.Thread.run(Thread.java:856)
>07-09 11:54:05.460:E/SQLiteDatabase(6938):从未在数据库“/data/data/com.anonyme.app/databases/faraway”上显式调用close()
07-09 11:54:05.460:E/SQLiteDatabase(6938):android.database.sqlite.DatabaseObjectNotClosedException:应用程序未关闭在此打开的光标或数据库对象
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.database.sqlite.SQLiteDatabase.(SQLiteDatabase.java:2069)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1123)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1081)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1167)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:833)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:221)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.database.sqlite.SQLiteOpenHelper.getwriteabledatabase(SQLiteOpenHelper.java:157)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于com.background.Database.open(Database.java:89)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于com.extract.Contacts.phoneandname(Contacts.java:124)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于com.anonyme.app.IntroActivity.uploadall(IntroActivity.java:85)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于com.anonomine.app.IntroActivity.onCreate(IntroActivity.java:76)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.Activity.performCreate(Activity.java:4465)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.ActivityThread.access$600(ActivityThread.java:127)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.os.Handler.dispatchMessage(Handler.java:99)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.os.Looper.loop(Looper.java:137)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于android.app.ActivityThread.main(ActivityThread.java:4507)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于java.lang.reflect.Method.invokenactive(本机方法)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于java.lang.reflect.Method.invoke(Method.java:511)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
07-09 11:54:05.460:E/SQLiteDatabase(6938):位于dalvik.system.NativeStart.main(本机方法)
07-09 11:54:05.460:E/System(6938):终结器引发的未捕获异常
07-09 11:54:05.465:E/System(6938):java.lang.IllegalStateException:没有数据库锁!
07-09 11:54:05.465:E/System(6938):位于android.database.sqlite.SQLiteDatabase.verifyLockOwner(SQLiteDatabase.java:2227)
07-09 11:54:05.465:E/System(6938):在android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2319)
07-09 11:54:05.465:E/System(6938):在android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2315)
07-09 11:54:05.465:E/System(6938):位于android.util.LruCache.trimToSize(LruCache.java:197)
07-09 11:54:05.465:E/System(6938):在android.util.LruCache.executeAll(LruCache.java:285)
07-09 11:54:05.465:E/System(6938):在android.database.sqlite.SQLiteDatabase.deallocachedsqlstatements(SQLiteDatabase.java:2280)
07-09 11:54:05.465:E/System(6938):位于android.database.sqlite.SQLiteDatabase.closecloseable(SQLiteDatabase.java:1252)
07-09 11:54:05.465:E/System(6938):在android.database.sqlite.SQLiteDatabase.finalize(SQLiteDatabase.java:2040)
07-09 11:54:05.465:E/System(6938):位于java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:182)
07-09 11:54:05.465:E/System(6938):位于java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
07-09 11:54:05.465:E/System(6938):在java.lang.Thread.run(Thread.java:856)
尝试以下代码:
public int id(int row) {
String[] columns = new String[] { ID_ROW, VALUE_ROW };
try {
Cursor c = ourDatabase.query(DATABASE_TABLE_2, columns, ID_ROW + "='"
+ row+"'", null, null, null, null);
if (c != null) {
c.moveToFirst();
int id= c.getInt(1);
return id;
} else {
return 0;
}
} finally {
c.close();
}
}
我看到了一些事情。。。首先,在查询中将整数视为字符串(删除引号以修复此问题) 其次,游标可以为空而不为null,因此您应该更改检查以查找0记录计数 试试这个:
public int id(int row) {
String[] columns = new String[] { ID_ROW, VALUE_ROW };
Cursor c = ourDatabase.query(DATABASE_TABLE_2, columns, ID_ROW + "= "
+ row, null, null, null, null);
if (c.getcount() != 0) {
c.moveToFirst();
int id= c.getInt(1);
c.close();
return id;
} else {
c.close();
return 0;
}
}
我只是看了你发布的代码,而不是日志。很抱歉虽然您发布的代码有问题(正如我在回答中指出的),但它与LogCat中报告的错误无关。您需要检查
LruCache.trimToSize(LruCache.java:197)”和LruCache.executeAll(LruCache.java:285)`是否有错误。可能试图在数据库未打开时对其执行某些操作?