我已经从 Android 中的 SQLite
数据库填充了 ListView
。当我运行应用程序 ListView 时,它没有填充数据 - 它是空的。即使我也关闭了 Cursor
,我也会收到 DataBaseObjectNotClosedException
异常。谁能看出我的错误在哪里?
这是我的日志文件:
07-15 14:46:45.372: E/Database(18100): close() was never explicitly called on database '/data/data/com.sqlitedemo/databases/EmployeeReview.db'
07-15 14:46:45.372: E/Database(18100): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
07-15 14:46:45.372: E/Database(18100): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1847)
07-15 14:46:45.372: E/Database(18100): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
07-15 14:46:45.372: E/Database(18100): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
07-15 14:46:45.372: E/Database(18100): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
07-15 14:46:45.372: E/Database(18100): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:544)
07-15 14:46:45.372: E/Database(18100): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
07-15 14:46:45.372: E/Database(18100): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
07-15 14:46:45.372: E/Database(18100): at com.sqlitedemo.Employee_List.showList(Employee_List.java:148)
07-15 14:46:45.372: E/Database(18100): at com.sqlitedemo.Employee_List.onCreate(Employee_List.java:63)
07-15 14:46:45.372: E/Database(18100): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-15 14:46:45.372: E/Database(18100): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
07-15 14:46:45.372: E/Database(18100): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
07-15 14:46:45.372: E/Database(18100): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-15 14:46:45.372: E/Database(18100): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
07-15 14:46:45.372: E/Database(18100): at android.os.Handler.dispatchMessage(Handler.java:99)
07-15 14:46:45.372: E/Database(18100): at android.os.Looper.loop(Looper.java:123)
07-15 14:46:45.372: E/Database(18100): at android.app.ActivityThread.main(ActivityThread.java:3683)
07-15 14:46:45.372: E/Database(18100): at java.lang.reflect.Method.invokeNative(Native Method)
07-15 14:46:45.372: E/Database(18100): at java.lang.reflect.Method.invoke(Method.java:507)
07-15 14:46:45.372: E/Database(18100): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-15 14:46:45.372: E/Database(18100): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-15 14:46:45.372: E/Database(18100): at dalvik.system.NativeStart.main(Native Method)
这是我在 Activity 类中的方法
private void showList()
{
ArrayList<Employee> EmployeeList = new ArrayList<Employee>();
EmployeeList.clear();
String strQuery = "SELECT sum(empid) as emp_id, Staff_emp_name as emp_name, department as emp_dept, designation as emp_designation,"
+" (SUM(performance_rate_one+performance_rate_two+performance_rate_three+performance_rate_four+performance_rate_five)/5) as TotalPerformance"
+" FROM employee_details INNER JOIN performance"
+" ON employee_details.Emp_id = performance.empid "
+" GROUP BY empid "
+" ORDER BY TotalPerformance DESC";
SQLiteDatabase sqlDatabase = databaseHelper.getWritableDatabase();
Cursor c1 =sqlDatabase.rawQuery(strQuery, null);
if (c1 != null && c1.getCount() != 0)
{
if (c1.moveToFirst())
{
do
{
Employee EmployeeListItems = new Employee();
EmployeeListItems.setEmployeeId(c1.getInt(c1.getColumnIndex("emp_id")));
EmployeeListItems.setName(c1.getString(c1.getColumnIndex("emp_name")));
EmployeeListItems.setDepartment(c1.getString(c1.getColumnIndex("emp_dept")));
EmployeeListItems.setDesignation(c1.getString(c1.getColumnIndex("emp_designation")));
EmployeeListItems.setPerformancerate(c1.getString(c1.getColumnIndex("TotalPerformance")));
EmployeeList.add(EmployeeListItems);
} while (c1.moveToNext());
}
startManagingCursor(c1);
sqlDatabase.close();
c1.close();
}
EmployeeList_Adapter contactListAdapter = new EmployeeList_Adapter(Employee_List.this, EmployeeList);
listEmployee.setAdapter(contactListAdapter);
contactListAdapter.notifyDataSetChanged();
}
我在线路上遇到错误
SQLiteDatabase sqlDatabase = databaseHelper.getWritableDatabase();
Cursor c1 =sqlDatabase.rawQuery(strQuery, null);
最佳答案
sqlDatabase.close();
c1.close();
将会是 -
c1.close();
sqlDatabase.close();
关于java - Android中的Sqlite : DataBaseObjectNotClosedException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24754443/