com.j256.ormlite.dao.Dao.iterator()方法的使用及代码示例

x33g5p2x  于2022-01-18 转载在 其他  
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本文整理了Java中com.j256.ormlite.dao.Dao.iterator()方法的一些代码示例，展示了Dao.iterator()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Dao.iterator()方法的具体详情如下：
包路径：com.j256.ormlite.dao.Dao
类名称：Dao
方法名：iterator

Dao.iterator介绍

[英]This satisfies the Iterable interface for the class and allows you to iterate through the objects in the table using SQL. You can use code similar to the following:

  1. for (Account account : accountDao) { ... }

WARNING: because the Iterator#hasNext(), Iterator#next(), etc. methods can only throw RuntimeException, the code has to wrap any SQLException with IllegalStateException. Make sure to catch IllegalStateException and look for a SQLException cause.

WARNING: The underlying results object will only be closed if you page all the way to the end of the iterator using the for() loop or if you call CloseableIterator#close() directly. You can also call the #closeLastIterator() if you are not iterating across this DAO in multiple threads.

NOTE: With this iterator you can only move forward through the object collection. See the #iterator(int) method to create a cursor that can go both directions.
[中]这满足了类的Iterable接口，并允许您使用SQL迭代表中的对象。您可以使用类似于以下内容的代码：

  1. for (Account account : accountDao) { ... }

警告：由于迭代器#hasNext（）、迭代器#next（）等方法只能抛出RuntimeException，因此代码必须用IllegalStateException包装任何SQLException。确保捕获IllegalStateException并查找SQLException原因。
警告：只有使用for（）循环将页面一直分页到迭代器的末尾，或者直接调用CloseableIterator#close（）时，基础结果对象才会关闭。如果没有在多个线程中迭代此DAO，也可以调用#closeLastIterator（）。
注意：使用此迭代器，您只能在对象集合中前进。请参阅#迭代器（int）方法来创建可以双向移动的游标。

代码示例

代码示例来源：origin: j256/ormlite-core

  1. /**
  2.  * @see Dao#iterator(int)
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator(int resultFlags) {
  6.   return dao.iterator(resultFlags);
  7. }

代码示例来源：origin: com.j256.ormlite/ormlite-core

  1. /**
  2.  * @see Dao#iterator()
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator() {
  6.   return dao.iterator();
  7. }

代码示例来源：origin: j256/ormlite-core

  1. /**
  2.  * @see Dao#iterator()
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator() {
  6.   return dao.iterator();
  7. }

代码示例来源：origin: com.j256.ormlite/ormlite-core

  1. /**
  2.  * @see Dao#iterator(int)
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator(int resultFlags) {
  6.   return dao.iterator(resultFlags);
  7. }

代码示例来源：origin: j256/ormlite-core

  1. /**
  2.  * A short cut to {@link Dao#iterator(PreparedQuery)}.
  3.  */
  4. public CloseableIterator<T> iterator() throws SQLException {
  5.   return dao.iterator(prepare());
  6. }

代码示例来源：origin: j256/ormlite-core

  1. /**
  2.  * @see Dao#iterator(PreparedQuery)
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator(PreparedQuery<T> preparedQuery) {
  6.   try {
  7.     return dao.iterator(preparedQuery);
  8.   } catch (SQLException e) {
  9.     logMessage(e, "iterator threw exception on: " + preparedQuery);
  10.     throw new RuntimeException(e);
  11.   }
  12. }

代码示例来源：origin: j256/ormlite-core

  1. /**
  2.  * @see Dao#iterator(PreparedQuery, int)
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator(PreparedQuery<T> preparedQuery, int resultFlags) {
  6.   try {
  7.     return dao.iterator(preparedQuery, resultFlags);
  8.   } catch (SQLException e) {
  9.     logMessage(e, "iterator threw exception on: " + preparedQuery);
  10.     throw new RuntimeException(e);
  11.   }
  12. }

代码示例来源：origin: com.j256.ormlite/ormlite-core

  1. /**
  2.  * @see Dao#iterator(PreparedQuery)
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator(PreparedQuery<T> preparedQuery) {
  6.   try {
  7.     return dao.iterator(preparedQuery);
  8.   } catch (SQLException e) {
  9.     logMessage(e, "iterator threw exception on: " + preparedQuery);
  10.     throw new RuntimeException(e);
  11.   }
  12. }

代码示例来源：origin: com.j256.ormlite/ormlite-core

  1. /**
  2.  * A short cut to {@link Dao#iterator(PreparedQuery)}.
  3.  */
  4. public CloseableIterator<T> iterator() throws SQLException {
  5.   return dao.iterator(prepare());
  6. }

代码示例来源：origin: com.j256.ormlite/ormlite-core

  1. /**
  2.  * @see Dao#iterator(PreparedQuery, int)
  3.  */
  4. @Override
  5. public CloseableIterator<T> iterator(PreparedQuery<T> preparedQuery, int resultFlags) {
  6.   try {
  7.     return dao.iterator(preparedQuery, resultFlags);
  8.   } catch (SQLException e) {
  9.     logMessage(e, "iterator threw exception on: " + preparedQuery);
  10.     throw new RuntimeException(e);
  11.   }
  12. }

代码示例来源：origin: j256/ormlite-core

  1. @Test(expected = RuntimeException.class)
  2. public void testIteratorThrow() throws Exception {
  3.   @SuppressWarnings("unchecked")
  4.   Dao<Foo, String> dao = (Dao<Foo, String>) createMock(Dao.class);
  5.   RuntimeExceptionDao<Foo, String> rtDao = new RuntimeExceptionDao<Foo, String>(dao);
  6.   expect(dao.iterator(null)).andThrow(new SQLException("Testing catch"));
  7.   replay(dao);
  8.   rtDao.iterator(null);
  9.   verify(dao);
  10. }

代码示例来源：origin: com.j256.ormlite/ormlite-jdbc

  1. @Test
  2. public void testIteratorNoResults() throws Exception {
  3.   Dao<Foo, Integer> fooDao = createDao(Foo.class, true);
  4.   Iterator<Foo> iterator = fooDao.iterator();
  5.   assertFalse(iterator.hasNext());
  6. }

代码示例来源：origin: com.j256.ormlite/ormlite-jdbc

  1. @Test
  2. public void testRemoveAfterDone() throws Exception {
  3.   Dao<Foo, Integer> fooDao = createDao(Foo.class, true);
  4.   Iterator<Foo> iterator = fooDao.iterator();
  5.   assertFalse(iterator.hasNext());
  6.   try {
  7.     iterator.remove();
  8.     fail("expected exception");
  9.   } catch (IllegalStateException e) {
  10.     // expected
  11.   }
  12. }

代码示例来源：origin: j256/ormlite-core

  1. @Test(expected = IllegalStateException.class)
  2. public void testIteratorRemoveNoNext() throws Exception {
  3.   Dao<Foo, Object> dao = createDao(Foo.class, true);
  4.   CloseableIterator<Foo> iterator = dao.iterator();
  5.   try {
  6.     iterator.remove();
  7.   } finally {
  8.     iterator.close();
  9.   }
  10. }

代码示例来源：origin: com.j256.ormlite/ormlite-jdbc

  1. @Test
  2. public void testHasNextAfterDone() throws Exception {
  3.   Dao<Foo, Integer> fooDao = createDao(Foo.class, true);
  4.   CloseableIterator<Foo> iterator = fooDao.iterator();
  5.   try {
  6.     while (iterator.hasNext()) {
  7.     }
  8.     assertFalse(iterator.hasNext());
  9.   } finally {
  10.     iterator.close();
  11.   }
  12. }

代码示例来源：origin: j256/ormlite-core

  1. @Test
  2. public void testIteratorGetRawResults() throws Exception {
  3.   Dao<Foo, Integer> dao = createDao(Foo.class, true);
  4.   Foo foo1 = new Foo();
  5.   assertEquals(1, dao.create(foo1));
  6.   assertEquals(1, dao.queryForAll().size());
  7.   @SuppressWarnings("unchecked")
  8.   SelectIterator<Foo, String> iterator = (SelectIterator<Foo, String>) dao.iterator();
  9.   DatabaseResults results = iterator.getRawResults();
  10.   assertTrue(results.next());
  11.   iterator.close();
  12. }

代码示例来源：origin: j256/ormlite-core

  1. @Test(expected = IllegalStateException.class)
  2. public void testIteratorThrow() throws Exception {
  3.   Dao<Foo, Integer> dao = createDao(Foo.class, true);
  4.   Foo foo = new Foo();
  5.   assertEquals(1, dao.create(foo));
  6.   DatabaseConnection conn = connectionSource.getReadWriteConnection(FOO_TABLE_NAME);
  7.   try {
  8.     conn.close();
  9.     dao.iterator();
  10.   } finally {
  11.     connectionSource.releaseConnection(conn);
  12.   }
  13. }

代码示例来源：origin: j256/ormlite-core

  1. @Test(expected = SQLException.class)
  2. public void testIteratorPreparedThrow() throws Exception {
  3.   Dao<Foo, Integer> dao = createDao(Foo.class, true);
  4.   Foo foo = new Foo();
  5.   assertEquals(1, dao.create(foo));
  6.   DatabaseConnection conn = connectionSource.getReadWriteConnection(FOO_TABLE_NAME);
  7.   try {
  8.     conn.close();
  9.     dao.iterator(dao.queryBuilder().prepare());
  10.   } finally {
  11.     connectionSource.releaseConnection(conn);
  12.   }
  13. }

代码示例来源：origin: j256/ormlite-core

  1. @Test
  2. public void testIteratorLastClose() throws Exception {
  3.   Dao<Foo, Integer> dao = createDao(Foo.class, true);
  4.   Foo foo1 = new Foo();
  5.   assertEquals(1, dao.create(foo1));
  6.   CloseableIterator<Foo> iterator = dao.iterator();
  7.   assertTrue(iterator.hasNext());
  8.   Foo foo3 = iterator.next();
  9.   assertEquals(foo1.id, foo3.id);
  10.   assertFalse(iterator.hasNext());
  11.   dao.closeLastIterator();
  12. }

代码示例来源：origin: j256/ormlite-core

  1. @Test
  2. public void testMultipleHasNext() throws Exception {
  3.   Dao<Foo, Integer> dao = createDao(Foo.class, true);
  4.   Foo foo1 = new Foo();
  5.   assertEquals(1, dao.create(foo1));
  6.   CloseableIterator<Foo> iterator = dao.iterator();
  7.   assertTrue(iterator.hasNext());
  8.   assertTrue(iterator.hasNext());
  9.   assertTrue(iterator.hasNext());
  10.   iterator.moveToNext();
  11.   assertFalse(iterator.hasNext());
  12. }

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