com.j256.ormlite.stmt.Where.isNull()方法的使用及代码示例

x33g5p2x  于2022-02-03 转载在 其他  
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本文整理了Java中com.j256.ormlite.stmt.Where.isNull()方法的一些代码示例，展示了Where.isNull()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。Where.isNull()方法的具体详情如下：
包路径：com.j256.ormlite.stmt.Where
类名称：Where
方法名：isNull

Where.isNull介绍

[英]Add a 'IS NULL' clause so the column must be null. '=' NULL does not work.
[中]添加一个'IS NULL'子句，使列必须为NULL。'='空值不起作用。

代码示例

代码示例来源：origin: org.mycontroller.standalone/mycontroller-core

@Override
public List<Room> getByParentId(Integer parentId) {
  if (parentId == null) {
    try {
      return this.getDao().queryBuilder().where().isNull(Room.KEY_PARENT_ID).query();
    } catch (SQLException ex) {
      _logger.error("unable to get parent", ex);
      return null;
    }
  } else {
    return super.getAll(Room.KEY_PARENT_ID, parentId);
  }
}

代码示例来源：origin: mycontroller-org/mycontroller

@Override
public List<Room> getByParentId(Integer parentId) {
  if (parentId == null) {
    try {
      return this.getDao().queryBuilder().where().isNull(Room.KEY_PARENT_ID).query();
    } catch (SQLException ex) {
      _logger.error("unable to get parent", ex);
      throw new McDatabaseException(ex);
    }
  } else {
    return super.getAll(Room.KEY_PARENT_ID, parentId);
  }
}

代码示例来源：origin: mil.nga.geopackage/geopackage-core

/**
 * Set the foreign key column criteria in the where clause
 * 
 * @param where
 *            where clause
 * @param fileId
 *            file id
 * @param parentId
 *            parent id
 * @throws SQLException
 */
private void setFkWhere(Where<MetadataReference, Void> where, long fileId,
    Long parentId) throws SQLException {
  where.eq(MetadataReference.COLUMN_FILE_ID, fileId);
  if (parentId == null) {
    where.and().isNull(MetadataReference.COLUMN_PARENT_ID);
  } else {
    where.and().eq(MetadataReference.COLUMN_PARENT_ID, parentId);
  }
}

代码示例来源：origin: org.mycontroller.standalone/mycontroller-core

public void updateBulk(String setColName, Object setColValue, String whereColName, Object whereColValue) {
  try {
    UpdateBuilder<Tdao, Tid> updateBuilder = this.getDao().updateBuilder();
    updateBuilder.updateColumnValue(setColName, setColValue);
    if (whereColName != null) {
      if (whereColValue != null) {
        updateBuilder.where().eq(whereColName, whereColValue);
      } else {
        updateBuilder.where().isNull(whereColName);
      }
    }
    Integer updateCount = updateBuilder.update();
    _logger.debug("Updated column[{}] with value[{}] where column[{}] == value[{}], Updated row count:{}",
        setColName, setColValue, whereColName, whereColValue, updateCount);
  } catch (SQLException ex) {
    _logger.error("unable to update column[{}] with value[{}] where column[{}] == value[{}]", setColName,
        setColValue, whereColName, whereColValue, ex);
  }
}

代码示例来源：origin: j256/ormlite-core

@Test
public void testIsNull() throws Exception {
  Where<Foo, String> where = new Where<Foo, String>(createTableInfo(), null, databaseType);
  where.isNull(Foo.VAL_COLUMN_NAME);
  StringBuilder whereSb = new StringBuilder();
  where.appendSql(null, whereSb, new ArrayList<ArgumentHolder>());
  StringBuilder sb = new StringBuilder();
  databaseType.appendEscapedEntityName(sb, Foo.VAL_COLUMN_NAME);
  sb.append(" IS NULL ");
  assertEquals(sb.toString(), whereSb.toString());
}

代码示例来源：origin: org.mycontroller.standalone/mycontroller-core

@Override
public Room getByNameAndParentId(String name, Integer parentId) {
  try {
    QueryBuilder<Room, Integer> queryBuilder = this.getDao().queryBuilder();
    Where<Room, Integer> where = queryBuilder.where();
    int whereCount = 0;
    where.eq(Room.KEY_NAME, name);
    whereCount++;
    if (parentId == null) {
      where.isNull(Room.KEY_PARENT_ID);
    } else {
      where.eq(Room.KEY_PARENT_ID, parentId);
    }
    whereCount++;
    where.and(whereCount);
    queryBuilder.setWhere(where);
    List<Room> rooms = queryBuilder.query();
    if (rooms != null && !rooms.isEmpty()) {
      return rooms.get(0);
    }
  } catch (SQLException ex) {
    _logger.error("unable to get room", ex);
  }
  return null;
}

代码示例来源：origin: mil.nga.geopackage/geopackage-core

where.and().isNull(Extensions.COLUMN_TABLE_NAME);
} else {
  where.and().eq(Extensions.COLUMN_TABLE_NAME, tableName);
  where.and().isNull(Extensions.COLUMN_COLUMN_NAME);
} else {
  where.and().eq(Extensions.COLUMN_COLUMN_NAME, columnName);

代码示例来源：origin: mycontroller-org/mycontroller

public void updateBulk(String setColName, Object setColValue, String whereColName, Object whereColValue) {
  try {
    UpdateBuilder<Tdao, Tid> updateBuilder = this.getDao().updateBuilder();
    updateBuilder.updateColumnValue(setColName, setColValue);
    if (whereColName != null) {
      if (whereColValue != null) {
        updateBuilder.where().eq(whereColName, whereColValue);
      } else {
        updateBuilder.where().isNull(whereColName);
      }
    }
    Integer updateCount = updateBuilder.update();
    _logger.debug("Updated column[{}] with value[{}] where column[{}] == value[{}], Updated row count:{}",
        setColName, setColValue, whereColName, whereColValue, updateCount);
  } catch (SQLException ex) {
    _logger.error("unable to update column[{}] with value[{}] where column[{}] == value[{}]", setColName,
        setColValue, whereColName, whereColValue, ex);
    throw new McDatabaseException(ex);
  }
}

代码示例来源：origin: mycontroller-org/mycontroller

@Override
public Room getByNameAndParentId(String name, Integer parentId) {
  try {
    QueryBuilder<Room, Integer> queryBuilder = this.getDao().queryBuilder();
    Where<Room, Integer> where = queryBuilder.where();
    int whereCount = 0;
    where.eq(Room.KEY_NAME, name);
    whereCount++;
    if (parentId == null) {
      where.isNull(Room.KEY_PARENT_ID);
    } else {
      where.eq(Room.KEY_PARENT_ID, parentId);
    }
    whereCount++;
    where.and(whereCount);
    queryBuilder.setWhere(where);
    List<Room> rooms = queryBuilder.query();
    if (rooms != null && !rooms.isEmpty()) {
      return rooms.get(0);
    }
  } catch (SQLException ex) {
    _logger.error("unable to get room", ex);
    throw new McDatabaseException(ex);
  }
  return null;
}

代码示例来源：origin: annmuor/jnode

break;
case "null":
  wh.isNull(args[i].toString());
  i -= 1;
  break;

代码示例来源：origin: mil.nga.geopackage/geopackage-core

/**
 * Set the unique column criteria in the where clause
 * 
 * @param where
 *            where clause
 * @param constraintName
 *            constraint name
 * @param constraintType
 *            constraint type
 * @param value
 *            value
 * @throws SQLException
 */
private void setUniqueWhere(Where<DataColumnConstraints, Void> where,
    String constraintName, DataColumnConstraintType constraintType,
    String value) throws SQLException {
  where.eq(DataColumnConstraints.COLUMN_CONSTRAINT_NAME, constraintName)
      .and()
      .eq(DataColumnConstraints.COLUMN_CONSTRAINT_TYPE,
          constraintType.getValue());
  if (value == null) {
    where.and().isNull(DataColumnConstraints.COLUMN_VALUE);
  } else {
    where.and().eq(DataColumnConstraints.COLUMN_VALUE, value);
  }
}

代码示例来源：origin: org.mycontroller.standalone/mycontroller-core

@Override
public Settings get(Integer userId, String key, String subKey) {
  try {
    Where<Settings, Integer> where = this.getDao().queryBuilder().where();
    int andCount = 0;
    if (userId == null) {
      where.isNull(Settings.KEY_USER_ID);
      andCount++;
    } else {
      where.eq(Settings.KEY_USER_ID, userId);
      andCount++;
    }
    where.eq(Settings.KEY_KEY, key);
    andCount++;
    where.eq(Settings.KEY_SUB_KEY, subKey);
    andCount++;
    where.and(andCount);
    QueryBuilder<Settings, Integer> queryBuilder = this.getDao().queryBuilder();
    queryBuilder.setWhere(where);
    return queryBuilder.queryForFirst();
  } catch (SQLException ex) {
    _logger.error("unable to get item for userId:{}, key:{}, subKey:{}", userId, key, subKey, ex);
    return null;
  }
}

代码示例来源：origin: mycontroller-org/mycontroller

@Override
public Settings get(Integer userId, String key, String subKey) {
  try {
    Where<Settings, Integer> where = this.getDao().queryBuilder().where();
    int andCount = 0;
    if (userId == null) {
      where.isNull(Settings.KEY_USER_ID);
      andCount++;
    } else {
      where.eq(Settings.KEY_USER_ID, userId);
      andCount++;
    }
    where.eq(Settings.KEY_KEY, key);
    andCount++;
    where.eq(Settings.KEY_SUB_KEY, subKey);
    andCount++;
    where.and(andCount);
    QueryBuilder<Settings, Integer> queryBuilder = this.getDao().queryBuilder();
    queryBuilder.setWhere(where);
    return queryBuilder.queryForFirst();
  } catch (SQLException ex) {
    _logger.error("unable to get item for userId:{}, key:{}, subKey:{}", userId, key, subKey, ex);
    throw new McDatabaseException(ex);
  }
}

代码示例来源：origin: j256/ormlite-core

@Test
public void testNullForeign() throws Exception {
  Dao<OrderOrdered, Integer> orderDao = createDao(OrderOrdered.class, true);
  int numOrders = 10;
  for (int orderC = 0; orderC < numOrders; orderC++) {
    OrderOrdered order = new OrderOrdered();
    order.val = orderC;
    assertEquals(1, orderDao.create(order));
  }
  List<OrderOrdered> results = orderDao.queryBuilder().where().isNull(Order.ACCOUNT_FIELD_NAME).query();
  assertNotNull(results);
  assertEquals(numOrders, results.size());
}

代码示例来源：origin: org.mycontroller.standalone/mycontroller-core

@Override
public Sensor getByRoomId(String sensorName, Integer roomId) {
  try {
    if (roomId == null) {
      return this.getDao().queryForFirst(
          this.getDao().queryBuilder()
              .where().isNull(Sensor.KEY_ROOM_ID)
              .and().eq(Sensor.KEY_NAME, sensorName).prepare());
    } else {
      return this.getDao().queryForFirst(
          this.getDao().queryBuilder()
              .where().eq(Sensor.KEY_ROOM_ID, roomId)
              .and().eq(Sensor.KEY_NAME, sensorName).prepare());
    }
  } catch (SQLException ex) {
    _logger.error("unable to get, roomId:{}, sensorName:{}", roomId, sensorName, ex);
  }
  return null;
}

代码示例来源：origin: mycontroller-org/mycontroller

@Override
public Sensor getByRoomId(String sensorName, Integer roomId) {
  try {
    if (roomId == null) {
      return this.getDao().queryForFirst(
          this.getDao().queryBuilder()
              .where().isNull(Sensor.KEY_ROOM_ID)
              .and().eq(Sensor.KEY_NAME, sensorName).prepare());
    } else {
      return this.getDao().queryForFirst(
          this.getDao().queryBuilder()
              .where().eq(Sensor.KEY_ROOM_ID, roomId)
              .and().eq(Sensor.KEY_NAME, sensorName).prepare());
    }
  } catch (SQLException ex) {
    _logger.error("unable to get, roomId:{}, sensorName:{}", roomId, sensorName, ex);
    throw new McDatabaseException(ex);
  }
}

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

@Test
public void testNullForeign() throws Exception {
  Dao<Order, Integer> orderDao = createDao(Order.class, true);
  int numOrders = 10;
  for (int orderC = 0; orderC < numOrders; orderC++) {
    Order order = new Order();
    order.val = orderC;
    assertEquals(1, orderDao.create(order));
  }
  List<Order> results = orderDao.queryBuilder().where().isNull(Order.ONE_FIELD_NAME).query();
  assertNotNull(results);
  assertEquals(numOrders, results.size());
}

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

@Test
public void testIsNull() throws Exception {
  Dao<Foo, String> fooDao = createTestData();
  QueryBuilder<Foo, String> qb = fooDao.queryBuilder();
  // null fields start off as null so 0 are not-null
  qb.where().isNotNull(Foo.NULL_COLUMN_NAME);
  List<Foo> results = fooDao.query(qb.prepare());
  assertEquals(0, results.size());
  // all are null
  qb.where().isNull(Foo.NULL_COLUMN_NAME);
  results = fooDao.query(qb.prepare());
  assertEquals(2, results.size());
  assertEquals(foo1, results.get(0));
  assertEquals(foo2, results.get(1));
  // set the null fields to not-null
  for (Foo foo : results) {
    foo.nullField = "not null";
    assertEquals(1, fooDao.update(foo));
  }
  // no null results should be found
  qb.where().isNull(Foo.NULL_COLUMN_NAME);
  results = fooDao.query(qb.prepare());
  assertEquals(0, results.size());
  // all are not-null
  qb.where().isNotNull(Foo.NULL_COLUMN_NAME);
  results = fooDao.query(qb.prepare());
  assertEquals(2, results.size());
  assertEquals(foo1, results.get(0));
  assertEquals(foo2, results.get(1));
}

代码示例来源：origin: j256/ormlite-core

@Test
public void testRandomIsNull() throws Exception {
  Dao<SeralizableNull, Integer> dao = createDao(SeralizableNull.class, true);
  SeralizableNull sn1 = new SeralizableNull();
  assertEquals(1, dao.create(sn1));
  SeralizableNull sn2 = new SeralizableNull();
  sn2.serializable = "wow";
  assertEquals(1, dao.create(sn2));
  List<SeralizableNull> results =
      dao.queryBuilder().where().isNull(SeralizableNull.FIELD_NAME_SERIALIZABLE).query();
  assertNotNull(results);
  assertEquals(1, results.size());
  assertEquals(sn1.id, results.get(0).id);
  results = dao.queryBuilder().where().isNotNull(SeralizableNull.FIELD_NAME_SERIALIZABLE).query();
  assertNotNull(results);
  assertEquals(1, results.size());
  assertEquals(sn2.id, results.get(0).id);
}

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