com.holonplatform.core.query.Query类的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中com.holonplatform.core.query.Query类的一些代码示例，展示了Query类的具体用法。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。Query类的具体详情如下：
包路径：com.holonplatform.core.query.Query
类名称：Query

Query介绍

[英]Represents a query, which can be used to configure and execute a query on the data managed by a Datastore.

The query is configured through the QueryBuilder API and executed using the QueryResults API, which provides methods to execute the query and obtain the results using a QueryProjection to specify the expected result type.

Extends DatastoreCommodity to allow query definition and registration using the Datastore commodities paradigm.
[中]表示查询，可用于配置和执行对数据存储管理的数据的查询。
查询是通过QueryBuilder API配置的，并使用QueryResults API执行，该API提供了执行查询和使用QueryProjection获取结果的方法，以指定预期的结果类型。
扩展DatastoreCommodity以允许使用Datastore commodities范例进行查询定义和注册。

代码示例

代码示例来源：origin: com.holon-platform.jdbc/documentation-datastore-jdbc

public void where1() {
  // tag::where1[]
  QueryFilter whereFilter = WhereFilter.create("name='John'"); // <1>
  Stream<Long> results = getDatastore().query().target(TARGET).filter(whereFilter).stream(ID); // <2>
  // end::where1[]
}

代码示例来源：origin: com.holon-platform.core/documentation-core

public void queryResults() {
  // tag::queryresults[]
  final NumericProperty<Integer> PROPERTY1 = NumericProperty.integerType("test1");
  final StringProperty PROPERTY2 = StringProperty.create("test2");
  final PropertySet<?> PROPERTIES = PropertySet.of(PROPERTY1, PROPERTY2);
  final DataTarget<?> TARGET = DataTarget.named("testTarget");
  Datastore datastore = getDatastore(); // build or obtain a concrete Datastore implementation
  long count = datastore.query().target(TARGET).count(); // <1>
  Stream<Integer> values = datastore.query(TARGET).stream(PROPERTY1); // <2>
  Optional<Integer> value = datastore.query(TARGET).findOne(PROPERTY1); // <3>
  Stream<PropertyBox> results = datastore.query(TARGET).stream(PROPERTY1, PROPERTY2); // <4>
  results = datastore.query(TARGET).stream(PROPERTIES); // <5>
  List<PropertyBox> list = datastore.query(TARGET).list(PROPERTY1, PROPERTY2); // <6>
  Optional<PropertyBox> result = datastore.query(TARGET).findOne(PROPERTY1, PROPERTY2); // <7>
  // end::queryresults[]
}

代码示例来源：origin: com.holon-platform.jpa/documentation-datastore-jpa

void operations() {
  // tag::model3[]
  Datastore datastore = getJpaDatastore();
  Stream<Long> ids = datastore.query().target(TARGET).filter(ID.gt(0L)).sort(VALUE.asc()).stream(ID); // <1>
  Stream<PropertyBox> results = datastore.query().target(TARGET).filter(ID.gt(0L)).sort(VALUE.asc()).stream(TEST); // <2>
  PropertyBox valueToSave = PropertyBox.builder(TEST).set(ID, 1L).set(VALUE, "test").build();
  datastore.save(TARGET, valueToSave); // <3>
  // end::model3[]
}

代码示例来源：origin: com.holon-platform.vaadin7/holon-vaadin

@Override
public Stream<PropertyBox> load(QueryConfigurationProvider configuration, int offset, int limit)
    throws DataAccessException {
  Query q = buildQuery(configuration, true);
  // paging
  if (limit > 0) {
    q.limit(limit);
    q.offset(offset);
  }
  // execute
  return q.stream(propertySet);
}

代码示例来源：origin: com.holon-platform.jdbc/documentation-datastore-jdbc

public void orderby() {
  // tag::orderby[]
  QuerySort orderBySort = OrderBySort.create("id asc, name desc"); // <1>
  Stream<Long> results = getDatastore().query().target(TARGET).sort(orderBySort).stream(ID); // <2>
  // end::orderby[]
}

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin

q.target(getTarget());
QueryFilter.allOf(filters).ifPresent(f -> q.filter(f));
      q.sort(sorts.get(0));
    } else {
      q.sort(QuerySort.of(sorts));
  ParameterSet parameters = p.getQueryParameters();
  if (parameters != null) {
    parameters.forEachParameter((n, v) -> q.parameter(n, v));
  q.limit(query.getLimit());
  q.offset(query.getOffset());

代码示例来源：origin: com.holon-platform.core/documentation-core

public void queryDefinition() {
  // tag::querydefinition[]
  final PathProperty<Integer> PROPERTY = PathProperty.create("test", Integer.class);
  Datastore datastore = getDatastore(); // build or obtain a Datastore
  Query query = datastore.query() // <1>
      .target(DataTarget.named("testTarget")) // <2>
      .filter(PROPERTY.gt(10)) // <3>
      .sort(PROPERTY.asc()) // <4>
      .aggregate(PROPERTY) // <5>
      .limit(100) // <6>
      .offset(200); // <7>
  query = datastore.query(DataTarget.named("testTarget")) // <8>
      .aggregate(QueryAggregation.builder().path(PROPERTY).filter(PROPERTY.gt(10)).build()) // <9>
      .restrict(100, 200); // <10>
  // end::querydefinition[]
}

代码示例来源：origin: com.holon-platform.vaadin7/holon-vaadin

q.target(getTarget());
q.filter(filter);
QuerySort sort = configuration.getQuerySort();
if (sort != null) {
  q.sort(sort);
parameters.forEachParameter((n, v) -> q.parameter(n, v));

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin

@SuppressWarnings({ "rawtypes", "unchecked" })
protected <P extends Property<?>> void setupItemConverter(Datastore datastore, DataTarget<?> dataTarget,
    Iterable<P> properties) {
  if (selectProperty != null && PathProperty.class.isAssignableFrom(selectProperty.getClass())
      && !getInstance().getItemConverter().isPresent()) {
    itemConverter(value -> {
      if (value != null) {
        return datastore.query().target(dataTarget).filter(((PathProperty) selectProperty).eq(value))
            .findOne(properties).orElse(null);
      }
      return null;
    });
  }
}

代码示例来源：origin: com.holon-platform.jpa/documentation-datastore-jpa

public void expressionResolverRegistration() {
  // tag::expreg1[]
  Datastore datastore = JpaDatastore.builder() //
      .withExpressionResolver(new MyExpressionResolver()) // <1>
      .build();
  // end::expreg1[]
  // tag::expreg2[]
  datastore.addExpressionResolver(new MyExpressionResolver()); // <1>
  // end::expreg2[]
  // tag::expreg3[]
  long result = datastore.query().target(DataTarget.named("Test")) //
      .withExpressionResolver(new MyExpressionResolver()) // <1>
      .count();
  // end::expreg3[]
}

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin-flow

/**
 * Setup a item converter function if the current item converter is a {@link PropertyItemConverter}, using the
 * selection property to retrieve an item.
 * @param datastore The datastore
 * @param target The query target
 * @param propertySet The query projection
 */
protected void setupDatastoreItemConverter(Datastore datastore, DataTarget<?> target, PropertySet<?> propertySet) {
  if (propertyItemConverter != null && propertyItemConverter.getToItemConverter() == null) {
    propertyItemConverter.setToItemConverter(value -> {
      return (value == null) ? Optional.empty()
          : datastore.query(target).filter(QueryFilter.eq(selectionProperty, value)).findOne(propertySet);
    });
  }
}

代码示例来源：origin: com.holon-platform.jpa/documentation-datastore-jpa

void operations() {
  Datastore datastore = getJpaDatastore();
  PropertyBox value = PropertyBox.builder(Test.PROPERTIES).set(Test.PROPERTIES.property("id"), 1L)
      .set(Test.PROPERTIES.property("value"), "test").build(); // <3>
  datastore.save(Test.TARGET, value);
  List<PropertyBox> values = datastore.query(Test.TARGET).filter(Test.PROPERTIES.property("id").gt(0L))
      .sort(Test.PROPERTIES.property("value").desc()).list(Test.PROPERTIES); // <4>
}
// end::beans1[]

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin-flow

@Override
protected Stream<T> fetchFromBackEnd(Query<T, F> query) {
  return _query(query, true).stream(propertySet).map(item -> itemConverter.apply(item));
}

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin

@Override
public long size(QueryConfigurationProvider configuration) throws DataAccessException {
  return buildQuery(configuration, false).count();
}

代码示例来源：origin: com.holon-platform.core/documentation-core

public void beanProjection() {
  final DataTarget<?> TARGET = DataTarget.named("testTarget");
  Datastore datastore = getDatastore(); // build or obtain a concrete Datastore implementation
  Stream<MyBean> results = datastore.query(TARGET).stream(BeanProjection.of(MyBean.class)); // <1>
  Optional<MyBean> result = datastore.query(TARGET).findOne(BeanProjection.of(MyBean.class)); // <2>
  final BeanPropertySet<MyBean> PROPERTIES = BeanPropertySet.create(MyBean.class);
  results = datastore.query(TARGET).stream(BeanProjection.of(MyBean.class, PROPERTIES.property("code"))); // <3>
}
// end::beanprojection[]

代码示例来源：origin: com.holon-platform.core/documentation-core

@SuppressWarnings({ "rawtypes", "unchecked" })
public void joins() {
  // tag::joins[]
  final DataTarget TARGET1 = DataTarget.named("testTarget1");
  final PathProperty<Integer> PROPERTY1 = TARGET1.property("test", Integer.class);
  final DataTarget TARGET2 = DataTarget.named("testTarget2");
  final PathProperty<Integer> PROPERTY2 = TARGET2.property("test", Integer.class);
  RelationalTarget<String> RT = RelationalTarget.of(TARGET1) // <1>
      .join(TARGET2, JoinType.INNER).on(PROPERTY2.eq(PROPERTY1)).add(); // <2>
  RT = RelationalTarget.of(TARGET1).innerJoin(TARGET2).on(PROPERTY2.eq(PROPERTY1)).add(); // <3>
  RT = RelationalTarget.of(TARGET1).leftJoin(TARGET2).on(PROPERTY2.eq(PROPERTY1)).add(); // <4>
  RT = RelationalTarget.of(TARGET1).rightJoin(TARGET2).on(PROPERTY2.eq(PROPERTY1)).add(); // <5>
  Stream<Integer> results = getDatastore().query().target(RT).stream(PROPERTY1); // <6>
  // end::joins[]
}

代码示例来源：origin: com.holon-platform.core/holon-core

@Override
public BeanQuery<T> filter(QueryFilter filter) {
  getExecutor().filter(filter);
  return this;
}

代码示例来源：origin: com.holon-platform.jpa/documentation-datastore-jpa

void query() {
  Datastore datastore = getJpaDatastore();
  List<Test> resultEntities = datastore.query(JPA_TARGET).filter(ID.gt(0L)).list(JPA_TARGET); // <2>
}
// end::model4[]

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin

@Override
public Stream<T> load(QueryConfigurationProvider configuration, int offset, int limit) throws DataAccessException {
  // build a configure a query
  final Query query = buildQuery(configuration, true);
  // limit and offset
  if (limit > 0) {
    query.limit(limit);
    query.offset(offset);
  }
  // execute
  return executeQuery(query);
}

代码示例来源：origin: com.holon-platform.core/holon-core

public DefaultBeanQuery(Class<T> beanClass, Query executor) {
  super(executor);
  this.beanClass = beanClass;
  executor.target(getDataTarget(beanClass));
}

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