Examples with Datastore com.google.cloud.datastore.Datastore used on opensource projects

Example 1 with Datastore

use of com.google.cloud.datastore.Datastore in project google-cloud-java by GoogleCloudPlatform.

the class TransactionSnippets method multiplePutEntitiesDeferredId.

/**
   * Example of putting multiple entities with deferred id allocation.
   */
// [TARGET putWithDeferredIdAllocation(FullEntity...)]
public List<Key> multiplePutEntitiesDeferredId() {
    Datastore datastore = transaction.getDatastore();
    // [START multiplePutEntitiesDeferredId]
    IncompleteKey key1 = datastore.newKeyFactory().setKind("MyKind").newKey();
    FullEntity.Builder entityBuilder1 = FullEntity.newBuilder(key1);
    entityBuilder1.set("propertyName", "value1");
    FullEntity entity1 = entityBuilder1.build();
    IncompleteKey key2 = datastore.newKeyFactory().setKind("MyKind").newKey();
    FullEntity.Builder entityBuilder2 = FullEntity.newBuilder(key2);
    entityBuilder2.set("propertyName", "value2");
    FullEntity entity2 = entityBuilder2.build();
    transaction.putWithDeferredIdAllocation(entity1, entity2);
    Response response = transaction.commit();
    // [END multiplePutEntitiesDeferredId]
    return response.getGeneratedKeys();
}

Example 2 with Datastore

use of com.google.cloud.datastore.Datastore in project google-cloud-java by GoogleCloudPlatform.

the class TransactionSnippets method isActive.

/**
   * Example of verifying if a transaction is active.
   */
// [TARGET isActive()]
public Key isActive() {
    Datastore datastore = transaction.getDatastore();
    // [START isActive]
    // create an entity
    KeyFactory keyFactory = datastore.newKeyFactory().setKind("MyKind");
    Key key = datastore.allocateId(keyFactory.newKey());
    Entity entity = Entity.newBuilder(key).set("description", "active()").build();
    // calling transaction.active() now would return true
    try {
        // add the entity and commit
        transaction.put(entity);
        transaction.commit();
    } finally {
        // then transaction.active() will be false
        if (transaction.isActive()) {
            // otherwise it's true and we need to rollback
            transaction.rollback();
        }
    }
    // [END isActive]
    return key;
}

Example 3 with Datastore

use of com.google.cloud.datastore.Datastore in project google-cloud-java by GoogleCloudPlatform.

the class TransactionSnippets method run.

/**
   * Example of running a query to find all entities with an ancestor.
   */
// [TARGET run(Query)]
// [VARIABLE "my_parent_key_name"]
public List<Entity> run(String parentKeyName) {
    Datastore datastore = transaction.getDatastore();
    // [START run]
    KeyFactory keyFactory = datastore.newKeyFactory().setKind("ParentKind");
    Key parentKey = keyFactory.newKey(parentKeyName);
    // Build a query
    Query<Entity> query = Query.newEntityQueryBuilder().setKind("MyKind").setFilter(PropertyFilter.hasAncestor(parentKey)).build();
    QueryResults<Entity> results = transaction.run(query);
    List<Entity> entities = Lists.newArrayList();
    while (results.hasNext()) {
        Entity result = results.next();
        // do something with result
        entities.add(result);
    }
    transaction.commit();
    // [END run]
    return entities;
}

Example 4 with Datastore

use of com.google.cloud.datastore.Datastore in project google-cloud-java by GoogleCloudPlatform.

the class TransactionSnippets method addSingleEntity.

/**
   * Example of adding a single entity.
   */
// [TARGET add(FullEntity)]
// [VARIABLE "my_key_name"]
public void addSingleEntity(String keyName) {
    Datastore datastore = transaction.getDatastore();
    // [START addSingleEntity]
    Key key = datastore.newKeyFactory().setKind("MyKind").newKey(keyName);
    Entity.Builder entityBuilder = Entity.newBuilder(key);
    entityBuilder.set("propertyName", "value");
    Entity entity = entityBuilder.build();
    transaction.add(entity);
    transaction.commit();
// [END addSingleEntity]
}

Example 5 with Datastore

use of com.google.cloud.datastore.Datastore in project google-cloud-java by GoogleCloudPlatform.

the class TransactionSnippets method active.

/**
   * Example of verifying if a transaction is active.
   */
// [TARGET active()]
public Key active() {
    Datastore datastore = transaction.getDatastore();
    // [START active]
    // create an entity
    KeyFactory keyFactory = datastore.newKeyFactory().setKind("MyKind");
    Key key = datastore.allocateId(keyFactory.newKey());
    Entity entity = Entity.newBuilder(key).set("description", "active()").build();
    // calling transaction.active() now would return true
    try {
        // add the entity and commit
        transaction.put(entity);
        transaction.commit();
    } finally {
        // then transaction.isActive() will be false
        if (transaction.isActive()) {
            // otherwise it's true and we need to rollback
            transaction.rollback();
        }
    }
    // [END active]
    return key;
}