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New in version 0.9.5: Support has been added to allow a single-column comparison to itself within a primaryjoin condition, as well as for primaryjoin conditions that use as the comparison operator.

Self-Referential Many-to-Many Relationship¶

Many to many relationships can be customized by one or both of and - the latter is significant for a relationship that specifies a many-to-many reference using the argument. A common situation which involves the usage of and is when establishing a many-to-many relationship from a class to itself, as shown below:

fromsqlalchemyimportInteger,ForeignKey,String,Column,Tablefromsqlalchemy.ext.declarativeimportdeclarative_basefromsqlalchemy.ormimportrelationshipBase=declarative_base()node_to_node=Table("node_to_node",Base.metadata,Column("left_node_id",Integer,ForeignKey("node.id"),primary_key=True),Column("right_node_id",Integer,ForeignKey("node.id"),primary_key=True))classNode(Base):__tablename__='node'id=Column(Integer,primary_key=True)label=Column(String)right_nodes=relationship("Node",secondary=node_to_node,primaryjoin=id==node_to_node.c.left_node_id,secondaryjoin=id==node_to_node.c.right_node_id,backref="left_nodes")

Where above, SQLAlchemy can’t know automatically which columns should connect to which for the and relationships. The and arguments establish how we’d like to join to the association table. In the Declarative form above, as we are declaring these conditions within the Python block that corresponds to the class, the variable is available directly as the object we wish to join with.

Alternatively, we can define the and arguments using strings, which is suitable in the case that our configuration does not have either the column object available yet or the table perhaps isn’t yet available. When referring to a plain object in a declarative string, we use the string name of the table as it is present in the :

classNode(Base):__tablename__='node'id=Column(Integer,primary_key=True)label=Column(String)right_nodes=relationship("Node",secondary="node_to_node",primaryjoin="Node.id==node_to_node.c.left_node_id",secondaryjoin="Node.id==node_to_node.c.right_node_id",backref="left_nodes")

A classical mapping situation here is similar, where can be joined to :

fromsqlalchemyimportInteger,ForeignKey,String,Column,Table,MetaDatafromsqlalchemy.ormimportrelationship,registrymetadata_obj=MetaData()mapper_registry=registry()node_to_node=Table("node_to_node",metadata_obj,Column("left_node_id",Integer,ForeignKey("node.id"),primary_key=True),Column("right_node_id",Integer,ForeignKey("node.id"),primary_key=True))node=Table("node",metadata_obj,Column('id',Integer,primary_key=True),Column('label',String))classNode(object):passmapper_registry.map_imperatively(Node,node,properties={'right_nodes':relationship(Node,secondary=node_to_node,primaryjoin=node.c.id==node_to_node.c.left_node_id,secondaryjoin=node.c.id==node_to_node.c.right_node_id,backref="left_nodes")})

Note that in both examples, the keyword specifies a backref - when creates the second relationship in the reverse direction, it’s smart enough to reverse the and arguments.

Composite “Secondary” Joins¶

Note

This section features far edge cases that are somewhat supported by SQLAlchemy, however it is recommended to solve problems like these in simpler ways whenever possible, by using reasonable relational layouts and / or in-Python attributes.

Sometimes, when one seeks to build a between two tables there is a need for more than just two or three tables to be involved in order to join them. This is an area of where one seeks to push the boundaries of what’s possible, and often the ultimate solution to many of these exotic use cases needs to be hammered out on the SQLAlchemy mailing list.

In more recent versions of SQLAlchemy, the parameter can be used in some of these cases in order to provide a composite target consisting of multiple tables. Below is an example of such a join condition (requires version 0.9.2 at least to function as is):

classA(Base):__tablename__='a'id=Column(Integer,primary_key=True)b_id=Column(ForeignKey('b.id'))d=relationship("D",secondary="join(B, D, B.d_id == D.id).""join(C, C.d_id == D.id)",primaryjoin="and_(A.b_id == B.id, A.id == C.a_id)",secondaryjoin="D.id == B.d_id",uselist=False,viewonly=True)classB(Base):__tablename__='b'id=Column(Integer,primary_key=True)d_id=Column(ForeignKey('d.id'))classC(Base):__tablename__='c'id=Column(Integer,primary_key=True)a_id=Column(ForeignKey('a.id'))d_id=Column(ForeignKey('d.id'))classD(Base):__tablename__='d'id=Column(Integer,primary_key=True)

In the above example, we provide all three of , , and , in the declarative style referring to the named tables , , , directly. A query from to looks like:

sess.query(A).join(A.d).all()

SELECTa.idASa_id,a.b_idASa_b_idFROMaJOIN(bASb_1JOINdASd_1ONb_1.d_id=d_1.idJOINcASc_1ONc_1.d_id=d_1.id)ONa.b_id=b_1.idANDa.id=c_1.a_idJOINdONd.id=b_1.d_id

In the above example, we take advantage of being able to stuff multiple tables into a “secondary” container, so that we can join across many tables while still keeping things “simple” for , in that there’s just “one” table on both the “left” and the “right” side; the complexity is kept within the middle.

Warning

A relationship like the above is typically marked as and should be considered as read-only. While there are sometimes ways to make relationships like the above writable, this is generally complicated and error prone.

Relationship to Aliased Class¶

New in version 1.3: The construct can now be specified as the target of a , replacing the previous approach of using non-primary mappers, which had limitations such that they did not inherit sub-relationships of the mapped entity as well as that they required complex configuration against an alternate selectable. The recipes in this section are now updated to use .

In the previous section, we illustrated a technique where we used in order to place additional tables within a join condition. There is one complex join case where even this technique is not sufficient; when we seek to join from to , making use of any number of , , etc. in between, however there are also join conditions between and directly. In this case, the join from to may be difficult to express with just a complex condition, as the intermediary tables may need special handling, and it is also not expressible with a object, since the pattern does not support any references between and directly. When this extremely advanced case arises, we can resort to creating a second mapping as a target for the relationship. This is where we use in order to make a mapping to a class that includes all the additional tables we need for this join. In order to produce this mapper as an “alternative” mapping for our class, we use the function to produce the new construct, then use against the object as though it were a plain mapped class.

Below illustrates a with a simple join from to , however the primaryjoin condition is augmented with two additional entities and , which also must have rows that line up with the rows in both and simultaneously:

classA(Base):__tablename__='a'id=Column(Integer,primary_key=True)b_id=Column(ForeignKey('b.id'))classB(Base):__tablename__='b'id=Column(Integer,primary_key=True)classC(Base):__tablename__='c'id=Column(Integer,primary_key=True)a_id=Column(ForeignKey('a.id'))some_c_value=Column(String)classD(Base):__tablename__='d'id=Column(Integer,primary_key=True)c_id=Column(ForeignKey('c.id'))b_id=Column(ForeignKey('b.id'))some_d_value=Column(String)# 1. set up the join() as a variable, so we can refer# to it in the mapping multiple times.j=join(B,D,D.b_id==B.id).join(C,C.id==D.c_id)# 2. Create an AliasedClass to BB_viacd=aliased(B,j,flat=True)A.b=relationship(B_viacd,primaryjoin=A.b_id==j.c.b_id)

With the above mapping, a simple join looks like:

sess.query(A).join(A.b).all()

SELECTa.idASa_id,a.b_idASa_b_idFROMaJOIN(bJOINdONd.b_id=b.idJOINcONc.id=d.c_id)ONa.b_id=b.id

Using the AliasedClass target in Queries¶

In the previous example, the relationship refers to the entity as the target, and not the class directly. To add additional criteria involving the relationship, it’s typically necessary to reference the directly rather than using , especially in a case where the target entity of is to be transformed into an alias or a subquery. Below illustrates the same relationship using a subquery, rather than a join:

subq=select(B).join(D,D.b_id==B.id).join(C,C.id==D.c_id).subquery()B_viacd_subquery=aliased(B,subq)A.b=relationship(B_viacd_subquery,primaryjoin=A.b_id==subq.c.id)

A query using the above relationship will render a subquery:

sess.query(A).join(A.b).all()

SELECTa.idASa_id,a.b_idASa_b_idFROMaJOIN(SELECTb.idASid,b.some_b_columnASsome_b_columnFROMbJOINdONd.b_id=b.idJOINcONc.id=d.c_id)ASanon_1ONa.b_id=anon_1.id

If we want to add additional criteria based on the join, we must do so in terms of rather than directly:

(sess.query(A).join(A.b).filter(B_viacd_subquery.some_b_column=="some b").order_by(B_viacd_subquery.id)).all()

SELECTa.idASa_id,a.b_idASa_b_idFROMaJOIN(SELECTb.idASid,b.some_b_columnASsome_b_columnFROMbJOINdONd.b_id=b.idJOINcONc.id=d.c_id)ASanon_1ONa.b_id=anon_1.idWHEREanon_1.some_b_column=?ORDERBYanon_1.id

Row-Limited Relationships with Window Functions¶

Another interesting use case for relationships to objects are situations where the relationship needs to join to a specialized SELECT of any form. One scenario is when the use of a window function is desired, such as to limit how many rows should be returned for a relationship. The example below illustrates a non-primary mapper relationship that will load the first ten items for each collection:

classA(Base):__tablename__='a'id=Column(Integer,primary_key=True)classB(Base):__tablename__='b'id=Column(Integer,primary_key=True)a_id=Column(ForeignKey("a.id"))partition=select(B,func.row_number().over(order_by=B.id,partition_by=B.a_id).label('index')).alias()partitioned_b=aliased(B,partition)A.partitioned_bs=relationship(partitioned_b,primaryjoin=and_(partitioned_b.a_id==A.id,partition.c.index<10))

We can use the above relationship with most of the loader strategies, such as :

fora1ins.query(A).options(selectinload(A.partitioned_bs)):print(a1.partitioned_bs)# <-- will be no more than ten objects

Where above, the “selectinload” query looks like:

SELECTa_1.idASa_1_id,anon_1.idASanon_1_id,anon_1.a_idASanon_1_a_id,anon_1.dataASanon_1_data,anon_1.indexASanon_1_indexFROMaASa_1JOIN(SELECTb.idASid,b.a_idASa_id,b.dataASdata,row_number()OVER(PARTITIONBYb.a_idORDERBYb.id)ASindexFROMb)ASanon_1ONanon_1.a_id=a_1.idANDanon_1.index<%(index_1)sWHEREa_1.idIN(...primarykeycollection...)ORDERBYa_1.id

Above, for each matching primary key in “a”, we will get the first ten “bs” as ordered by “b.id”. By partitioning on “a_id” we ensure that each “row number” is local to the parent “a_id”.

Such a mapping would ordinarily also include a “plain” relationship from “A” to “B”, for persistence operations as well as when the full set of “B” objects per “A” is desired.

Building Query-Enabled Properties¶

Very ambitious custom join conditions may fail to be directly persistable, and in some cases may not even load correctly. To remove the persistence part of the equation, use the flag on the , which establishes it as a read-only attribute (data written to the collection will be ignored on flush()). However, in extreme cases, consider using a regular Python property in conjunction with as follows:

classUser(Base):__tablename__='user'id=Column(Integer,primary_key=True)@propertydefaddresses(self):returnobject_session(self).query(Address).with_parent(self).filter(...).all()

In other cases, the descriptor can be built to make use of existing in-Python data. See the section on Using Descriptors and Hybrids for more general discussion of special Python attributes.

Источник: https://docs.sqlalchemy.org/14/orm/join_conditions.html
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History of the Key West Custom House

Soon after laying the Custom House’s foundation, a drunken arrangement nearly derailed the building’s construction.  During one alcohol-fueled evening on the island, John McDermott, a partner in the project, promised George Martin, a seedy local bar and dance hall owner, a significant portion of the contract.  Upon hearing the news, Lawrence Higgs, McDermott’s partner, contacted officials in Washington, D.C. claiming that any addenda to the original contract were void due to how intoxicated McDermott and Martin were during their night out together.

Higgs believed that he could complete the construction on his own; however, officials in Washington, D.C. opted to replace McDermott & Higgs as the Custom House contractors with a local cigar manufacturer, Augustine del Pino.  S.S. Harvey, the local government supervisor, immediately pointed out that del Pino possessed little knowledge of construction techniques and was even more appalled by his appointment of George Martin as his construction foreman.  Despite the disapproval, construction continued.

As construction moved forward so did the problems.  Key West’s chief U.S. District Judge James W. Locke questioned some of the unnecessary building features such as the numerous fireplaces.  Various government supervisors noted that many of the 917,000 bricks shipped from New York were spalled and discolored and that a number of window sills had been damaged in transit.  A noticeable flaw in the design was the lack of toilets inside the building, which posed a serious problem for the jurors of district court cases who had to be escorted down three flights of stairs and outside the building to use latrines.  Fortunately, the building was eventually equipped with the necessary amenities.

Источник: https://www.kwahs.org/museums/custom-house/custom-house-history

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CleanKey™

Antimicrobial Brass Hand Tool

CleanKey
CleanKey

The safe and easy way to avoid germs.

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How can my KeySmart be customized?

Laser Engraved and Full Colour Printing

Logo Branding
Logo Branding

With a choice of colours the KeySmart can be laser engraved branded with your logo, full colour printing is available with the KeySmart Pro.

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Full Canvas Printing

What options do I have for customized packaging?

Custom KeySmart All Wrapped Up

Packaging Wrap

Customized with your branding

Your Logo

Your Logo

Available for ALL KeySmart Products

We go beyond simply printing a logo on a product, we know making the right brand impression is important to you.

Packaging Wrap

Packaging Sleeve

Available for ALL KeySmart Products

We can also package and present your brand with a range of customised options available.

How long will my order take to produce?

Shipping varies from 1-5 days depending on your location.

24 hours no branding.

24 hours no branding.

5-7 days with your branding.

5-7 days with your branding.

7-10 days with Gift Box + Custom Sleeve

7-10 days with Gift Box + Custom Sleeve.

People love KeySmart and are proud to show it off

And because KeySmart keeps keys tidy and is used everyday, the peoples united login associations are huge.

To enquire about using KeySmart to promote your company, please fill out the form below, or email us direct [email protected]

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Thanks for enquiring, please add sales@customkeysmart.com> to your safe senders list so our response can reach you. Please check your junk folder if you haven't heard from us within 12 hrs, if there's nothing there, the safest option is to ring us on +44 (0)1892 500064.

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We can offer an impressive 10 day turnaround on most orders, starting at only 50 units.

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The Tradition of Giving a Key Pendant

Bashert Jewelry. Custom Key Pendant Necklaces. Collection of Signature, Handcrafted Key Pendants. Free Shipping to USA.

Key pendants have custom key to the city been a popular present for all ages and every occasion.

Here are few reasons why

Key pendants are customarily given as a present on the 21st birthday. This tradition dates from the times when at twenty-one, you were considered old enough to be a key-holder to your family’s home, and thus hold a symbolical 'senior' position in the family. It's an old tradition that, some think, has long since become irrelevant and obsolete, but the symbolism of the key on the 21st birthday lives on. Both  21st birthday and Graduations are considered to be a "new beginning" occasion and key pendants are popular presents for both.

Keys have always been endowed with a certain sort of magic. It’s believed they have the power to reveal things that were unknown or obscured before. In Far East cultures, keys are regarded as a "Good Luck" presents and a bearer of a good fortune ahead. It was believed that wearing a Key as custom key to the city Pendant will open physical, intellectual, or spiritual barriers and give access, or attract riches of all nature.

Folktales tell of a universal “Skeleton Key”, that will successfully unlock anything you wish for. Thus such a key pendant is given to open new horizons and new uncharted adventures for one who wears it.

In modern days, we have adopted the Key Pendant as a symbol of entrusting someone with the access to one's "Heart of Hearts". The "Key to a Heart" is given in the same fashion as the “Key to a City” has been given for ages. The practice of presenting a "Key to the City" to an individual can be traced back the Middle Ages when it was a symbol of the City's intention that the recipient custom key to the city free to come and go at will. Today it is considered a symbolic gesture, bestowed upon distinguished persons and honored guests for achievements of the highest importance. Giving someone the "key to Your Heart" will be a symbol of expressing a special trust and commitment. In present days, when in a romantic relationship, two will exchange keys from their homes as an act, that signifies the moment when a relationship has been taken to the next level and the foundation of a life together has been laid. 

The rich symbolism bestowed upon Key pendants is drawn from many cultures and makes them a versatile present for just about any age and any occasion. Key pendants can be equally appropriate presents for both romantic and none romantic occasions, celebrating family milestones or personal achievements.  

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Источник: https://bashertjewelry.com/pages/the-tradition-of-giving-a-key-pendants

Add key to data ingested through Kafka Connect

Run it

1

Initialize the project

To get started, make a new directory anywhere you’d like for this project:

2

Get Confluent Platform

Create a Dockerfile called that builds a custom container for Kafka Connect bundled with the free and open source JDBC connector, installed from Confluent Hub.

Next, create the following file to obtain Confluent Platform (for Kafka in the cloud, see Confluent Cloud):

Now launch Confluent Platform by running the following command. Note the argument which automatically builds the Docker image for Kafka Connect and the bundled kafka-connect-jdbc connector.

3

Configure the project

Create the following Gradle build file, named for the project:

And be sure to run the following command to obtain the Gradle wrapper:

Next, create a directory for configuration data:

Then create a development file at :

4

Create a schema for the events

This tutorial uses one stream of cities. Let’s create the schemas for it.

Create a directory for the schema that represents each city in the stream:

Then create the following Avro schema file at for the cities lookup table:

Because we will use this Avro solano county cps in our Java code, we’ll need to compile it. The Gradle Avro plugin is a part of the build, so it will see your new Avro file, generate Java code for them, and compile those and all other Java sources. Run this command to get it all done:

5

Create the source database

Create a file with commands to prepopulate the database table with city information:

Then create a to build the sqlite container. Notice that it pulls in the file created in the previous step.

Create the source database, running this from the directory with the and the file:

View the data in the source table:

6

Run the connector

Copy the sqlite database from the docker image to the docker image:

Make a configuration file called for the JDBC source connector to pull data from the table. Notice that it uses a single message transformation (SMT) called SetSchemaMetadata to set the schema name to the class name.

Run the JDBC custom key to the city connector:

7

Create the Kafka Streams topology

Create a directory for the Java files in this project:

Then create the following file at. Let’s take a close look at the method, which uses the Kafka Streams DSL.

The first thing the method does is build a stream from the input topic. It uses the to create a called that has no message key and a message value of type .

Next, using the method, it extracts a field in the message value that corresponds to the city ID, and assigns it as the message key. It results in a called that has a message key usps office open today type and a message value of type .

Finally this is written to the output topic using the method.

8

Compile and run the Kafka Streams program

Now that you have an uberjar for the Kafka Streams application, you can launch it locally. When you run the following, the prompt won’t return, because the application will run until you exit it. There is always another message to process, so streaming applications don’t exit until you force them.

9

Consume events from custom key to the city input topic and output topic

Run the Avro console consumer to view the messages in the topic. This is the topic that the JDBC source connector writes to, and note that the keys are :

Next, run the Avro console consumer to view the messages in the topic. This is the output topic that the Kafka Streams application creates from the input topicand note that it has added the keys:

Test it

1

Create a test configuration file

First, create a test file at :

2

Write a test

Then, create a directory for the tests to live in:

Create the following test file at :

3

Invoke the tests

Now run the test, which is as simple as:

Take it to production

1

Create a production configuration file

First, create a new configuration file at with the following content. Be sure to fill in the addresses of your production hosts and change any other parameters that make sense for your setup.

2

Build a Docker image

In your terminal, execute the following to invoke the Jib plugin to build an image:

3

Launch the container

Finally, launch the container using your preferred container orchestration service. If you want to run it locally, you can execute the following:

Deploy on Confluent Cloud

1

Run your app to Confluent Cloud

Instead of running a local Kafka cluster, you may use Confluent Cloud, a fully-managed Apache Kafka service.

  1. Sign up for Confluent Cloud, a fully-managed Apache Kafka service.

  2. After you log in to Confluent Cloud Console, click on and name the environment. Using a new environment keeps your learning resources separate from your other Confluent Cloud resources.

  3. From the section in the Menu, apply the promo code to receive an additional $100 free usage on Confluent Cloud (details).

  4. Click on LEARN and follow the instructions to launch a Kafka cluster and to enable Schema Registry.

Confluent Cloud

Next, from the Confluent Cloud Console, click on to get the cluster-specific configurations, e.g. Kafka cluster bootstrap servers and credentials, Confluent Cloud Schema Registry and credentials, etc., and set the appropriate parameters in your client application. In the case of this tutorial, add the following properties to the client application’s input properties file, substituting all curly braces with your Confluent Cloud values.

Now you’re all set to run your streaming application locally, backed by a Kafka cluster fully managed by Confluent Cloud.

Источник: https://kafka-tutorials.confluent.io/connect-add-key-to-source/kstreams.html

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