I'm trying to run the following example from here
CREATE TYPE address (
street text,
city text,
zip int
);
CREATE TABLE user_profiles (
login text PRIMARY KEY,
first_name text,
last_name text,
email text,
addresses map<text, address>
);
However, when I try to create the user_profiles table, I get the following error:
InvalidRequest: code=2200 [Invalid query] message="Non-frozen collections are not
allowed inside collections: map<text, address>
Any thoughts on why this could be happening?
I am running 2.1.8 and I get the same error message. To fix this, you need the frozen keyword:
CREATE TABLE user_profiles (
login text PRIMARY KEY,
first_name text,
last_name text,
email text,
addresses map<text, frozen <address>>
);
Frozen is necessary for UDTs (for now) as it serializes them into a single value. A similar, better example for you to follow might be the one in the User Defined Type documentation. Give that a try.
I was getting this message when I mistakenly used "string" instead of "text" in a cassandra map, like:
mymap map<bigint, string>
I followed this stackoverflow thread from google and I thought this information could save someone a few minutes of their time.
Non-frozen UDTs are not yet supported. The reason for asking the user to explicitly specify this keyword for each UDT is to be able to introduce mutable UDTs in 3.x without breaking existing code.
Related
I am trying to fetch the Primary Key/Clustering Key names for a particular table/entity and implement the same query in my JPA interface (which extends CassandraRepository).
I am not sure whether something like:
#Query("DESCRIBE TABLE <table_name>)
public Object describeTbl();
would work here as describe isn't a valid CQL statement and in case it would, what would be the type of the Object?
Suggestions?
One thing you could try, would be to query the system_schema.columns table. It is keyed by keyspace_name and table_name, and might be what you're looking for here:
> SELECT column_name,kind FROM system_schema.columns
WHERE keyspace_name='spaceflight_data'
AND table_name='astronauts_by_group';
column_name | kind
-------------------+---------------
flights | regular
group | partition_key
name | clustering
spaceflight_hours | clustering
(4 rows)
DESCRIBE TABLE is supported only in Cassandra 4 that includes fix for CASSANDRA-14825. But it may not help you much because it just returns the text string representing the CREATE TABLE statement, and you'll need to parse text to extract primary key definition - it's doable but could be tricky, depending on the structure of the primary key.
Or you can obtain underlying Session object and via getMetadata function get access to actual metadata object that allows to obtain information about keyspaces & tables, including the information about schema.
I'm a beginner in Cassandra and I have a table like this:
CREATE TABLE Books(
Title text PRIMARY KEY,
Authors set<text>,
Family set <text>,
Publisher text,
Price decimal
);
(the other options are missing because it's only an example)
now I would like to execute this query:
DELETE Price FROM Books WHERE Authors CONTAINS 'J.K. Rowling' IF EXISTS;
But it doesn't work. I searched on Google but found nothing.
Hope somebody can help me and sorry if my english is not very good.
but it doesn't work.
That doesn't really give us enough information to help you. Usually, you'll want to provide an error message. I built your table locally, inserted data, and tried your approach. This is the error that I see:
InvalidRequest: Error from server: code=2200 [Invalid query]
message="Some partition key parts are missing: title"
DELETE requires that the appropriate PRIMARY KEY components be specified in the WHERE clause. In your case, Authors is not part of the PRIMARY KEY definition. Given the error message returned (and the table definition) specifying title is the only way to delete rows from this table.
aploetz#cqlsh:stackoverflow> DELETE FROM Books
WHERE title = 'Harry Potter and the Chamber of Secrets'
IF EXISTS;
[applied]
-----------
True
Can I do a query like this? UPDATE Books SET Family = Family + {'Fantasy'} WHERE Authors CONTAINS 'J.K. Rowling';
No. This fails for the same reason. Writes in Cassandra (INSERTs, UPDATEs, DELETEs are all writes) require the primary key (specifically, the partition key) in the WHERE clause. Without that, Cassandra can't figure out which node holds the data, and it needs that to perform the write.
I can't seem to create a table like this, whose constraints portion is throwing error.
CREATE TABLE admins (
id UUID PRIMARY KEY,
username text,
password text,
name text,
access_level text,
CONSTRAINT access_types CHECK(access_level) in ('true', 'false')
);
SyntaxException: line 7:28 mismatched input 'CHECK' expecting ')' (... access_level text, access_types CONSTRAINT [CHECK]...)
How do I add constraints? I can't seem to find a way to add constraints with cql, which doesn't seem to have documentation for it. If this is not supported, why?
Cassandra doesn't have this kind of constraint. Usually, it's up to your app care about it.
I am new to Cassandra and I am using version 3.11.
I have below UDT type and I am trying to write ALTER Query to change. I am able to write separate command for RENAME, ADD but I want to have all in one query. Could I get help to have in one query.
create type if not exists payment_types (
billing_type int,
payer_id text
);
ALTER TYPE payment_types to have following fields
billing_type text,
billing_id text,
biller_name text,
payer_name text
Also when I was executing i am getting
Error from server: code=2200 [Invalid query] message="Altering of types is not allowed"
You are using cassandra 3.11 version.
Here is details:
https://docs.datastax.com/en/cql/3.3/cql/cql_reference/cqlAlterTable.html
There are some specifications to alter data types:
https://docs.datastax.com/en/cql/3.3/cql/cql_reference/cql_data_types_c.html#cql_data_types_c__cql_data_type_compatibility
Let's go directly to the question: I've this RDBMS schema, that is a part of a large schema that I don't know.
Now, the request (it's a university project) is to think 5 queries and then build this schema in Cassandra and perform those queries via CQL.
Now.. I get that I don't have Join operation in Cassandra, so I kinda need to duplicate something, but I stil can't understand something important.
Let's say my first query is "Print all SalesOrderHeader (its ID and status) with OrderDate > 01/01/2017".. So, for this I will need a ColumnFamily for SalesOrderHeader and so I will write something like:
CREATE TABLE SalesOrderHeader {
alesOrderID uuid PRIMARY KEY,
RevisionNumber TEXT,
OrderDate TIMESTAMP,
DueDate TIMESTAMP,
ShipDate TIMESTAMP,
Status TEXT,
OnlineOrderFlag BOOLEAN,
SalesOrderNumber TEXT,
PurchaseOrderNumber TEXT,
AccountNumber TEXT,
SubTotal FLOAT,
TaxAmt FLOAT,
Freight TEXT,
TotalDue FLOAT,
Comment TEXT,
CreditCartApprovalCode TEXT,
}
But now, what I don't understand is: should I add to this "TABLE" the information about the CreditCard?
I mean, let's say a second query ask me "Print all SalesOrderHader (id and status) made with a CreditCard of Type = VISA". CreditCard and SalesOrderHeader is a 1-To-1 Relation, so I could Think to put all the information about CreditCard into the TABLE SalesOrderHeader, but should I make two different TABLE of SalesOrderHeader, one with the CreditCard information and one without?
Unfortunately in classes we just saw what's Cassandra is, then they said "Ok, to this project and read the Cassandra Documentation".. Too bad I'm having lots of problem >_>
I searched on the internet but I just found some easier example with two table (like Song and Playlist) but they didn't really help me.