I have problem when create table with UUID type field using CassandraAdminOperations.createTable. I defined field in table with type uuid, but when the table was created using CassandraAdminOperations.createTable, the field was created as timeuuid. Is there any way to force the field to uuid instead of timeuuid ?
Here is the field definition in class,
#PrimaryKeyColumn(name = "id", ordinal = 0, type = PrimaryKeyType.PARTITIONED)
private UUID id;
#Column(value = "url")
private String url;
But when call CassandraAdminOperations.createTable to create the table, the log shows the following and the id filed was created as timeuuid,
00:43:23.877 [localhost-startStop-1] DEBUG o.s.d.c.core.CassandraAdminTemplate - CREATE TABLE IF NOT EXISTS id_to_url_map (id timeuuid, url text, PRIMARY KEY (id));
Thanks!
I had the same problem. But after some investigation, I found that you can add #CassandraType annotation, and explicitly specify the class.
import com.datastax.driver.core.DataType;
#PrimaryKeyColumn(name = "id", ordinal = 0, type = PrimaryKeyType.PARTITIONED)
#CassandraType(type = DataType.Name.UUID)
private UUID id;
Related
Im currently working on creating correct database columns for my database. I have created two tables and used alter:
CREATE TABLE stores (
id SERIAL PRIMARY KEY,
store_name TEXT
-- add more fields if needed
);
CREATE TABLE products (
id SERIAL,
store_id INTEGER NOT NULL,
title TEXT,
image TEXT,
url TEXT UNIQUE,
added_date timestamp without time zone NOT NULL DEFAULT NOW(),
PRIMARY KEY(id, store_id)
);
ALTER TABLE products
ADD CONSTRAINT "FK_products_stores" FOREIGN KEY ("store_id")
REFERENCES stores (id) MATCH SIMPLE
ON UPDATE NO ACTION
ON DELETE RESTRICT;
Now I am trying to use it together with PeeWee and I have managed to do a small step which is:
class Stores(Model):
id = IntegerField(column_name='id')
store_id = TextField(column_name='store_name')
class Products(Model):
id = IntegerField(column_name='id')
store_id = IntegerField(column_name='store_id')
title = TextField(column_name='title')
url = TextField(column_name='url')
image = TextField(column_name='image')
However my problem is that I have used:
ALTER TABLE products
ADD CONSTRAINT "FK_products_stores" FOREIGN KEY ("store_id")
REFERENCES stores (id) MATCH SIMPLE
ON UPDATE NO ACTION
ON DELETE RESTRICT;
which means that I do have a Foreign key and I am quite not sure how I can apply to use Foreign key together with PeeWee. I wonder how can I do that?
You need to add a ForeignKeyField to Products and remove store_id
class Products(Model):
id = IntegerField(column_name='id')
title = TextField(column_name='title')
url = TextField(column_name='url')
image = TextField(column_name='image')
store = ForeignKeyField(Stores, backref='products')
Is there there any way to query on a SET type(or MAP/LIST) to find does it contain a value or not?
Something like this:
CREATE TABLE test.table_name(
id text,
ckk SET<INT>,
PRIMARY KEY((id))
);
Select * FROM table_name WHERE id = 1 AND ckk CONTAINS 4;
Is there any way to reach this query with YCQL api?
And can we use a SET type in SECONDRY INDEX?
Is there any way to reach this query with YCQL api?
YCQL does not support the CONTAINS keyword yet (feel free to open an issue for this on the YugabyteDB GitHub).
One workaround can be to use MAP<INT, BOOLEAN> instead of SET<INT> and the [] operator.
For instance:
CREATE TABLE test.table_name(
id text,
ckk MAP<int, boolean>,
PRIMARY KEY((id))
);
SELECT * FROM table_name WHERE id = 'foo' AND ckk[4] = true;
And can we use a SET type in SECONDRY INDEX?
Generally, collection types cannot be part of the primary key, or an index key.
However, "frozen" collections (i.e. collections serialized into a single value internally) can actually be part of either primary key or index key.
For instance:
CREATE TABLE table2(
id TEXT,
ckk FROZEN<SET<INT>>,
PRIMARY KEY((id))
) WITH transactions = {'enabled' : true};
CREATE INDEX table2_idx on table2(ckk);
Another option is to use with compound primary key and defining ckk as clustering key:
cqlsh> CREATE TABLE ybdemo.tt(id TEXT, ckk INT, PRIMARY KEY ((id), ckk)) WITH CLUSTERING ORDER BY (ckk DESC);
cqlsh> SELECT * FROM ybdemo.tt WHERE id='foo' AND ckk=4;
I have a case class which represents partition key values.
case class UserKeys (bucket:Int,
email: String)
I create query Clauses as follows:
def conditions(id: UserKeys):List[Clauses] = List(
QueryBuilder.eq("bucket", id.bucket), //TODOM - pick table description from config/env file.
QueryBuilder.eq("email", id.email)
)
And use the query as follows
val selectStmt =
select()
.from(tablename)
.where(QueryBuilder.eq(partitionKeyColumns(0), whereClauseList(0))).and(QueryBuilder.eq(partitionKeyColumns(1), whereClauseList(1)))
.limit(1)
I am getting following error.
com.datastax.driver.core.exceptions.InvalidTypeException: Value 0 of type class com.datastax.driver.core.querybuilder.Clause$SimpleClause does not correspond to any CQL3 type
Question 1 - What am I doing wrong?
The query works on cqlsh
The table I am querying is
CREATE TABLE users (
bucket int,
email text,
firstname text,
lastname text,
authprovider text,
password text,
PRIMARY KEY ((bucket, email), firstname, lastname)
Question 2 - Is there a way to print the List which contains the query clauses? I tried it but I get this incomprehensible text.
List(com.datastax.driver.core.querybuilder.Clause$SimpleClause#2389b3ee, com.datastax.driver.core.querybuilder.Clause$SimpleClause#927f81)
My bad, I was using the query clauses incorrectly. Rather than
.where(QueryBuilder.eq(partitionKeyColumns(0), whereClauseList(0))).and(QueryBuilder.eq(partitionKeyColumns(1), whereClauseList(1)))
I needed to do
.where(whereClauseList(0)).and(whereClauseList(1))
because the List already has QueryBuilder.eq("bucket", id.bucket) part
I am trying to insert new column in Cassandra table.
Column Name- feedback_map
Column type- map of text, feedback_map
And trying to execute this statement.
ALTER TABLE my_table ADD feedback_map map<text, frozen<feedback_details>>;
but getting unknown type error on feedback_details
Am pretty new to cassandra.
I am having custom feedback_details user type with two field-
#Field(name = "field_mappings")
private Map<String, String> fieldMappings;
#Field(name = "field_defaults")
private Map<String, String> fieldDefaults;
No i have not defined it yet? do i need to add this user type to my table first??
First, make sure that your User Defined Type (UDT) exists. If not, you'll need to create it:
CREATE TYPE feedback_details (
field_mappings MAP<TEXT, TEXT>,
field_defaults MAP<TEXT, TEXT>);
Then you'll be able to add it as a column on your table (as you have above):
ALTER TABLE my_table ADD feedback_map map<text, frozen<feedback_details>>;
I would like to run the following code with a compound primary key.
Column<String> result = keyspace.prepareQuery(CF_COUNTER1)
.getKey(rowKey)
.getColumn("Column1")
.execute().getResult();
Long counterValue = result.getLongValue();
Research seems to show that it can be a string that represents a key (if it's not a compound primary key). The documentation says that it is of type K, alas, I am not very experience with Java, and have no idea what that means. Is it just a base type that lots of stuff inherits from? If so, I'm not really any closer to knowing what getKey(K) needs in order to handle a compound key (am I?).
You just need to write a class that fits the columns in your data model. You can then give this class to Astyanax in your mutations or queries.
For example, if you had a data model like this
CREATE TABLE fishblogs (
userid varchar,
when timestamp,
fishtype varchar,
blog varchar,
image blob,
PRIMARY KEY (userid, when, fishtype)
);
you would create a class like this:
public class FishBlog {
#Component(ordinal = 0)
public long when;
#Component(ordinal = 1)
public String fishtype;
#Component(ordinal = 2)
public String field;
public FishBlog() {
}
}
When and fishtype form your composite column key and are represented by the FishBlog class. Userid would be your row/partition key and can be of the simple "string" type.
Have a look at this blog explaining in great detail how to insert data with composite keys (where I took this example from).
Hope that helps.