Reading data from the Cassandra keyspace
-
Double-click the tCassandraInput
component to open its Component
view.
-
Type in required information for the connection or use the existing
connection you have configured before. In this scenario, the Use existing connection check box is
selected. -
In the Keyspace configuration area, type
in the name of the keyspace: Employee in
this example. -
In the Column family configuration area,
type in the name of the column family: Employee_Info in this example. -
Select Edit schema to define the data
structure to be read from the Cassandra keyspace. In this example, three
columns id, name and age are
defined.
-
If needed, select the Include key in output
columns check box, and then select the key column of the
column family you want to include from the Key
column list. -
From the Row key type list, select
Integer because id is of integer type in this example.Keep the Default option for the row key
Cassandra type because its value will become the corresponding Cassandra
type Int32 automatically. -
In the Query configuration area, select
the Specify row keys check box and specify
the row keys directly. In this example, three rows will be read. Next,
select the Specify columns check box and
specify the column names of the column family directly. This scenario will
read three columns from the keyspace: id,
name and age. -
If needed, the Key start and the
Key end fields allow you to define the
range of rows, and the Key limit field
allows you to specify the number of rows within the range of rows to be
read. Similarly, the Columns range start
and the Columns range end fields allow you
to define the range of columns of the column family, and the Columns range limit field allows you to specify
the number of columns within the range of columns to be read.
Document get from Talend https://help.talend.com
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