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In this post, I am sharing small demonstration to create CQL User Defined Data Type in Cassandra.
Using user defined data types, you can handle multiple fields into one user-defined column.
For example, You can create user-defined data type for Address related columns, in which you can specify a Street name, City name, Pincode, etc.
Create Keyspace if not exists:
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CREATE KEYSPACE IF NOT EXISTS dbrnd WITH replication = {'class': 'SimpleStrategy', 'replication_factor' : 3}; |
Use a Keyspace:
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USE dbrnd; |
Create user defined data type:
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CREATE TYPE dbrnd.EmployeeAddress ( StreetName TEXT ,CityName TEXT ,ZipCode INT ); |
Create sample table:
frozen
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CREATE TABLE dbrnd.tbl_EmployeeInfo ( EmpID INT PRIMARY KEY ,EmpName VARCHAR ,EmpAddress frozen ); |
Insert sample records:
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INSERT INTO dbrnd.tbl_EmployeeInfo (EmpID,EmpName,EmpAddress) VALUES (1,'Anvesh',{StreetName:'Kondapuar', CityName:'Hyderabad', ZipCode:580084}); INSERT INTO dbrnd.tbl_EmployeeInfo (EmpID,EmpName,EmpAddress) VALUES (2,'Neevan',{StreetName:'Hilldrive', CityName:'Bhavnagar', ZipCode:364002}); |
Select properties of User defined data type column:
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cassandra@cqlsh:dbrnd> SELECT EmpAddress.StreetName FROM dbrnd.tbl_EmployeeInfo; @ Row 1 -----------------------+----------- empaddress.streetname | Kondapuar @ Row 2 -----------------------+----------- empaddress.streetname | Hilldrive (2 rows) |
