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In this post, I am sharing a demonstration of Cassandra Collection data types.
Basically, CQL provides three different types of collection data types, SET, LIST, MAP.
Using collection data types, you can store multiple values in a single column.
You can store multiple values in a single column, but try to keep your collection small otherwise it creates performance overhead.
Collection data types:
Create a sample table with collectio data type
(SET, LIST, MAP):
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CREATE TABLE IF NOT EXISTS tbl_Employee ( EmpID INT PRIMARY KEY ,EmpName VARCHAR ,Emails SET ,Hobbies LIST ,Address MAP ) ; |
Insert a sample record:
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INSERT INTO tbl_Employee (EmpID,EmpName,Emails,Hobbies,Address) VALUES ( 1 ,'Anvesh' ,{'test1@gmail.com','test2@gmail.com'} ,['Blogging','Animation','Photography'] ,{'home': 'Gujarat', 'office': 'Hyderabad'} ); |
Update data on Collection type:
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UPDATE tbl_Employee SET Emails = Emails + {'test3@gmail.com'} WHERE EmpID=1; UPDATE tbl_Employee SET Hobbies = Hobbies + ['Watching Movies'] WHERE EmpID=1; UPDATE tbl_Employee SET Address = Address + {'farm':'Bhavnagar'} WHERE EmpID=1; |
Filter on Collection type:
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SELECT * FROM tbl_Employee WHERE Address CONTAINS 'Gujarat' ALLOW FILTERING; SELECT * FROM tbl_Employee WHERE Hobbies CONTAINS 'Blogging' ALLOW FILTERING; SELECT * FROM tbl_Employee WHERE Emails CONTAINS 'test1@gmail.com' ALLOW FILTERING; |
