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License: MIT License
Simple usage of Cassandra driver on Java for CRUD operation
License: MIT License
The current implementation checks whether a specific user exists by acquiring a list of all registers users with a specific username, checking if it is empty, and then inserting the new user.
SELECT * FROM " + TABLE_USERS + " WHERE username = '" + username + "';"
....
"INSERT INTO " + TABLE_USERS + " (username, password) " +
"VALUES ('" + username + "', '" + password + "')"
However, this is incorrect, because the same user may be created between the SELECT
and the INSERT
. A correct implementation should use IF NOT EXISTS
.
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