what is meant by Transaction Isolation Levels?
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Answer / shraddha
Connection.setTransactionIsolation (level)
TRANSACTION_READ_UNCOMMITTED Allows dirty reads, non-
repeatable reads, and phantom reads to occur.
TRANSACTION_READ_COMMITTED Ensures only committed data
can be read.
TRANSACTION_REPEATABLE_READ Is close to
being "serializable," however, "phantom" reads are possible.
TRANSACTION_SERIALIZABLE Dirty reads, non-repeatable
reads, and phantom reads are prevented. Serializable.
A "phantom" read occurs when one transaction reads all rows
that satisfy a WHERE condition, and a second transaction
inserts a row that satisfies that WHERE condition, the
first transaction then rereads for the same condition,
retrieving the additional "phantom" row in the second read.
In addition, JDBC defines an additional constant,
TRANSACTION_NONE, which is used to indicate that the driver
does not support transactions.
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Answer / arghya
To avoid potential conflicts that can arise when two transaction are operating on a database at the same time, we use some transaction isolation level using conn.setTransactionIsolation().
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we cant Override Jsp Service method?Why?
4 Answers Infrasoft, Mind Tree,
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Hello, My project requirement is like I need to create a web page using MVC pattern. I hava a bean class, jsp page, servlet, service and dao. My jsp has two fields. One is dropdown list. The option values has to get populated from the database table. The other one is a text box and its value has to come from database table. As of now I have defined the fields in bean class, got the values from database using arraylists in dao class and I called this from service class. Can anyone please tell me the workflow of how the servlet will get this arraylist and populate the arraylist values as dropdown options in jsp page? Also I would like to know the role of bean class in MVC pattern? Thanks in advance!
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