Analysis of transaction isolation level in Java Affairs API framework

Analysis of transaction isolation level in Java Affairs API framework Affairs is a common concept in the database. It ensures that a series of operations on the database either successfully submit or roll back.In order to meet different needs and scenarios, the database provides different transaction isolation levels.The Java transaction API framework also provides support for transaction isolation levels. Affairs isolation level defines the visibility and interaction of one transaction on other affairs.In the Java transaction API framework, there are four transaction isolation levels available, namely: 1. Read UncommittedThis isolation level is very low, which will cause problems such as dirty reading, unspeakable reading, and fantasy reading. 2. Read committedThis is the default isolation level of most databases, which can avoid the problem of dirty reading, but there may still be problems such as repeated reading and phantom reading. 3. Repeatable Read: This level represents the same results when a transaction reads the same data multiple times during execution.In this isolation level, other matters cannot modify the data of the transaction that are being executed, and it can avoid dirty reading and unsurprising problems, but there may still be an illusion problem. 4. Serializable: This level is the highest isolation level. It ensures that each transaction does not see the modification of the database at all during the execution process.This level can avoid problems of dirty reading, non -repeated reading, and phantom reading, but it will have a great impact on the concurrent performance of the system. The following is an example code using the Java transaction API framework: import javax.transaction.Transactional; @Transactional(isolation = Isolation.READ_COMMITTED) public void doTransaction() { // Execute transaction operation } In the above code example, the annotation of `@transactional` is used to define the attributes of transactions, where the` isolation` attributes can specify transaction isolation levels.In the above example, the isolation level of transaction is set to `Read_committed`. Summarize: The transaction isolation level plays an important role in the Java transaction API framework. It can ensure that the affairs of concurrent execution will not affect each other, thereby providing data consistency and integrity guarantee.Developers can choose the appropriate transaction isolation level according to specific needs to realize the security operation of data.