The manual setting enables XDS events to resolve to a transaction consisting of one or more SQL statement. By default, embedded SQL events are set to auto transaction type because some SQL statements, such as DDL statements, cannot usually be included in a manual transaction. It treats a single SQL statement or a group of SQL statements as one logical unit, and if any statement fails, the whole transaction fails. To enable manual- transaction support instead of the auto-commit mode that the JDBC driver uses by default, use the Connection object's setAutoCommit() method. If you pass a boolean false to setAutoCommit(), you turn off auto-commit. · Transactions also provide protection against conflicts that might arise when multiple users access the same data at the same time, by using locking mechanisms to block access by others to the data that is being accessed by the current transaction. 2. Typical Transactions Handling Workflow in JDBC Now, let’s see how to use transactions with JDBC.
JDBC allows you to find out what transaction isolation level your DBMS is set to (using the Connection method getTransactionIsolation) and also allows you to set it to another level (using the Connection method setTransactionIsolation). JDBC - Transactions Key Points A transaction is a set of SQL operations that need to be either executed all successfully or not at all. Transaction-related methods are supported in the Connection interface. Basic Steps in JDBC. Importing Packages. Opening a Connection to a Database. Creating a Statement Object. Running a Query and Retrieving a Result Set Object. Processing the Result Set Object. Closing the Result Set and Statement Objects. Making Changes to the Database. Committing Changes.
Automatic Commits vs. Manual Commits. In using SQLJ or JDBC, you can either have your changes automatically committed to the database or commit them manually. The Teiid JDBC API supports three types of transactions from a client perspective – global, local, and request level. >Manual Usage of XA transactions. You might be wondering how we can add transactions into our code if we do not deal directly with the JDBC classes. Spring provides a transaction management.
0コメント