Orientdb 简明教程

OrientDB - Rollback Database

在本章中，你将学会如何通过 OrientDB 命令行界面，回滚尚未提交的事务。

In this chapter, you will learn how to roll back the un-committed transaction through the OrientDB command line interface.

以下命令为回滚数据库命令的基本语法。

The following statement is the basic syntax of the Rollback database command.

ROLLBACK

Note −您必须在连接到特定的数据库并且开始事务之后才能使用此命令。

Note − You can use this command only after connecting to a particular database and after beginning the transaction.

Example

在这个例子中，我们会使用上一章建立的，叫做“demo”的相同数据库。我们将会看到回滚事务的操作，以及通过事务储存记录。

In this example, we will use the same database named ‘demo’ that we created in the previous chapter. We will see the operation of rollback transaction and store a record using transactions.

首先，使用以下 BEGIN 命令开始事务。

First, start the transaction using the following BEGIN command.

orientdb {db = demo}> BEGIN

然后，使用以下命令，插入一条 id = 12 且 name = satish.P 的记录到 employee 表中。

Then, insert a record into an employee table with the values id = 12 and name = satish.P using the following command.

orientdb> INSERT INTO employee (id, name) VALUES (12, 'satish.P')

你可以使用以下命令，从 Employee 表中检索记录。

You can use the following command to retrieve the records from the Employee table.

orientdb> SELECT FROM employee WHERE name LIKE '%.P'

如果成功执行此命令，您将得到以下输出。

If this command is executed successfully, you will get the following output.

---+-------+--------------------
 # | ID   | name
---+-------+--------------------
 0 | 12   | satish.P
---+-------+--------------------
1 item(s) found. Query executed in 0.076 sec(s).

你现在可以使用以下命令，来回滚这个事务。

You can now use the following command to Rollback this transaction.

orientdb> ROLLBACK

再次检查 select 查询，来从 employee 表中检索相同的记录。

Check the select query again to retrieve the same record from the employee table.

orientdb> SELECT FROM employee WHERE name LIKE '%.P'

如果回滚成功执行，你会在输出中看到 0 条已找到的记录。

If the rollback is executed successfully, you will get 0 records found in the output.

0 item(s) found. Query executed in 0.037 sec(s).