autonomous quadcopter

AND inventory_item_id = p_inventory_item_id for update Once data is selected, the session that uses the same SQL statement cannot obtain the data, which ensures that the same lot number cannot be generated. after successfully updating the lot number, you can use commit to release the lock. The problem arises. If we use commit to commit this transaction, all the transactions will be committed. If an error is rolled back later, some data will be committed, another part of data is rolled

, more and more applications no longer control the user interface, for two reasons: first, the user interface is designed elsewhere; second, the user interface accesses the application through the Internet. Obviously, when building and designing applications, we should consider the need for cross-computing platform integration. Fortunately, we have an architecture solution. Service-Oriented Architecture (SOA) regards applications as services that can be discovered and accessed over the Internet,

I went to the Guangxi Zhuang Autonomous Region Museum to see Chen Qingzhu's large-scale oil painting exhibition and Hunan embroidery It happened that Chen Qingzhu's large-scale oil painting exhibition was held at the Guangxi Zhuang Autonomous Region Museum for free. During this time, I was watching Ernst H. the history of art-the story of art, translated by fan yuan, describes a lot of oil painting knowled

[Oracle] uses autonomous transactions to implement the audit function. In a transaction (outer transaction), one or several autonomous transactions can be defined. An autonomous transaction can be committed independently without affecting the outer transaction. Similarly, the rollback of the outer transaction does not affect the

A database transaction is a unit operation, either all operations succeed or all fail. In Oracle, a transaction begins with executing the first Data Governance language (DML) statement until a commit statement is executed, commits to save the transaction, or executes a rollback statement that discards the operation. The nature of the "either complete or incomplete" of the transaction makes it difficult to log the error message into the database table because the INSERT statement used to write t

information security. ”Ni Guangnan, academician of the Chinese Academy of Engineering, who attended the forum, also said that constructing the ecosystem of domestic operating system, integrating the relevant fields of intelligent terminal in our country, and concentrating on the advantage force, became the key to solve the cowgirl of our country in the operating system field.For the current state of the development of domestic operating systems, Ni Guangnan in Beijing's It channel interview con

Tsinghua University Video Courseware: Object-oriented Programming (C + +) (autonomous mode)Course IntroductionC + + is an object-oriented programming language evolved from the development of C language. The object-oriented program design method encapsulates the data and the operation methods of the data as an interdependent and inseparable whole-object. Abstract the common object of the same type, forming a class. Classes are connected to the outside

With the development of economy and the progress of science and technology, intelligent robot is not a new thing. and the indoor service robot as a newly developed industry, gradually become the current industry, from the earliest start of the sweep robot, family accompany robot, feeding robot, etc. into the public eye. How to realize the autonomous positioning and navigation of mobile robot in uncertain environment has always been a core problem of

To create an autonomous transaction, you must use the PRAGMAAUTONOMOUS_TRANSACTION statement in PLSQL at the highest level of the anonymous block or in the stored procedure, function, data packet, or trigger definition section. SQL Server statements executed in such a module or process are autonomous. Example: createorreplacefunctionsms_send (v_mobile To create an auto