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Advantages and disadvantages of MyBatis
After using the MyBatis framework, compared to the previous Hibernate framework, the individual felt mybatis the advantages of a lot of, at least more simple than hibernate easy to use.
Separation of SQL statements from codeBenefits: Easy to manage and maintainDisadvantage: Not easy to debug, need to use log tool to get in
A
Disadvantages:
1. Portability is the biggest drawback of stored procedures and triggers.
2, occupy the server side too many resources, to the server caused a lot of pressure
3, can not do DDL.
4, the trigger scheduling error is difficult, and the data is easily inconsistent, late maintenance inconvenient.
Advantages:
1, precompiled, has been optimized, high efficiency. Avoids the inefficiency of SQL st
with transaction semantics in bean code. In both cases, the container manages the transaction and determines whether the given transaction should be committed.
5, based on the components of the design. Entity beans are designed to contain components that are configured with deployment descriptors and can be deployed to any Java EE application Server without changing any code.
In summary, the advantage of entity beans is that they can benefit from standardization and industry best practices, s
Summary of advantages and disadvantages of ORACLE five tables:1, Normal table (heap table): Suitable for most design scenarios, there are advantages and disadvantages.Advantages:A, the syntax is simple and convenientb, suitable for most scenesDisadvantages:A, the update log cost is largeB,delete Cannot free space (HWM high water mark does not drop)C, table record
This article focuses on the details of Ajax, the origin of Ajax, the principle of Ajax, and the advantages and disadvantages of Ajax. Now let's see this article together.
What is Ajax
In fact, Ajax already belongs to the old technology, and now almost no one will use, here is mainly the bottom of the things to share with you, in case of loading the interviewer.
Ajax, "Asynchronous JavaScript and XML" (Async
version determines the stability of the RAC operation. It is important for database engineers and hardware engineers to have extensive environmental checks, validations, and extensive testing after deployment before installing the configuration. Second, high-performanceHigh performance is also a major headache for migrating from a single machine environment to a RAC environment, and RAC is not a high-performance solution. In the current hardware environment of gigabit Network, many times the s
, XMLHttpRequest allows us to read and write data on the server without reloading the page, minimize user input.
Ajax separates web interfaces from applications (data and presentation). In the past, there was no clear boundary between the two, and the separation of data and presentation, it is conducive to the division of labor and cooperation, reduces web application errors caused by non-technical staff modification, improves efficiency, and is more suitable for the current release system. Yo
very effective, and can be rewritten and encapsulated as needed, which is simple and practical. (8). high scalability. Jquery provides an extension interface: jquery. Extend (object). You can add new functions to the jquery namespace. All jquery plug-ins are developed based on this extension interface.
3. Advantages and Disadvantages of jquery (1) Advantages of
queues as an embedded list to meet real-time high concurrency requirements. In the process of processing data of an e-commerce type, queues related to commodities, hot sales, and recommended sorting are usually stored in redis, during which storm is also expanded to read and update the redis list.
For a detailed example, refer to another blog post of this ID: Storm [topn] sorting. The storm-redis-pubsub interface is used during this period.3 advantages
, the structural overhead of the linked list occupies most of the storage space. Therefore, in terms of the storage density of nodes, the storage space usage of the sequence table is high.
Because a sequence table needs to pre-allocate a certain length of storage space, if you do not know the approximate length of the linear table in advance, it is possible to pre-allocate a large amount of storage space, as a result, a large part of the storage space is not fully utilized during program executi
Advantages: 1. Decoupling the target class and adaptation Class 2. Increasing class transparency and reusability, and encapsulating specific implementations in the adaptation class, the client class is transparent and improves the reusability of the adapter. 3. The flexibility and scalability are very good. The class adapter conforms to the open/closed principle and has the following advantages: 1. Because
Advantages and disadvantages of Indexes
Why create an index? This is because creating an index can greatly improve the system performance. First, you can create a unique index to ensure the uniqueness of each row of data in the database table. Second, it can greatly speed up data retrieval, which is also the main reason for creating an index. Third, it can accelerate the connection between tables, especial
Advantages and disadvantages of objective-c languageOBJC Advantages:1) cateogies2) posing3) Dynamic identification4) Indicator calculation5) Flexible Message delivery6) Not an overly complex C-derived language7) Objective-c and C + + can be mixed programmingDisadvantages:1) name space not supported2) operator overloading not supported3) Multiple inheritance not s
overhead in a linkedlist structure because it stores information about the 1000 entity objects.ArrayList uses a built-in array to store elements, and the starting capacity of this array is 10. When the array needs to grow, the new capacity is obtained as follows: the new capacity = (old capacity *)/2+1, which means that each capacity will probably increase by 50%. This means that if you have a ArrayList object with a large number of elements, then eventually there will be a lot of wasted space,
Asynctask implementation of the principle and the advantages and disadvantages of applicationAsynctask, a lightweight asynchronous class provided by Android, can directly inherit Asynctask, implement asynchronous operations in a class, and provide interface feedback about the current level of asynchronous execution (UI Progress updates can be implemented via interfaces). The final feedback executes the resu
The author thinks that the stored procedure is a bunch of SQL merging. The middle adds a bit of logic control.However, stored procedures are more practical when dealing with complex business.For example, a complex data operation. If you're working at the front desk. Multiple database connections may be involved. But if you use stored procedures. It's only once. There are advantages in response time.This means that stored procedures can give us the ben
First, why do you want to create an index (advantage)?This is because creating an index can greatly improve the performance of the system.First, by creating a unique index, you can guarantee the uniqueness of each row of data in a database table.Second, it can greatly speed up the retrieval of data, which is the main reason for creating indexes.Thirdly, the connection between tables and tables can be accelerated, particularly in terms of achieving referential integrity of the data.Finally, when
Advantages and disadvantages of indexes
Why create an index? This is because creating an index can greatly improve the system performance. First, you can create a unique index to ensure the uniqueness of each row of data in the database table. Second, it can greatly speed up data retrieval, which is also the main reason for creating an index. Third, it can accelerate the connection between tables, especial
[Discussion] let's talk about the advantages and disadvantages of using stored procedures in php + mysql. I have never seen some open-source systems in projects, and I have never used stored procedures as SQL nbsp; is it necessary to use the stored procedure in the php project; reduces the load on web servers, but increases the load on database servers. for personal understanding, let's talk about this and
[Discussion] let's talk about the advantages and disadvantages of using stored procedures in php + mysql. I have never seen some open-source systems in projects, and I have never used stored procedures as SQL nbsp; is it necessary to use the stored procedure in the php project; this reduces the pressure on web servers. For more information, see the advantages an
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