hcl review

Daily--SPRINGMVC system architecture and process Review of program apes Web development has been going on for a long time, and it's almost more than 10 years in the country. From the very beginning of the process level to the present MVC has undergone a lot of improvements and optimizations, this article mainly review the knowledge of spring MVC.Development History first stage CGI process response At this

Summary of the review of database principlesdatabase technology is the main research on how to organize and store data, efficient acquisition and processing of data, and can meet the needs of a variety of users of information technology, because the requirements of the database technology is very large, so learning this course of knowledge and technology is very necessary, should be skilled to understand, master Data , data management, database, data

Label:Database Review ④ June 15, 2016 21:34 Main Logical Data Model (LDM) logical 1. Three elements of the logical data model: Data Structure data structure Data Operation manipulation Data Constraints constraints 2. History of the relational model E.f.codd, a researcher of IBM company, proposed relational model in 1970 Proposed the Relational-algebra Propose relational algebra Defined the 1st, 2nd, and 3rd Normal Forms

Database Review ⑩June 19, 201613:40Main Transactions TransactionThe concept of 1.Transaction Concept transactionsA transaction is a unit of program execution that accesses and possibly updates various data items.A transaction is a unit of concurrency control and is a user-defined sequence of operations. These operations are either done or not, and are an inseparable unit of work. With transactions, SQL Server can bind a logically related set of operat

Label:Database Review ⑨ June 19, 2016 12:45 Main Database Programming 1. Introduction of Transact-SQL Transact-SQL is the language used by the application to interact with SQL Serverdbms. Transact-SQL = high-level programming language can apply Transact-SQL to database programming to realize data processing function Variables in the 2.transact-sql Local variables: A local variable is a user-defined variable whose scope is limited to the inside of the

Tags: varchar uniq review weight Zhang Mowgli add PNG code CREATE databaseAfter the cmd command to enter the database, you need to manually do some operations on the database Create a database plus a semicolon MySQL>Createdatabase myfirstdatabase; View the database you created plus s and semicolons MySQL>show Databases; Select the database plus semicolon to use MySQL> use myfirstdatabase; Create a database table plus a semicolon, and add character fo

Originally learned time, quite smooth, did not expect to use again, or encountered a lot of problems, resulting in the failure of the update, so, can only reconstruct the migration, so as not to look at the chaos.First, delete the migration, restore the data to the (a) End state1. Delete Folder2. Delete a table3. Delete Columns4. Comment out the newly added attributesSecond, re-operation EF6 in the original database using Codefirst Total review (secon

Tags: name login list Practice COM label Message Info user A bit with the original database in the use of codefirst far, but always review it, must be comprehensive point. One, insert two users in the user table (users) Second, generate the Post interface MVC generates a lot of interfaces and doesn't use Ajax, which is rarely used in real-world development, just for demonstration purposes. But no matter what the build, attributes, entity objects, etc

This is my second blog in 51, mainly to review my it career, first after graduation I engaged in ERP development, involving large enterprises of human resources management, logistics management, production management, finance and other fields, the front desk will make form, report. The background will write stored procedures and so on. In the software development process I participated in the whole process of software including: Demand research, summa

Disclaimer: This article is for the author to review the database course with a simple record of notes, if there are errors, please point out, thank you.First, the theoretical basis1. non-destructive connectivity (Lossless join): Set relationship mode R (u,f) is decomposed into several relational patterns R1 (U1,F1), R2 (U2,F2), ..., Rn (UN,FN), where u=u1u2 ... Un, and there is no Unuj, FI is the projection of F on the UJ, if R is equal to the result

Review database Connection pool: C3P0, DBCP1, the advantages of database connection pooling technology:• Resource reuse:Due to the reuse of database connections, there is a high performance overhead associated with frequent creation and release of connections. On the basis of reducing the system consumption, on the other hand, it also increases the stability of the system operating environment.• Faster system response Speed:Database connection pooling

"Cleanmymac" and run to clean up binary code, system cache, logs, language, garbage, garbage, etc. CLEANMYMAC also has device management, fast and permanent erase and extension manager, while allowing for custom appearance modifications. Currently, the clean My mac contains more than 50 features in maintenance, monitoring, cleaning, utilities and feedback categories.Cleanmymac and MacKeeperAny good "Cleanmymac" commentary will compare it to its biggest competitor, MacKeeper, and that's why I'm

=============================================================================VI/VIM Command Review and Practice:---------------------------------------The Command mode yy copies the contents of the line where the cursor is located 4yy the copy cursor is located on the line starting with the 4 line of content p paste dd Delete/cut the contents of the line where the cursor is located 2DD Delete/The cut cursor is located on the line where the 2-row cont

Tags: database view sqlDatabase review concept of CH6 view 6.1 viewA view is a virtual table that is exported from one or more tables (or views), and the DBMS only holds the definition of the view in the data dictionary , and the view's data is still actually stored in the base table where it was exported The basic statements for defining views in Tutorial D are as follows: view_name> VIEW (relational_condition>) {property_list>}; So what does a view

Tags: database transaction SQL SQL transactionDatabase review CH13 Transaction 13.1 ConceptsA transaction is a series of database operations performed as a single logical unit of work that may modify multiple tuples in multiple tables The structure of the normal execution of a transaction is: begin; 1 2 ... SQL execution N commit; The BEGIN flag starts a transaction, and multiple SQL statements are transactional logical units of work, commit(commit) i

Database Review CH2 Database Architecture 2.1 Database Architecture hierarchyA database architecture can be divided into 3 tiers: External level Conceptual hierarchy Internal level The external hierarchy refers to the interface that each user accesses the database in different high-level languages, the representation of the conceptual hierarchy database information, and the definition of the module (including security and integri

Code review". What is code review Code Review, or "code review," is the basic idea of an effective discovery of the flaws in the code by someone else reviewing his code after the developer has written his or her own code. One of the basic theories of code review is that th

Peer Review (peer review, also known as refereeing in some academic fields), or peer review , is an academic results review process whereby an author's academic work or plan is reviewed by other experts and scholars in the same field. The general academic publishing units are mainly peer-reviewed methods to choose and

Everyone acknowledges that Code Review is costly and time-consuming, especially when software projects are sent to the software testing department. For some developers, it will lead to more office politics and gossip. A code review may gradually improve the code. If you think that you have only slightly improved the software from a valid code review, you need to

Original ENGLISHOriginal post address In the previous articleArticleAs mentioned in, I am no longer working in Google. I have not figured out where to go-there are two or three very good job opportunities in front of me. Because during this decision period, I was no longer employed by anyone. I wanted to write something professional, something interesting, however, it also causes tension between colleagues and management work. Google is a very good company. They have made a lot of commendabl