java database interview questions

Account can further unify the connection string, but this poses a security risk to the system. Interview question 46Which two methods does ADO. NET support to access relational databases?ADO. NET supports two database access methods: Connection and offline. The connector is suitable for reading large data volumes and cannot accurately predict the number of records to be read. The offline connector is more

Android interview questions (2) and android interview questions 1. What is the difference between int and Integer? Java provides two different types: The reference type and the original type (or the built-in type ). Int Is the original data type of

100 Interview Questions for Software Developers Hiring smart software developers is not easy.If you're not careful you might end up hiring a bunch of moronicMandrills, like I did last year. And you don't want that. Trust me.Stand-up meetings are very hard to do in a tree. The key is to askChallenging questionsThat enable you to distinguish the smart software developers fromMoronic mandrills. And to help yo

it proxies back to the connection pool.9, why to use What's the difference between ORM and JDBC?ORM is the idea of turning object into a record in a database, or turning records in a database into OBJECDT, and we can use JDBC to realize this idea,In fact, if our project is written in a strictly oop way, our JDBC program is already working on the ORM, whether intentionally or unintentionally. Now there are

Tags: operation lib Java check size tran detail efficient correlationThe relevant knowledge of database, in the interview also often appeared, I think it is necessary to the relevant summary of this kind of knowledge.1. IndexAn index is a structure that sorts the values of one or more columns in a database table, and i

. Take a look at how to generate a globally unique ID, refer to: (1) http://www.cnblogs.com/baiwa/p/5318432.html (2) http://blog.csdn.net/houkai6/article/details/17713845 2. 3. How does the database implement the transaction?4, database and cache inconsistency problem Resolution of the DB-to-cache mismatch problem: (1) "Two elimination law" adds a record to the cache while adding data to the

Interview Questions: Differences and connections between distributed and cluster, Interview Questions Cluster I. Differences:In a word, distributed systems work in parallel, and clusters work in tandem.1. Distributed refers to the distribution of different services in different places. A cluster refers to the combinat

Introduction to common interview pen questions, interview pen questions 1. # include # Include Using namespace std; Void main () { Int c = 5; If (c ++ = 5) { Printf ("% d \ n", c --); Printf ("% d", c ); } Else { Printf ("% d", c ++ ); } System ("pause "); } A

Hadoop interview questions (1) and hadoop interview questions I. Q : 1. Briefly describe how to install and configure an apache open-source version of hadoop. You only need to describe it. You do not need to list the complete steps and the steps are better. 1) install JDK and configure environment variables (/etc/profi

': ' Simplestrategy ', ' Replication_factor ': 3};");B. Create a table:Session.execute (" CREATE TABLE simplex.songs (" + " ID uuid PRIMARY KEY," + " title text," + "album text," + "artist text," + "tags set c. Inserting data:Session.execute ( "INSERT into Simplex.songs (ID, title, album, Artist, Tags)" + " VALUES (" +

= mysql_query("SELECT * FROM user WHERE country = ‘China‘"); if0) { ... } // 有效率的： $r = mysql_query("SELECT 1 FROM user WHERE country = ‘China‘ LIMIT 1"); if0) { ... } 4. Jianjian Index for search wordsRefer to Java interview Preparation 15: Database--Index 5. Use a fairly typed example in the Join table and index itIf your application has many join que

;CallableStatement st = null;Try {It's better not to do this, because the driver's name is written dead in the program.Class.forName ("Com.mysql.jdbc.Driver");In the actual project, datasource data is applied here, if the frameworkThis data source does not need our code to create, we only need to datasourceds=context.lookup ();conn = Ds.getconnection ();conn = Drivermanager.getconnection ("Jdbc:mysql:///test", "root", "root");st = Conn.preparecall ("{Call Insert_student (?,?,?)}");St.registerout

Android interview questions, android interview1. How to Improve the sliding efficiency of ListView2. Let's talk about the architecture of the project package (networking, parsing, activity, database ).3. how to load a large number of images (including small images and big charts), how to reduce the number of connections to the server at a time, and how to cache i

(Various companies interview original questions) online has done a set of CC ++ integrated test questions, also to test your level (2), cc integrated test questions I have read the last 10 questions and sent them to me. The following is a question, and I have some understan

. number of nodes in the k-layer of a binary tree 12. Number of leaf nodes in a binary tree 13. reconstruct a binary tree by means of forward and middle Traversal 14. reconstruct a binary tree by means of central and post-order traversal 15. Maximum Distance between two nodes in a binary tree 16. path of a binary tree and a specific value 17. Calculate the minimum common ancestor node of the two nodes in the binary tree. Package com. sheepmu; import jav