16. What are the new features introduced in SQL Server 2000 (or the latest release of SQL Server at the time of your interview)? What changed between the previous version of SQL Server and the current version?
An ORM library is written in our language of choice and encapsulates the code needed to manipulate the data. Therefore we don’t need to directly use the SQL; we can interact instantly with an object from our code, instead of a database table. The ORM tool translates the interaction into ...
3. Execute an sql statement 4. Process the results 5. Close the connection Before doing these do import java.sql.* JDBC is java based API for accessing data from the relational databases. JDBC provides a set of classes and interfaces for doing various database operations. The steps are: Re...
14) What is the difference between function and procedure in SQL? A function returns a single value that, as it were, becomes an element in queries. A procedure sends back some realization of itself in terms of performance and various tasks. 15) What is a composite key in SQL? It consis...
importjava.sql.*; classDbmd{ publicstaticvoidmain(String args[]){ try{ Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=DriverManager.getConnection( "jdbc:oracle:thin:@localhost:1521:xe","system","oracle"); DatabaseMetaData dbmd=con.getMetaData(); ...
Mybatis框架中的mapper方式中的#也能很大程度的防止sql注入($无法防止sql注入)。 4、MySQL性能优化有哪些? ● 当只要一行数据时使用limit 1 查询时如果已知会得到一条数据,这种情况下加上limit 1会增加性能。因为MySQL数据库引擎会在找到一条结果停止搜索,而不是继续查询下一条是否符合标准直到所有记录查询完毕。
//howtodoinjava.com/java/collections/useful-java-collection-interview-questions/ 11. Difference between sleep and wait? //howtodoinjava.com/2013/03/08/difference-between-sleep-and-wait/ 12. Also asked some sql queries. Practice yourself. ...
例如在关系数据库中,一个事务可以是一条 SQL 语句、一组 SQL 语句或整个程序。简单举个例子就是你要同时修改数据库中两个不同表的时候,如果它们不是一个事务的话,当第一个表修改完,可是第二表改修出现了异常而没能修改的情况下,就只有第二个表回到未修改之前的状态,而第一个表已经被修改完毕。而当你把...
Looking forward to appear in Java Interview, here are the key Java Interview Questions with Answers only for you. - aatul/Java-Interview-Questions-Answers
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