AllErrorInOne

In c++, you have to determine which type of data T holds during compile time otherwise. It will throw,  template argument deduction/substitution failed:                              couldn't deduce template parameter 'E' ADS_set<size_t> a; a.w<size_t>();           // This way size_t will be reside in the template

 For creating spring MVC there are five steps: 1) Configure the dispatcher servlet in the web.xml < servlet > < servlet-name >spring</ servlet-name > < servlet-class >org.springframework.web.servlet.DispatcherServlet</ servlet-class > </ servlet > < servlet-mapping > < servlet-name >spring</ servlet-name > < url-pattern >/</ url-pattern > </ servlet-mapping > 2) Create spring configuration file e.g spring-servlet.xml         --The starting name of spring configuration file should be same as servlet-name above: spring              and the servlet behind. 3) Configure view resolver, it will be declare as bean inside spring configuration file. < bean class ="org.springframework.web.servlet.view.InternalResourceViewResolver" name ="viewResolver" > < property name ="prefix" value ="/WEB-INF/views/" /> < proper...

  ProductDao required HibernateTemplate object HibernateTemplate need SessionFactor object through LocalSessionFactorBean LocalSessionFactoryBean need dataSource, HibernateProperties, AnnotatedClass ProductDAO required HibernateTemplate .  HibernateTemplate has all the method required for CRUD operation. HibernateTemplate r equire SessionFactory. Since SessionFactory interface we have to give LocalSessionFactoryBean.  LocalSessionFactorBean require DataSource, HibernateProperties, AnnotatedClass. Dependencies are springorm, mysql-connector-java, hibernate @Transcational should be used before a method with has write operation and configure HibernateTranscationManager in xml like below. This is how it is set <? xml version ="1.0" encoding ="UTF-8" ?> < beans xmlns ="http://www.springframework.org/schema/beans" xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx ="http://www.springframework.org/schema/...

  CREATE TABLE employee ( emp_id int primary key , first_name varchar ( 40 ), last_name varchar ( 40 ), birth_day DATE , sex VARCHAR ( 1 ), salary INT , super_id INT , branch_id INT ); CREATE TABLE branch ( branch_id INT PRIMARY KEY , branch_name VARCHAR ( 40 ), mgr_id INT , mgr_start_date DATE , FOREIGN KEY ( mgr_id ) REFERENCES employee ( emp_id ) ON DELETE SET NULL ); ALTER TABLE employee ADD FOREIGN KEY ( branch_id ) REFERENCES branch ( branch_id ) ON DELETE SET NULL ; ALTER TABLE employee ADD FOREIGN KEY ( super_id ) REFERENCES employee ( emp_id ) ON DELETE SET NULL ; CREATE TABLE client ( client_id INT PRIMARY KEY , client_name VARCHAR ( 40 ), branch_id INT , FOREIGN KEY ( branch_id ) REFERENCES branch ( branch_id ) ON DELETE SET NULL ); CREATE TABLE works_with ( emp_id INT , client_id INT , total_sales INT , PRIMARY KEY ( emp_id , client_id ), FOREIGN KEY ( emp_id ) REFERENCES employee ( ...

Simple example of using std::function  #include <functional> #include <iostream> int sum ( int x , int y , int z ){ return x + y ; } int check ( std :: function < int ( int , int , int )> & s , int x , int y ){ return s ( x , y ); } int main (){ std :: function < int ( int , int , int )> s ( sum ); std :: cout << check ( s , 10 , 20 ) << std :: endl ;     // Here a datatype of std::function is define and passed to check,    // which returns int and takes     // three argument int, int, int types } To Create a std::function with template example: template < class E > bool h ( const E & par1 ){ std :: cout << "This is correct" ; return true ; } template < class E > E z ( std :: function < bool ( const E &)> F ){ } int main (){ std :: function < bool ( const int &)> v ( h < int >); std :: cout << v ( 10...

For using SpringJDBC, we have two class a) JdbcTemplate b)DriverManagerDataSource In DriverManagerDataSource, we have to give the property of url, drivername, username and password and create a bean with it. We inject the bean of DriverManagerDataSource to JdbcTemplate. We have all the method in JbbcTemplate for creating, inserting  deleting in database. update() -> is used for insert, update, delete execute() -> select It is inserted like this: String query = "insert into student(name, address) values ( ? , ? )" ; int result = jdbcTemplate . update ( query , s . getName (), s . getAddress ()); Updating and deleting is same as inserting but with different query. public int update ( Student s ) { String query = "UPDATE student SET name= ? , address= ? WHERE id= ? " ; int result = jdbcTemplate . update ( query , s . getName (), s . getAddress (), s . getId ()); return result ; } public int delete ( int studentId ) { String query = "DELETE...

Beans can be created in three ways 1) using xml configuration 2) using @Component 3) using @Bean When using @Component, component should be scan in either xml or in configuration java class . To remove xml file and create  bean from java class: @Configuration is used in one java class @ComponentScan is used to scan packages, when @Component is used to create bean other wise not required this. To declare the context with java class: ApplicationContext context = new AnnotationConfigApplicationContext(javaConfig.class); @Bean({"name1", "name2"}) public Student getStudent() { return new Student(); } Bean can be given any name. The default name is getStudent for this bean.

  SpelExpressionParser spelExpressionParser = new SpelExpressionParser (); Expression expression = spelExpressionParser.parseExpression("22+44"); System.out.println(expression.getValue()); It can be used like that, In @Value("#{give the expression}") Expression language is used with classes, variables, methods, constructors, and objects As well as with char, numeric, operators, keywords and special symbols which returns a value                                         To Call Static Method and Variable inside expression language T(Class).method(param), T(class).variable class should be full class path e.g  T( java.lang.Math ). sqrt (25); T(java.lang.Math).E                             To Create Objects new Object(value) e.g:    @Value ( "#{new jav...

it's of five type: a)singleton b)prototype c)session d)requests e)global session -> singleton is by default. so the hash code of all singleton object will be same.     it can be changed in two ways:      1)In config file:  <bean class ="" name="" scope=""/>      2)Under @Component                    @Scope("")    scope is only used with component. -> prototype: every time new object is give and has different hash code

@Component, @Value @Component is use to declare object of class like bean declaration, and bean name can specify in @Component("here"). Base class should be specify through context: <context:component-scan base-package="com."/> IoC will scan the base package and its sub package as well. @Value is used to give the value directly. For eg: For Collection, declare in xml file with util and use id #{id} inside @Value("#{id}") @Component public class Student { @Value ( "H" ) private String studentName ; @Value("Ktm") private String city; @Value("#{temp}") private List<String> address; }

To use standalone collection use xmlns:util ="http://www.springframework.org/schema/util" along with its schema location:   http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd After this simply use in .xml file like this:   < util :list list-class ="java.util.LinkedList" id ="myBestFriends" > < value >Tore</ value > < value >Amrit</ value > < value >Arun</ value > </ util :list > < bean class ="com.mountech.collection.Person" name ="person" > < property name ="friends" > < ref bean ="myBestFriends" /> </ property > </ bean >

-> it is used to inject dependencies automatically -> it can't be used to inject primitive and string values, it works with reference only. It can be done by two ways: 1)XML 2)ANNOTATION With XML:     Autowiring can be done in           a)byName          b)byType          c)constructor          d)autodetect- -It is deprecated since spring 3 With Annotations:         a)Autowired          b)Qualifier                                  Autowiring  of Bean in xml  Object can be decleared in two ways: This two are same: Either cast the bean or give the bean class: Emp  emp  =  context . getBean ( "emp" ,  Emp . class ); Emp emp = (Emp)context.getBean("emp); "When using byName"...

Whenever a single bean object is created in a this config file, all of the beans declared in this file will be created. Using setter-------------------   <bean class="" name="" init-method="" destroy-method="">      <properties name="">          <value>            //give value here          </value>     </properties> </bean> or <bean class="" name="" init-method="" destroy-method="">     <properties name="" value="">     </properties> </bean> or <bean class="" name="" p:nameOfVariable="" init-method="" destroy-method=""/>          //this is using p schema Using constructor  Using setter-------------------  <bean class="" name="" init-method="" destroy-method="">     <constructor-args name="">       ...

1) Search for gnome dash dock extension in google. https://extensions.gnome.org/extension/307/dash-to-dock/   Go to this link and turn it on , then it ll be downloaded. Go to tweak and turn on dash to dock setting . I am ready to go.

   D isabling wayland in /etc/gdm/custom.conf then relogin. https://github.com/debauchee/barrier/issues/479

 Press space continuously on booting to get window for recovery, Go to recovery, And to change password go to this link https://support.system76.com/articles/password-pop/?fbclid=IwAR2er2n_lpo2ErOoaN6ZF1HCW1dr-vFOz5WeM9FgDunwMTCRMN-9LnGVlrI To go to terminal without recovery, Press current pop os , then esc , then ctrl + alt +f5. Enter user name and password. Install graphics for desktop and file system, sudo apt-get install --reinstall ubuntu-desktop Search for file system installation command in google and enter.