Spring questions added

README.md

@@ -12,4 +12,11 @@
 - [W3 Schools](https://www.w3schools.com/sql/sql_null_values.asp) - sql null values
 - [Digital Ocean](https://www.digitalocean.com/community/tutorials/hibernate-native-sql-query-example) - hibernate native sql query example
 - [Java Guides](https://www.javaguides.net/2018/11/guide-to-hibernate-native-sql-queries.html) - hibernate native sql queries
-- [Baeldung](https://www.baeldung.com/java-dao-pattern) - Java DAO Pattern
+- [Baeldung](https://www.baeldung.com/java-dao-pattern) - Java DAO Pattern
+- [Rollbar](https://rollbar.com/blog/java-unknownformatconversionexception/) - unknown format conversion exception
+- [Spring Docs](https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/jdbc/datasource/AbstractDriverBasedDataSource.html#getCatalog()) - AbstractDriverBasedDataSource
+- [Stack Overflow](https://stackoverflow.com/questions/71130510/how-do-i-use-jdbc-template-to-query-a-select-where-first-letter-starts-with-sp) - jbdc template query where first letter starts with
+- [Stack Overflow](https://stackoverflow.com/questions/8247970/using-like-wildcard-in-prepared-statement) - using like wildcard in prepared statement
+- [Mkyong](https://mkyong.com/spring/spring-jdbctemplate-querying-examples/) - jdbctemplate querying examples
+- [Spring Docs](https://docs.spring.io/spring-framework/reference/integration/scheduling.html) - scheduling
+- [Stack Overflow](https://stackoverflow.com/questions/29832122/create-a-new-instance-of-component-in-spring-boot-framework) - create new instance of component in spring boot

Spring/MovieRepository.java

@@ -0,0 +1,42 @@
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.*;
+import org.springframework.stereotype.Repository;
+import javax.annotation.PostConstruct;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.*;
+import org.springframework.jdbc.core.BeanPropertyRowMapper;
+
+class Movie {
+    public String name;
+    public int year;
+    public int rating;
+
+    public Movie(String name, int year, int rating) {
+        this.name = name;
+        this.year = year;
+        this.rating = rating;
+    }
+}
+
+@Repository
+public class MovieRepository {
+
+    @Autowired
+    private JdbcTemplate template;
+
+    @PostConstruct
+    public void createTable() {
+        template.execute("CREATE TABLE movies (id bigint auto_increment primary key, name VARCHAR(50), year int, rating int)");
+    }
+
+    public void createMovie(String name, int year, int rating) {
+        template.update("INSERT INTO movies (id, name, year, rating) VALUES (?,?,?,?)", 
+                        null, name, year, rating);
+    }
+
+    public List<Movie> findMoviesByName(String nameStartsWith) {
+       return template.query("SELECT * FROM movies WHERE name LIKE '" + nameStartsWith + "%'", 
+              (rs, rowNum) -> new Movie(rs.getString("name"), rs.getInt("year"), rs.getInt("rating")));
+    }
+}

Spring/WeatherForecastService.java

@@ -0,0 +1,52 @@
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.config.ConfigurableBeanFactory;
+import org.springframework.context.annotation.*;
+import org.springframework.scheduling.*;
+import org.springframework.scheduling.annotation.*;
+import org.springframework.scheduling.concurrent.*;
+import org.springframework.stereotype.*;
+
+@FunctionalInterface
+interface TemperatureMeasurementCallback {
+    public void temperatureMeasured(int temperature);
+}
+interface Thermometer {
+    public int measure();
+}
+
+@Configuration
+@EnableScheduling // Test Case
+@Import({FakeThermometer.class, WeatherForecastService.class})
+class Config {
+
+    @Bean
+    public TemperatureMeasurementCallback callback() {
+        System.out.println("Registering TemperatureMeasurementCallback bean");
+        return (temperature) -> System.out.println(temperature);
+    }
+}
+
+@Component
+@Scope("prototype") // Test Case
+class FakeThermometer implements Thermometer {
+
+    private int currentTemperature = 21;
+
+    @Override
+    public int measure() { return currentTemperature++; }
+}
+
+@Service
+public class WeatherForecastService {
+
+    @Autowired
+    private Thermometer thermometer;
+    @Autowired
+    private TemperatureMeasurementCallback callback;
+
+    @Scheduled(fixedRate=50) // Test Case
+    public void takeTemperatureMeasurement() {
+        int temperature = thermometer.measure();
+        callback.temperatureMeasured(temperature);
+    }   
+}