Spring Boot 2 Guru :

Part 2 Advanced Configuration : section Auto-configuration
Signed-off-by: m.benhassine <med.ingenieur@gmail.com>

spring-boot-basic/pom.xml

@@ -19,9 +19,17 @@
     </properties>
 
     <dependencies>
+
+         <!--previous spring-boot-starter deleted -->
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter</artifactId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.hsqldb</groupId>
+            <artifactId>hsqldb</artifactId>
         </dependency>
 
         <dependency>
@@ -29,6 +37,7 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+
     </dependencies>
 
     <build>

spring-boot-basic/src/main/java/com/java/ways/boot/basic/Blog.java

+package com.java.ways.boot.basic;
+
+public class Blog {
+
+    private long id;
+    private String name;
+
+    public String getMail() {
+        return mail;
+    }
+
+    public void setMail(String mail) {
+        this.mail = mail;
+    }
+
+    private String mail;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Blog(long id, String name, String mail) {
+        this.id = id;
+        this.name = name;
+        this.mail = mail;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+
+    @Override
+    public String toString() {
+        return String.format(
+                "Blog[id=%d, name='%s', mail='%s']",
+                id, name, mail);
+    }
+
+
+}

spring-boot-basic/src/main/java/com/java/ways/boot/basic/SpringBootBasicApplication.java

 package com.java.ways.boot.basic;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.jdbc.core.JdbcTemplate;
 
 import java.util.Arrays;
 
 @SpringBootApplication
 public class SpringBootBasicApplication {
 
+    private static final Logger log = LoggerFactory.getLogger(SpringBootBasicApplication.class);
+
+    public static final String QUERY = "SELECT * from T_BLOG";
 
     public static void main(String[] args) {
-        SpringApplication.run(SpringBootBasicApplication.class, args);
-        System.out.println("Welcome to this first basic spirng boot project ,  amazing features are coming  soon :) ");
-    }
+        ApplicationContext ctx = SpringApplication.run(SpringBootBasicApplication.class, args);
 
+       JdbcTemplate jdbcTemplate = ctx.getBean(JdbcTemplate.class);
+        jdbcTemplate.query(
+                QUERY,
+                (rs, rowNum) -> new Blog(rs.getLong("id"), rs.getString("name"), rs.getString("mail"))
+        ).forEach(blog -> log.info(blog.toString()));
+    }
 
     // This Beans  runs on start up
 
@@ -24,7 +34,7 @@ public class SpringBootBasicApplication {
     public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
         return args -> {
 
-            System.out.println("Let's discover automatically  Spring Boot created Beans :");
+            System.out.println("Let's discover default Spring Boot created Beans :");
 
             String[] beanNames = ctx.getBeanDefinitionNames();
             Arrays.sort(beanNames);

spring-boot-basic/src/main/resources/application.properties

+# Populate the  database with test data
+spring.datasource.schema=/db/schema.sql
+spring.datasource.data=/db/data.sql

spring-boot-basic/src/main/resources/db/data.sql

+insert into T_BLOG (ID, NAME, MAIL) values ('11', 'JAVA-WAYS.COM', 'med.ingenieur@gmail.com');
+insert into T_BLOG (ID, NAME, MAIL) values ('22', 'JAVA', 'java@gmail.com');
+insert into T_BLOG (ID, NAME, MAIL) values ('33', 'TUNISIA.COM', 'tunsianWay@gmail.com');
+
+
+
+

spring-boot-basic/src/main/resources/db/schema.sql

+drop table T_BLOG if exists;
+
+create table T_BLOG (ID integer identity primary key,  NAME varchar(50) not null, MAIL varchar(50) not null );
+

spring-boot-basic/src/test/java/com/java/ways/boot/basic/SpringBootBasicApplicationTests.java

@@ -2,24 +2,16 @@ package com.java.ways.boot.basic;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.junit4.SpringRunner;
 
-import static org.junit.Assert.assertNotNull;
-
-
 @RunWith(SpringRunner.class)
 @SpringBootTest
 public class SpringBootBasicApplicationTests {
 
-    @Autowired
-    private BasicBean basicBean;
-
+	@Test
+	public void contextLoads() {
+	}
 
-    @Test
-    public void contextLoads() {
-        assertNotNull(basicBean);
-    }
 }