in memory dbs config (#1551)

* in memory dbs config

* small fix

spring-data-rest/pom.xml

@@ -14,7 +14,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>1.5.1.RELEASE</version>
+        <version>1.5.2.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
@@ -42,6 +42,26 @@
             <artifactId>h2</artifactId>
         </dependency>
 		
+		<!--
+        <dependency>
+            <groupId>org.hsqldb</groupId>
+            <artifactId>hsqldb</artifactId>
+            <version>${hsqldb.version}</version>
+        </dependency>
+        
+        <dependency>
+            <groupId>org.apache.derby</groupId>
+            <artifactId>derby</artifactId>
+            <version>${derby.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.xerial</groupId>
+            <artifactId>sqlite-jdbc</artifactId>
+            <version>${sqlite.version}</version>
+        </dependency>
+        -->
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>

spring-data-rest/src/main/java/com/baeldung/config/DbConfig.java

@@ -0,0 +1,61 @@
+package com.baeldung.config;
+
+import java.util.Properties;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+
+//@Configuration
+@EnableJpaRepositories(basePackages = "com.baeldung.repositories")
+// @PropertySource("persistence-h2.properties")
+// @PropertySource("persistence-hsqldb.properties")
+// @PropertySource("persistence-derby.properties")
+public class DbConfig {
+
+    @Autowired
+    private Environment env;
+
+    @Bean
+    public DataSource dataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(env.getProperty("driverClassName"));
+        dataSource.setUrl(env.getProperty("url"));
+        dataSource.setUsername(env.getProperty("user"));
+        dataSource.setPassword(env.getProperty("password"));
+        return dataSource;
+    }
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(dataSource());
+        em.setPackagesToScan(new String[] { "com.baeldung.models" });
+        em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
+        em.setJpaProperties(additionalProperties());
+        return em;
+    }
+
+    final Properties additionalProperties() {
+        final Properties hibernateProperties = new Properties();
+        if (env.getProperty("hibernate.hbm2ddl.auto") != null) {
+            hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        }
+        if (env.getProperty("hibernate.dialect") != null) {
+            hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
+        }
+        if (env.getProperty("hibernate.show_sql") != null) {
+            hibernateProperties.setProperty("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
+        }
+        return hibernateProperties;
+    }
+
+}

spring-data-rest/src/main/java/com/baeldung/models/Address.java

@@ -3,6 +3,7 @@ package com.baeldung.models;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.OneToOne;
 
@@ -10,7 +11,7 @@ import javax.persistence.OneToOne;
 public class Address {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy=GenerationType.IDENTITY)
     private long id;
 
     @Column(nullable = false)

spring-data-rest/src/main/java/com/baeldung/models/Author.java

@@ -6,6 +6,7 @@ import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.JoinTable;
@@ -15,7 +16,7 @@ import javax.persistence.ManyToMany;
 public class Author {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy=GenerationType.IDENTITY)
     private long id;
 
     @Column(nullable = false)

spring-data-rest/src/main/java/com/baeldung/models/Book.java

@@ -5,6 +5,7 @@ import java.util.List;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToMany;
@@ -14,7 +15,7 @@ import javax.persistence.ManyToOne;
 public class Book {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy=GenerationType.IDENTITY)
     private long id;
 
     @Column(nullable = false)

spring-data-rest/src/main/java/com/baeldung/models/Library.java

@@ -5,6 +5,7 @@ import java.util.List;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.OneToMany;
@@ -16,7 +17,7 @@ import org.springframework.data.rest.core.annotation.RestResource;
 public class Library {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy=GenerationType.IDENTITY)
     private long id;
 
     @Column

spring-data-rest/src/main/resources/persistence-derby.properties

@@ -0,0 +1,8 @@
+driverClassName=org.apache.derby.jdbc.EmbeddedDriver
+url=jdbc:derby:memory:myD;create=true
+username=sa
+password=
+
+hibernate.dialect=org.hibernate.dialect.DerbyDialect
+hibernate.show_sql=true
+hibernate.hbm2ddl.auto=create-drop

spring-data-rest/src/main/resources/persistence-h2.properties

@@ -0,0 +1,8 @@
+driverClassName=org.h2.Driver
+url=jdbc:h2:mem:myDb;DB_CLOSE_DELAY=-1
+username=sa
+password=
+
+hibernate.dialect=org.hibernate.dialect.H2Dialect
+hibernate.show_sql=true
+hibernate.hbm2ddl.auto=create-drop

spring-data-rest/src/main/resources/persistence-hsqldb.properties

@@ -0,0 +1,8 @@
+driverClassName=org.hsqldb.jdbc.JDBCDriver
+url=jdbc:hsqldb:mem:myDb
+username=sa
+password=
+
+hibernate.dialect=org.hibernate.dialect.HSQLDialect
+hibernate.show_sql=true
+hibernate.hbm2ddl.auto=create-drop

spring-data-rest/src/main/resources/persistence-sqlite.properties

@@ -0,0 +1,4 @@
+driverClassName=org.sqlite.JDBC
+url=jdbc:sqlite:memory:myDb
+username=sa
+password=sa