Update README.md

persistence-modules/spring-persistence-simple/.gitignore

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+*.class
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+
+# Packaged files #
+*.jar
+*.war
+*.ear

persistence-modules/spring-persistence-simple/README.md

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+=========
+
+## Spring Persistence Example Project
+
+
+### Relevant Articles: 
+- [A Guide to JPA with Spring](https://www.baeldung.com/the-persistence-layer-with-spring-and-jpa)
+- [Bootstrapping Hibernate 5 with Spring](http://www.baeldung.com/hibernate-5-spring)
+- [The DAO with Spring and Hibernate](http://www.baeldung.com/persistence-layer-with-spring-and-hibernate)
+- [Simplify the DAO with Spring and Java Generics](https://www.baeldung.com/simplifying-the-data-access-layer-with-spring-and-java-generics)
+- [Transactions with Spring and JPA](https://www.baeldung.com/transaction-configuration-with-jpa-and-spring)
+- [Introduction to Spring Data JPA](http://www.baeldung.com/the-persistence-layer-with-spring-data-jpa)
+- [Spring Data JPA @Query](http://www.baeldung.com/spring-data-jpa-query)
+- [Spring JDBC](https://www.baeldung.com/spring-jdbc-jdbctemplate)
+- [Transaction Propagation and Isolation in Spring @Transactional](https://www.baeldung.com/spring-transactional-propagation-isolation)
+
+### Eclipse Config 
+After importing the project into Eclipse, you may see the following error:  
+"No persistence xml file found in project"
+
+This can be ignored: 
+- Project -> Properties -> Java Persistance -> JPA -> Error/Warnings -> Select Ignore on "No persistence xml file found in project"
+Or: 
+- Eclipse -> Preferences - Validation - disable the "Build" execution of the JPA Validator 
+

persistence-modules/spring-persistence-simple/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-persistence-simple</artifactId>
+    <version>0.1-SNAPSHOT</version>
+    <name>spring-persistence-simple</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+
+    <dependencies>
+        <!-- Spring -->
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-orm</artifactId>
+            <version>${org.springframework.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <version>${org.springframework.version}</version>
+        </dependency>
+
+        <!-- persistence -->
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-core</artifactId>
+            <version>${hibernate.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.transaction</groupId>
+            <artifactId>jta</artifactId>
+            <version>${jta.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-entitymanager</artifactId>
+            <version>${hibernate.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>${mysql-connector-java.version}</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.data</groupId>
+            <artifactId>spring-data-jpa</artifactId>
+            <version>${spring-data-jpa.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>${h2.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tomcat</groupId>
+            <artifactId>tomcat-dbcp</artifactId>
+            <version>${tomcat-dbcp.version}</version>
+        </dependency>
+
+        <!-- utils -->
+
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+        </dependency>
+
+        <!-- test scoped -->
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${org.springframework.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.querydsl</groupId>
+            <artifactId>querydsl-jpa</artifactId>
+            <version>${querydsl.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.querydsl</groupId>
+            <artifactId>querydsl-apt</artifactId>
+            <version>${querydsl.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>spring-persistence-simple</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <groupId>com.mysema.maven</groupId>
+                <artifactId>apt-maven-plugin</artifactId>
+                <version>${apt-maven-plugin.version}</version>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>process</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>target/generated-sources</outputDirectory>
+                            <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>	
+    </build>
+
+    <properties>
+        <!-- Spring -->
+        <org.springframework.version>5.1.6.RELEASE</org.springframework.version>
+
+        <!-- persistence -->
+        <hibernate.version>5.4.2.Final</hibernate.version>
+        <mysql-connector-java.version>6.0.6</mysql-connector-java.version>
+        <spring-data-jpa.version>2.1.6.RELEASE</spring-data-jpa.version>
+        <tomcat-dbcp.version>9.0.0.M26</tomcat-dbcp.version>
+        <jta.version>1.1</jta.version>
+        <querydsl.version>4.2.1</querydsl.version>
+
+        <!-- util -->
+        <guava.version>21.0</guava.version>
+        <assertj.version>3.8.0</assertj.version>
+        <apt-maven-plugin.version>1.1.3</apt-maven-plugin.version>
+    </properties>
+
+</project>

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/config/PersistenceConfig.java

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+package com.baeldung.config;
+
+import java.util.Properties;
+
+import javax.sql.DataSource;
+
+import org.apache.tomcat.dbcp.dbcp2.BasicDataSource;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.orm.hibernate5.HibernateTransactionManager;
+import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.JpaVendorAdapter;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import com.baeldung.hibernate.dao.FooDao;
+import com.baeldung.jpa.dao.IFooDao;
+import com.google.common.base.Preconditions;
+
+@Configuration
+@EnableTransactionManagement
+@EnableJpaRepositories(basePackages = { "com.baeldung.hibernate.dao" }, transactionManagerRef = "jpaTransactionManager")
+@EnableJpaAuditing
+@PropertySource({ "classpath:persistence-mysql.properties" })
+@ComponentScan({ "com.baeldung.persistence", "com.baeldung.hibernate.dao" })
+public class PersistenceConfig {
+
+    @Autowired
+    private Environment env;
+
+    public PersistenceConfig() {
+        super();
+    }
+
+    @Bean
+    public LocalSessionFactoryBean sessionFactory() {
+        final LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
+        sessionFactory.setDataSource(restDataSource());
+        sessionFactory.setPackagesToScan(new String[] { "com.baeldung.persistence.model" });
+        sessionFactory.setHibernateProperties(hibernateProperties());
+
+        return sessionFactory;
+    }
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
+        final LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
+        emf.setDataSource(restDataSource());
+        emf.setPackagesToScan(new String[] { "com.baeldung.persistence.model" });
+
+        final JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        emf.setJpaVendorAdapter(vendorAdapter);
+        emf.setJpaProperties(hibernateProperties());
+
+        return emf;
+    }
+
+    @Bean
+    public DataSource restDataSource() {
+        final BasicDataSource dataSource = new BasicDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
+    }
+
+    @Bean
+    public PlatformTransactionManager hibernateTransactionManager() {
+        final HibernateTransactionManager transactionManager = new HibernateTransactionManager();
+        transactionManager.setSessionFactory(sessionFactory().getObject());
+        return transactionManager;
+    }
+
+    @Bean
+    public PlatformTransactionManager jpaTransactionManager() {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
+        return transactionManager;
+    }
+
+    @Bean
+    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
+        return new PersistenceExceptionTranslationPostProcessor();
+    }
+
+    @Bean
+    public IFooDao fooHibernateDao() {
+        return new FooDao();
+    }
+
+    private final Properties hibernateProperties() {
+        final Properties hibernateProperties = new Properties();
+        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
+
+        hibernateProperties.setProperty("hibernate.show_sql", "true");
+        // hibernateProperties.setProperty("hibernate.format_sql", "true");
+        // hibernateProperties.setProperty("hibernate.globally_quoted_identifiers", "true");
+
+        // Envers properties
+        hibernateProperties.setProperty("org.hibernate.envers.audit_table_suffix", env.getProperty("envers.audit_table_suffix"));
+
+        return hibernateProperties;
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/config/PersistenceJPAConfig.java

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+package com.baeldung.config;
+
+import java.util.Properties;
+
+import javax.persistence.EntityManagerFactory;
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import com.google.common.base.Preconditions;
+
+@Configuration
+@EnableTransactionManagement
+@PropertySource({ "classpath:persistence-h2.properties" })
+@ComponentScan({ "com.baeldung.persistence","com.baeldung.jpa.dao" })
+@EnableJpaRepositories(basePackages = "com.baeldung.jpa.dao")
+public class PersistenceJPAConfig {
+
+    @Autowired
+    private Environment env;
+
+    public PersistenceJPAConfig() {
+        super();
+    }
+
+    // beans
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(dataSource());
+        em.setPackagesToScan(new String[] { "com.baeldung.persistence.model" });
+
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        em.setJpaVendorAdapter(vendorAdapter);
+        em.setJpaProperties(additionalProperties());
+
+        return em;
+    }
+
+    @Bean
+    public DataSource dataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
+    }
+
+    @Bean
+    public PlatformTransactionManager transactionManager(final EntityManagerFactory emf) {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(emf);
+        return transactionManager;
+    }
+
+    @Bean
+    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
+        return new PersistenceExceptionTranslationPostProcessor();
+    }
+
+    final Properties additionalProperties() {
+        final Properties hibernateProperties = new Properties();
+        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
+        hibernateProperties.setProperty("hibernate.cache.use_second_level_cache", "false");
+        
+    
+        return hibernateProperties;
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/hibernate/bootstrap/BarHibernateDAO.java

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+package com.baeldung.hibernate.bootstrap;
+
+import com.baeldung.hibernate.bootstrap.model.TestEntity;
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+
+public abstract class BarHibernateDAO {
+
+    @Autowired
+    private SessionFactory sessionFactory;
+
+    public TestEntity findEntity(int id) {
+
+        return getCurrentSession().find(TestEntity.class, 1);
+    }
+
+    public void createEntity(TestEntity entity) {
+
+        getCurrentSession().save(entity);
+    }
+
+    public void createEntity(int id, String newDescription) {
+
+        TestEntity entity = findEntity(id);
+        entity.setDescription(newDescription);
+        getCurrentSession().save(entity);
+    }
+
+    public void deleteEntity(int id) {
+
+        TestEntity entity = findEntity(id);
+        getCurrentSession().delete(entity);
+    }
+
+    protected Session getCurrentSession() {
+        return sessionFactory.getCurrentSession();
+    }
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/hibernate/bootstrap/HibernateConf.java

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+package com.baeldung.hibernate.bootstrap;
+
+import com.google.common.base.Preconditions;
+import org.apache.tomcat.dbcp.dbcp2.BasicDataSource;
+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.orm.hibernate5.HibernateTransactionManager;
+import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import javax.sql.DataSource;
+import java.util.Properties;
+
+@Configuration
+@EnableTransactionManagement
+@PropertySource({ "classpath:persistence-h2.properties" })
+public class HibernateConf {
+
+    @Autowired
+    private Environment env;
+
+    @Bean
+    public LocalSessionFactoryBean sessionFactory() {
+        final LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
+        sessionFactory.setDataSource(dataSource());
+        sessionFactory.setPackagesToScan(new String[] { "com.baeldung.hibernate.bootstrap.model" });
+        sessionFactory.setHibernateProperties(hibernateProperties());
+
+        return sessionFactory;
+    }
+
+    @Bean
+    public DataSource dataSource() {
+        final BasicDataSource dataSource = new BasicDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
+    }
+
+    @Bean
+    public PlatformTransactionManager hibernateTransactionManager() {
+        final HibernateTransactionManager transactionManager = new HibernateTransactionManager();
+        transactionManager.setSessionFactory(sessionFactory().getObject());
+        return transactionManager;
+    }
+
+    private final Properties hibernateProperties() {
+        final Properties hibernateProperties = new Properties();
+        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
+
+        return hibernateProperties;
+    }
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/hibernate/bootstrap/HibernateXMLConf.java

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+package com.baeldung.hibernate.bootstrap;
+
+import com.google.common.base.Preconditions;
+import org.apache.tomcat.dbcp.dbcp2.BasicDataSource;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportResource;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.orm.hibernate5.HibernateTransactionManager;
+import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import javax.sql.DataSource;
+import java.util.Properties;
+
+@Configuration
+@EnableTransactionManagement
+@ImportResource({ "classpath:hibernate5Configuration.xml" })
+public class HibernateXMLConf {
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/hibernate/bootstrap/model/TestEntity.java

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+package com.baeldung.hibernate.bootstrap.model;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Entity
+public class TestEntity {
+
+    private int id;
+
+    private String description;
+
+    @Id
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/hibernate/dao/FooDao.java

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+package com.baeldung.hibernate.dao;
+
+import com.baeldung.persistence.model.Foo;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.jpa.dao.IFooDao;
+import com.baeldung.persistence.dao.common.AbstractHibernateDao;
+
+@Repository
+public class FooDao extends AbstractHibernateDao<Foo> implements IFooDao {
+
+    public FooDao() {
+        super();
+
+        setClazz(Foo.class);
+    }
+
+    // API
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jdbc/CustomSQLErrorCodeTranslator.java

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+package com.baeldung.jdbc;
+
+import java.sql.SQLException;
+
+import org.springframework.dao.DataAccessException;
+import org.springframework.dao.DuplicateKeyException;
+import org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator;
+
+public class CustomSQLErrorCodeTranslator extends SQLErrorCodeSQLExceptionTranslator {
+
+    @Override
+    protected DataAccessException customTranslate(final String task, final String sql, final SQLException sqlException) {
+        if (sqlException.getErrorCode() == 23505) {
+            return new DuplicateKeyException("Custome Exception translator - Integrity contraint voilation.", sqlException);
+        }
+        return null;
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jdbc/Employee.java

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+package com.baeldung.jdbc;
+
+public class Employee {
+    private int id;
+
+    private String firstName;
+
+    private String lastName;
+
+    private String address;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(final String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(final String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(final String address) {
+        this.address = address;
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jdbc/EmployeeDAO.java

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+package com.baeldung.jdbc;
+
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.BatchPreparedStatementSetter;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
+import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
+import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
+import org.springframework.jdbc.core.namedparam.SqlParameterSource;
+import org.springframework.jdbc.core.namedparam.SqlParameterSourceUtils;
+import org.springframework.jdbc.core.simple.SimpleJdbcCall;
+import org.springframework.jdbc.core.simple.SimpleJdbcInsert;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class EmployeeDAO {
+
+    private JdbcTemplate jdbcTemplate;
+
+    private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
+
+    private SimpleJdbcInsert simpleJdbcInsert;
+    
+    private SimpleJdbcCall simpleJdbcCall;
+
+    @Autowired
+    public void setDataSource(final DataSource dataSource) {
+        jdbcTemplate = new JdbcTemplate(dataSource);
+        final CustomSQLErrorCodeTranslator customSQLErrorCodeTranslator = new CustomSQLErrorCodeTranslator();
+        jdbcTemplate.setExceptionTranslator(customSQLErrorCodeTranslator);
+
+        namedParameterJdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
+        simpleJdbcInsert = new SimpleJdbcInsert(dataSource).withTableName("EMPLOYEE");
+        
+        // Commented as the database is H2, change the database and create procedure READ_EMPLOYEE before calling getEmployeeUsingSimpleJdbcCall 
+        //simpleJdbcCall = new SimpleJdbcCall(dataSource).withProcedureName("READ_EMPLOYEE");
+    }
+
+    public int getCountOfEmployees() {
+        return jdbcTemplate.queryForObject("SELECT COUNT(*) FROM EMPLOYEE", Integer.class);
+    }
+
+    public List<Employee> getAllEmployees() {
+        return jdbcTemplate.query("SELECT * FROM EMPLOYEE", new EmployeeRowMapper());
+    }
+
+    public int addEmplyee(final int id) {
+        return jdbcTemplate.update("INSERT INTO EMPLOYEE VALUES (?, ?, ?, ?)", id, "Bill", "Gates", "USA");
+    }
+
+    public int addEmplyeeUsingSimpelJdbcInsert(final Employee emp) {
+        final Map<String, Object> parameters = new HashMap<String, Object>();
+        parameters.put("ID", emp.getId());
+        parameters.put("FIRST_NAME", emp.getFirstName());
+        parameters.put("LAST_NAME", emp.getLastName());
+        parameters.put("ADDRESS", emp.getAddress());
+
+        return simpleJdbcInsert.execute(parameters);
+    }
+
+    public Employee getEmployee(final int id) {
+        final String query = "SELECT * FROM EMPLOYEE WHERE ID = ?";
+        return jdbcTemplate.queryForObject(query, new Object[] { id }, new EmployeeRowMapper());
+    }
+
+    public void addEmplyeeUsingExecuteMethod() {
+        jdbcTemplate.execute("INSERT INTO EMPLOYEE VALUES (6, 'Bill', 'Gates', 'USA')");
+    }
+
+    public String getEmployeeUsingMapSqlParameterSource() {
+        final SqlParameterSource namedParameters = new MapSqlParameterSource().addValue("id", 1);
+
+        return namedParameterJdbcTemplate.queryForObject("SELECT FIRST_NAME FROM EMPLOYEE WHERE ID = :id", namedParameters, String.class);
+    }
+
+    public int getEmployeeUsingBeanPropertySqlParameterSource() {
+        final Employee employee = new Employee();
+        employee.setFirstName("James");
+
+        final String SELECT_BY_ID = "SELECT COUNT(*) FROM EMPLOYEE WHERE FIRST_NAME = :firstName";
+
+        final SqlParameterSource namedParameters = new BeanPropertySqlParameterSource(employee);
+
+        return namedParameterJdbcTemplate.queryForObject(SELECT_BY_ID, namedParameters, Integer.class);
+    }
+
+    public int[] batchUpdateUsingJDBCTemplate(final List<Employee> employees) {
+        return jdbcTemplate.batchUpdate("INSERT INTO EMPLOYEE VALUES (?, ?, ?, ?)", new BatchPreparedStatementSetter() {
+
+            @Override
+            public void setValues(final PreparedStatement ps, final int i) throws SQLException {
+                ps.setInt(1, employees.get(i).getId());
+                ps.setString(2, employees.get(i).getFirstName());
+                ps.setString(3, employees.get(i).getLastName());
+                ps.setString(4, employees.get(i).getAddress());
+            }
+
+            @Override
+            public int getBatchSize() {
+                return 3;
+            }
+        });
+    }
+
+    public int[] batchUpdateUsingNamedParameterJDBCTemplate(final List<Employee> employees) {
+        final SqlParameterSource[] batch = SqlParameterSourceUtils.createBatch(employees.toArray());
+        final int[] updateCounts = namedParameterJdbcTemplate.batchUpdate("INSERT INTO EMPLOYEE VALUES (:id, :firstName, :lastName, :address)", batch);
+        return updateCounts;
+    }
+    
+    public Employee getEmployeeUsingSimpleJdbcCall(int id) {
+        SqlParameterSource in = new MapSqlParameterSource().addValue("in_id", id);
+        Map<String, Object> out = simpleJdbcCall.execute(in);
+
+        Employee emp = new Employee();
+        emp.setFirstName((String) out.get("FIRST_NAME"));
+        emp.setLastName((String) out.get("LAST_NAME"));
+
+        return emp;
+    }
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jdbc/EmployeeRowMapper.java

@@ -0,0 +1,21 @@
+package com.baeldung.jdbc;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import org.springframework.jdbc.core.RowMapper;
+
+public class EmployeeRowMapper implements RowMapper<Employee> {
+
+    @Override
+    public Employee mapRow(final ResultSet rs, final int rowNum) throws SQLException {
+        final Employee employee = new Employee();
+
+        employee.setId(rs.getInt("ID"));
+        employee.setFirstName(rs.getString("FIRST_NAME"));
+        employee.setLastName(rs.getString("LAST_NAME"));
+        employee.setAddress(rs.getString("ADDRESS"));
+
+        return employee;
+    }
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jdbc/config/SpringJdbcConfig.java

@@ -0,0 +1,32 @@
+package com.baeldung.jdbc.config;
+
+import javax.sql.DataSource;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+
+@Configuration
+@ComponentScan("com.baeldung.jdbc")
+public class SpringJdbcConfig {
+
+    @Bean
+    public DataSource dataSource() {
+        return new EmbeddedDatabaseBuilder().setType(EmbeddedDatabaseType.H2).addScript("classpath:jdbc/schema.sql").addScript("classpath:jdbc/test-data.sql").build();
+    }
+
+    // @Bean
+    public DataSource mysqlDataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
+        dataSource.setUrl("jdbc:mysql://localhost:3306/springjdbc");
+        dataSource.setUsername("guest_user");
+        dataSource.setPassword("guest_password");
+
+        return dataSource;
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jpa/dao/AbstractJpaDAO.java

@@ -0,0 +1,47 @@
+package com.baeldung.jpa.dao;
+
+import java.io.Serializable;
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+
+public abstract class AbstractJpaDAO<T extends Serializable> {
+
+    private Class<T> clazz;
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    public final void setClazz(final Class<T> clazzToSet) {
+        this.clazz = clazzToSet;
+    }
+
+    public T findOne(final long id) {
+        return entityManager.find(clazz, id);
+    }
+
+    @SuppressWarnings("unchecked")
+    public List<T> findAll() {
+        return entityManager.createQuery("from " + clazz.getName()).getResultList();
+    }
+
+    public T create(final T entity) {
+        entityManager.persist(entity);
+        return entity;
+    }
+
+    public T update(final T entity) {
+        return entityManager.merge(entity);
+    }
+
+    public void delete(final T entity) {
+        entityManager.remove(entity);
+    }
+
+    public void deleteById(final long entityId) {
+        final T entity = findOne(entityId);
+        delete(entity);
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jpa/dao/FooDao.java

@@ -0,0 +1,17 @@
+package com.baeldung.jpa.dao;
+
+import com.baeldung.persistence.model.Foo;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class FooDao extends AbstractJpaDAO<Foo> implements IFooDao {
+
+    public FooDao() {
+        super();
+
+        setClazz(Foo.class);
+    }
+
+    // API
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/jpa/dao/IFooDao.java

@@ -0,0 +1,21 @@
+package com.baeldung.jpa.dao;
+
+import java.util.List;
+
+import com.baeldung.persistence.model.Foo;
+
+public interface IFooDao {
+
+    Foo findOne(long id);
+
+    List<Foo> findAll();
+
+    Foo create(Foo entity);
+
+    Foo update(Foo entity);
+
+    void delete(Foo entity);
+
+    void deleteById(long entityId);
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/dao/common/AbstractDao.java

@@ -0,0 +1,14 @@
+package com.baeldung.persistence.dao.common;
+
+import java.io.Serializable;
+
+import com.google.common.base.Preconditions;
+
+public abstract class AbstractDao<T extends Serializable> implements IOperations<T> {
+
+    protected Class<T> clazz;
+
+    protected final void setClazz(final Class<T> clazzToSet) {
+        clazz = Preconditions.checkNotNull(clazzToSet);
+    }
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/dao/common/AbstractHibernateDao.java

@@ -0,0 +1,60 @@
+package com.baeldung.persistence.dao.common;
+
+import java.io.Serializable;
+import java.util.List;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import com.google.common.base.Preconditions;
+
+@SuppressWarnings("unchecked")
+public abstract class AbstractHibernateDao<T extends Serializable> extends AbstractDao<T> implements IOperations<T> {
+
+    @Autowired
+    protected SessionFactory sessionFactory;
+
+    // API
+
+    @Override
+    public T findOne(final long id) {
+        return (T) getCurrentSession().get(clazz, id);
+    }
+
+    @Override
+    public List<T> findAll() {
+        return getCurrentSession().createQuery("from " + clazz.getName()).list();
+    }
+
+    @Override
+    public T create(final T entity) {
+        Preconditions.checkNotNull(entity);
+        getCurrentSession().saveOrUpdate(entity);
+        return entity;
+    }
+
+    @Override
+    public T update(final T entity) {
+        Preconditions.checkNotNull(entity);
+        return (T) getCurrentSession().merge(entity);
+    }
+
+    @Override
+    public void delete(final T entity) {
+        Preconditions.checkNotNull(entity);
+        getCurrentSession().delete(entity);
+    }
+
+    @Override
+    public void deleteById(final long entityId) {
+        final T entity = findOne(entityId);
+        Preconditions.checkState(entity != null);
+        delete(entity);
+    }
+
+    protected Session getCurrentSession() {
+        return sessionFactory.getCurrentSession();
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/dao/common/GenericHibernateDao.java

@@ -0,0 +1,13 @@
+package com.baeldung.persistence.dao.common;
+
+import java.io.Serializable;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.context.annotation.Scope;
+import org.springframework.stereotype.Repository;
+
+@Repository
+@Scope(BeanDefinition.SCOPE_PROTOTYPE)
+public class GenericHibernateDao<T extends Serializable> extends AbstractHibernateDao<T> implements IGenericDao<T> {
+    //
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/dao/common/GenericJpaDao.java

@@ -0,0 +1,15 @@
+package com.baeldung.persistence.dao.common;
+
+import java.io.Serializable;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.context.annotation.Scope;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.jpa.dao.AbstractJpaDAO;
+
+@Repository
+@Scope(BeanDefinition.SCOPE_PROTOTYPE)
+public class GenericJpaDao<T extends Serializable> extends AbstractJpaDAO<T> implements IGenericDao<T> {
+    //
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/dao/common/IGenericDao.java

@@ -0,0 +1,7 @@
+package com.baeldung.persistence.dao.common;
+
+import java.io.Serializable;
+
+public interface IGenericDao<T extends Serializable> extends IOperations<T> {
+    //
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/dao/common/IOperations.java

@@ -0,0 +1,20 @@
+package com.baeldung.persistence.dao.common;
+
+import java.io.Serializable;
+import java.util.List;
+
+public interface IOperations<T extends Serializable> {
+
+    T findOne(final long id);
+
+    List<T> findAll();
+
+    T create(final T entity);
+
+    T update(final T entity);
+
+    void delete(final T entity);
+
+    void deleteById(final long entityId);
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/model/Bar.java

@@ -0,0 +1,102 @@
+package com.baeldung.persistence.model;
+
+import java.io.Serializable;
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.OneToMany;
+import javax.persistence.OrderBy;
+
+@Entity
+public class Bar implements Serializable {
+    private static final long serialVersionUID = 1L;
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+
+    @Column(nullable = false)
+    private String name;
+
+    @OneToMany(mappedBy = "bar", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
+    @OrderBy("name ASC")
+    List<Foo> fooList;
+
+    public Bar() {
+        super();
+    }
+
+    public Bar(final String name) {
+        super();
+
+        this.name = name;
+    }
+
+    // API
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(final long id) {
+
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    public List<Foo> getFooList() {
+        return fooList;
+    }
+
+    public void setFooList(final List<Foo> fooList) {
+        this.fooList = fooList;
+    }
+
+    //
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final Bar other = (Bar) obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Bar [name=").append(name).append("]");
+        return builder.toString();
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/model/Foo.java

@@ -0,0 +1,104 @@
+package com.baeldung.persistence.model;
+
+import java.io.Serializable;
+
+import javax.persistence.Cacheable;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import javax.persistence.NamedNativeQueries;
+import javax.persistence.NamedNativeQuery;
+
+import org.hibernate.annotations.CacheConcurrencyStrategy;
+
+@Entity
+@Cacheable
+@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
+@NamedNativeQueries({ @NamedNativeQuery(name = "callGetAllFoos", query = "CALL GetAllFoos()", resultClass = Foo.class), @NamedNativeQuery(name = "callGetFoosByName", query = "CALL GetFoosByName(:fooName)", resultClass = Foo.class) })
+public class Foo implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    public Foo() {
+        super();
+    }
+
+    public Foo(final String name) {
+        super();
+
+        this.name = name;
+    }
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "ID")
+    private Long id;
+    @Column(name = "NAME")
+    private String name;
+
+    @ManyToOne(targetEntity = Bar.class, fetch = FetchType.EAGER)
+    @JoinColumn(name = "BAR_ID")
+    private Bar bar;
+
+    public Bar getBar() {
+        return bar;
+    }
+
+    public void setBar(final Bar bar) {
+        this.bar = bar;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(final Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final Foo other = (Foo) obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Foo [name=").append(name).append("]");
+        return builder.toString();
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/persistence/service/FooService.java

@@ -0,0 +1,36 @@
+package com.baeldung.persistence.service;
+
+import java.util.List;
+
+import com.baeldung.jpa.dao.IFooDao;
+import com.baeldung.persistence.model.Foo;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional
+public class FooService {
+
+    @Autowired
+    private IFooDao dao;
+
+    public FooService() {
+        super();
+    }
+
+    // API
+
+    public void create(final Foo entity) {
+        dao.create(entity);
+    }
+
+    public Foo findOne(final long id) {
+        return dao.findOne(id);
+    }
+
+    public List<Foo> findAll() {
+        return dao.findAll();
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/spring/data/persistence/config/PersistenceConfig.java

@@ -0,0 +1,85 @@
+package com.baeldung.spring.data.persistence.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.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import com.google.common.base.Preconditions;
+
+@Configuration
+@EnableTransactionManagement
+@PropertySource({ "classpath:persistence-${envTarget:h2}.properties" })
+@ComponentScan({ "com.baeldung.spring.data.persistence" })
+// @ImportResource("classpath*:springDataPersistenceConfig.xml")
+@EnableJpaRepositories(basePackages = { "com.baeldung.spring.data.persistence.dao", "com.baeldung.spring.data.persistence.jpaquery" })
+public class PersistenceConfig {
+
+    @Autowired
+    private Environment env;
+
+    public PersistenceConfig() {
+        super();
+    }
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(dataSource());
+        em.setPackagesToScan(new String[] { "com.baeldung.spring.data.persistence.model" });
+
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        // vendorAdapter.set
+        em.setJpaVendorAdapter(vendorAdapter);
+        em.setJpaProperties(additionalProperties());
+
+        return em;
+    }
+
+    @Bean
+    public DataSource dataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
+    }
+
+    @Bean
+    public PlatformTransactionManager transactionManager() {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
+
+        return transactionManager;
+    }
+
+    @Bean
+    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
+        return new PersistenceExceptionTranslationPostProcessor();
+    }
+
+    final Properties additionalProperties() {
+        final Properties hibernateProperties = new Properties();
+        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
+        // hibernateProperties.setProperty("hibernate.globally_quoted_identifiers", "true");
+        return hibernateProperties;
+    }
+
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/spring/data/persistence/dao/IFooDao.java

@@ -0,0 +1,11 @@
+package com.baeldung.spring.data.persistence.dao;
+
+import com.baeldung.spring.data.persistence.model.Foo;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+public interface IFooDao extends JpaRepository<Foo, Long> {
+
+    @Query("SELECT f FROM Foo f WHERE LOWER(f.name) = LOWER(:name)")
+    Foo retrieveByName(@Param("name") String name);
+}

persistence-modules/spring-persistence-simple/src/main/java/com/baeldung/spring/data/persistence/jpaquery/UserRepository.java

@@ -0,0 +1,98 @@
+package com.baeldung.spring.data.persistence.jpaquery;
+
+import java.time.LocalDate;
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Stream;
+
+import com.baeldung.spring.data.persistence.model.User;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+public interface UserRepository extends JpaRepository<User, Integer>, UserRepositoryCustom {
+
+    Stream<User> findAllByName(String name);
+
+    @Query("SELECT u FROM User u WHERE u.status = 1")
+    Collection<User> findAllActiveUsers();
+    
+    @Query("select u from User u where u.email like '%@gmail.com'")
+    List<User> findUsersWithGmailAddress();
+
+    @Query(value = "SELECT * FROM Users u WHERE u.status = 1", nativeQuery = true)
+    Collection<User> findAllActiveUsersNative();
+
+    @Query("SELECT u FROM User u WHERE u.status = ?1")
+    User findUserByStatus(Integer status);
+
+    @Query(value = "SELECT * FROM Users u WHERE u.status = ?1", nativeQuery = true)
+    User findUserByStatusNative(Integer status);
+
+    @Query("SELECT u FROM User u WHERE u.status = ?1 and u.name = ?2")
+    User findUserByStatusAndName(Integer status, String name);
+
+    @Query("SELECT u FROM User u WHERE u.status = :status and u.name = :name")
+    User findUserByStatusAndNameNamedParams(@Param("status") Integer status, @Param("name") String name);
+
+    @Query(value = "SELECT * FROM Users u WHERE u.status = :status AND u.name = :name", nativeQuery = true)
+    User findUserByStatusAndNameNamedParamsNative(@Param("status") Integer status, @Param("name") String name);
+
+    @Query("SELECT u FROM User u WHERE u.status = :status and u.name = :name")
+    User findUserByUserStatusAndUserName(@Param("status") Integer userStatus, @Param("name") String userName);
+
+    @Query("SELECT u FROM User u WHERE u.name like ?1%")
+    User findUserByNameLike(String name);
+
+    @Query("SELECT u FROM User u WHERE u.name like :name%")
+    User findUserByNameLikeNamedParam(@Param("name") String name);
+
+    @Query(value = "SELECT * FROM users u WHERE u.name LIKE ?1%", nativeQuery = true)
+    User findUserByNameLikeNative(String name);
+
+    @Query(value = "SELECT u FROM User u")
+    List<User> findAllUsers(Sort sort);
+
+    @Query(value = "SELECT u FROM User u ORDER BY id")
+    Page<User> findAllUsersWithPagination(Pageable pageable);
+
+    @Query(value = "SELECT * FROM Users ORDER BY id", countQuery = "SELECT count(*) FROM Users", nativeQuery = true)
+    Page<User> findAllUsersWithPaginationNative(Pageable pageable);
+
+    @Modifying
+    @Query("update User u set u.status = :status where u.name = :name")
+    int updateUserSetStatusForName(@Param("status") Integer status, @Param("name") String name);
+
+    @Modifying
+    @Query(value = "UPDATE Users u SET u.status = ? WHERE u.name = ?", nativeQuery = true)
+    int updateUserSetStatusForNameNative(Integer status, String name);
+
+    @Query(value = "INSERT INTO Users (name, age, email, status, active) VALUES (:name, :age, :email, :status, :active)", nativeQuery = true)
+    @Modifying
+    void insertUser(@Param("name") String name, @Param("age") Integer age, @Param("email") String email, @Param("status") Integer status, @Param("active") boolean active);
+    
+    @Modifying
+    @Query(value = "UPDATE Users u SET status = ? WHERE u.name = ?", nativeQuery = true)
+    int updateUserSetStatusForNameNativePostgres(Integer status, String name);
+    
+    @Query(value = "SELECT u FROM User u WHERE u.name IN :names")
+	  List<User> findUserByNameList(@Param("names") Collection<String> names);
+    
+    void deleteAllByCreationDateAfter(LocalDate date);
+
+    @Modifying(clearAutomatically = true, flushAutomatically = true)
+    @Query("update User u set u.active = false where u.lastLoginDate < :date")
+    void deactivateUsersNotLoggedInSince(@Param("date") LocalDate date);
+
+    @Modifying(clearAutomatically = true, flushAutomatically = true)
+    @Query("delete User u where u.active = false")
+    int deleteDeactivatedUsers();
+
+    @Modifying(clearAutomatically = true, flushAutomatically = true)
+    @Query(value = "alter table USERS add column deleted int(1) not null default 0", nativeQuery = true)
+    void addDeletedColumn();
+}