package db.springdata;

import db.h2.H2DbHelper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
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.JpaVendorAdapter;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.Database;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;

@Configuration
@ComponentScan("db.springdata")
@EnableJpaRepositories(basePackages = "db.springdata")
@EnableTransactionManagement
public class AppConfig4H2 {
	@Bean
	public DataSource dataSource() {
		DriverManagerDataSource ds = new DriverManagerDataSource();
		ds.setDriverClassName(H2DbHelper.H2_DRIVER);
		ds.setUrl(H2DbHelper.JDBC_URL);
		ds.setUsername("sa");
		ds.setPassword("");
		return ds;
	}
	
	@Bean
	public JpaVendorAdapter jpaVendorAdapter() {
		HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
		adapter.setDatabase(Database.H2);
		adapter.setGenerateDdl(false);
		adapter.setShowSql(false);
		adapter.setDatabasePlatform("org.hibernate.dialect.H2Dialect");
		return adapter;
	}

	@Bean
	public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource,
			JpaVendorAdapter jpaVendorAdapter) {
		LocalContainerEntityManagerFactoryBean emfb = new LocalContainerEntityManagerFactoryBean();

		emfb.setDataSource(dataSource);
		emfb.setJpaVendorAdapter(jpaVendorAdapter);

		// 扫描db.model包,查找带有@Entity注解的类
		emfb.setPackagesToScan("db.model");
		return emfb;
	}

	@Bean
	public JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
		JpaTransactionManager txManager = new JpaTransactionManager();
		txManager.setEntityManagerFactory(entityManagerFactory);
		return txManager;
	}

}