package com.wbg.Jpa.entity;import com.sun.javafx.geom.transform.Identity;import javax.persistence.*;@Entity
@Table
public class Role {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private int id;//比如数据库名字是names  指定设置为：@Column(name = "role_name")private String roleName;private String note;@Overridepublic String toString() {return "Role{" +"id=" + id +", roleName='" + roleName + '\'' +", note='" + note + '\'' +'}';}public Role() {}public Role(int id, String roleName, String note) {this.id = id;this.roleName = roleName;this.note = note;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getRoleName() {return roleName;}public void setRoleName(String roleName) {this.roleName = roleName;}public String getNote() {return note;}public void setNote(String note) {this.note = note;}
}

package com.wbg.Jpa.config;import com.mchange.v2.c3p0.ComboPooledDataSource;
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.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
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 org.springframework.transaction.annotation.TransactionManagementConfigurer;
import org.springframework.transaction.support.TransactionTemplate;import javax.sql.DataSource;
import java.beans.PropertyVetoException;
import java.util.Properties;@Configuration
@ComponentScan("com.wbg.Jpa")
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = {"com.wbg.Jpa.dao"})
public class JavaConfig  {@Bean(name = "dataSource")public DataSource getDataSource() {ComboPooledDataSource dataSource = new ComboPooledDataSource();try {dataSource.setDriverClass("org.mariadb.jdbc.Driver");} catch (PropertyVetoException e) {e.printStackTrace();}dataSource.setJdbcUrl("jdbc:mariadb://localhost:3306/wbg_logistics");dataSource.setUser("root");dataSource.setPassword("123456");dataSource.setMaxPoolSize(30);return dataSource;}@Beanpublic JdbcTemplate jdbcTemplate() {JdbcTemplate jdbcTemplate = new JdbcTemplate();jdbcTemplate.setDataSource(getDataSource());return jdbcTemplate;}@Beanpublic PlatformTransactionManager transactionManager(DataSource dataSource) {return new DataSourceTransactionManager(dataSource);}@BeanLocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource){LocalContainerEntityManagerFactoryBean bean = new LocalContainerEntityManagerFactoryBean();bean.setDataSource(dataSource);bean.setPackagesToScan("com.wbg.Jpa.entity");bean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());Properties properties = new Properties();/*** validate 加载hibernate时，验证创建数据库表结构 * create 每次加载hibernate，重新创建数据库表结构，这就是导致数据库表数据丢失的原因。。* create-drop        加载hibernate时创建，退出是删除表结构 * update             加载hibernate自动更新数据库结构*/properties.setProperty("hibernate.hbm2ddl.auto","update");//格式化输出语句/**列如* Hibernate: select role0_.id as id1_0_, role0_.note as note2_0_, role0_.role_name as role_nam3_0_ from Role role0_*格式化韦* select*         role0_.id as id1_0_,*         role0_.note as note2_0_,*         role0_.role_name as role_nam3_0_*     from*         Role role0_*/properties.setProperty("hibernate.format_sql","true");//显示执行sql语句properties.setProperty("hibernate.show_sql","true");//设置方言            properties.setProperty("hibernate.dialect","org.hibernate.dialect.MySQLDialect");
        bean.setJpaProperties(properties);return bean;}}

package com.wbg.Jpa.dao;import com.wbg.Jpa.entity.Role;
import org.springframework.data.jpa.repository.JpaRepository;public interface RoleDao  extends JpaRepository<Role,Integer> {}

package com.wbg.Jpa.dao;import com.wbg.Jpa.entity.Role;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;@Service
public class RoleService {@Autowiredprivate RoleDao roleDao;public List<Role> listAll() {List<Role> list = roleDao.findAll();return list;}}