线程"main“中出现异常: javax.persistence.PersistenceException:无法执行语句

// 示例：persistence.xml中的数据库连接配置
<persistence-unit name="myPersistenceUnit">
    <jta-data-source>java:jboss/datasources/MyDS</jta-data-source>
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
        <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
        <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/mydatabase"/>
        <property name="hibernate.connection.username" value="dbuser"/>
        <property name="hibernate.connection.password" value="dbpass"/>
    </properties>
</persistence-unit>

// 示例：实体类
@Entity
@Table(name = "employees")
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "first_name")
    private String firstName;

    // 其他字段和方法...
}

@Transactional
public void saveEmployee(Employee employee) {
    entityManager.persist(employee);
}