MiniDao持久化解决方案-轻识

MiniDao是Jeecg自己的持久化解决方案，具备了Hibernate实体维护和Mybaits SQL分离的两大优势。具有以下特征:

1.O/R mapping不用设置xml，零配置便于维护
2.不需要了解JDBC的知识
3.SQL语句和java代码的分离
4.可以自动生成SQL语句
5.接口和实现分离，不用写持久层代码，用户只需写接口，以及某些接口方法对应的sql 它会通过AOP自动生成实现类
6.支持自动事务处理和手动事务处理
7.支持与hibernate轻量级无缝集成
8.MiniDao整合了Hibernate+mybatis的两大优势，支持实体维护和SQL分离
9.SQL支持脚本语言

※向下兼容Hibernate实体维护方式,实体的增删改查SQL自动生成

接口和SQL文件对应目录

接口定义[EmployeeDao.java]

@MiniDao
public interface EmployeeDao {
 @Arguments("employee")
 public ListgetAllEmployees(Employee employee);

 @Arguments("empno")
 Employee getEmployee(String empno);

 @Arguments({"empno","name"})
 Map getMap(String empno,String name);

 @Sql("SELECT count(*) FROM employee")
 Integer getCount();

 @Arguments("employee")
 int update(Employee employee);

 @Arguments("employee")
 void insert(Employee employee);

}

SQL文件[EmployeeDao_getAllEmployees.sql]

SELECT * FROM employee where 1=1 
<#if employee.age ?exists>
and age = :employee.age

 
<#if employee.name ?exists>
and name = :employee.name

 
<#if employee.empno ?exists>
and empno = :employee.empno

MiniDao接口配置

<!-- 注册MiniDao接口 -->
<bean class="org.jeecgframework.minidao.factory.MiniDaoBeanFactory">
    <property name="packagesToScan">
        <list>
            <value>examples.dao.*</value>
        </list>
    </property>
</bean>

测试代码

public class Client {
public static void main(String args[]) {
    BeanFactory factory = new ClassPathXmlApplicationContext(
            "applicationContext.xml");

    EmployeeDao employeeDao = (EmployeeDao) factory.getBean("employeeDao");
    Employee employee = new Employee();
    Listlist =  employeeDao.getAllEmployees(employee);
    for(Map mp:list){
        System.out.println(mp.get("id"));
        System.out.println(mp.get("name"));
        System.out.println(mp.get("empno"));
        System.out.println(mp.get("age"));
        System.out.println(mp.get("birthday"));
        System.out.println(mp.get("salary"));
    }
}
}