mybatis学习五 多参数查询(一)

1. 编写接口多参数方法

/**
* 多参数查询，注意要和Employeer.xml的方法名对应
*/
public List<Employeer> findEmployeerByNameandDep(String employeer_name,String employeer_department);

2. 编写resultMap

<!-- 定义数据库字段与实体对象的映射关系 -->
<resultMap type="Employeer" id="resultMap">
<id property="employeer_id" column="employeer_id"/>
<result property="employeer_name" column="employeer_name"/>
<result property="employeer_age" column="employeer_age"/>
<result property="employeer_department" column="employeer_department"/>
<result property="employeer_worktype" column="employeer_worktype"/>
</resultMap>

3. 编写sql语句

<!--多参数 查找 返回list 的select 语句，注意 resultMap 的值是指向前面定义好的 -->
<select id="findEmployeerByNameandDep"  resultMap="resultMap">
select* from `t_employeer` where employeer_name=#{0} and employeer_department=#{1}
</select>

4. 编写查询方法

/**
* 多参数查询列表
*/
public static List<Employeer> getEmployeerList(String employeer_name,String employeer_department){
SqlSession session = null;
List<Employeer> employeers=null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
employeers = employeerMapper.findEmployeerByNameandDep(employeer_name, employeer_department);
session.commit() ;
} finally {
session.close();
}
return employeers;

}

5. 编写测试类

public static void main(String[] args) {
System.out.println("=========================使用多单参数查询===========================");
List<Employeer> employeers1=getEmployeerList("张三","产品二部");
for(Employeer employeer1:employeers1){
System.out.println(employeer1);
}