public class Employees {
  private Integer employeeId;
  private String firstName;
  private String lastName;
  private String email;
  private String phoneNumber;
  private Date hireDate;
  private String jobId;
  private BigDecimal salary;
  private BigDecimal commissionPct;
  private Integer managerId;
  private Short departmentId;
} 

  <!--List:forech中的collection屬性類型是List,collection的值必須是:list,item的值可以隨意,Dao接口中參數(shù)名字隨意 -->
  <select id="getEmployeesListParams" resultType="Employees">
    select *
    from EMPLOYEES e
    where e.EMPLOYEE_ID in
    <foreach collection="list" item="employeeId" index="index"
      open="(" close=")" separator=",">
      #{employeeId}
    </foreach>
  </select>
  <!--Array:forech中的collection屬性類型是array,collection的值必須是:list,item的值可以隨意,Dao接口中參數(shù)名字隨意 -->
  <select id="getEmployeesArrayParams" resultType="Employees">
    select *
    from EMPLOYEES e
    where e.EMPLOYEE_ID in
    <foreach collection="array" item="employeeId" index="index"
      open="(" close=")" separator=",">
      #{employeeId}
    </foreach>
  </select>

  <!--Map:不單單forech中的collection屬性是map.key,其它所有屬性都是map.key,比如下面的departmentId -->
  <select id="getEmployeesMapParams" resultType="Employees">
    select *
    from EMPLOYEES e
    <where>
      <if test="departmentId!=null and departmentId!=''">
        e.DEPARTMENT_ID=#{departmentId}
      </if>
      <if test="employeeIdsArray!=null and employeeIdsArray.length!=0">
        AND e.EMPLOYEE_ID in
        <foreach collection="employeeIdsArray" item="employeeId"
          index="index" open="(" close=")" separator=",">
          #{employeeId}
        </foreach>
      </if>
    </where>
  </select>

public interface EmployeesMapper { 
  List<Employees> getEmployeesListParams(List<String> employeeIds);
  List<Employees> getEmployeesArrayParams(String[] employeeIds);
  List<Employees> getEmployeesMapParams(Map<String,Object> params);
}