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属性类型是List,collection的值必须是:list,item的值可以随意,Dao接口中参数名字随意 -->
<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属性类型是array,collection的值必须是:list,item的值可以随意,Dao接口中参数名字随意 -->
<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:不单单forech中的collection属性是map.key,其它所有属性都是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);
}
测试方法(未贴完整代码):
@Test
public void testGetEmployeesListParams() {
List<String> employeeIds = Arrays.asList("100", "101", "200");
List<Employees> result = employeesMapper
.getEmployeesListParams(employeeIds);
assertEquals(3, result.size());
}
@Test
public void testGetEmployeesArrayParams() {
String[] employeeIds = new String[] { "100", "200" };
List<Employees> result = employeesMapper
.getEmployeesArrayParams(employeeIds);
assertEquals(2, result.size());
}
@Test
public void testGetEmployeesMapParams() {
String departmentId = "60";
List<String> employeeIdsList = Arrays.asList("103", "104", "105");
String[] employeeIdsArray = new String[] { "103", "104" };
// 传入多个参数
Map<String, Object> params = new HashMap<String, Object>();
params.put("departmentId", departmentId);
params.put("employeeIdsList", employeeIdsList);
params.put("employeeIdsArray", employeeIdsArray);
List<Employees> result = employeesMapper.getEmployeesMapParams(params);
assertEquals(3, result.size());
}
原文：http://www.cnblogs.com/tv151579/p/5742453.html