MyBatis传入参数的实例代码
在MyBatis的select、insert、update、delete这些元素中都提到了parameterType这个属性。MyBatis现在可以使用的parameterType有基本数据类型和JAVA复杂数据类型
基本数据类型:包含int,String,Date等。基本数据类型作为传参,只能传入一个。通过#{参数名} 即可获取传入的值
复杂数据类型:包含JAVA实体类、Map。通过#{属性名}或#{map的KeyName}即可获取传入的值
基本数据类型参数示例:
根据班级ID查询教师列表
xml文件
<select id="selectTeacher" parameterType="int" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} </select>
java代码
List<Teacher> tList = teacherMapper.selectTeacher(2); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); }
JAVA实体类型参数示例:
<select id="selectTeacher" parameterType="com.myapp.domain.Teacher" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} </select>
java代码
Teacher queryTeacher=new Teacher(); queryTeacher.setId(2); List<Teacher> tList = teacherMapper.selectTeacher(queryTeacher); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); }
Map参数示例:
<select id="selectTeacher" parameterType="Map" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} and sex=#{sex} </select>
java代码
Map<String,String> map=new HasMap<String,String>(); map.put("id","2"); map.put("sex","男"); List<Teacher> tList = teacherMapper.selectTeacher(map); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); }
另外MyBatis还提供了一个使用注解来参入多个参数的方式。这种方式需要在接口的参数上添加@Param注解
示例:
接口方法
public List<Teacher> selectTeacher(@Param(value="id") String id,@Param(value="sex") String sex);
XML文件
<select id="selectTeacher" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} and sex=#{sex} </select>
测试代码
List<Teacher> tList = teacherMapper.selectTeacher("2","男"); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString());
下面再给大家分享MyBatis传参
1、当传参为list 时:
1.1 mapper接口中:
void updateContactsIsRead(List<Integer> logidList);
1.2 mapper.xml 文件中:
<update id="updateContactsIsRead"> update emaillog2 set isRead = 1 where isRead = 0 and logid in <foreach collection="list" item="logid" index="index" open="(" close=")" separator=","> #{logid,jdbcType=INTEGER} </foreach> </update>
以上所述是小编给大家介绍的MyBatis传入参数的实例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对我们网站的支持!
赞 (0)