在MyBatis的select、insert、update、delete這些元素中都提到了parameterType這個(gè)屬性。MyBatis現(xiàn)在可以使用的parameterType有基本數(shù)據(jù)類型和JAVA復(fù)雜數(shù)據(jù)類型
基本數(shù)據(jù)類型：包含int,String,Date等?；緮?shù)據(jù)類型作為傳參，只能傳入一個(gè)。通過#{參數(shù)名} 即可獲取傳入的值
復(fù)雜數(shù)據(jù)類型：包含JAVA實(shí)體類、Map。通過#{屬性名}或#{map的KeyName}即可獲取傳入的值
基本數(shù)據(jù)類型參數(shù)示例：
根據(jù)班級(jí)ID查詢教師列表
xml文件
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<select id="selectTeacher" parameterType="int" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} </select> |
java代碼
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List<Teacher> tList = teacherMapper.selectTeacher(2); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); } |
JAVA實(shí)體類型參數(shù)示例：
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<select id="selectTeacher" parameterType="com.myapp.domain.Teacher" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} </select> |
java代碼
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Teacher queryTeacher=new Teacher(); queryTeacher.setId(2); List<Teacher> tList = teacherMapper.selectTeacher(queryTeacher); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); } |
Map參數(shù)示例：
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<select id="selectTeacher" parameterType="Map" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} and sex=#{sex} </select> |
java代碼
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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還提供了一個(gè)使用注解來參入多個(gè)參數(shù)的方式。這種方式需要在接口的參數(shù)上添加@Param注解
示例：
接口方法
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public List<Teacher> selectTeacher(@Param(value="id") String id,@Param(value="sex") String sex); |
XML文件
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<select id="selectTeacher" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} and sex=#{sex} </select> |
測(cè)試代碼
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List<Teacher> tList = teacherMapper.selectTeacher("2","男"); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); |
下面再給大家分享MyBatis傳參
1、當(dāng)傳參為list 時(shí)：
1.1 mapper接口中：
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void updateContactsIsRead(List<Integer> logidList); |
1.2 mapper.xml 文件中：
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<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> |
以上所述是小編給大家介紹的MyBatis傳入?yún)?shù)的實(shí)例代碼，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)服務(wù)器之家網(wǎng)站的支持！
