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
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<select id= "selectTeacher" parameterType= "int" resultType= "com.myapp.domain.Teacher" > select * from Teacher where c_id=#{id} </select> |
java代码
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List<Teacher> tList = teacherMapper.selectTeacher( 2 ); for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); } |
JAVA实体类型参数示例:
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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代码
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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参数示例:
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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代码
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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
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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> |
测试代码
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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:
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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服务器之家网站的支持!