MyBatis之传入参数

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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1. <select id="selectTeacher" parameterType="int" resultType="com.myapp.domain.Teacher">
2. select * from Teacher where c_id=#{id}
3. </select>

  <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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1. List<Teacher> tList = teacherMapper.selectTeacher(2);
2. for (Teacher entityTemp : tList) {
3. System.out.println(entityTemp.toString());
4. }

List<Teacher> tList = teacherMapper.selectTeacher(2);  for (Teacher entityTemp : tList) {      System.out.println(entityTemp.toString());  }  

• JAVA实体类型参数示例：

[html] view plain copy print?

1. <select id="selectTeacher" parameterType="com.myapp.domain.Teacher"resultType="com.myapp.domain.Teacher">
2. select * from Teacher where c_id=#{id}
3. </select>

  <select id="selectTeacher" parameterType="com.myapp.domain.Teacher" resultType="com.myapp.domain.Teacher">  select * from Teacher where c_id=#{id}  </select>

[java] view plain copy print?

1. java代码
3. Teacher queryTeacher=new Teacher();
4. queryTeacher.setId(2);
5. List<Teacher> tList = teacherMapper.selectTeacher(queryTeacher);
6. for (Teacher entityTemp : tList) {
7. System.out.println(entityTemp.toString()); }

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：
  
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  1. <select id="selectTeacher" parameterType="Map" resultType="com.myapp.domain.Teacher">
  2. select * from Teacher where c_id=#{id} and sex=#{sex}
  3. </select>

    <select id="selectTeacher" parameterType="Map" resultType="com.myapp.domain.Teacher">  select * from Teacher where c_id=#{id} and sex=#{sex}  </select>

  
  
  [java] view plain copy print?

  1. java代码
  3. Map<String,String> map=new HasMap<String,String>();
  4. map.put("id","2");
  5. map.put("sex","男");
  6. List<Teacher> tList = teacherMapper.selectTeacher(map);
  7. for (Teacher entityTemp : tList) {
  8. System.out.println(entityTemp.toString()); }

  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

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1. public List<Teacher> selectTeacher(@Param(value="id") String id,@Param(value="sex") String sex);

public List<Teacher> selectTeacher(@Param(value="id") String id,@Param(value="sex") String sex);

XML文件

[html] view plain copy print?

1. <select id="selectTeacher" resultType="com.myapp.domain.Teacher">
2. select * from Teacher where c_id=#{id} and sex=#{sex}
3. </select>

  <select id="selectTeacher"  resultType="com.myapp.domain.Teacher">  select * from Teacher where c_id=#{id} and sex=#{sex}  </select>

测试代码

[java] view plain copy print?

1. List<Teacher> tList = teacherMapper.selectTeacher("2","男");
2. for (Teacher entityTemp : tList) {
3. System.out.println(entityTemp.toString());

转自：http://blog.csdn.net/liaoxiaohua1981/article/details/6862764

List<Teacher> tList = teacherMapper.selectTeacher("2","男");  for (Teacher entityTemp : tList) {      System.out.println(entityTemp.toString());