MyBatis之传入参数
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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[*]<selectid="selectTeacher"parameterType="int"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}
[*]</select>
java代码
view plaincopy
[*]List<Teacher>tList=teacherMapper.selectTeacher(2);
[*]for(TeacherentityTemp:tList){
[*]System.out.println(entityTemp.toString());
[*]}
[*]JAVA实体类型参数示例：
view plaincopy
[*]<selectid="selectTeacher"parameterType="com.myapp.domain.Teacher"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}
[*]</select>
view plaincopy
[*]java代码
[*]
[*]TeacherqueryTeacher=newTeacher();
[*]queryTeacher.setId(2);
[*]List<Teacher>tList=teacherMapper.selectTeacher(queryTeacher);
[*]for(TeacherentityTemp:tList){
[*]System.out.println(entityTemp.toString());}
[*]Map参数示例：
view plaincopy
[*]<selectid="selectTeacher"parameterType="Map"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}andsex=#{sex}
[*]</select>
view plaincopy
[*]java代码
[*]
[*]Map<String,String>map=newHasMap<String,String>();
[*]map.put("id","2");
[*]map.put("sex","男");
[*]List<Teacher>tList=teacherMapper.selectTeacher(map);
[*]for(TeacherentityTemp: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
view plaincopy
[*]publicList<Teacher>selectTeacher(@Param(value="id")Stringid,@Param(value="sex")Stringsex);
XML文件
view plaincopy
[*]<selectid="selectTeacher"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}andsex=#{sex}
[*]</select>
测试代码
view plaincopy
[*]List<Teacher>tList=teacherMapper.selectTeacher("2","男");
[*]for(TeacherentityTemp:tList){
[*]System.out.println(entityTemp.toString());
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
view plaincopy
[*]<selectid="selectTeacher"parameterType="int"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}
[*]</select>
java代码
view plaincopy
[*]List<Teacher>tList=teacherMapper.selectTeacher(2);
[*]for(TeacherentityTemp:tList){
[*]System.out.println(entityTemp.toString());
[*]}
[*]JAVA实体类型参数示例：
view plaincopy
[*]<selectid="selectTeacher"parameterType="com.myapp.domain.Teacher"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}
[*]</select>
view plaincopy
[*]java代码
[*]
[*]TeacherqueryTeacher=newTeacher();
[*]queryTeacher.setId(2);
[*]List<Teacher>tList=teacherMapper.selectTeacher(queryTeacher);
[*]for(TeacherentityTemp:tList){
[*]System.out.println(entityTemp.toString());}
[*]Map参数示例：
view plaincopy
[*]<selectid="selectTeacher"parameterType="Map"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}andsex=#{sex}
[*]</select>
view plaincopy
[*]java代码
[*]
[*]Map<String,String>map=newHasMap<String,String>();
[*]map.put("id","2");
[*]map.put("sex","男");
[*]List<Teacher>tList=teacherMapper.selectTeacher(map);
[*]for(TeacherentityTemp: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
view plaincopy
[*]publicList<Teacher>selectTeacher(@Param(value="id")Stringid,@Param(value="sex")Stringsex);
XML文件
view plaincopy
[*]<selectid="selectTeacher"resultType="com.myapp.domain.Teacher">
[*]select*fromTeacherwherec_id=#{id}andsex=#{sex}
[*]</select>
测试代码
view plaincopy
[*]List<Teacher>tList=teacherMapper.selectTeacher("2","男");
[*]for(TeacherentityTemp:tList){
[*]System.out.println(entityTemp.toString());
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