MyBatis之传入参数的详细介绍

• 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());

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