MyBatis的Mapper配置文件的parameterType用法 - 数据库编程

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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List 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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java代码

Teacher queryTeacher=new Teacher(); queryTeacher.setId(2);

List tList = teacherMapper.selectTeacher(queryTeacher); for (Teacher entityTemp : tList) {

System.out.println(entityTemp.toString()); }

Map参数示例：
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java代码

Map map=new HasMap(); map.put("id","2");

map.put("sex","男"); List tList = teacherMapper.selectTeacher(map);

for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); } [java] view plaincopy

public List selectTeacher(@Param(value="id") String id,@Param(value="sex") String sex); [html] view plaincopy

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List tList = teacherMapper.selectTeacher("2","男"); for (Teacher entityTemp : tList) {

System.out.println(entityTemp.toString());