更新时间:2021-12-21 02:28:21
今天晚上在学习Mybatis注解的时候,总是遇到错误Type interface com.souvi.ibatis.xxxMapper is not known to the MapperRegistry,在网上搜索相关的解决方案时,得到的答案都不怎么详细,但知道了Mybatis注解一定要注册自己写的接口类,不然就会老报开头提到的这个错误。
下面举个例子:先看看项目的简单部署吧,如图:
先看核心文件,UserTest.java
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package com.rollen;
import java.io.*;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class UserTest {
public static void main(String[] args) {
String resource = "com/rollen/configure.xml" ;
Reader reader = null ;
try {
reader = Resources.getResourceAsReader(resource);
} catch (IOException e) {
e.printStackTrace();
}
SqlSessionFactory factory = new SqlSessionFactoryBuilder()
.build(reader);
factory.getConfiguration().addMapper(UserInfoMapper. class );
SqlSession sqlSession = factory.openSession();
try {
UserInfoMapper userInfoMapper = sqlSession
.getMapper(UserInfoMapper. class );
User user = userInfoMapper.getUser( 10 );
System.out.println(user);
} finally {
sqlSession.close();
}
}
} |
主要要注意的是比如要注册,也就是这行代码:
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factory.getConfiguration().addMapper(UserInfoMapper. class );
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UserInfoMapper.java代码如下:
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package com.rollen;
import org.apache.ibatis.annotations.Select;
public interface UserInfoMapper {
@Select ( "select * from user_tb where age= #{age}" )
public User getUser( int age);
} |
user.java 代码如下:
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package com.rollen;
public class User {
private String name;
private int age;
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this .name = name;
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge( int age) {
this .age = age;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
// TODO Auto-generated method stub
return "name: " +name+ "age: " +age;
}
} |
最后的configure.xml文件代码为:
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<?xml version= "1.0" encoding= "UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" <configuration> <typeAliases>
<typeAlias alias= "User" type= "com.rollen.User" />
</typeAliases>
<environments default = "development" >
<environment id= "development" >
<transactionManager type= "JDBC" />
<dataSource type= "POOLED" >
<property name= "driver" value= "com.mysql.jdbc.Driver" />
<property name= "username" value= "root" />
<property name= "password" value= "root" />
</dataSource>
</environment>
</environments>
</configuration> |
参考文章:http://www.laokboke.net/2012/09/25/mybatis-annotation/