如图,代码层
UserS.java
package com.fzx.mapper;
import org.springframework.stereotype.Repository;
/**
* @类名:UserMapper.java
* @创建时间:2019年5月7日
* @版本:1.0
*/
@Repository(value = "UserMapper")
public interface UserS {
public Integer getCount() throws Exception;
}
UserMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org/DTD Mapper 3.0" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.fzx.mapper.UserS">
<select id="getCount" resultType="java.lang.Integer">
select count(0) from users
</select>
</mapper>
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="mysql.properties"></properties>
<environments default="">
<environment id="">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<!-- 自动扫描mapper下面的所有xml文件 -->
<package name="com/fzx/mapper"/>
</mappers>
</configuration>
DBTest.java
package com.fzx.test;
import java.io.Reader;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
/**
* @类名:DBTest.java
* @创建时间:2019年5月7日
* @版本:1.0
*/
public class DBTest {
public static SqlSessionFactory sqlSessionFactory;
static {
try {
Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (Exception e) {
e.printStackTrace();
}
}
public static SqlSession getSession() {
return sqlSessionFactory.openSession();
}
}
UserService.java
package com.fzx.Service;
import org.apache.ibatis.session.SqlSession;
import com.fzx.mapper.UserS;
import com.fzx.test.DBTest;
/**
* @类名:UserService.java
* @创建人:付祉旋
* @创建时间:2019年5月7日
* @版本:1.0
*/
public class UserService {
public static void main(String[] args) throws Exception {
SqlSession session = DBTest.getSession();
UserS userMapper = session.getMapper(UserS.class);
System.out.println(userMapper.getCount());
session.commit();
}
}
出现异常:Invalid bound statement (not found): com.fzx.mapper.UserS.getCount,怎么解决尼?在线等~~~