springboot-整合mybatis

1、引入依赖

pom.xml：

<!--引入mybatis依赖（使用mybatis时配置）-->
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.1.1</version>
    </dependency>

    <!--数据库驱动-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
。。。。。。
<!-- maven项目中src源代码下的xml等资源文件编译进classes文件夹，
      注意：如果没有这个，它会自动搜索resources下是否有mapper.xml文件，
      如果没有就会报org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.pet.mapper.PetMapper.selectByPrimaryKey-->
<build>
  <resources>
    <resource>
      <directory>src/main/java</directory>
      <includes>
        <include>**/*.xml</include>
      </includes>
    </resource>
  </resources>
</build>

2.、配置数据库

application.properties：

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mysql-boot
spring.datasource.username=root
spring.datasource.password=123123
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3、Mybatis文本：

UserMapper.xml：

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

<!--在MyBatis中，Mapper中的namespace用于绑定Dao接口的，即面向接口编程。
它的好处在于当使用了namespace之后就可以不用写接口实现类，业务逻辑会直接通过这个绑定寻找到相对应的SQL语句进行对应的数据处理-->
<mapper namespace="com.springboot.mapper.UserMapper">
    <select id="getUserList" parameterType="com.springboot.model.User" resultType="com.springboot.model.User">
        select id,name,passWord from tb_user where 1=1
        order by ranking asc
    </select>

    <select id="getUserInfo" parameterType="string" resultType="com.springboot.model.User">
        select id,name,passWord from tb_user where id=#{id}
    </select>
</mapper>

4、App启动类

App.class：

@EnableAutoConfiguration
@MapperScan(basePackages = {"com.springboot.mapper"})//注意：@MapperScan配置成com.springboot.*，会出现以下异常：
//org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.springboot.service.userService.getUserList
@ComponentScan(basePackages = {"com.springboot.*","com.springboot.*.*"})//组件扫描，配置扫描的包
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        //启动springboot项目
        SpringApplication.run(App.class,args);
        System.out.println( "success..." );
    }
}

5、interface

UserMapper.class

package com.springboot.mapper;

import com.springboot.model.User;

import java.util.List;

public interface UserMapper {
    public List<User> getUserList(User user);

    public User getUserInfo(String id);
}

注意：

1、如果接口文件名UserMapper和配置文件名UserMapper.xml名称不同时，会出现

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.springboot.mapper.UserMapper.getUserList

2、@MapperScan配置成com.springboot.*，会出现以下异常：

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.springboot.service.userService.getUserList

 3、接口和配置文件在同一个文件夹下且名称一致