springboot-整合mybatis

一、引入依賴

pom.xml：

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

    <!--數據庫驅動-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
。。。。。。
<!-- maven項目中src源代碼下的xml等資源文件編譯進classes文件夾，
      注意：若是沒有這個，它會自動搜索resources下是否有mapper.xml文件，
      若是沒有就會報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.、配置數據庫

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

三、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用於綁定Dao接口的，即面向接口編程。
它的好處在於當使用了namespace以後就能夠不用寫接口實現類，業務邏輯會直接經過這個綁定尋找到相對應的SQL語句進行對應的數據處理-->
<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>

四、App啓動類

App.class：

@EnableAutoConfiguration
@MapperScan(basePackages = {"com.springboot.mapper"})//注意：@MapperScan配置成com.springboot.*，會出現如下異常：
//org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.springboot.service.userService.getUserList
@ComponentScan(basePackages = {"com.springboot.*","com.springboot.*.*"})//組件掃描，配置掃描的包
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        //啓動springboot項目
        SpringApplication.run(App.class,args);
        System.out.println( "success..." );
    }
}

五、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：

一、若是接口文件名UserMapper和配置文件名UserMapper.xml名稱不一樣時，會出現

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

二、@MapperScan配置成com.springboot.*，會出現如下異常：

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

 三、接口和配置文件在同一個文件夾下且名稱一致