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SpringBoot整合mybatis简单案例过程解析

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这篇文章主要介绍了SpringBoot整合mybatis简单案例过程解析,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

1.在springboot项目中的pom.xml中添加mybatis的依赖

<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>1.1.1</version>
</dependency>

2.在src/main/resources/application.yml中配置数据源信息

# DB Configation
spring:
 datasource:
  driver-class-name: com.mysql.jdbc.Driver
  url: jdbc:mysql://127.0.0.1:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone = GMT
  username: root
  password: root

# JAPConfigration
 jpa:
  database: mysql
  show-sql: true
  generate-ddl: true

在连接数据库的过程中可能会出现SQLException,可能是时区问题导致的,加上url路径后面的“serverTimezone = GMT”即可

3.在主启动类的同级创建po包和mapper包,在po包中创建实体类,编写pojo;在mapper包中创建mapper接口和mapper映射文件

mapper.java

package com.hxy.springbootdemo1.demo.mapper;

import com.hxy.springbootdemo1.demo.pojo.MUser;

import java.util.List;

public interface UserMapper {
  List<MUser> getUserList();
}

mapper.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">
<mapper namespace="com.hxy.springbootdemo1.demo.mapper.UserMapper">
  <select id="getUserList" resultType="com.hxy.springbootdemo1.demo.pojo.MUser">
    select * from user
  </select>
</mapper>

4.手动配置mybatis的包扫描

  在主启动类添加@MapperScan

  如果出现错误:org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.offcn.mapper.UserMapper.getUserList

  有如下两种方法解决:

  1 把映射文件 放到resources 目录下 结构目录一模一样

  2 修改配置文件pom.xml

<build>
    <resources>
      <resource>
        <directory>src/main/java</directory>
         <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
         </includes>
        <filtering>false</filtering>
      </resource>
    <resource>
      <directory>src/main/resources</directory>
        <includes>
          <include>**/*.*</include>
        </includes>
        <filtering>false</filtering>
    </resource>
  </resources>
 </build>
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