springboot注解方式集成Mybatis

1、pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>

<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>springbootMybatis</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.11</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-joda</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-parameter-names</artifactId>
</dependency>
<!-- 分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.1.2</version>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.0</version>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!-- mybatis generator 自动生成代码插件 -->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
<overwrite>true</overwrite>
<verbose>true</verbose>
</configuration>
</plugin>
</plugins>
</build>

</project>
2、使用mybatis generator 自动生成代码：

配置pom.xml中generator 插件所对应的配置文件 
${basedir}/src/main/resources/generator/generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
<classPathEntry  location="E:\repository-maven\mysql\mysql-connector-java\5.1.26\mysql-connector-java-5.1.26.jar"/>
<context id="DB2Tables"  targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接URL，用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/test" userId="root" password="88075998">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="main.java.com.example.demo.model" targetProject="src">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="main.resources.mapping" targetProject="src">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="main.java.com.example.demo.mapper" targetProject="src">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
<table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>

添加配置




运行



最后生成的目录结构为



3、我们还需要修改有点东西，因为生成的类中的路径写了全路径，所以我们要把前面多余的删掉

对于映射文件xml有一个快捷的方式把所有德多余的代码一次删掉： 
Ctrl+F 进行搜索“main.java."


4、application.properties添加相关配置

　　SpringBoot会自动加载application.properties配置文件，会读取spring.datasource.*相关的配置，数据源会自动注入到sqlSessionFactory中，sqlSessionFactory会自动注入到Mapper中

　　会扫描的model实体类路径

# 服务端口
server.port=8004
server.contextPath=/springbootMybatis/
server.session.timeout=10
server.tomcat.uri-encoding=UTF-8

# 项目contextPath，一般在正式发布版本中，我们不配置
#server.context-path=/myspringboot
# 错误页，指定发生错误时，跳转的URL。请查看BasicErrorController源码便知
#server.error.path=/error
# session最大超时时间(分钟)，默认为30
#server.session-timeout=60
# 该服务绑定IP地址，启动服务器时如本机不是该IP地址则抛出异常启动失败，只有特殊需求的情况下才配置
# server.address=192.168.16.11

# tomcat最大线程数，默认为200
#server.tomcat.max-threads=800
## tomcat的URI编码
#server.tomcat.uri-encoding=UTF-8
## 存放Tomcat的日志、Dump等文件的临时文件夹，默认为系统的tmp文件夹（如：C:\Users\Shanhy\AppData\Local\Temp）
#server.tomcat.basedir=H:/springboot-tomcat-tmp
## 打开Tomcat的Access日志，并可以设置日志格式的方法：
##server.tomcat.access-log-enabled=true
##server.tomcat.access-log-pattern=
## accesslog目录，默认在basedir/logs
##server.tomcat.accesslog.directory=
## 日志文件目录
#logging.path=H:/springboot-tomcat-tmp
## 日志文件名称，默认为spring.log
#logging.file=myapp.log

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=88075998
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5

#pagehelper分页插件
pagehelper.helper-dialect=mysql
pagehelper.reasonable=true
pagehelper.support-methods-arguments=true
pagehelper.params=count=countSql5、建立启动类

package com.example.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.example.demo.mapper") //将项目中对应的mapper类的路径加进来就可以了
public class SpringbootMybatisApplication {

public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisApplication.class, args)
b5ff
;
}
}

或可以在mapper类上添加注解@Mapper

6、mapper文件配置
package com.example.demo.mapper;

import com.example.demo.model.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Service;

import java.util.List;

@Mapper
public interface UserMapper {
// int deleteByPrimaryKey(Integer id);
//
// int insert(User record);
//
// int insertSelective(User record);
//
// User selectByPrimaryKey(Integer id);
//
// int updateByPrimaryKeySelective(User record);
//
// int updateByPrimaryKey(User record);

@Select("SELECT * FROM USER WHERE username = #{username}")
User findUserByName(@Param("username") String username);

@Insert("INSERT INTO USER(USERNAME, PASSWORD, ID) VALUES(#{username}, #{password}, #{id})")
int insert(@Param("username") String username, @Param("password") String password, @Param("id") Integer id);

@Select("SELECT * FROM USER")
List<User> finAllUser();

}7、最后可以自己编写controller类或单元测试类进行测试下