SpringBoot整合Mybatis-plus的具體過程使用

更新時間：2022年06月27日 08:36:12 作者：鳴鼓ming

這篇文章主要介紹了SpringBoot?整合mybatis+mybatis-plus的步驟,本文通過圖文并茂的形式給大家介紹的非常詳細(xì)，對大家的學(xué)習(xí)或工作具有一定的參考借鑒價值，需要的朋友可以參考下

1.MyBatisX插件

在使用mybatis或者mybatis-plus時,我們可以安裝IDEA的MyBatis的插件 - MyBatisX,

這樣我們就可以實現(xiàn)點擊接口跳轉(zhuǎn)到sql文件, 點擊sql文件可以跳轉(zhuǎn)到接口的功能, 很方便.這個插件的功能還有很多, 可以查看MyBatis-Plus官網(wǎng)

安裝方法：打開 IDEA，進入 File -> Settings -> Plugins -> Browse Repositories，輸入 mybatisx 搜索并安裝, 然后重啟IDEA。

點擊小鳥可實現(xiàn)跳轉(zhuǎn)

2.引入依賴

在pom.xml添加如下依賴

 <!--數(shù)據(jù)庫相關(guān)-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.17</version>
        </dependency>

3.編寫配置

application.properties

server.port=8080
spring.datasource.url=jdbc:mysql://localhost:3306/db_springtest?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

#----------------------------配置mybatis-plus---------------------------
#配置sql文件路徑
mybatis-plus.mapper-locations=classpath:/mapper/*.xml
#開啟駝峰命名映射
mybatis-plus.configuration.map-underscore-to-camel-case=true
## 自定義sql中表名帶前綴, 默認(rèn)是實體名的小寫, 如user, 但是數(shù)據(jù)庫中是t_user, 所以設(shè)置加上前綴
mybatis-plus.global-config.db-config.table-prefix=t_

#----------------------------配置druid--------------------------------
#監(jiān)控SpringBean
spring.datasource.druid.aop-patterns=com.limi.springboottest2.*
# 底層開啟功能，stat（sql監(jiān)控），wall（防火墻）
spring.datasource.druid.filters=stat,wall

# 配置監(jiān)控頁功能
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=123456
spring.datasource.druid.stat-view-servlet.reset-enable=false

# 監(jiān)控web
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions='*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'

# 對上面filters里面的stat的詳細(xì)配置
spring.datasource.druid.filter.stat.slow-sql-millis=1000
spring.datasource.druid.filter.stat.log-slow-sql=true
spring.datasource.druid.filter.stat.enabled=true
spring.datasource.druid.filter.wall.enabled=true
spring.datasource.druid.filter.wall.config.drop-table-allow=false

4.編寫接口

UserMapper

package com.limi.springboottest2.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.limi.springboottest2.entity.User;
import org.springframework.stereotype.Repository;
@Repository
public interface UserMapper extends BaseMapper<User> {
    User getUserById(Integer id);
}

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">
<!--
        namespace：必須有值，自定義的唯一字符串
        推薦使用：dao 接口的全限定名稱 -->
<mapper namespace="com.limi.springboottest2.mapper.UserMapper">
    <select id="getUserById" resultType="com.limi.springboottest2.entity.User">
        select * from t_user where id = #{id}
    </select>
</mapper>

注意要開啟mapper接口文件的掃描

SpringbootTest2Application

package com.limi.springboottest2;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
@MapperScan("com.limi.springboottest2.mapper")//掃描mapper
public class SpringbootTest2Application {
    public static void main(String[] args) {
        //1、返回我們IOC容器
        ConfigurableApplicationContext run = SpringApplication.run(SpringbootTest2Application.class, args);
    }
}

5.運行測試

HelloController

package com.limi.springboottest2.controller;
import com.limi.springboottest2.entity.User;
import com.limi.springboottest2.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
public class HelloController {
    @Autowired
    private UserMapper userMapper;
    //測試自己編寫sql語句的查詢方法
    @ResponseBody
    @GetMapping("/getUser/{id}")
    public User test1(@PathVariable("id") Integer id){
        User user = userMapper.getUserById(id);
        return user;
    }
    //測試mybatis-plus內(nèi)置的查詢方法
    @ResponseBody
    @GetMapping("/getAllUser")
    public List<User> test2(){
        List<User> userList = userMapper.selectList(null);//查詢所有
        return userList;
    }
}

6.完整代碼

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.limi</groupId>
    <artifactId>springboot-test2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-test2</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <!--數(shù)據(jù)庫相關(guān)-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.17</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
            <!-- 下面插件作用是工程打包時，不將spring-boot-configuration-processor打進包內(nèi)，讓其只在編碼的時候有用 -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.springframework.boot</groupId>
                            <artifactId>spring-boot-configuration-processor</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

application.properties

server.port=8080
spring.datasource.url=jdbc:mysql://localhost:3306/db_springtest?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

#----------------------------配置mybatis-plus---------------------------
#配置sql文件路徑
mybatis-plus.mapper-locations=classpath:/mapper/*.xml
#開啟駝峰命名映射
mybatis-plus.configuration.map-underscore-to-camel-case=true
## 自定義sql中表名帶前綴, 默認(rèn)是實體名的小寫, 如user, 但是數(shù)據(jù)庫中是t_user, 所以設(shè)置加上前綴
mybatis-plus.global-config.db-config.table-prefix=t_

#----------------------------配置druid--------------------------------
#監(jiān)控SpringBean
spring.datasource.druid.aop-patterns=com.limi.springboottest2.*
# 底層開啟功能，stat（sql監(jiān)控），wall（防火墻）
spring.datasource.druid.filters=stat,wall

# 配置監(jiān)控頁功能
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=123456
spring.datasource.druid.stat-view-servlet.reset-enable=false

# 監(jiān)控web
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions='*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'

# 對上面filters里面的stat的詳細(xì)配置
spring.datasource.druid.filter.stat.slow-sql-millis=1000
spring.datasource.druid.filter.stat.log-slow-sql=true
spring.datasource.druid.filter.stat.enabled=true
spring.datasource.druid.filter.wall.enabled=true
spring.datasource.druid.filter.wall.config.drop-table-allow=false

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">
<!--
        namespace：必須有值，自定義的唯一字符串
        推薦使用：dao 接口的全限定名稱 -->
<mapper namespace="com.limi.springboottest2.mapper.UserMapper">
    <select id="getUserById" resultType="com.limi.springboottest2.entity.User">
        select * from t_user where id = #{id}
    </select>
</mapper>

SpringbootTest2Application

package com.limi.springboottest2;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
@MapperScan("com.limi.springboottest2.mapper")//掃描mapper
public class SpringbootTest2Application {
    public static void main(String[] args) {
        //1、返回我們IOC容器
        ConfigurableApplicationContext run = SpringApplication.run(SpringbootTest2Application.class, args);
    }
}

User

package com.limi.springboottest2.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User {
    private Integer id;
    private String userName;
    private String passWord;
}

UserMapper

package com.limi.springboottest2.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User {
    private Integer id;
    private String userName;
    private String passWord;
}

HelloController

package com.limi.springboottest2.controller;
import com.limi.springboottest2.entity.User;
import com.limi.springboottest2.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
public class HelloController {
    @Autowired
    private UserMapper userMapper;
    //測試自己編寫sql語句的查詢方法
    @ResponseBody
    @GetMapping("/getUser/{id}")
    public User test1(@PathVariable("id") Integer id){
        User user = userMapper.getUserById(id);
        return user;
    }
    //測試mybatis-plus內(nèi)置的查詢方法
    @ResponseBody
    @GetMapping("/getAllUser")
    public List<User> test2(){
        List<User> userList = userMapper.selectList(null);//查詢所有
        return userList;
    }
}

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