修正

springboot_05_mybatis/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

springboot_05_mybatis/pom.xml

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+<?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>3.0.4</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.yv</groupId>
+	<artifactId>springboot_05_mybatis</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>springboot_05_mybatis</name>
+	<description>Demo project for Spring Boot</description>
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.mybatis.spring.boot</groupId>
+			<artifactId>mybatis-spring-boot-starter</artifactId>
+			<version>3.0.0</version>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+			<version>5.1.49</version>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

springboot_05_mybatis/src/main/java/com/yv/Springboot05MybatisApplication.java

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+package com.yv;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author YoVinchen
+ */
+@SpringBootApplication
+public class Springboot05MybatisApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Springboot05MybatisApplication.class, args);
+	}
+
+}

springboot_05_mybatis/src/main/java/com/yv/dao/BookDao.java

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+package com.yv.dao;
+
+import com.yv.domain.Book;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+
+/**
+ * @author YoVinchen
+ * @date 2023/3/9 下午 3:25
+ */
+@Mapper
+public interface BookDao {
+    /**
+     * @param id
+     * @return
+     */
+    @Select("select * from tbl_book where id = #{id}")
+    public Book getById(Integer id);
+}

springboot_05_mybatis/src/main/java/com/yv/domain/Book.java

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+package com.yv.domain;
+
+/**
+ * @author YoVinchen
+ * @date 2023/3/9 下午 3:23
+ */
+
+public class Book {
+    private Integer id;
+    private String  type;
+    private String  name;
+    private String  description;
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "id=" + id +
+                ", type='" + type + '\'' +
+                ", name='" + name + '\'' +
+                ", description='" + description + '\'' +
+                '}';
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}

springboot_05_mybatis/src/main/resources/application.yml

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+#??????
+
+spring:
+  datasource:
+    driver-class-name: com.mysql.jdbc.Driver
+    url: jdbc:mysql://localhost:3306/ssm_db?useSSL=false
+    username: root
+    password: 8520

springboot_05_mybatis/src/test/java/com/yv/Springboot05MybatisApplicationTests.java

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+package com.yv;
+
+import com.yv.dao.BookDao;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class Springboot05MybatisApplicationTests {
+    @Autowired
+    private BookDao bookDao;
+
+
+    @Test
+    void contextLoads() {
+        System.out.println(bookDao.getById(1));
+    }
+
+}