Springboot 使用 Mybatis
依赖 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>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.draymonder</groupId>
<artifactId>book</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>book</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.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.16</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
配置文件 application.yml
server:
port: 80
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
url: jdbc:mysql:///mybatis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
username: root
password: xxxx
mybatis:
# type-aliases-package: com.draymonder.book.mybatis
mapper-locations: classpath:mappers/*.xml # 映射文件的路径扫描
book实体
package com.draymonder.book.mybatis;
/**
* @auther draymonder
*/
public class Book {
private Integer id;
private String author;
private String name;
@Override
public String toString() {
return "Book{" +
"id=" + id +
", author='" + author + '\'' +
", name='" + name + '\'' +
'}';
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
bookMapper
package com.draymonder.book.mybatis;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
/**
* @auther draymonder
*/
@Mapper
public interface BookMapper {
int addBook(Book book);
int deleteBookById(Integer id);
int updateBookById(Book book);
Book getBookById(Integer id);
List<Book> getAllBooks();
}
bookMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.draymonder.book.mybatis.BookMapper">
<insert id="addBook" parameterType="com.draymonder.book.mybatis.Book">
insert into book(name, author) values(#{name}, #{author})
</insert>
<delete id="deleteBookById" parameterType="int">
delete from book where id = #{id}
</delete>
<update id="updateBookById" parameterType="com.draymonder.book.mybatis.Book">
update book set name=#{name}, author=#{author} where id=#{id}
</update>
<select id="getBookById" parameterType="int" resultType="com.draymonder.book.mybatis.Book">
select * from book where id=#{id}
</select>
<select id="getAllBooks" resultType="com.draymonder.book.mybatis.Book">
select * from book
</select>
</mapper>
bookService
package com.draymonder.book.mybatis;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @auther draymonder
*/
@Service
public class BookService {
@Autowired
private BookMapper bookMapper;
public int addBook(Book book) {
return bookMapper.addBook(book);
}
public int deleteBookById(Integer id) {
return bookMapper.deleteBookById(id);
}
public int updateBookById(Book book) {
return bookMapper.updateBookById(book);
}
public Book getBookById(Integer id) {
return bookMapper.getBookById(id);
}
public List<Book> getAllBooks() {
return bookMapper.getAllBooks();
}
}
bookController
package com.draymonder.book.mybatis;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
/**
* @auther draymonder
*/
@RestController
public class BookController {
@Autowired
BookService bookService;
@GetMapping("/bookOps")
public void bookOps() {
Book b1 = new Book();
b1.setName("西厢记");
b1.setAuthor("王实甫");
int i = bookService.addBook(b1);
System.out.println("add book >>> " + i);
Book b2 = new Book();
b2.setId(1);
b2.setName("朝花夕拾");
b2.setAuthor("鲁迅");
int updateBook = bookService.updateBookById(b2);
System.out.println("update book >>> " + updateBook);
Book b3 = bookService.getBookById(2);
System.out.println("get book >>> " + b3);
// int delete = bookService.deleteBookById(1);
// System.out.println("delete book >>> " + delete);
List<Book> allBooks = bookService.getAllBooks();
allBooks.forEach(System.out::println);
}
}
过程中踩过的坑
- mapper注入不到， 记得配置
application.xml中的mapper-locations: classpath:mappers/*.xml
mysql相关
- You must configure either the server or JDBC driver (via the serverTimezone configuration property)
- 插入的数据是中文的， 但是插入结果是
???
- 解决方案:
jdbc:mysql:///mybatis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC 即url上添加参数
