版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Thinkingcao/article/details/87790879
本文主要讲解如何在springboot下整合mybatis，并访问数据库。由于mybatis这个框架太过于流行，所以我就不讲解了。
引入依赖
在pom文件引入mybatis-spring-boot-starter的依赖：
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter<artifactId>
<version>1.3.0</version>
</dependency>
引入数据库连接依赖：
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
完整的pom依赖
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.thinkingcao</groupId>
<artifactId>springboot-mybatis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-mybatis</name>
<description>Demo project for Spring Boot</description>
<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.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-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>引入数据源
application.yml配置文件中引入数据源：
#spring.datasource.url=jdbc:mysql://localhost:3306/test
#spring.datasource.username=root
#spring.datasource.password=123456
#spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring:
datasource:
url: jdbc:mysql://localhost:3306/test
data-username: root
data-password: 123456
driver-class-name: com.mysql.jdbc.Driver
这样，springboot就可以访问数据了。
创建数据库表
建表语句：
-- create table `account`
# DROP TABLE `account` IF EXISTS
CREATE TABLE `account` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(20) NOT NULL,
`money` double DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
INSERT INTO `account` VALUES ('1', 'aaa', '1000');
INSERT INTO `account` VALUES ('2', 'bbb', '1000');
INSERT INTO `account` VALUES ('3', 'ccc', '1000');
具体实现
这篇文篇通过注解的形式实现。
创建实体：
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;
/**
* <pre>
*
* @auther: cao_wencao
* @date: 2019/2/20 13:34
* </pre>
*/
@Data
@ToString
@AllArgsConstructor
public class Account {
private int id ;
private String name ;
private double money;
}
dao层
@Mapper
public interface AccountMapper {
@Insert("insert into account(name, money) values(#{name}, #{money})")
int add(@Param("name") String name, @Param("money") double money);
@Update("update account set name = #{name}, money = #{money} where id = #{id}")
int update(@Param("name") String name, @Param("money") double money, @Param("id") int id);
@Delete("delete from account where id = #{id}")
int delete(int id);
@Select("select id, name as name, money as money from account where id = #{id}")
Account findAccount(@Param("id") int id);
@Select("select id, name as name, money as money from account")
List<Account> findAccountList();
}
service层
@Service
public class AccountService {
@Autowired
private AccountMapper accountMapper;
public int add(String name, double money) {
return accountMapper.add(name, money);
}
public int update(String name, double money, int id) {
return accountMapper.update(name, money, id);
}
public int delete(int id) {
return accountMapper.delete(id);
}
public Account findAccount(int id) {
return accountMapper.findAccount(id);
}
public List<Account> findAccountList() {
return accountMapper.findAccountList();
}
}
controller层，构建restful API
package com.forezp.web;
import com.forezp.entity.Account;
import com.forezp.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* <pre>
*
* @auther: cao_wencao
* @date: 2019/2/20 13:39
* </pre>
*/
@RestController
@RequestMapping("/account")
public class AccountController {
@Autowired
AccountService accountService;
@RequestMapping(value = "/list", method = RequestMethod.GET)
public List<Account> getAccounts() {
return accountService.findAccountList();
}
@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public Account getAccountById(@PathVariable("id") int id) {
return accountService.findAccount(id);
}
@RequestMapping(value = "/{id}", method = RequestMethod.PUT)
public String updateAccount(@PathVariable("id") int id, @RequestParam(value = "name", required = true) String name,
@RequestParam(value = "money", required = true) double money) {
int t= accountService.update(name,money,id);
if(t==1) {
return "success";
}else {
return "fail";
}
}
@RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
public String delete(@PathVariable(value = "id")int id) {
int t= accountService.delete(id);
if(t==1) {
return "success";
}else {
return "fail";
}
}
@RequestMapping(value = "", method = RequestMethod.POST)
public String postAccount(@RequestParam(value = "name") String name,
@RequestParam(value = "money") double money) {
int t= accountService.add(name,money);
if(t==1) {
return "success";
}else {
return "fail";
}
}
}
通过postman测试通过。