文章目錄

• spingboot和mybatis整合
• • 純注解方式，不使用xml
  • • 1. 創建數據庫
    • 2. 建立工程，spring initizer: web + jbdc + mysql + mybatis,pom.xml如下：
    • 3. 針對表t_user創建一個類，針對一個表數據，也可以叫做結構體，數據類型，一般的實體（也就是數據類型）放在pojo下面：
    • 4. 為這個表創建方法，這個方法還必須和mysql map起來，也就是一個方法對應著對應的sql語句，對數據庫的操作都是放在mapper下面
    • 5. 顯示出來，controller里面調用對應的方法：
    • 6. 附錄

spingboot和mybatis整合

純注解方式，不使用xml

1. 創建數據庫

DROP DATABASE IF EXISTS `socks`; CREATE DATABASE `socks`; USE `SOCKS`; DROP TABLE IF EXISTS `t_user`; CREATE TABLE `t_user` (`USER_ID` varchar(50) ,`USERNAME` varchar(50) ,`PASSWORD` varchar(50) ,`PHONE_NUM` varchar(15) ) ;INSERT INTO `t_user` VALUES ('1', 'admin', 'admin','15011791234'); INSERT INTO `t_user` VALUES ('2', 'roots', 'roots','18812342017');

2. 建立工程，spring initizer: web + jbdc + mysql + mybatis,pom.xml如下：

<?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><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.mybatis</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><name>demo</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-jdbc</artifactId></dependency><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>2.0.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></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>

3. 針對表t_user創建一個類，針對一個表數據，也可以叫做結構體，數據類型，一般的實體（也就是數據類型）放在pojo下面：

4. 為這個表創建方法，這個方法還必須和mysql map起來，也就是一個方法對應著對應的sql語句，對數據庫的操作都是放在mapper下面

這里面的問題是，User的數據名和數據庫里面的數據名不一致，數據庫里面喜歡用下劃線，要么開啟駝峰映射，要么直接使用@Results一一對應這個是一勞永逸的方法。

@Mapper public interface UserMapper {@Select("select * from t_user")@Results({@Result(property = "userId", column = "USER_ID"),@Result(property = "username", column = "USERNAME"),@Result(property = "password", column = "PASSWORD"),@Result(property = "mobileNum", column = "PHONE_NUM")})List<User> list();}

5. 顯示出來，controller里面調用對應的方法：

(先寫函數或者變量，在寫注解，注解是作用其上的)

@RestController @RequestMapping("/user/*") public class UserController {@SuppressWarnings("all")@AutowiredUserMapper userMapper;@GetMapping("list")public List<User> list() {return userMapper.list();} }

6. 附錄

application.yml

spring:datasource:#連接MySQLurl: jdbc:mysql://localhost:3306/socks?useSSL=false&serverTimezone=GMT%2B8username: rootpassword: 880808driver-class-name: com.mysql.jdbc.Drivermybatis:configuration:#配置項：開啟下劃線到駝峰的自動轉換. 作用：將數據庫字段根據駝峰規則自動注入到對象屬性。map-underscore-to-camel-case: truelogging:level:#打印SQL信息com.mybatis.demo.mapper: debug

pojo.User.java

public class User {private String userId;private String username;private String password;private String mobileNum;public String getUserId() {return userId;}public void setUserId(String userId) {this.userId = userId;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getMobileNum() {return mobileNum;}public void setMobileNum(String mobileNum) {this.mobileNum = mobileNum;} }

mapper.UserMapper.java

@Mapper public interface UserMapper {@Select("select * from t_user")@Results({@Result(property = "userId", column = "USER_ID"),@Result(property = "username", column = "USERNAME"),@Result(property = "password", column = "PASSWORD"),@Result(property = "mobileNum", column = "PHONE_NUM")})List<User> list();}

controller.UserController.java

@RestController @RequestMapping("/user/*") public class UserController {@SuppressWarnings("all")@AutowiredUserMapper userMapper;@GetMapping("list")public List<User> list() {return userMapper.list();} }

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