spring boot 学习笔记（008）mysql

来源：互联网发布：与sqlserver建立连接编辑：程序博客网时间：2024/04/30 05:53

spring boot默认使用 Hibernate 来实现jpa

只用最快方式打通数据库操作。

1，修改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 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>hui.study.demo</groupId>    <artifactId>springboot</artifactId>    <version>1.0-SNAPSHOT</version>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.2.3.RELEASE</version>    </parent>    <dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency>    <groupId>mysql</groupId>    <artifactId>mysql-connector-java</artifactId></dependency>    </dependencies></project>

增加了两个依赖：

spring-boot-starter-data-jpa和mysql-connector-java

2，

在命令行中，CD到工程目录，执行mvn eclipse:eclipse

然后回到STS，右键工程，刷新

3，本机安装好mysql，并且建库建用户，然后赋权限。这一步就不详细描述了。

不需要建表，直接在代码里就可以注入配置。

4，修改application.properties文件，增加下列内容：

spring.datasource.url = jdbc:mysql://localhost:3306/AAAAAAAAspring.datasource.username = rootspring.datasource.password = #########spring.datasource.driverClassName = com.mysql.jdbc.Driver# Specify the DBMSspring.jpa.database = MYSQL# Show or not log for each sql queryspring.jpa.show-sql = true# Hibernate ddl auto (create, create-drop, update)spring.jpa.hibernate.ddl-auto = update# Naming strategyspring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy# stripped before adding them to the entity manager)spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

把AAAAAAA替换成数据库名，root改成对应的用户，#######改成密码。

记得运行 mvn -X clean install

参照上一篇文章 007

5，修改UserInfo.java

package springboot;import javax.persistence.Entity;import javax.persistence.Id;import javax.persistence.Table;@Entity@Table(name = "userinfo")public class UserInfo{@Idprivate String userCode;private String userName;private String deptCode;public String getUserCode() {return userCode;}public void setUserCode(String userCode) {this.userCode = userCode;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getDeptCode() {return deptCode;}public void setDeptCode(String deptCode) {this.deptCode = deptCode;}}

这时可以运行了工程了。运行后，发现数据库中多了一张表：UserInfo

6，增加对表的操作

新建interface: UserDao

package springboot;import javax.transaction.Transactional;import org.springframework.data.repository.CrudRepository;@Transactionalpublic interface UserDao extends CrudRepository<UserInfo, Long> {  public UserInfo findByDeptCode(String deptCode);}

7，修改HelloWorld.java，修改方法：

@RequestMapping(value="/trequest", method = RequestMethod.POST)  @ResponseBody    public UserInfo trequest(@RequestBody UserInfo pu){logger.log(Level.INFO, "just test the log. (/trequest)");UserInfo u = new UserInfo();u.setUserCode(pu.getUserCode());u.setUserName(pu.getUserName());u.setDeptCode(pu.getDeptCode());userdao.save(u);return u;    }

这时，访问
http://localhost:8090/

Request内容填：

{"userCode":"ABC001", "userName":"第一个用户", "deptCode":"CC001"}

返回成功。看数据库中，多了一条数据了。

打完收工。都是快速打通经脉，没有仔细研究所以然，后面再慢慢积累内功吧。

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