Spring Boot通过实体类自动创建表时出现创建不上的情况
原因1:
启动类和实体类的包命名问题,但是在2.0版本以上的初始化中,一般根目录和与启动类类名相同的包下会有一个启动类(也就是两个启动类)
解决方案1:
启动类的包名是com.lihao(根)
实体类包名的命名必须是com.lihao.domain或者com.lihao.entity,这样就可以了
原因2:
mysql的可视化工具的问题,例如Navicat、SQLyog的问题
解决方案2:
现在cmd命令行中创建同名的表,判断是否是这个原因,然后 重启mysql的工具 即可本人代码示例:
1、application.yml代码:
spring: thymeleaf: mode: HTML datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/spring_boot?useUnicode=true&characterEncoding=utf-8 username: root password: 123456 jpa: hibernate: ddl-auto: create show-sql: true logging: level: root: info com.atlihao: debug file: log/my.log
2、User类的代码:
package com.lihao.domain; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class User { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String username; private String password; private int phone; private String email; public User() { } public long getId() { return id; } public void setId(long id) { this.id = id; } 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 int getPhone() { return phone; } public void setPhone(int phone) { this.phone = phone; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "User{" + "id=" + id + ", username='" + username + '\'' + ", password='" + password + '\'' + ", phone=" + phone + ", email='" + email + '\'' + '}'; } }
成功结果:
只要run的过程中能出现类似以下的的代码,即表示为成功!
Hibernate: drop table if exists hibernate_sequence
Hibernate: drop table if exists user
Hibernate: create table hibernate_sequence (next_val bigint) engine=MyISAM
Hibernate: insert into hibernate_sequence values ( 1 )
Hibernate: create table user (id bigint not null, email varchar(255), password varchar(255), phone integer not null, username varchar(255), primary key (id)) engine=MyISAM