Question

我正在尝试将Spring Boot应用程序部署到Heroku。它使用RemoteMysl提供的远程数据库。但是，在构建应用程序时，它将创建数据库中除一个表之外的所有表。我在Heroku应用程序日志中收到以下错误。

由于：java.sql.SQLSyntaxErrorException：您的错误 SQL语法；检查与您的MySQL服务器相对应的手册在删除时在'groups（id）附近使用正确语法的版本级联'在第1行

组模型

package com.itsfive.back.model;

import java.util.HashSet;
import java.util.Optional;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;

import org.springframework.web.multipart.MultipartFile;

import com.itsfive.back.model.audit.DateAudit;

@Entity
@Table(name = "groups")
public class Group extends DateAudit{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotBlank
    @Size(max = 30)
    private String name;

    @Size(max = 160)
    private String description;

    @OneToOne
    @JoinColumn(name = "created_by_id", nullable = false)
    private User created_by;    

    private String coverPhoto;

    public User getCreated_by() {
        return created_by;
    }

    public void setCreated_by(User created_by) {
        this.created_by = created_by;
    }

    public String getCoverPhoto() {
        return coverPhoto;
    }

    public void setCoverPhoto(String coverPhoto) {
        this.coverPhoto = coverPhoto;
    }

    public Group(@NotBlank @Size(max = 30) String name, @Size(max = 160) String description,User created_by) {
        super();
        this.name = name;
        this.description = description;
        this.created_by = created_by;
    }

    public Group() {

    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String groupName) {
        this.name = groupName;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public User getCreatedBy() {
        return created_by;
    }

    public void setCreatedBy(User user) {
        this.created_by = user;
    }
}

Answer 1

好吧，我认为您正在使用Mysql 8.0，那么此问题是由于您在表名上使用了Mysql之类的groups保留关键字。

您可以看看SQL reserved words for Mysql 8.0，然后有两个选择

1.-将groups表重命名为users_group或所需的表名。

@Table(name = "users_group")
public class Group extends XXXXX { ... }

2.-强制使用groups表名。

如果您使用的是JPA，则可以使用双引号进行转义：

    @Table(name = "\"groups\"")
    public class Group extends XXXXX { ... }

如果您使用的是Hibernate本机API，则可以使用反引号将其转义：

    @Table(name =  "`groups`")
    public class Group extends XXXXX { ... }

将Spring Boot应用程序部署到Heroku时出现SQLSyntaxErrorException

1 个答案: