尽管配置了正确的方言，为什么Hibernate仍会导致SQL语法错误？

问题描述

我很困惑。我正在建立一个新的spring boot项目。我创建了几个实体类。它可以在数据库中创建一半的表，因此我知道大部分情况下都可以连接到数据库。我检查了一下，并在配置中设置了方言-我使用的是org.hibernate.dialect.MysqLDialect。当我尝试运行问题时，我会不断收到这样的错误：

Caused by: java.sql.sqlSyntaxErrorException: You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near 'integer,symbol varchar(5),primary key (id)) engine=InnoDB' at line 1

我尝试检查google和其他stackoverflow问题，但无济于事。通常，我发现的内容会指导我确保设置正确的方言，并避免检查保留的关键字。

这是另外两个出现的错误：

Caused by: java.sql.sqlSyntaxErrorException: You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near 'integer,primary key (id)) type=MyISAM' at line 1

Caused by: java.sql.sqlSyntaxErrorException: You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near 'varchar(255),clock_in varchar(255),clock_out varchar(255),coin varchar(255),' at line 1

编辑：这是hibernate生成的sql：

Hibernate: create table record (id integer not null,cash varchar(255),check varchar(255),primary key (id)) type=MyISAM

create table route (id integer not null,name varchar(100),color integer,driver varchar(255),index integer,primary key (id)) type=MyISAM

create table store (id integer not null,address varchar(255),symbol varchar(255),primary key (id)) type=MyISAM

编辑2-这是似乎在自动表生成方面遇到麻烦的实体类之一：

package org.tampasa.kettles.models;

import javax.persistence.Entity;

@Entity
public class Store extends AbstractEntity{

    private String address;

    private String symbol;

    private int index;

    // Constructors

    public Store() {
    }


    // Getters and Setters

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getSymbol() {
        return symbol;
    }

    public void setSymbol(String symbol) {
        this.symbol = symbol;
    }

    public Integer getIndex() {
        return index;
    }

    public void setIndex(Integer index) {
        this.index = index;
    }

}

这是AbstractEntity：

package org.tampasa.kettles.models;

import org.hibernate.validator.constraints.Length;

import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.validation.constraints.NotBlank;
import java.util.Objects;

@MappedSuperclass
public abstract class AbstractEntity {

    @Id
    @GeneratedValue
    private int id;

    @NotBlank(message = "Name must not be blank")
    @Length(min = 1,max = 100,message = "Name must be between 1 and 100 characters")
    private String name;

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return name;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        AbstractEntity that = (AbstractEntity) o;
        return id == that.id;
    }

    @Override
    public int hashCode() {
        return Objects.hash(id);
    }

}

解决方法

一个可能的原因可能是列name和index使用SQL保留字。至少在MySQL 8.0中。而且通常也是。我偶然发现了too。：D

根据this answer，您可以将hibernate.globally_quoted_identifiers=true行添加到.properties文件中。这应该使Hibernate转义保留字，并且也许可以解决您遇到的问题。

java java mysql spring-data-jpa