Spring Boot：MySQL尝试将客户映射到项目时出现重复键错误

时间：2018-06-06 01:46:28

标签： mysql spring hibernate spring-boot spring-data-jpa

我正在尝试构建一个具有一些基本电子商务功能的小型Spring Boot CRUD应用程序（即添加到购物车等）。我的基本实体是客户，奶酪和角色。

在尝试将顾客映射到奶酪时，只有一个用户可以完美地运作。 A＆＃34;顾客奶酪＆＃34; table是使用customer accountNumber（id）以及Cheese id生成的。这是表格的图片：

MySQL table

但是，在尝试使用其他帐户添加项目时，我收到如下错误：

  

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException：   重复输入＆＃39; 6＆＃39;关键＆＃39; UK_pg95jxw3noahgyna6qwbl3ivd＆＃39;

我假设这只是意味着我只能拥有一个奶酪ID。我试图使用不同的hibernate注释（即@ElementCollection，@ manytomany等），但是无法使其工作。

任何输入都将不胜感激。另外，如果您需要我的任何服务或控制器，请告诉我，但实际添加和删除在我的应用程序中正常工作。

客户 

package com.example.demo.models;

import javax.persistence.*;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

@Entity
public class Customer implements Serializable {

    @NotNull
    @Size(min = 2, max = 25)
    private String name;

    @GeneratedValue
    @Id
    private int accountNumber;

    private BigDecimal accountFunds;

    @NotNull
    @Size(min = 2)
    private String password;

    @NotNull
    @Size(min = 2, max = 25)
    @Email
    private String email;

    @ManyToMany(cascade=CascadeType.ALL)
    @JoinTable(name="user_roles",
            joinColumns={@JoinColumn(name="CUSTOMER_EMAIL", referencedColumnName = "email")},
            inverseJoinColumns={@JoinColumn(name="ROLE_ID", referencedColumnName="id")})
    private List<Role> roles;

    @ElementCollection
    private List<Cheese> cheeses = new ArrayList<>();


    public Customer(String name, String password, String email) {
        this.name = name;
        this.password = password;
        this.email = email;
        this.accountFunds = new BigDecimal(225.00); // default value
    }

    public Customer() {}

    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAccountNumber() {
        return accountNumber;
    }

    public List<Role> getRoles() {
        return roles;
    }

    public void setRoles(List<Role> roles) {
        this.roles = roles;
    }

    public BigDecimal getAccountFunds() {
        return accountFunds;
    }

    public void setAccountFunds(BigDecimal accountFunds) {
        this.accountFunds = accountFunds;
    }

    public List<Cheese> getCheeses() {
        return cheeses;
    }

    public void setCheeses(List<Cheese> cheeses) {
        this.cheeses = cheeses;
    }
}

干酪 

package com.example.demo.models;

import javax.persistence.*;
import javax.validation.constraints.DecimalMax;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

@Entity
public class Cheese {

    @NotNull
    @Size(min=2, max=20)
    private String name;


    @NotNull
    @Size(min=2, max=20)
    private String description;

    @NotNull
    @DecimalMax("10000.0") @DecimalMin("0.0")
    private BigDecimal price;

    @Id
    @GeneratedValue
    private int id;

    @ManyToMany
    private List<Customer> customers = new ArrayList<>();

    public Cheese() {}

    public Cheese(String name, String description, BigDecimal price) {
        this.name = name;
        this.description = description;
        this.price = price;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

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

    public String getDescription() {
        return description;
    }

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

}

1 个答案:

答案 0 :(得分：0)

嗯...所以，我通过以下方式让它工作：我将电子邮件更改为customer_id，这无疑应该没有什么区别。对于奶酪类，我做了很多很多的“mapBy”奶酪。

同样，我不确定为什么会这样，而另一个则不然，但似乎就是这种情况。

<强>客户 

package com.example.demo.models;

import javax.persistence.*;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

@Entity
public class Customer implements Serializable {

@NotNull
@Size(min = 2, max = 25)
private String name;

@GeneratedValue
@Id
private int accountNumber;

private BigDecimal accountFunds;

@NotNull
@Size(min = 2)
private String password;

@NotNull
@Size(min = 2, max = 25)
@Email
private String email;

@ManyToMany(cascade=CascadeType.ALL)
@JoinTable(name="user_roles",
        joinColumns={@JoinColumn(name="CUSTOMER_EMAIL", referencedColumnName = "email")},
        inverseJoinColumns={@JoinColumn(name="ROLE_ID", referencedColumnName="id")})
private List<Role> roles;

//@ElementCollection

@ManyToMany(cascade=CascadeType.ALL)
@JoinTable(name="cheese_customers",
        joinColumns={@JoinColumn(name="CUSTOMER_ID", referencedColumnName = "accountNumber")},
        inverseJoinColumns={@JoinColumn(name="PRODUCT_ID", referencedColumnName="id")})
private List<Cheese> cheeses = new ArrayList<>();


public Customer(String name, String password, String email) {
    this.name = name;
    this.password = password;
    this.email = email;
    this.accountFunds = new BigDecimal(225.00);
}

public Customer() {}

public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public int getAccountNumber() {
    return accountNumber;
}

public List<Role> getRoles() {
    return roles;
}

public void setRoles(List<Role> roles) {
    this.roles = roles;
}

public BigDecimal getAccountFunds() {
    return accountFunds;
}

public void setAccountFunds(BigDecimal accountFunds) {
    this.accountFunds = accountFunds;
}

public List<Cheese> getCheeses() {
    return cheeses;
}

public void setCheeses(List<Cheese> cheeses) {
    this.cheeses = cheeses;
}
}

<强>干酪 

package com.example.demo.models;

import javax.persistence.*;
import javax.validation.constraints.DecimalMax;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

@Entity
public class Cheese {

    @NotNull
    @Size(min=2, max=20)
    private String name;


    @NotNull
    @Size(min=2, max=20)
    private String description;

    @NotNull
    @DecimalMax("10000.0") @DecimalMin("0.0")
    private BigDecimal price;

    @Id
    @GeneratedValue
    private int id;


    @ManyToMany(mappedBy = "cheeses")
    private List<Customer> customers = new ArrayList<>();

    public Cheese() {}

    public Cheese(String name, String description, BigDecimal price) {
        this.name = name;
        this.description = description;
        this.price = price;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

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

    public String getDescription() {
        return description;
    }

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