java - Hibernate 无法创建表：org.hibernate.tool.schema.spi.CommandAcceptanceException: Error execution DDL "create table PSQLException

问题描述

我有 5 个实体：Field、Game、Move、Player 和 User。一个游戏有两个玩家，一个玩家只与一个游戏相关联；一个用户关联多个玩家，一个玩家可以出很多招，而每招只能有一个玩家；一个游戏有两个玩家，许多动作和许多领域。

Hibernate 为其中的 4 个创建表和约束，没有任何问题。但是，当它尝试为 Move 实体创建表时，会引发异常：

org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "create table moves (id int4 not null, column int4 not null, row int4 not null, game_id int4, player_id int4, primary key (id))" via JDBC Statement

然后稍后

org.hibernate.tool.schema.internal.ExceptionHandlerLoggedImpl handleException
WARN: GenerationTarget encountered exception accepting command : Error executing DDL "alter table moves add constraint FKjv33kkwwhe6121266nmuk7y1d foreign key (game_id) references games" via JDBC Statement
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "alter table moves add constraint FKjv33kkwwhe6121266nmuk7y1d foreign key (game_id) references games" via JDBC Statement

几次。

我不明白 Move 实体有什么问题。这是我的代码：

领域：

package noughtsandcrosses.entity;

import javax.persistence.*;

@Entity
@Table(name = "fields")
public class Field {
    @Id
    @GeneratedValue
    private int id;

    private int[][] field;

    @ManyToOne
    @JoinColumn(name = "game_id")
    private Game game;

    public void update(Move move)  {

    }

    public int getId() {
        return id;
    }

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

    public int[][] getField() {
        return field;
    }

    public void setField(int[][] field) {
        this.field = field;
    }

    public Game getGame() {
        return game;
    }

    public void setGame(Game game) {
        this.game = game;
    }
}

游戏：

package noughtsandcrosses.entity;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

@Entity
@Table(name = "games")
public class Game {
    @Id @GeneratedValue
    private int id;

    @OneToOne
    @JoinColumn(name = "crosses_player_id")
    private Player crossesPlayer;
    @OneToOne
    @JoinColumn(name = "noughts_player_id")
    private Player noughtsPlayer;

    @OneToMany(mappedBy = "game")
    private List<Move> moves;

    @OneToMany(mappedBy = "game")
    private List<Field> fields;

    public Game(Player crossesPlayer, Player noughtsPlayer) {
        this.crossesPlayer = crossesPlayer;
        this.noughtsPlayer = noughtsPlayer;
    }


    public Player getCrossesPlayer() {
        return crossesPlayer;
    }

    public void setCrossesPlayer(Player crossesPlayer) {
        this.crossesPlayer = crossesPlayer;
    }

    public Player getNoughtsPlayer() {
        return noughtsPlayer;
    }

    public void setNoughtsPlayer(Player noughtsPlayer) {
        this.noughtsPlayer = noughtsPlayer;
    }

    public List<Move> getMoves() {
        return moves;
    }

    public void setMoves(List<Move> moves) {
        this.moves = moves;
    }

    public List<Field> getFields() {
        return fields;
    }

    public void setFields(List<Field> fields) {
        this.fields = fields;
    }

    public int getId() {
        return id;
    }

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

移动：

package noughtsandcrosses.entity;

import javax.persistence.*;

@Entity
@Table(name = "moves")
public class Move {
    @Id
    @GeneratedValue
    private int id;

    @ManyToOne
    @JoinColumn(name = "player_id")
    private Player player;

    @ManyToOne
    @JoinColumn(name = "game_id")
    private Game game;

    private int row;
    private int column;

    public Move()  {}

    public Move(Player player, int row, int column) {
        this.player = player;
        this.row = row;
        this.column = column;
    }

    public Player getPlayer() {
        return player;
    }

    public int getRow() {
        return row;
    }

    public int getColumn() {
        return column;
    }

    public int getId() {
        return id;
    }

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

    public void setPlayer(Player player) {
        this.player = player;
    }

    public void setRow(int row) {
        this.row = row;
    }

    public void setColumn(int column) {
        this.column = column;
    }

    public Game getGame() {
        return game;
    }

    public void setGame(Game game) {
        this.game = game;
    }
}

播放器：

package noughtsandcrosses.entity;

import javax.persistence.*;
import java.util.List;

@Entity
@Table(name = "players")
public class Player {
    @Id @GeneratedValue
    private int id;

    private enum Alignment {
        NOUGHTS, CROSSES
    };
    private Alignment alignment;

    @ManyToOne
    private User user;

    @OneToMany(mappedBy = "player")
    private List<Move> moves;

    public Player() {

    }

    public int getId() {
        return id;
    }

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

    public Alignment getAlignment() {
        return alignment;
    }

    public void setAlignment(Alignment alignment) {
        this.alignment = alignment;
    }

    public User getUser() {
        return user;
    }

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

    public List<Move> getMoves() {
        return moves;
    }

    public void setMoves(List<Move> moves) {
        this.moves = moves;
    }
}

用户：

package noughtsandcrosses.entity;

import javax.persistence.*;
import java.util.*;

@Entity
@Table(name = "users")
@Inheritance(strategy = InheritanceType.JOINED)
public class User {
    @Id
    @GeneratedValue
    private int id;

    private String username;
    private String password;

    @OneToMany(mappedBy="user")
    private List<Player> players;

    public User()  {}

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public User(String username)  {
        this.username = username;
    }

    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 getId() {
        return id;
    }

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

    public List<Player> getPlayers() {
        return players;
    }

    public void setPlayers(List<Player> players) {
        this.players = players;
    }
}

标签： javapostgresqlhibernatejpahibernate-mapping

Hibernate 应该给你一个真正的错误信息，而不仅仅是告诉你哪个命令失败了。不这样做吗？Hibernate 非常流行（但不是我个人），所以我怀疑它会被破坏到无法返回真正的错误消息，所以我认为您只是没有正确阅读它们。无论如何，您可以查看 PostgreSQL 的日志文件以找到真正的错误消息

如果我从您显示的消息中获取语句并在 psql 中运行它，我会得到：

create table moves (id int4 not null, column int4 not null, row int4 not null, game_id int4, player_id int4, primary key (id));
ERROR:  syntax error at or near "column"

这里的问题是这column是 PostgreSQL 中的保留字。您不能将其用作列的名称，除非您将其放在双引号中。我不知道如何告诉休眠将它放在双引号中，但我确信有办法。但最好将其命名为board_column. row不是 PostgreSQL 中的完全保留字，所以你可以使用它，但我不会这样做。将其重命名为board_row.

java - Hibernate 无法创建表：org.hibernate.tool.schema.spi.CommandAcceptanceException: Error execution DDL "create table PSQLException

问题描述

解决方案

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