java - Spring Boot 数据 JPA 和 PostgreSQL 自动生成枚举类型

Question

如果我使用 MySQL，我的实体和枚举将成功创建。

我将数据库更改为 PostgreSQL-9.4 。所以，我有一些错误如下:

... Caused by: org.hibernate.tool.schema.spi.SchemaManagementException: Unable to execute schema management to JDBC target [create table role (id int8 not null, name enum('ADMIN', 'USER', 'SEARCH') not null, primary key (id))] at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:59) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString(SchemaMigratorImpl.java:431) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings(SchemaMigratorImpl.java:420) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.tool.schema.internal.SchemaMigratorImpl.createTable(SchemaMigratorImpl.java:236) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigrationToTargets(SchemaMigratorImpl.java:167) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:60) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:134) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:101) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:472) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:879) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] ... 22 common frames omitted

Caused by: org.postgresql.util.PSQLException: ERROR: type "enum" does not exist Position: 43 at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2455) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2155) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:288) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:430) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:356) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:303) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:289) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:266) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at org.postgresql.jdbc.PgStatement.executeUpdate(PgStatement.java:246) ~[postgresql-9.4.1212.jre7.jar:9.4.1212.jre7] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_191] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_191] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_191] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_191] at org.apache.tomcat.jdbc.pool.StatementFacade$StatementProxy.invoke(StatementFacade.java:114) ~[tomcat-jdbc-8.5.14.jar:na] at com.sun.proxy.$Proxy93.executeUpdate(Unknown Source) ~[na:na] at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:56) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] ... 32 common frames omitted

我的枚举:

public enum RoleType {

    ADMIN("ADMIN"),

    SEARCH("SEARCH"),

    USER("USER");

    private final String value;

    RoleType(final String value) {
        this.value = value;
    }

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

我的角色类别:

@Entity
@Table(name = "role")
public class Role {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonIgnore
    private Long id;

    @NotNull
    @Enumerated(EnumType.STRING)
    @Column(columnDefinition = "enum('ADMIN', 'USER', 'SEARCH')")
    private RoleType name;

    @ManyToMany(mappedBy = "roles")
    @JsonIgnore
    private Set<User> users;

    public Role() {
    }

    public Role(RoleType name) {
        this.name = name;
    }

    public Long getId() {
        return id;
    }

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

    public RoleType getName() {
        return name;
    }

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

    public Set<User> getUsers() {
        return users;
    }

    public void setUsers(Set<User> users) {
        this.users = users;
    }

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

我的 postgresql application.yml 文件:

spring:
  datasource:
    url: jdbc:postgresql://localhost:5432/mydb?autoReconnect=true&useSSL=false
    username: username
    password: password
    driverClassName: org.postgresql.Driver
  jpa:
    hibernate:
      ddl-auto: update
    properties:
      hibernate:
        dialect: org.hibernate.dialect.PostgreSQLDialect

我的 mysql 旧 application.yml 文件:

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/mydb?autoReconnect=true&useSSL=false
    username: user
    password: password
    driverClassName: com.mysql.jdbc.Driver
  jpa:
    hibernate:
      ddl-auto: update

我的pom.xml

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        ...

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
        </dependency>

        <!--dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency-->
        
    </dependencies>

如何将其配置为自动生成枚举类型？

Answer 1

我假设您想从 MySQL 迁移到 PostgreSQL。

使用数据库枚举 PostgreSQL 与 MySQL 不同。

在此处了解有关如何在 PostgreSQL 中创建枚举的更多信息:https://www.postgresql.org/docs/9.1/datatype-enum.html

这意味着您无法使用 JPA/Hibernate 创建枚举。