使用hibernate自动创建Mysql表失败原因

Posted 2020-08-20

1.使用 schemaExport(hibernate5.2.3)创建mysql表 

@Test
    public void testSchemaExport() {

        ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().configure().build();
        Metadata metadata = new MetadataSources(serviceRegistry).buildMetadata();
        SchemaExport schemaExport = new SchemaExport();
        schemaExport.create(EnumSet.of(TargetType.DATABASE), metadata);

    }

2.使用上面的代码可以生成SQL但是建表别没有成功;

Hibernate: 
    create table User (
        id integer not null,
        age integer,
        name varchar(255),
        primary key (id)
    ) type=InnoDB

把hibernate生成的SQL语句在Navicat中执行出现错误;

[Err] 1064 - 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 ‘Hibernate: 
    create table User (
        id integer not null,
        age ‘ at line 1

3.经过查找发现是hibernate里的dialect和Mysql的版本不匹配,SQL语句里的type=InnoDB使用在MySQL5.0之前，5.0之后就要是使用engine=InnoDB

MySql5.0之前的配置

 <property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>

5.0之后需要使用

<property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>

4.修改后的hibernate生成SQL语句如下，建表成功；

Hibernate: 
    create table User (
        id integer not null,
        age integer,
        name varchar(255),
        primary key (id)
    ) ENGINE=InnoDB