如何通过 Persistence.generateSchema() 生成 DDL？

Question

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="safety" transaction-type="JTA">
    <jta-data-source>java:/jdbc/MyDataSource</jta-data-source>
    <properties>
      <property name="javax.persistence.schema-generation.scripts.action" value="create"/>
      <property name="javax.persistence.schema-generation.scripts.create-target" value="create.ddl"/>
      <property name="hibernate.default_schema" value="safety"/>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
      <property name="hibernate.show_sql" value="true"/>
      <property name="hibernate.format_sql" value="false"/>
      <property name="hibernate.use_sql_comments" value="true"/>
    </properties>
  </persistence-unit>
</persistence>

这是我的 persistence.xml。如何通过 Persistence.generateSchema() 生成数据库模式？

public class SchemaGenerator {
    public static void main(String args[]) {
        Map<String, Object> properties = new HashMap<String, Object>();
        //adding some properties
        Persistence.generateSchema("safety", properties);
    }
}

它给了我这个错误：org.hibernate.engine.jndi.JndiException: Error parsing JNDI name [java:/jdbc/MyDataSource]。

但是，它不必连接我的数据库，因为我只需要生成 ddl。

Answer 1

您必须将属性connection.provider_class 设置为org.hibernate.service.jdbc.connections.internal.UserSuppliedConnectionProviderImpl。这样他就不会尝试加载 JNDI 源代码。

这是我的generation.properties，我使用 Ant Hibernate Tool 进行离线模式生成：

hibernate.dialect=...
hibernate.connection.provider_class=org.hibernate.service.jdbc.connections.internal.UserSuppliedConnectionProviderImpl
javax.persistence.validation.mode=ddl, callback
hibernate.cache.use_second_level_cache=false
hibernate.cache.use_query_cache=false