hbm2ddl

问题 I have an enterprise application that uses a single database, but the application needs to support mysql , oracle , and sql*server as installation options. To try to remain portable we are using JPA annotations with Hibernate as the implementation. We also have a test-bed instance of each database running for development. The app is building nicely in Maven and I've played around with the hibernate3-maven-plugin and can auto-generate DDL for a given database dialect. What is the best way to

问题 I'm using hibernate annotations and i want to export my database schema. Similar to the schemaexporttask with hbm xml files. 回答1: Indeed, the original Hibernate Core SchemaExportTask can only handle Hibernate XML mapping files, not annotations. What you need is the HibernateToolTask that comes with Hibernate Tools. Here is an Usage example adapted from Java Persistence With Hibernate: <taskdef name="hibernatetool" classname="org.hibernate.tool.ant.HibernateToolTask" classpathref="project

问题 hi my tables are as follows: 1- medical_company : medical_company_id foreign key on account_entity table account_entity_id column (not a pk) column1 column2 column3 2- account_entity : account_entity_id (pk) column1 column2 column3 3- person: person_id (pk) column1 column2 column3 4- employee_company: company_id foreign key on medical_company table on medical_company_id employee_id foreign key on person table on person_id column1 column2 ENTITIES: 1- MedicalCompany: @SuppressWarnings("serial"

问题 I have updated to a newer version of hibernate3-maven-plugin. I get the following error trying to use the plugin mentioned below. Would appreciate any pointers in resolving this issue. <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>hibernate3-maven-plugin</artifactId> <version>3.0</version> <executions> <execution> <id>create sql schema</id> <phase>process-test-resources</phase> <goals> <goal>hbm2ddl</goal> </goals> <configuration> <componentProperties> <persistenceunit>${app

问题 I am looking at the Hibernate hbm2ddl.auto configuration property and its possible values: validate update create create-drop What do all these values do? The Hibernate Reference Documentation only talks briefly about create-drop , but doesn't say anything about the other values: hibernate.hbm2ddl.auto Automatically validates or exports schema DDL to the database when the SessionFactory is created. With create-drop , the database schema will be dropped when the SessionFactory is closed

问题 I want to create database schema in hibernate first time. And further, if there is any modification in the schema, like addition of a new table or deletion of some column, I want to update the existing schema keeping the previous data intact. As per options given at this question, it looks like either I can create schema destroying the previous data, or I can update the schema. Is there any value which can do both? 回答1: Actually I just checked <property name="hibernate.hbm2ddl.auto" value=

问题 I want to create database schema in hibernate first time. And further, if there is any modification in the schema, like addition of a new table or deletion of some column, I want to update the existing schema keeping the previous data intact. As per options given at this question, it looks like either I can create schema destroying the previous data, or I can update the schema. Is there any value which can do both? 回答1: Actually I just checked <property name="hibernate.hbm2ddl.auto" value=

问题 I use: EJB3 / JPA (Hibernate) MySQL 5 I have to set up a system to help database migrations. Tried to use LiquiBase but it seems not enough mature yet to be used with Hibernate. What I would like to do is: I have version 1.0 of the application in production I have version 2.0 of the application developed and tested I want to update the application database in production without losing data Actually I would like to use the new persistence.xml and the production database to be able to generate

问题 I've been using hbm2ddl=update for Database creations until now. But right now we're going to remove the hbm2ddl property and use SchemaExport tool of Hibernate to create sql statement based on the Hibernate Annotated model classes. SchemaExport is also completed right now. But when I'm making sure that hibernate generated database and SchemeExport generated schema sql are same by using mysqldiff tool on two databases (hibernate generated & SchemaExport generated), there are few columns which

问题 I (after a while without touching JPA) started a project with Hibernate 4.1, JPA2 and Spring. It is a maven project with a common life cycle. Upon running mvn test I get the expected result of not finding the required database objects (connection is successful as expected). All my researches and experiments, however, proved not enough to make something that seemed to be a common situation. I expect to be able to have maven drop/create the schema the local development database while executing