JPA(Hibernate)和自定义表前缀

Question

是否可以覆盖JPA/Hibernate中的表名,以便为所有项目实体添加公共前缀？例如,能够通过"JBPM5_"前缀为所有JBPM 5表添加前缀.

接受答案的示例:

public class JBPM5NamingStrategy extends ImprovedNamingStrategy {
   public String classToTableName(String className) {
      return StringHelper.unqualify(className);
   }
   public String propertyToColumnName(String propertyName) {
      return propertyName;
   }
   public String tableName(String tableName) {
      return "JBPM5_" + tableName;
   }
   public String columnName(String columnName) {
      return columnName;
   }
   public String propertyToTableName(String className, String propertyName) {
      return "JBPM5_" + classToTableName(className) + '_'
         + propertyToColumnName(propertyName);
   }
}

Answer 1

一次重命名所有表的一种方法是实现自己的namingStrategy(实现org.hibernate.cfg.NamingStrategy).

使用的NamingStrategy在persistence.xml中指定

<property name="hibernate.ejb.naming_strategy"
          value="com.example.MyNamingStrategy" />

Answer 2

使用NamingStrategy.我之前的答案应该提供您所需要的.

从以前的答案复制:

下面是一个示例NamingStrategy,它为连接表构建TYPE1_TYPE2形式的表名,并为所有表添加一个公共前缀:

public class CustomNamingStrategy extends ImprovedNamingStrategy {

    private static final long serialVersionUID = 1L;
    private static final String PREFIX = "PFX_";

    @Override
    public String classToTableName(final String className) {
        return this.addPrefix(super.classToTableName(className));
    }

    @Override
    public String collectionTableName(final String ownerEntity,
            final String ownerEntityTable, final String associatedEntity,
            final String associatedEntityTable, final String propertyName) {
        return this.addPrefix(super.collectionTableName(ownerEntity,
                ownerEntityTable, associatedEntity, associatedEntityTable,
                propertyName));
    }

    @Override
    public String logicalCollectionTableName(final String tableName,
            final String ownerEntityTable, final String associatedEntityTable,
            final String propertyName) {
        return this.addPrefix(super.logicalCollectionTableName(tableName,
                ownerEntityTable, associatedEntityTable, propertyName));
    }

    private String addPrefix(final String composedTableName) {

        return PREFIX
                + composedTableName.toUpperCase().replace("_", "");

    }

}

Answer 3

在Hibernate 5中,您仍然需要自己实现此行为.但是,现在存在隐式和物理命名策略.

这是使用Hibernate 5为表名添加前缀的示例性实现:

package my.app;

import org.hibernate.boot.model.naming.Identifier;
import org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;

public class PrefixPhysicalNamingStrategy extends PhysicalNamingStrategyStandardImpl {

    /**
     * TODO Make this an injectable application property
     */
    public static final String TABLE_NAME_PREFIX = "MY_PREFIX_";

    @Override
    public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment context) {
        Identifier newIdentifier = new Identifier(TABLE_NAME_PREFIX + name.getText(), name.isQuoted());
        return super.toPhysicalTableName(newIdentifier, context);
    }
}

使用Spring Boot 2的此配置属性来激活物理命名策略:

spring.jpa.hibernate.naming.physical-strategy: my.app.PrefixPhysicalNamingStrategy