Question

在我的Java应用程序中，我正在使用以下枚举：

@ElementCollection
@Enumerated(EnumType.ORDINAL)
protected Set<Tag> tags = new TreeSet<>();

然而，这个定义在@MappedSuperClass中给出，因此我不能在name中定义@JoinTable，因为名称会在子类中发生冲突。我的问题是忽略了默认的hibernate命名策略。例如，对于继承的类Event而不是名为event_tags的表，hibernate尝试使用Event_tags而不是字段event_id，它尝试使用Event_id }。在我看来，Hibernate完全忽略了命名策略，只是使用实体名称而没有任何改变。

如何强制它使用默认命名策略？

Answer 1

似乎默认的命名策略无法处理这些，您需要实现自己的命名策略。例如：

public class NamingPolicy implements NamingStrategy, Serializable {

    @Override
    public String classToTableName(String className) {
        return StringHelper.unqualify(className).toLowerCase();
    }



    @Override
    public String propertyToColumnName(String propertyName) {
        return StringHelper.unqualify(propertyName);
    }



    public String singularize(String propertyName) {
        if (propertyName != null && propertyName.endsWith("s")) {
            propertyName = propertyName.substring(0, propertyName.length() - 1);
        }

        return propertyName;
    }



    @Override
    public String tableName(String tableName) {
        return tableName;
    }



    @Override
    public String columnName(String columnName) {
        return columnName;
    }



    @Override
    public String collectionTableName(
            String ownerEntity, String ownerEntityTable, String associatedEntity,
            String associatedEntityTable, String propertyName) {

        return classToTableName(ownerEntityTable) + "_" + 
                or(associatedEntityTable, singularize(propertyName));
    }



    @Override
    public String joinKeyColumnName(String joinedColumn, String joinedTable) {
        return columnName(joinedColumn);
    }



    @Override
    public String foreignKeyColumnName(
            String propertyName, String propertyEntityName,
            String propertyTableName, String referencedColumnName) {

        String header = propertyName != null ? propertyName : propertyTableName;
        if (header == null) {
            throw new AssertionFailure("NamingStrategy not properly filled");
        }

        return classToTableName(header) + "_" + referencedColumnName;
    }



    @Override
    public String logicalColumnName(String columnName, String propertyName) {
        return StringHelper.isNotEmpty(columnName)
                ? columnName : StringHelper.unqualify(propertyName);
    }



    @Override
    public String logicalCollectionTableName(
            String tableName, String ownerEntityTable, String associatedEntityTable, String propertyName) {


        if (tableName != null) {
            return tableName;
        } else {
            return tableName(ownerEntityTable) + "_" + (associatedEntityTable != null
                    ? associatedEntityTable
                    : singularize(propertyName));
        }
    }



    @Override
    public String logicalCollectionColumnName(
            String columnName, String propertyName, String referencedColumn) {
        return StringHelper.isNotEmpty(columnName)
                ? columnName
                : classToTableName(propertyName) + "_" + singularize(referencedColumn);
    }
}

@Enumerated @ElementCollection的命名策略

1 个答案: