superset详解(六)--添加/编辑表

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本文详细介绍了在Superset平台上添加和编辑表的过程。在添加表时，通过TableModelView的post_add()函数自动获取表的基本信息并展示其列和指标。编辑表后，将直接跳转至数据查询页面，简化配置流程。

添加表

我们在superset上添加表之后，表的列和指标就自动展示出来了，这个主要是在tablemodelview的post_add()函数中做的操作。

class TableModelView(DatasourceModelView, DeleteMixin, YamlExportMixin):  # noqa
    datamodel = SQLAInterface(models.SqlaTable)
    pass
   
   def post_add(self, table, flash_message=True):
	    table.fetch_metadata()             # 主要是这个函数获取表的基本信息
	    security_manager.merge_perm('datasource_access', table.get_perm())
	    if table.schema:
	        security_manager.merge_perm('schema_access', table.schema_perm)
	
	    if flash_message:
	        flash(_(
	            'The table was created. '
	            'As part of this two phase configuration '
	            'process, you should now click the edit button by '
	            'the new table to configure it.'), 'info')

    def fetch_metadata(self):
        """Fetches the metadata for the table and merges it in"""
        try:
            table = self.get_sqla_table_object()
        except Exception:
            raise Exception(_(
                "Table [{}] doesn't seem to exist in the specified database, "
                "couldn't fetch column information").format(self.table_name))

        M = SqlMetric  # noqa
        metrics = []
        any_date_col = None
        db_dialect = self.database.get_dialect()
        #获取mysql的comment信息
        comment_info_dict=self.init_table(table)
        dbcols = (
            db.session.query(TableColumn)
            .filter(TableColumn.table == self)
            .filter(or_(TableColumn.column_name == col.name
                        for col in table.columns)))
        dbcols = {dbcol.column_name: dbcol for dbcol in dbcols}
        count=0
        for col in table.columns:
            try:
                datatype = col.type.compile(dialect=db_dialect).upper()
            except Exception as e:
                datatype = 'UNKNOWN'
                logging.error(
                    'Unrecognized data type in {}.{}'.format(table, col.name))
                logging.exception(e)
            dbcol = dbcols.get(col.name, None)
            if not dbcol:
                dbcol = TableColumn(column_name=col.name, type=datatype)
                dbcol.groupby = dbcol.is_string
                dbcol.filterable = dbcol.is_string
                dbcol.sum = dbcol.is_num
                #dbcol.avg = dbcol.is_num
                dbcol.is_dttm = dbcol.is_time
                dbcol.order_number=count*100
                count+=1
                if comment_info_dict:
                    dbcol.verbose_name=comment_info_dict[dbcol.column_name]
            else:
                dbcol.type = datatype
            self.columns.append(dbcol)
            if not any_date_col and dbcol.is_time:
                any_date_col = col.name
            metrics += dbcol.get_metrics().values()

        metrics.append(M(
            metric_name='count',
            verbose_name='COUNT(*)',
            metric_type='count',
            expression='COUNT(*)',
        ))
        if not self.main_dttm_col:
            self.main_dttm_col = any_date_col
        self.add_missing_metrics(metrics)
        db.session.merge(self)
        db.session.commit()

如果表的信息更新了，可以使用Refresh Metadata 来更新表的内容。

编辑表

编辑表之后在页面跳转到数据查询页面

@expose('/edit/<pk>', methods=['GET', 'POST'])
@has_access
 def edit(self, pk):
     """Simple hack to redirect to explore view after saving"""
     resp = super(TableModelView, self).edit(pk)
     if isinstance(resp, basestring):
         return resp
     return redirect('/superset/explore/table/{}/'.format(pk))   # 页面跳转