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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# @Time : 2023/4/8 9:05
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# @Author : old tom
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# @File : metadata_reader.py
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# @Project : futool-tiny-datahub
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# @Desc : 元数据读取
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import abc
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import os
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from configparser import ConfigParser
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from datahub.datasource.datasource_manage import DataSource
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from datahub.metadata.metadatadao.metadata_dao import MetadataDao
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BASE_DIR = os.path.dirname(os.path.abspath(__file__))
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reader_conf = ConfigParser()
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reader_conf.read(os.path.join(BASE_DIR, 'reader_conf.ini'))
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class AbsMetadataReader(metaclass=abc.ABCMeta):
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"""
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抽象元数据读取器
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"""
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def __init__(self, datasource):
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self.datasource = datasource
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@abc.abstractmethod
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def query_tables(self):
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"""
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查询当前连接下所有表
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:return:
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"""
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pass
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@abc.abstractmethod
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def query_views(self):
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"""
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查询当前连接下所有视图
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:return:
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"""
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pass
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@abc.abstractmethod
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def query_procedure(self):
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"""
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查询当前连接下所有存储过程
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:return:
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"""
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pass
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@abc.abstractmethod
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def query_table_fields(self, table):
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"""
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查询字段
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:param table:
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:return:
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"""
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pass
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class MetadataReader(AbsMetadataReader):
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def __init__(self, datasource: DataSource):
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super().__init__(datasource)
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self.db_type = datasource.connector.db_type
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self.dao = MetadataDao(datasource.connector)
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def query_tables(self):
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return self.dao.query_all_tables(reader_conf[self.db_type]['tables'])
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def query_views(self):
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return self.dao.query_all_views(reader_conf[self.db_type]['views'])
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def query_procedure(self):
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return self.dao.query_all_procedure(reader_conf[self.db_type]['procedure'])
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def query_table_fields(self, table):
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return self.dao.query_table_field(reader_conf[self.db_type]['table_field'].replace('#$#', table))
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def query_metadata_detail(self, obj_name, obj_type):
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"""
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查询元数据明细
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例：obj_type 为view或procedure 则查询对应创建语句
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为table 则查询中文注释
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:param obj_name: 对象名称
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:param obj_type: 对象类型
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:return:
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"""
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return {
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'table': self.dao.query_table_field(
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reader_conf[self.db_type][obj_type + '_detail'].replace('#$#', obj_name)),
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'view': self.dao.query_view_detail(obj_name,
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reader_conf[self.db_type][obj_type + '_detail'].replace('#$#',
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obj_name)),
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'procedure': self.dao.query_procedure_detail(
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reader_conf[self.db_type][obj_type + '_detail'].replace('#$#', obj_name))
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}[obj_type]
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