113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
import copy
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from .valid_data import *
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class Sketch:
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def __init__(self, db_client, struct_cache=None):
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self.db_client = db_client
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self.struct_cache = struct_cache
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self.__type_dict = dict()
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self.__struct_dict = dict()
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@property
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def type_dict(self):
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return self.__type_dict
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@property
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def struct_dict(self):
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return self.__struct_dict
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def up_tb_struct(self, db, tb, data):
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struct_dict = self.__struct_dict.get(f'{db}_{tb}', {})
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# 用于类型转换
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type_dict = self.__type_dict.setdefault(f'{db}_{tb}', {})
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for k, v in struct_dict.items():
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type_dict.setdefault(v, set())
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type_dict[v].add(k)
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# 更新结构记录
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if self.struct_cache:
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self.struct_cache.update(db, tb, data)
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def get_tb_struct_cache(self, db, tb):
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"""
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查一条记录 取字段 和类型
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:param db:
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:param tb:
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:return:
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"""
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if self.__struct_dict.get(f'{db}_{tb}'):
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return self.__struct_dict.get(f'{db}_{tb}')
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sql = f'select * from {db}.{tb} limit 1'
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_, columns = self.db_client.execute(sql, with_column_types=True)
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res = {item[0]: item[1] for item in columns}
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self.__struct_dict[f'{db}_{tb}'] = res
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self.up_tb_struct(db, tb, res)
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return res
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def update_user_view(self, db, tb):
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"""
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更新视图
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:param db:
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:param tb:
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:return:
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"""
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if tb != 'user':
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return
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sql = f'drop table if exists {db}.user_view'
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self.db_client.execute(sql)
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sql = f"""create view {db}.user_view as select *
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from {db}.user
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order by `#reg_time` desc
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LIMIT 1 by `#account_id`"""
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self.db_client.execute(sql)
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def alter_table(self, db, tb, data):
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"""
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数据库字段检查
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添加新字段为第一次出现类型
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如果要修改字段类型 存在类型转换问题。停止程序，删除列
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:param db:
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:param tb:
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:param data:
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:return:
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"""
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default_field = self.get_tb_struct_cache(db, tb)
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keys = set(default_field)
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for k, v in data.items():
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if k in ('#type',):
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continue
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if k not in default_field:
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if isinstance(v, str):
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if is_valid_date(v):
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default_field[k] = "Nullable(DateTime('UTC'))"
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else:
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default_field[k] = 'Nullable(String)'
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if isinstance(v, int):
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default_field[k] = 'Nullable(UInt64)'
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if isinstance(v, float):
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default_field[k] = 'Nullable(Float32)'
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if isinstance(v, list):
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default_field[k] = 'Array(String)'
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if isinstance(v, bool):
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default_field[k] = 'Nullable(UInt8)'
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sql = f'alter table {db}.{tb} add column `{k}` {default_field[k]}'
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print(sql)
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try:
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self.db_client.execute(sql)
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except Exception as e:
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print(f'添加字段 {k} 失败')
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default_field.pop(k)
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if tb=='user' and set(default_field) - keys:
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self.up_tb_struct(db, tb, default_field)
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self.update_user_view(db, tb)
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