gctools/database/db_create.py

import json
from collections import namedtuple
from pathlib import Path
import pandas as pd
import pyodbc

# from re import escape
# from numpy import select
# from dataclasses import dataclass


DbCreateConfig = namedtuple(
    "DbCreateConfig",
    "name csv_file clients filter source_dsn target_dsn stage_dir batch_dir",
)
DsnConfig = namedtuple("DsnConfig", "user password server database driver schema")

cfg = DbCreateConfig(
    **{
        "name": "CARLO",
        "csv_file": "CARLO.csv",
        "clients": {"1": "M und S Fahrzeughandel GmbH"},
        "filter": ["01.01.2018", "01.01.2019"],
        "source_dsn": {
            "user": "sa",
            "password": "Mffu3011#",
            "server": "GC-SERVER1\\GLOBALCUBE",
            "database": "DE0017",
            "driver": "mssql",
            "schema": "dbo",
        },
        "target_dsn": {
            "user": "sa",
            "password": "Mffu3011#",
            "server": "GC-SERVER1\\GLOBALCUBE",
            "database": "CARLO2",
            "driver": "mssql",
            "schema": "import",
        },
        "stage_dir": "..\\temp",
        "batch_dir": "..\\batch",
    }
)


class database_inspect:
    tables = []

    def __init__(self, dsn):
        self.dsn = DsnConfig(**dsn)
        self.cursor = self.connect()

    def conn_string(self):
        if self.dsn.driver == "mssql":
            return (
                "Driver={SQL Server Native Client 11.0};"
                + f"Server={self.dsn.server};Database={self.dsn.database};Uid={self.dsn.user};Pwd={self.dsn.password}"
            )
        if self.dsn.driver == "mysql":
            return f"mysql+pymysql://{self.dsn.user}:{self.dsn.password}@{self.dsn.server}/{self.dsn.database}?charset=utf8mb4"
        return f"DSN={self.dsn.server};UID={self.dsn.user};PWD={self.dsn.password}"

    def bcp_conn_params(self):
        return f"-S {self.dsn.server} -d {self.dsn.database} -U {self.dsn.user} -P {self.dsn.password}"

    def connect(self):
        c = pyodbc.connect(self.conn_string())
        return c.cursor()

    def get_tables(self):
        tables = [x[2] for x in self.cursor.tables(tableType="TABLE")]
        views = [x[2] for x in self.cursor.tables(tableType="VIEW")]
        self.tables = tables + views
        return self.tables

    def get_prefix(self):
        if (len(self.tables)) == 0:
            self.get_tables()
        source_tables_prefix = dict(
            enumerate(
                sorted(list(set([t.split("$")[0] for t in self.tables if "$" in t]))), 1
            )
        )
        if len(source_tables_prefix) == 0:
            q = self.cursor.execute("select name FROM sys.databases")
            source_tables_prefix = [x[0] for x in q.fetchall()]
        return source_tables_prefix

    def get_columns(self, table):
        source_insp_cols = [col.column_name for col in self.cursor.columns(table=table)]
        if len(source_insp_cols) == 0:
            q = self.cursor.execute(
                "SELECT COLUMN_NAME as column_name FROM information_schema.columns "
                + f"WHERE TABLE_NAME = '{self.convert_table(table)}'"
            )
            source_insp_cols = [col[0] for col in q.fetchall()]
        return source_insp_cols

    def convert_table(self, table):
        if "." in table:
            table = table.split(".")[-1]
        if "[" in table:
            table = table[1:-1]
        return table


def create(config_file="dbtools/OPTIMA.json"):
    cfg_import = json.load(open(config_file, "r", encoding="latin-1"))
    base_dir = Path(config_file).resolve().parent
    cfg_import["name"] = Path(config_file).stem
    if cfg_import["stage_dir"][:2] == "..":
        cfg_import["stage_dir"] = str(
            base_dir.joinpath(cfg_import["stage_dir"]).resolve()
        )
    if cfg_import["batch_dir"][:2] == "..":
        cfg_import["batch_dir"] = str(
            base_dir.joinpath(cfg_import["batch_dir"]).resolve()
        )
    cfg = DbCreateConfig(**cfg_import)

    df = pd.read_csv(f"{base_dir}/{cfg.csv_file}", sep=";", encoding="latin-1")
    config = df[df["target"].notnull()]
    print(config.head())

    source_db = database_inspect(cfg.source_dsn)
    source_tables = source_db.get_tables()
    print(source_db.get_prefix())

    target_db = database_inspect(cfg.target_dsn)
    target_tables = target_db.get_tables()

    for index, current_table in config.iterrows():
        with open(
            f"{cfg.batch_dir}/{current_table['target']}.bat", "w", encoding="cp850"
        ) as f:
            f.write("@echo off \n")
            f.write("rem ==" + current_table["target"] + "==\n")

            if not current_table["target"] in target_tables:
                f.write(
                    f"echo Ziel-Tabelle '{current_table['target']}' existiert nicht!\n"
                )
                print(f"Ziel-Tabelle '{current_table['target']}' existiert nicht!")
                continue

            f.write(
                f"del {cfg.stage_dir}\\{current_table['target']}*.* /Q /F >nul 2>nul \n"
            )
            f.write(
                f"sqlcmd.exe {target_db.bcp_conn_params()} -p "
                + f"-Q \"TRUNCATE TABLE [{cfg.target_dsn['schema']}].[{current_table['target']}]\" \n"
            )

            target_columns_list = target_db.get_columns(current_table["target"])
            if "CLIENT_DB" in target_columns_list:
                target_columns_list.remove("CLIENT_DB")
                target_columns_list.append("Client_DB")
            target_columns = set(target_columns_list)

            for client_db, prefix in cfg.clients.items():
                source_table = current_table["source"].format(prefix)
                if source_table not in source_tables:
                    source_table2 = source_db.convert_table(source_table)
                    if source_table2 not in source_tables:
                        f.write(
                            f"echo Quell-Tabelle '{source_table}' existiert nicht!\n"
                        )
                        print(f"Quell-Tabelle '{source_table}' existiert nicht!")
                        continue

                source_columns = set(source_db.get_columns(source_table))

                intersect = source_columns.intersection(target_columns)
                # print("Auf beiden Seiten: " + ";".join(intersect))
                diff1 = source_columns.difference(target_columns)
                if len(diff1) > 0:
                    f.write("rem Nur in Quelle: " + ";".join(diff1) + "\n")
                diff2 = target_columns.difference(source_columns)
                if "Client_DB" not in diff2:
                    f.write("echo Spalte 'Client_DB' fehlt!\n")
                    print(
                        f"Ziel-Tabelle '{current_table['target']}' Spalte 'Client_DB' fehlt!"
                    )
                    continue
                diff2.remove("Client_DB")
                if len(diff2) > 0:
                    f.write("rem Nur in Ziel:   " + ";".join(diff2) + "\n")

                if not pd.isnull(current_table["query"]):
                    select_query = current_table["query"].format(
                        prefix, cfg.filter[0], cfg.filter[1]
                    )
                elif "." in source_table or cfg.source_dsn["schema"] == "":
                    select_query = f'SELECT T1.* FROM \\"{source_table}\\" T1 '
                else:
                    select_query = f"SELECT T1.* FROM [{cfg.source_dsn['schema']}].[{source_table}] T1 "

                if not pd.isnull(current_table["filter"]):
                    select_query += " WHERE " + current_table["filter"].format(
                        "", cfg.filter[0], cfg.filter[1]
                    )
                # select_columns = "T1.[" + "], T1.[".join(intersect) + "],"
                select_columns = ""
                for col in target_columns_list:
                    if col in intersect:
                        select_columns += f"T1.[{col}], "
                    elif col == "Client_DB":
                        select_columns += "'" + client_db + '\' as \\"Client_DB\\", '
                    else:
                        select_columns += "'' as \\\"" + col + '\\", '

                select_query = select_query.replace("T1.*", select_columns[:-2])
                select_query = select_query.replace("%", "%%")  # batch-Problem

                stage_csv = (
                    f"{cfg.stage_dir}\\{current_table['target']}_{client_db}.csv"
                )
                # insert_query = f"LOAD DATA INFILE '{stage_csv}' INTO TABLE {current_table['target']} FIELDS TERMINATED BY ','
                # ENCLOSED BY '\"' LINES TERMINATED BY '\n';"

                # print(select_query)
                bulk_copy = "bcp" if cfg.source_dsn["driver"] == "mssql" else "cet"
                f.write(
                    f'{bulk_copy} "{select_query}" queryout "{stage_csv}" {source_db.bcp_conn_params()} -c -C 65001 -m 1000 '
                    + f'-e "{stage_csv[:-4]}.queryout.log" > "{stage_csv[:-4]}.bcp1.log" \n'
                )
                f.write(f'type "{stage_csv[:-4]}.bcp1.log" | findstr -v "1000" \n')
                f.write(
                    f"bcp [{cfg.target_dsn['schema']}].[{current_table['target']}] in \"{stage_csv}\" {target_db.bcp_conn_params()} "
                    + f'-c -C 65001 -m 1000 -e "{stage_csv[:-4]}.in.log" > "{stage_csv[:-4]}.bcp2.log" \n'
                )
                f.write(f'type "{stage_csv[:-4]}.bcp2.log" | findstr -v "1000" \n')

                f.write(f'del "{stage_csv}" /F >nul 2>nul \n')

    with open(f"{cfg.batch_dir}/_{cfg.name}.bat", "w", encoding="cp850") as f:
        f.write("@echo off & cd /d %~dp0 \n")
        f.write(f"del {cfg.stage_dir}\\*.* /Q /F >nul 2>nul \n\n")
        for index, current_table in config.iterrows():
            f.write(f"echo =={current_table['target']}==\n")
            f.write(f"echo {current_table['target']} >CON \n")
            f.write(f"call {current_table['target']}.bat\n\n")


if __name__ == "__main__":
    create()