Pandas直接读取sql脚本的方法

from io import StringIO
import pandas as pd
import re

def read_sql_script_all(sql_file_path, quotechar="'") -> (str, dict):
  insert_check = re.compile(r"insert +into +`?(\w+?)`?\(", re.I | re.A)
  with open(sql_file_path, encoding="utf-8") as f:
    sql_txt = f.read()
  end_pos = -1
  df_dict = {}
  while True:
    match_obj = insert_check.search(sql_txt, end_pos+1)
    if not match_obj:
      break
    table_name = match_obj.group(1)
    start_pos = match_obj.span()[1]+1
    end_pos = sql_txt.find(";", start_pos)
    tmp = re.sub(r"\)( values |,)\(", "\n", sql_txt[start_pos:end_pos])
    tmp = re.sub(r"[`()]", "", tmp)
    df = pd.read_csv(StringIO(tmp), quotechar=quotechar)
    dfs = df_dict.setdefault(table_name, [])
    dfs.append(df)
  for table_name, dfs in df_dict.items():
    df_dict[table_name] = pd.concat(dfs)
  return df_dict

df_dict = read_sql_script_all("D:/tmp/test.sql")
df = df_dict['index_test']
df.head(10)

def read_sql_script_by_tablename(sql_file_path, table_name, quotechar="'") -> (str, dict):
  insert_check = re.compile(r"insert +into +`?(\w+?)`?\(", re.I | re.A)
  with open(sql_file_path, encoding="utf-8") as f:
    sql_txt = f.read()
  end_pos = -1
  dfs = []
  while True:
    match_obj = insert_check.search(sql_txt, end_pos+1)
    if not match_obj:
      break
    start_pos = match_obj.span()[1]+1
    end_pos = sql_txt.find(";", start_pos)
    if table_name != match_obj.group(1):
      continue
    tmp = re.sub(r"\)( values |,)\(", "\n", sql_txt[start_pos:end_pos])
    tmp = re.sub(r"[`()]", "", tmp)
    df = pd.read_csv(StringIO(tmp), quotechar=quotechar)
    dfs.append(df)
  return pd.concat(dfs)

df = read_sql_script_by_tablename("D:/tmp/test.sql", "index_test")
df.head()

from sqlalchemy import create_engine
import pandas as pd
import re


def load_sql2sqlite_conn(sqltxt_path):
  create_rule = re.compile("create +table [^;]+;", re.I)
  insert_rule = re.compile("insert +into [^;]+;", re.I)
  with open(sqltxt_path, encoding="utf-8") as f:
    sqltxt = f.read()
  engine = create_engine('sqlite:///:memory:')
  pos = -1
  while True:
    match_obj = create_rule.search(sqltxt, pos+1)
    if match_obj:
      pos = match_obj.span()[1]
      sql = match_obj.group(0).replace("AUTO_INCREMENT", "")
      sql = re.sub("\).+;", ");", sql)
      engine.execute(sql)
    match_obj = insert_rule.search(sqltxt, pos+1)
    if match_obj:
      pos = match_obj.span()[1]
      sql = match_obj.group(0)
      engine.execute(sql)
    else:
      break
  tablenames = [t[0] for t in engine.execute(
    "SELECT tbl_name FROM sqlite_master WHERE type='table';").fetchall()]
  return tablenames, engine.connect()

tablenames, conn = load_sql2sqlite_conn("D:/tmp/test.sql")
tablename = tablenames[0]
print(tablename)
df = pd.read_sql(f"select * from {tablename};", conn)
df