数据库：Hive转Presto（四）

这次补充了好几个函数，并且新加了date_sub函数，代码写的比较随意，有的地方比较繁琐，还待改进，而且这种文本处理的东西，经常需要补充先前没考虑到的情况，要经常修改。估计下一篇就可以补充完所有代码。

import re
import os
import tkinter.filedialog
from tkinter import *class Hive2Presto:def __int__(self):self.t_funcs = ['substr', 'nvl', 'substring', 'unix_timestamp'] + \['to_date', 'concat', 'sum', 'avg', 'abs', 'year', 'month', 'ceiling', 'floor']self.time_funcs = ['date_add', 'datediff', 'add_months', 'date_sub']self.funcs = self.t_funcs + self.time_funcsself.current_path = os.path.abspath(__file__)self.dir = os.path.dirname(self.current_path)self.result = []self.error = []self.filename = ''def main(self):self.root = Tk()self.root.config(bg='#ff741d')  # 背景颜色设置为公司主题色^_^self.root.title('Hive转Presto')self.win_width = 550self.win_height = 500self.screen_width = self.root.winfo_screenwidth()self.screen_height = self.root.winfo_screenheight()self.x = (self.screen_width - self.win_width) // 2self.y = (self.screen_height - self.win_height) // 2self.root.geometry(f'{self.win_width}x{self.win_height}+{self.x}+{self.y}')font = ('楷体', 11)self.button = Button(self.root, text='转换', command=self.trans, bg='#ffcc8c', font=font, anchor='e')self.button.grid(row=0, column=0, padx=100, pady=10, sticky=W)self.file_button = Button(self.root, text='选择文件', command=self.choose_file, bg='#ffcc8c', font=font,anchor='e')self.file_button.grid(row=0, column=1, padx=0, pady=10, sticky=W)self.entry = Entry(self.root, width=65, font=font)self.entry.insert(0, '输入Hive代码')self.entry.grid(row=1, column=0, padx=10, pady=10, columnspan=2)self.entry.bind('<Button-1>', self.delete_text)self.text = Text(self.root, width=75, height=20)self.text.grid(row=2, column=0, padx=10, pady=10, columnspan=2)self.des_label = Label(self.root, text='可以复制结果，也有生成的文件，与选取的文件同文件夹', bg='#ffcc8c',font=('楷体', 10))self.des_label.grid(row=3, column=0, padx=10, pady=10, columnspan=2)s = ''for i in range(0, (n := len(self.funcs)), 4):if i + 4 <= n:s += ','.join(self.funcs[i:i + 4]) + '\n'else:s += ','.join(self.funcs[i:]) + '\n's = s[:-1]self.des_label1 = Label(self.root, text=s, bg='#ffcc8c',font=('楷体', 10))self.des_label1.grid(row=4, column=0, padx=10, pady=10, columnspan=2)self.root.columnconfigure(0, minsize=10)self.root.columnconfigure(1, minsize=10)self.root.columnconfigure(0, pad=5)self.root.mainloop()def replace_func(self, s, res):"""把搜索到函数整体取出来，处理括号中的参数:param s::param res::return:"""for f in res:f1 = f.replace('\n', '').strip()f1 = re.sub(r'(\s*)', '(', f1)# 搜索括号里的字符串if re.findall(r'(\w*)\(', f1):func_name = re.findall(r'(\w*)\(', f1)[0].strip()else:continuetry:if 'date_add' == func_name.lower():date, date_num = self.extact_func(f1, func_name)s_n = f"date_add('day',{date_num},cast(substr(cast{date} as varchar,1,10) as date))"s = s.replace(f, s_n)elif 'datediff' == func_name.lower():date1, date2 = self.extact_func(f1, func_name)s_n = f"date_add('day',{date2},cast(substr(cast{date} as varchar,1,10) as date),cast(substr(cast{date1} as varchar),1,10) as date))"s = s.replace(f, s_n)elif 'nvl' == func_name.lower():s1, s2 = self.extact_func(f1, func_name)s_n = f"coalesce({s1},{s2})"s = s.replace(f, s_n)elif 'substr' == func_name.lower():date, start, end = self.extact_func(f1, func_name)s_n = f"substr(cast({date} as varchar),{start},{end}"s = s.replace(f, s_n)elif 'substring' == func_name.lower():date, start, end = self.extact_func(f1, func_name)s_n = f"substring(cast({date} as varchar),{start},{end}"s = s.replace(f, s_n)elif 'unit_timestamp' == func_name.lower():date = self.extact_func(f1, func_name)[0]s_n = f"to_unixtime(cast({date} as timestanp))"s = s.replace(f, s_n)elif 'to_date' == func_name.lower():date = self.extact_func(f1, func_name)[0]s_n = f"cast({date} as date)"s = s.replace(f, s_n)elif 'concat' == func_name.lower():res = self.extact_func(f1, func_name)[0]s_n = f'concat('for r in res:r = r.strip().replace('\n', '')s_n += f"cast({r} as varchar),"s_n = s_n[:-1] + ')'s = s.replace(f, s_n)elif 'sum' == func_name.lower():if 'unix_timestamp' in f1 or 'to_unixtime' in f1:continuess = self.extact_func(f1, func_name)[0]if 'if(' in ss.replace(' ', ''):continues = self.func_trans(f, f1, func_name, ss, s)elif 'avg' == func_name.lower():if 'unix_timestamp' in f1 or 'to_unixtime' in f1:continuess = self.extact_func(f1, func_name)[0]if 'if(' in ss.replace(' ', ''):continues = self.func_trans(f, f1, func_name, ss, s)elif 'abs' == func_name.lower():if 'unix_timestamp' in f1 or 'to_unixtime' in f1:continuess = self.extact_func(f1, func_name)[0]if 'if(' in ss.replace(' ', ''):continues = self.func_trans(f, f1, func_name, ss, s)elif 'ceiling' == func_name.lower():if 'unix_timestamp' in f1 or 'to_unixtime' in f1:continuess = self.extact_func(f1, func_name)[0]if 'if(' in ss.replace(' ', ''):continues = self.func_trans(f, f1, func_name, ss, s)elif 'floor' == func_name.lower():if 'unix_timestamp' in f1 or 'to_unixtime' in f1:continuess = self.extact_func(f1, func_name)[0]if 'if(' in ss.replace(' ', ''):continues = self.func_trans(f, f1, func_name, ss, s)elif 'year' == func_name.lower():date = self.extact_func(f1, func_name)[0]s_n = f"year(cast(substr(cast({date} as varchar,1,10) as date))"s = s.replace(f, s_n)elif 'month' == func_name.lower():date = self.extact_func(f1, func_name)[0]s_n = f"month(cast(substr(cast({date} as varchar,1,10) as date))"s = s.replace(f, s_n)elif 'date_sub' == func_name.lower():date, date_num = self.extact_func(f1, func_name)s_n = f"date_add('day',-{date_num},cast(substr(cast{date} as varchar,1,10) as date))"s = s.replace(f, s_n)except:self.error.append(f"源代码中{func_name}函数参数输入可能有错误，具体为：{f1}")continueif self.error:self.entry.delete(0, END)self.text.delete("1.0", END)self.text.insert("end", f"{s}")self.error.insert(0, '转换失败，有部分没有转成功\n')root_ex = Tk()root_ex.title('错误')win_width = 600win_height = 200screen_width = root_ex.winfo_screenwidth()screen_height = root_ex.winfo_screenheight()x = (screen_width - win_width) // 2y = (screen_height - win_height) // 2root_ex.geometry(f'{win_width}x{win_height}+{x}+{y}')label_ex = Label(root_ex, text="\n".join(self.error), font=("楷体", 10))label_ex.pack()root_ex.mainloop()return sdef func_trans(self, f, f1, func_name, ss, s):if not ('+' in ss or '-' in ss or '*' in ss or '/' in ss):date = self.extact_func(f1, func_name)[0]s_n = f'{func_name}(cast{date} as double))'s = s.replace(f, s_n)else:res1 = self.mysplit(f1)s_n = fn = len(s_n)for item in res1:if any(c.isalpha() for c in item.replace(' ', '')):idxs = s_n.find(item)idxs = [idxs] if type(idxs) != list else idxsfor idx in idxs:if idx + len(item) + 3 <= n:if not 'as' in s_n[idx:idx + len(item) + 4]:s_n = re.sub(rf'\b{item}\b', f'cast({item} as double)', s_n)else:s_n = re.sub(rf'\b{item}\b', f'cast({item} as double)', s_n)s = s.replace(f, s_n)return sdef choose_file(self):"""如果代码太多，从text中输入会很卡，直接选择代码文件输入会很快:return:"""self.filename = tkinter.filedialog.askopenfilename()if '/' in self.filename:self.filename = self.filename.replace('/', '\\')self.entry.delete(0, END)self.entry.insert(0, self.filename)def findvar(self, ss):"""搜索与计算有关的字段:param ss::return:"""global r1b = ['+', '-', '*', '/', '=', '!=', '>', '<', '<=', '>=', '<>']result1 = []result2 = []result1_n = []result2_n = []res_ops = []res1_ops = []res_adj = []res1_adj = []for op in b:s_temp1 = ss.replace('\n', ' ')s_temp2 = ss.replace('\n', ' ')s_temp3 = ss.replace('\n', ' ')if op == '/' or op == '=':op = opelif op == '+' or op == '-' or op == '*' or op == '>' or op == '<':op = f'\\{op[0]}'else:op = f'\\{op[0]}\\{op[1]}'parttern = f'\s*-*\d+\s*{op}\s*\w+|' + f'\s*-*\d+\.\s*{op}\s*\w+\.\s*\w+|' \+ f'\s*\w+\.\s*\w+\s*{op}\s*\w+\.\s*\w+|' + f'\s*\w+\s*{op}\s*\w+\.\s*\w+|' \+ f'\s*\w+\.\s*\w+\s*{op}\s*\w+|' + f'\s*\w+\s*{op}\s*\w+'parttern1 = f'\s*\)+\s*{op}\s*\w+|' + f'\s*\)+\s*{op}\s*\w+\.\s*\w+|' \+ f'\s*\w+\s*{op}\s*\(+|' + f'f\s*\w+\.\s*{op}\s*\(+'parttern2 = f'\s*\w+\s*{op}\s*\w+|' + f'\s*\w+\s*{op}\s*\w+\.\s*\w+|' \+ f'\s*\w+\s*{op}\s*\w+|' + f'f\s*\w+\.\s*{op}\s*\w+'while True:res = re.findall(parttern, s_temp1)if not res:breakresult2.extend(res)for r in res:r1 = r.replace(' ', '').split(f'op')result1.append(r1)res_ops.append(f'{op}')res_adj.append(False)s_temp1 = s_temp1.replace(f'{r1[0]}', '')# 搜索带括号的计算if op == '+' or op == '-' or op == '*' or op == '/':while True:res = re.findall(parttern1, s_temp2)if not res:breakresult2.extend(res)for r in res:r1 = r.replace(' ', '').split(f'{op}')result1.append(r1)res_ops.append(f'{op}')res_adj.append(False)tem = r1[0] if r1[0].strip() not in ['(', ')'] else r1[1]s_temp2 = s_temp2.replace(f'{tem}', '')else:res = re.findall(parttern2, s_temp3)result2.extend(res)for r in res:r1 = r.replace(' ', '').split(f'{op}')result1.append(r1)res_ops.append(f'{op}')res_adj.append(True)str_ = re.findall(r'\'([^\']*)\'', ss)str_ = list(set(str_))str_ = [v.rstrip(' \n') for v in str_]for i, fun in enumerate(result1):flag = 0for item in fun:if any(item.strip() in v for v in str_) or any(item.strip() == v for v in self.t_funcs):breakflag += 1if flag == 2 and result1[i] not in result1_n:result1_n.append(result1[i])result2_n.append(result2[i])res1_ops.append(res_ops[i])adj = result1[i][0] in self.time_funcs or result1[i][0] in self.time_funcsres1_adj.append(adj)if result1_n:z = zip(result1_n, result2_n, res1_ops, res1_adj)z1 = sorted(z, key=lambda x: len(x[1].replace(' ', '')), reverse=True)result1_n, result2_n, res1_ops, res1_adj = zip(*z1)return result1_n, result2_n, res1_ops, res1_adjdef mysplit(self, s):"""分割字段:param s::return:"""s = s.strip().replace(')', '').replace('(', '')b = ['+', '-', '*', '/']res = [s]result = []for op in b:n_res = []for item in res:n_res.extend(item.split(op))res = n_resfor item in res:if ' as ' not in item:result.append(re.findall(r'^[\w+_*]+$', item.replace(' ', ''))[0])result = list(set(res))return resultdef extact_func(self, s, func_name):res = []s = s[:-1].replace(f'{func_name}(', '', 1)com_idx = [i for i, v in enumerate(s) if v == ',']jd_com_idx = []for i in com_idx:s1 = s[0:i]if s1.count('(') == s1.count(')'):jd_com_idx.append(i)jd_com_idx.append(len(s))jd_com_idx.insert(0, 1)for i in range(1, len(jd_com_idx)):res.append(s[jd_com_idx[i - 1] + 1:jd_com_idx[i]])return resdef sort_funcs(self, li):li = sorted(li, key=lambda x: x.count('('), reverse=True)li_n = []for l in li:li_n.append(l)return li_ndef delete_text(self, event):self.entry.delete(0, END)self.filename = ''def trans(self):passif __name__ == '__main__':pro = Hive2Presto()pro.__int__()pro.main()