数据库:Hive转Presto(三)

继续上节代码。

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']
        self.funcs = self.t_funcs + self.time_funcs
        self.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 = 550
        self.win_height = 500
        self.screen_width = self.root.winfo_screenwidth()
        self.screen_height = self.root.winfo_screenheight()
        self.x = (self.screen_width - self.win_width) // 2
        self.y = (self.screen_height - self.win_height) // 2
        self.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:
                continue
            try:
                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:
                        continue
                    ss = self.extact_func(f1, func_name)[0]
                    if 'if(' in ss.replace(' ', ''):
                        continue
                    s = self.func_trans(f, f1, func_name, ss, s)
                elif 'avg' == func_name.lower():
                    if 'unix_timestamp' in f1 or 'to_unixtime' in f1:
                        continue
                    ss = self.extact_func(f1, func_name)[0]
                    if 'if(' in ss.replace(' ', ''):
                        continue
                    s = self.func_trans(f, f1, func_name, ss, s)
                elif 'abs' == func_name.lower():
                    if 'unix_timestamp' in f1 or 'to_unixtime' in f1:
                        continue
                    ss = self.extact_func(f1, func_name)[0]
                    if 'if(' in ss.replace(' ', ''):
                        continue
                    s = self.func_trans(f, f1, func_name, ss, s)
                elif 'ceiling' == func_name.lower():
                    if 'unix_timestamp' in f1 or 'to_unixtime' in f1:
                        continue
                    ss = self.extact_func(f1, func_name)[0]
                    if 'if(' in ss.replace(' ', ''):
                        continue
                    s = self.func_trans(f, f1, func_name, ss, s)
                elif 'floor' == func_name.lower():
                    if 'unix_timestamp' in f1 or 'to_unixtime' in f1:
                        continue
                    ss = self.extact_func(f1, func_name)[0]
                    if 'if(' in ss.replace(' ', ''):
                        continue
                    s = 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)
            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}")
                continue
        if 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 = 600
            win_height = 200
            screen_width = root_ex.winfo_screenwidth()
            screen_height = root_ex.winfo_screenheight()
            x = (screen_width - win_width) // 2
            y = (screen_height - win_height) // 2
            root_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 s

    def 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 = f
            n = 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 idxs
                    for 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 s

    def 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:
        """
        b = ['+', '-', '*', '/', '=', '!=', '>', '<', '<=', '>=', '<>']
        result1 = []
        result2 = []
        result1_n = []
        result1_n = []
        res_ops = []
        res1_ops = []
        res_adj = []
        res1_adj = []
        
    def mysplit(self, s):
        """
        分割字段
        :param s:
        :return:
        """
        pass

    def extact_func(self, s, func_name):
        pass

    def delete_text(self, event):
        pass

    def trans(self):
        pass


if __name__ == '__main__':
    pro = Hive2Presto()
    pro.__int__()
    pro.main()

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