数据库：Hive转Presto（二）
继续上节代码，补充了replace_func函数，
import re
import os
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('', 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):
pass
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:
"""
pass
def findvar(self, ss):
"""
搜索与计算有关的字段
:param ss:
:return:
"""
pass
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()