#!/usr/local/bin/python3 # -*- coding:utf-8 -*- # AUTHOR:Howard hao import os,json,re # 取数据库路径 BASE_DIR = os.path.dirname(os.path.dirname(__file__)) DB_DIR = os.path.join(BASE_DIR,‘db‘) DB_FILE = os.path.join(DB_DIR,‘form_info‘) # 读取json数据到字典 f = open(DB_FILE,‘r‘,encoding=‘utf-8‘) data = json.loads(f.read()) f.close() SQL = input(‘请输入sql语句:‘) # 查询操作判断 RE = re.search(‘^\s*select\s+name,age\s+from\s+staff_table\s+where\s+age\s+>\s+(\d+)\s*$‘,SQL) RE1 = re.search("^\S*select\s+[*]\s+from\s+staff_table\s+where\s+dept\s*=\s*‘?\"?(\w+)‘?\"?\s*$",SQL) RE3 = re.search("^\s*select\s+[*]\s+from\s+staff_table\s+where\s+enroll_date\s+like\s+‘?\"?(\w+)‘?\"?\s*$",SQL) # 插入操作判断 RE4 = re.search("^\s*insert\s+into\s+staff_table\(\s*name\s*,\s*age\s*,\s*phone\s*,\s*dept\s*,\s*enroll_date\s*\)\s+values\(\s*‘?([^‘]+)‘?\s*,\s*‘?([^‘]+)‘?\s*,\s*‘?([^‘]+)‘?\s*,\s*‘?([^‘]+)‘?\s*,\s*‘?([^‘]+)‘?\s*\)$",SQL) # 删除操作判断 RE5 = re.search(‘^\s*([0-9]+)\s*$‘,SQL) # 修改操作判断 RE6 = re.search("^\s*UPDATE\s+staff_table\s+SET\s+dept\s*=\s*\"?\‘?(\w+)\‘?\"?\s+WHERE\s+dept\s*=\s*\"?‘?(\w+)‘?\"?\s*$",SQL) # 数据库处理 if RE: print(‘+‘ + ‘-‘*10 + ‘+‘ + ‘-‘*6 + ‘+‘) print(‘|‘ + ‘NAME‘.ljust(10) + ‘|‘ + ‘AGE‘.ljust(6) + ‘|‘) print(‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 6 + ‘+‘) count = 0 for i in data.keys(): if int(data[i][1]) > int(RE.groups()[-1]): count += 1 print(‘|‘ + str(data[i][0]).ljust(10) + ‘|‘ + str(data[i][1]).ljust(6) + ‘|‘) print(‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 6 + ‘+‘) else: print(‘%d row(s) returned‘ %count) if RE1: print(‘+‘ + ‘-‘*10 + ‘+‘ + ‘-‘*10 + ‘+‘ + ‘-‘*5 + ‘+‘ + ‘-‘*15 + ‘+‘ + ‘-‘*10 + ‘+‘ + ‘—‘*13 + ‘+‘) print(‘|‘ + ‘staff_id‘.ljust(10) + ‘|‘ + ‘name‘.ljust(10) + ‘|‘ + ‘age‘.ljust(5) + ‘|‘ + ‘phone‘.ljust(15) + ‘|‘ + ‘dept‘.ljust(10) + ‘|‘ + ‘enroll_date‘.ljust(13) + ‘|‘) print(‘+‘ + ‘-‘*10 + ‘+‘ + ‘-‘*10 + ‘+‘ + ‘-‘*5 + ‘+‘ + ‘-‘*15 + ‘+‘ + ‘-‘*10 + ‘+‘ + ‘—‘*13 + ‘+‘) count = 0 for i in data.keys(): if data[i][3] == RE1.groups()[-1]: count += 1 print(‘|‘ + i.ljust(10) + ‘|‘ + str(data[i][0]).ljust(10) + ‘|‘ + str(data[i][1]).ljust(5) + ‘|‘ + str(data[i][2]).ljust(15) + ‘|‘ + str(data[i][3]).ljust(10) + ‘|‘ + str(data[i][4]).ljust(13) + ‘|‘) print(‘+‘ + ‘-‘*10 + ‘+‘ + ‘-‘*10 + ‘+‘ + ‘-‘*5 + ‘+‘ + ‘-‘*15 + ‘+‘ + ‘-‘*10 + ‘+‘ + ‘—‘*13 + ‘+‘) else: print(‘%d row(s) returned‘ % count) if RE3: print(‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 5 + ‘+‘ + ‘-‘ * 15 + ‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘—‘ * 13 + ‘+‘) print(‘|‘ + ‘staff_id‘.ljust(10) + ‘|‘ + ‘name‘.ljust(10) + ‘|‘ + ‘age‘.ljust(5) + ‘|‘ + ‘phone‘.ljust(15) + ‘|‘ + ‘dept‘.ljust(10) + ‘|‘ + ‘enroll_date‘.ljust(13) + ‘|‘) print(‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 5 + ‘+‘ + ‘-‘ * 15 + ‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘—‘ * 13 + ‘+‘) count = 0 for i in data.keys(): if RE3.groups()[-1] in data[i][4]: count += 1 print(‘|‘ + i.ljust(10) + ‘|‘ + str(data[i][0]).ljust(10) + ‘|‘ + str(data[i][1]).ljust(5) + ‘|‘ + str(data[i][2]).ljust(15) + ‘|‘ + str(data[i][3]).ljust(10) + ‘|‘ + str(data[i][4]).ljust(13) + ‘|‘) print(‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘-‘ * 5 + ‘+‘ + ‘-‘ * 15 + ‘+‘ + ‘-‘ * 10 + ‘+‘ + ‘—‘ * 13 + ‘+‘) else: print(‘%d row(s) returned‘ % count) if RE4: for i in data.keys(): if RE4.groups()[2] == str(data[i][2]): print("Error Code: 1062. Duplicate entry ‘4‘ for key ‘PRIMARY‘") exit() id4 = 1 while str(id4) in data.keys(): id4 += 1 data[id4]=[RE4.groups()[0],RE4.groups()[1],RE4.groups()[2],RE4.groups()[3],RE4.groups()[4]] f1 = open(DB_FILE, ‘w‘, encoding=‘utf-8‘) f1.write(json.dumps(data)) f1.close() if RE5: id5 = RE5.group() data.pop(id5) f2 = open(DB_FILE, ‘w‘, encoding=‘utf-8‘) f2.write(json.dumps(data)) f2.close() print(‘staff_id 为 %s 员工信息删除成功!‘ %id5) if RE6: after_update = RE6.groups()[0] before_update = RE6.groups()[1] for i in data.keys(): if data[i][3] == before_update: data[i][3] = after_update f3 = open(DB_FILE, ‘w‘, encoding=‘utf-8‘) f3.write(json.dumps(data)) f3.close() print(‘修改成功‘)
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