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1 import datetime |
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2 import decimal |
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3 from time import time |
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4 |
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5 from django.utils.hashcompat import md5_constructor |
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6 |
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7 class CursorDebugWrapper(object): |
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8 def __init__(self, cursor, db): |
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9 self.cursor = cursor |
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10 self.db = db # Instance of a BaseDatabaseWrapper subclass |
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11 |
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12 def execute(self, sql, params=()): |
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13 start = time() |
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14 try: |
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15 return self.cursor.execute(sql, params) |
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16 finally: |
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17 stop = time() |
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18 sql = self.db.ops.last_executed_query(self.cursor, sql, params) |
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19 self.db.queries.append({ |
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20 'sql': sql, |
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21 'time': "%.3f" % (stop - start), |
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22 }) |
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23 |
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24 def executemany(self, sql, param_list): |
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25 start = time() |
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26 try: |
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27 return self.cursor.executemany(sql, param_list) |
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28 finally: |
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29 stop = time() |
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30 self.db.queries.append({ |
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31 'sql': '%s times: %s' % (len(param_list), sql), |
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32 'time': "%.3f" % (stop - start), |
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33 }) |
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34 |
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35 def __getattr__(self, attr): |
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36 if attr in self.__dict__: |
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37 return self.__dict__[attr] |
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38 else: |
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39 return getattr(self.cursor, attr) |
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40 |
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41 def __iter__(self): |
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42 return iter(self.cursor) |
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43 |
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44 ############################################### |
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45 # Converters from database (string) to Python # |
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46 ############################################### |
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47 |
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48 def typecast_date(s): |
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49 return s and datetime.date(*map(int, s.split('-'))) or None # returns None if s is null |
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50 |
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51 def typecast_time(s): # does NOT store time zone information |
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52 if not s: return None |
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53 hour, minutes, seconds = s.split(':') |
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54 if '.' in seconds: # check whether seconds have a fractional part |
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55 seconds, microseconds = seconds.split('.') |
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56 else: |
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57 microseconds = '0' |
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58 return datetime.time(int(hour), int(minutes), int(seconds), int(float('.'+microseconds) * 1000000)) |
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59 |
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60 def typecast_timestamp(s): # does NOT store time zone information |
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61 # "2005-07-29 15:48:00.590358-05" |
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62 # "2005-07-29 09:56:00-05" |
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63 if not s: return None |
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64 if not ' ' in s: return typecast_date(s) |
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65 d, t = s.split() |
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66 # Extract timezone information, if it exists. Currently we just throw |
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67 # it away, but in the future we may make use of it. |
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68 if '-' in t: |
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69 t, tz = t.split('-', 1) |
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70 tz = '-' + tz |
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71 elif '+' in t: |
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72 t, tz = t.split('+', 1) |
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73 tz = '+' + tz |
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74 else: |
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75 tz = '' |
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76 dates = d.split('-') |
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77 times = t.split(':') |
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78 seconds = times[2] |
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79 if '.' in seconds: # check whether seconds have a fractional part |
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80 seconds, microseconds = seconds.split('.') |
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81 else: |
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82 microseconds = '0' |
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83 return datetime.datetime(int(dates[0]), int(dates[1]), int(dates[2]), |
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84 int(times[0]), int(times[1]), int(seconds), int(float('.'+microseconds) * 1000000)) |
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85 |
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86 def typecast_boolean(s): |
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87 if s is None: return None |
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88 if not s: return False |
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89 return str(s)[0].lower() == 't' |
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90 |
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91 def typecast_decimal(s): |
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92 if s is None or s == '': |
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93 return None |
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94 return decimal.Decimal(s) |
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95 |
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96 ############################################### |
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97 # Converters from Python to database (string) # |
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98 ############################################### |
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99 |
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100 def rev_typecast_boolean(obj, d): |
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101 return obj and '1' or '0' |
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102 |
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103 def rev_typecast_decimal(d): |
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104 if d is None: |
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105 return None |
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106 return str(d) |
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107 |
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108 def truncate_name(name, length=None): |
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109 """Shortens a string to a repeatable mangled version with the given length. |
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110 """ |
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111 if length is None or len(name) <= length: |
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112 return name |
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113 |
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114 hash = md5_constructor(name).hexdigest()[:4] |
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115 |
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116 return '%s%s' % (name[:length-4], hash) |
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117 |
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118 def format_number(value, max_digits, decimal_places): |
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119 """ |
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120 Formats a number into a string with the requisite number of digits and |
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121 decimal places. |
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122 """ |
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123 if isinstance(value, decimal.Decimal): |
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124 context = decimal.getcontext().copy() |
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125 context.prec = max_digits |
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126 return u'%s' % str(value.quantize(decimal.Decimal(".1") ** decimal_places, context=context)) |
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127 else: |
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128 return u"%.*f" % (decimal_places, value) |