Mercurial > ~darius > hgwebdir.cgi > wh1080

annotate db/insertwunderground.c @ 7:9a14029b3782

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- Wait longer (100msec) for a read, and reduce the number of retries to match. - Print out if we read OK after more than 1 attempt for diagnostic purposes.
author Daniel O'Connor <darius@dons.net.au>
date Thu, 11 Feb 2010 12:47:59 +1030
parents 9dab44dcb331
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Read in Wunderground comma-delimited files and convert them into INSERT
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3 * commands for MySQL.
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4 *
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5 * $Id: insertwunderground.c,v 1.5 2009/12/09 03:27:55 grog Exp $
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6 */
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7 #include <ctype.h>
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <sys/file.h>
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12 #include <sys/stat.h>
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13 #include <sys/types.h>
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14 #include <unistd.h>
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15
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16
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17 #define BUFSIZE 1024
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18 char attribute_list [BUFSIZE];
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19 char buf [BUFSIZE];
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20 char sql_command [BUFSIZE];
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21 int attribute_count;
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22 char *station; /* name of station */
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23 char *date; /* and date from second parameter, if present */
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24
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25 /*
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26 * Convert the Wunderground field names to our table. This is confused by the
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27 * fact that Wunderground can't make up its mind what to call the fields, so
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28 * multiple names are possible, and they can have spaces in them. If we don't
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29 * care about the field, we have a null translation.
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30 *
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31 * Some fields are problems: time is really two fields, date and time, and
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32 * precipitation is sometimes in cm rather than mm. We special-case them.
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33 */
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34 struct attributes
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35 {
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36 char *wundername; /* name supplied in file */
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37 char *column_name; /* and the names we use */
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38 } attributes [] = {
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39 {"Clouds", "clouds"},
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40 {"Conditions", "conditions"},
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41 {"Dew PointC", "outside_dewpoint"},
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42 {"DewpointC", "outside_dewpoint"},
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43 {"Events", "events"},
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44 {"Gust SpeedKm/h", "wind_gust"},
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45 {"HourlyPrecipMM", "rain"},
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46 {"Humidity", "outside_humidity"},
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47 {"PrecipitationCm", ""},
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48 {"PressurehPa", "pressure_msl"}, /* I assume this is correct */
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49 {"Sea Level PressurehPa", "pressure_msl"},
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50 {"SoftwareType", ""},
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51 {"TemperatureC", "outside_temp"},
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52 {"Time", "date"},
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53 {"TimeEST", "time"},
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54 {"VisibilityKm", "visibility"},
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55 {"Wind Direction", "wind_direction_text"},
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56 {"Wind SpeedKm/h", "wind_speed"},
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57 {"WindDirection", "wind_direction_text"},
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58 {"WindDirectionDegrees", "wind_direction"},
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59 {"WindSpeedGustKMH", "wind_gust"},
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60 {"WindSpeedKMH", "wind_speed"},
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61 {"dailyrainCM", "" }};
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62
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63 int columns = sizeof (attributes) / sizeof (struct attributes);
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64
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65 int field [50]; /* build up a table of the fields here */
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66
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67 void skipblanks (char **cp)
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68 {
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69 while (**cp == ' ')
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70 (*cp)++;
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71 }
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72
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73 int main (int argc, char *argv [])
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74 {
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75 char *cp; /* pointers in buffers */
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76 char *ep; /* pointers in buffers */
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77 char *fp;
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78 char fieldname [64];
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79 int fields = 0; /* becomes number of fields in table */
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80 int myfield;
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81 int i;
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82
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83 if (argc < 2)
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84 {
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85 fprintf (stderr, "Usage: $0 < file STATION_ID\n");
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86 exit (1);
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87 }
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88 station = argv [1]; /* arg is station name */
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89 if (argc > 2) /* date specified too */
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90 date = argv [2];
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91
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92 /*
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93 * The first useful line should be a list of field names. Read it in and
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94 * decide what we want to use.
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95 */
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96 do
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97 {
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98 if (! fgets (attribute_list, BUFSIZE - 1, stdin))
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99 exit (0); /* empty file, just ignore */
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100 }
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101 while (strlen (attribute_list) < 4); /* I'm not sure how long the
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102 * initial junk is, but this
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103 * should cover it */
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104 /*
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105 * Untidy copy of field names.
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106 */
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107 cp = attribute_list;
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108 while (1)
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109 {
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110 fp = fieldname;
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111 skipblanks (&cp);
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112 while ((*cp != ',') && (*cp !='0') && (*cp !='<'))
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113 *fp++ = *cp++; /* copy the character */
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114 *fp = '\0'; /* and delimit it */
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115 for (i = 0; i < columns; i++)
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116 if (! strcmp (fieldname, attributes [i].wundername)) /* found it */
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117 {
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118 field [fields] = i;
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119 break;
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120 }
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121 if (i == columns) /* not found */
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122 {
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123 fprintf (stderr, "Warning: can't find field name %s\n", fieldname);
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124 field [fields] = -1; /* don't use this field */
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125 }
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126 if (strlen (attributes [i].column_name) == 0) /* no column */
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127 field [fields] = -1; /* */
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128 if ((*cp == '<') || (*cp == '\0')) /* end of useful info */
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129 break;
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130 cp++; /* skip the delimiter */
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131 fields++; /* done another field */
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132 }
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133 /*
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134 * On exit from the loop, fields contains the number of fields, and field []
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135 * is a translation table.
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136 */
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137 while (1)
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138 {
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139 if (! fgets (buf, BUFSIZE - 1, stdin))
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140 exit (0); /* empty file, just ignore */
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141 if (memcmp (buf, "20", 2) == 0) /* we have a line starting with at date */
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142 {
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143 char *time;
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144
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145 /* walk through the date field and convert it to two fields */
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146 sprintf (sql_command, "REPLACE INTO remote_observations (station_id, date, time");
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147 /* first get the names */
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148 for (myfield = 1; myfield < fields; myfield++)
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149 {
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150 if (field [myfield] >= 0)
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151 sprintf (&sql_command [strlen (sql_command)], ", %s", attributes [field [myfield]].column_name);
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152 }
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153 sprintf (&sql_command [strlen (sql_command)], ") VALUES (");
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154 /* and now the values */
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155 cp = buf;
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156 while (*cp != ' ')
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157 cp++;
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158 *cp++ = '\0'; /* split first field */
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159 skipblanks (&cp); /* this shouldn't be necessary */
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160 time = cp; /* second is time */
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161 while (*cp != ',')
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162 cp++; /* delimit */
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163 *cp++ = '\0'; /* delimit second field */
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164 /*
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165 * We now have buf pointing to the date, time pointing to the time, both
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166 * \0 delimited, and cp pointing to the rest of the buffer.
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167 */
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168 sprintf (&sql_command [strlen (sql_command)],
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169 "\"%s\", \"%s\", \"%s\"",
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170 station,
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171 buf,
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172 time );
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173 /*
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174 * Do the rest
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175 */
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176 for (myfield = 1; myfield < fields; myfield++)
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177 {
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178 skipblanks (&cp);
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179 ep = cp;
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180 while ((*ep != ',') && (*ep != '\n'))
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181 ep++;
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182 *ep++ = '\0'; /* make a string of it */
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183 if (field [myfield] >= 0)
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184 sprintf (&sql_command [strlen (sql_command)], ", \"%s\"", cp);
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185 cp = ep; /* point to next field */
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186 /*
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187 * Strictly speaking this isn't necessary, since we have a counted
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188 * number of fields, but I don't trust the data.
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189 */
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190 if (*cp == '\0')
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191 break;
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192 }
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193 sprintf (&sql_command [strlen (sql_command)], ");");
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194 puts (sql_command);
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195 }
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196 else if (isdigit (buf [0])) /* must be a time */
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197 {
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198 sprintf (sql_command, "REPLACE INTO remote_observations (station_id, date");
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199
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200
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201 /* first get the names */
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202 for (myfield = 0; myfield < fields; myfield++)
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203 {
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204 if (field [myfield] >= 0)
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205 sprintf (&sql_command [strlen (sql_command)], ", %s", attributes [field [myfield]].column_name);
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206 }
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207 sprintf (&sql_command [strlen (sql_command)], ") VALUES (\"%s\", \"%s\"",
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208 station,
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209 date );
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210 /*
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211 * Do the rest
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212 */
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213 cp = buf;
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214 for (myfield = 0; myfield < fields; myfield++)
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215 {
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216 skipblanks (&cp);
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217 ep = cp;
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218 while ((*ep != ',') && (*ep != '\n'))
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219 ep++;
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220 *ep++ = '\0'; /* make a string of it */
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221 if (field [myfield] >= 0)
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222 sprintf (&sql_command [strlen (sql_command)], ", \"%s\"", cp);
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223 cp = ep; /* point to next field */
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224 /*
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225 * Strictly speaking this isn't necessary, since we have a counted
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226 * number of fields, but I don't trust the data.
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227 */
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228 if (*cp == '\0')
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229 break;
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230 }
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231 sprintf (&sql_command [strlen (sql_command)], ");");
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232 puts (sql_command);
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233 }
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234 }
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235 return 0;
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236 }
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237