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/* 
 * $Id: mysql.pike,v 1.16 2002/01/17 20:50:50 nilsson Exp $ 
 * 
 * Glue for the Mysql-module 
 */ 
 
//! Implements the glue needed to access the Mysql-module from the generic 
//! SQL module. 
 
#pike __REAL_VERSION__ 
 
#if constant(Mysql.mysql) 
 
inherit Mysql.mysql; 
 
#if constant( Mysql.mysql.MYSQL_NO_ADD_DROP_DB ) 
// Documented in the C-file. 
void create_db( string db ) 
{ 
  ::big_query( "CREATE DATABASE "+db ); 
} 
 
void drop_db( string db ) 
{ 
  ::big_query( "DROP DATABASE "+db ); 
} 
#endif 
 
//! Quote a string so that it can safely be put in a query. 
//! 
//! @param s 
//!   String to quote. 
string quote(string s) 
{ 
  return(replace(s, 
                 ({ "\\", "\"", "\0", "\'", "\n", "\r" }), 
                 ({ "\\\\", "\\\"", "\\0", "\\\'", "\\n", "\\r" }))); 
} 
 
// The following time conversion functions assumes the SQL server 
// handles time in this local timezone. They map the special zero 
// time/date spec to 0. 
 
private constant timezone = localtime (0)->timezone; 
 
//! Converts a system time value to an appropriately formatted time 
//! spec for the database. 
//! 
//! @param time 
//!   Time to encode. 
//! 
//! @param date 
//!   If nonzero then time is taken as a "full" unix time spec 
//!   (where the date part is ignored), otherwise it's converted as a 
//!   seconds-since-midnight value. 
string encode_time (int time, void|int date) 
{ 
  if (date) { 
    if (!time) return "000000"; 
    mapping(string:int) ct = localtime (time); 
    return sprintf ("%02d%02d%02d", ct->hour, ct->min, ct->sec); 
  } 
  else return sprintf ("%02d%02d%02d", time / 3600 % 24, time / 60 % 60, time % 60); 
} 
 
//! Converts a system time value to an appropriately formatted 
//! date-only spec for the database. 
//! 
//! @param time 
//!   Time to encode. 
string encode_date (int time) 
{ 
  if (!time) return "00000000"; 
  mapping(string:int) ct = localtime (time); 
  return sprintf ("%04d%02d%02d", ct->year + 1900, ct->mon + 1, ct->mday); 
} 
 
//! Converts a system time value to an appropriately formatted 
//! date and time spec for the database. 
//! 
//! @param time 
//!   Time to encode. 
string encode_datetime (int time) 
{ 
  if (!time) return "00000000000000"; 
  mapping(string:int) ct = localtime (time); 
  return sprintf ("%04d%02d%02d%02d%02d%02d", 
                  ct->year + 1900, ct->mon + 1, ct->mday, 
                  ct->hour, ct->min, ct->sec); 
} 
 
//! Converts a database time spec to a system time value. 
//! 
//! @param timestr 
//!   Time spec to decode. 
//! 
//! @param date 
//!   Take the date part from this system time value. If zero, a 
//!   seconds-since-midnight value is returned. 
int decode_time (string timestr, void|int date) 
{ 
  int hour = 0, min = 0, sec = 0; 
  if (sscanf (timestr, "%d:%d:%d", hour, min, sec) <= 1) 
    sscanf (timestr, "%2d%2d%2d", hour, min, sec); 
  if (date && (hour || min || sec)) { 
    mapping(string:int) ct = localtime (date); 
    return mktime (sec, min, hour, ct->mday, ct->mon, ct->year, ct->isdst, ct->timezone); 
  } 
  else return (hour * 60 + min) * 60 + sec; 
} 
 
//! Converts a database date-only spec to a system time value. 
//! Assumes 4-digit years. 
//! 
//! @param datestr 
//!   Date spec to decode. 
int decode_date (string datestr) 
{ 
  int year = 0, mon = 0, mday = 0, n; 
  n = sscanf (datestr, "%d-%d-%d", year, mon, mday); 
  if (n <= 1) n = sscanf (datestr, "%4d%2d%2d", year, mon, mday); 
  if (year || mon || mday) 
    return mktime (0, 0, 0, n == 3 ? mday : 1, n >= 2 && mon - 1, year - 1900, 
                   -1, timezone); 
  else return 0; 
} 
 
//! Converts a database date and time spec to a system time value. 
//! Can decode strings missing the time part. 
//! 
//! @param datestr 
//!   Date and time spec to decode. 
int decode_datetime (string timestr) 
{ 
  array(string) a = timestr / " "; 
  if (sizeof (a) == 2) 
    return decode_date (a[0]) + decode_time (a[1]); 
  else { 
    int n = sizeof (timestr); 
    if (n >= 12) 
      return decode_date (timestr[..n-7]) + decode_time (timestr[n-6..n-1]); 
    else 
      return decode_date (timestr); 
  } 
} 
 
//! 
int|object big_query(string q, mapping(string|int:mixed)|void bindings) 
{ 
  if (!bindings) 
    return ::big_query(q); 
  return ::big_query(.sql_util.emulate_bindings(q,bindings,this_object())); 
} 
 
int(0..1) is_keyword( string name ) 
//! Return 1 if the argument @[name] is a mysql keyword. 
{ 
  return (< 
      "action", "add", "aggregate", "all", "alter", "after", "and", "as", 
      "asc", "avg", "avg_row_length", "auto_increment", "between", "bigint", 
      "bit", "binary", "blob", "bool", "both", "by", "cascade", "case", 
      "char", "character", "change", "check", "checksum", "column", 
      "columns", "comment", "constraint", "create", "cross", "current_date", 
      "current_time", "current_timestamp", "data", "database", "databases", 
      "date", "datetime", "day", "day_hour", "day_minute", "day_second", 
      "dayofmonth", "dayofweek", "dayofyear", "dec", "decimal", "default", 
      "delayed", "delay_key_write", "delete", "desc", "describe", "distinct", 
      "distinctrow", "double", "drop", "end", "else", "escape", "escaped", 
      "enclosed", "enum", "explain", "exists", "fields", "file", "first", 
      "float", "float4", "float8", "flush", "foreign", "from", "for", "full", 
      "function", "global", "grant", "grants", "group", "having", "heap", 
      "high_priority", "hour", "hour_minute", "hour_second", "hosts", 
      "identified", "ignore", "in", "index", "infile", "inner", "insert", 
      "insert_id", "int", "integer", "interval", "int1", "int2", "int3", 
      "int4", "int8", "into", "if", "is", "isam", "join", "key", "keys", 
      "kill", "last_insert_id", "leading", "left", "length", "like", 
      "lines", "limit", "load", "local", "lock", "logs", "long", "longblob", 
      "longtext", "low_priority", "max", "max_rows", "match", "mediumblob", 
      "mediumtext", "mediumint", "middleint", "min_rows", "minute", 
      "minute_second", "modify", "month", "monthname", "myisam", "natural", 
      "numeric", "no", "not", "null", "on", "optimize", "option", 
      "optionally", "or", "order", "outer", "outfile", "pack_keys", 
      "partial", "password", "precision", "primary", "procedure", "process", 
      "processlist", "privileges", "read", "real", "references", "reload", 
      "regexp", "rename", "replace", "restrict", "returns", "revoke", 
      "rlike", "row", "rows", "second", "select", "set", "show", "shutdown", 
      "smallint", "soname", "sql_big_tables", "sql_big_selects", 
      "sql_low_priority_updates", "sql_log_off", "sql_log_update", 
      "sql_select_limit", "sql_small_result", "sql_big_result", 
      "sql_warnings", "straight_join", "starting", "status", "string", 
      "table", "tables", "temporary", "terminated", "text", "then", "time", 
      "timestamp", "tinyblob", "tinytext", "tinyint", "trailing", "to", 
      "type", "use", "using", "unique", "unlock", "unsigned", "update", 
      "usage", "values", "varchar", "variables", "varying", "varbinary", 
      "with", "write", "when", "where", "year", "year_month", "zerofill",       
  >)[ lower_case(name) ]; 
} 
 
#else /* !constant(Mysql.mysql) */ 
#error "Mysql support not available.\n" 
#endif /* constant(Mysql.mysql) */