在PHPLIB中的MYSQL类中加INSERT,UPDATE,DELETE等函数

/*
 * Session Management for PHP3
 *
 * Copyright (c) 1998-2000 NetUSE AG
 *                    Boris Erdmann, Kristian Koehntopp
 *
 * $Id: db_mysql.inc,v 1.2 2000/07/12 18:22:34 kk Exp $
 *
 */

class DB_Sql {
 
  /* public: connection parameters */
  var $Host     = "";
  var $Database = "";
  var $User     = "";
  var $Password = "";

  /* public: configuration parameters */
  var $Auto_Free     = 0;     ## Set to 1 for automatic mysql_free_result()
  var $Debug         = 0;     ## Set to 1 for debugging messages.
  var $Halt_On_Error = "yes"; ## "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning)
  var $Seq_Table     = "db_sequence";

  /* public: result array and current row number */
  var $Record   = array();
  var $Row;

  /* public: current error number and error text */
  var $Errno    = 0;
  var $Error    = "";

  /* public: this is an api revision, not a CVS revision. */
  var $type     = "mysql";
  var $revision = "1.2";

  /* private: link and query handles */
  var $Link_ID  = 0;
  var $Query_ID = 0;
 
  var $sql = "";

  /* public: constructor */
  function DB_Sql($query = "") {
      $this->query($query);
  }

  /* public: some trivial reporting */
  function link_id() {
    return $this->Link_ID;
  }

  function query_id() {
    return $this->Query_ID;
  }

  /* public: connection management */
  function connect($Database = "", $Host = "", $User = "", $Password = "") {
    /* Handle defaults */
    if ("" == $Database)
      $Database = $this->Database;
    if ("" == $Host)
      $Host     = $this->Host;
    if ("" == $User)
      $User     = $this->User;
    if ("" == $Password)
      $Password = $this->Password;
     
    /* establish connection, select database */
    if ( 0 == $this->Link_ID ) {
   
      $this->Link_ID=mysql_pconnect($Host, $User, $Password);
      if (!$this->Link_ID) {
        $this->halt("pconnect($Host, $User, \$Password) failed.");
        return 0;
      }

      if (!@mysql_select_db($Database,$this->Link_ID)) {
        $this->halt("cannot use database ".$this->Database);
        return 0;
      }
    }
   
    return $this->Link_ID;
  }

  /* public: discard the query result */
  function free() {
      @mysql_free_result($this->Query_ID);
      $this->Query_ID = 0;
  }

  /* public: perform a query */
  function query($Query_String) {
    /* No empty queries, please, since PHP4 chokes on them. */
    if ($Query_String == "")
      /* The empty query string is passed on from the constructor,
       * when calling the class without a query, e.g. in situations
       * like these: '$db = new DB_Sql_Subclass;'
       */
      return 0;

    if (!$this->connect()) {
      return 0; /* we already complained in connect() about that. */
    };

    # New query, discard previous result.
    if ($this->Query_ID) {
      $this->free();
    }

    if ($this->Debug)
      printf("Debug: query = %s
\n", $Query_String);

    $this->Query_ID = @mysql_query($Query_String,$this->Link_ID);
    $this->Row   = 0;
    $this->Errno = mysql_errno();
    $this->Error = mysql_error();
    if (!$this->Query_ID) {
      $this->halt("Invalid SQL: ".$Query_String);
    }

    # Will return nada if it fails. That's fine.
    return $this->Query_ID;
  }

  /* public: walk result set */
  function next_record() {
    if (!$this->Query_ID) {
      $this->halt("next_record called with no query pending.");
      return 0;
    }

    $this->Record = @mysql_fetch_array($this->Query_ID);
    $this->Row   += 1;
    $this->Errno  = mysql_errno();
    $this->Error  = mysql_error();

    $stat = is_array($this->Record);
    if (!$stat && $this->Auto_Free) {
      $this->free();
    }
    return $stat;
  }
 
  /* public: insert record */
  function insert( $table, $data) {
    if ( is_array( $data ) ) {
  $this->sql = "INSERT INTO $table ( `".implode( "` , `" , array_keys($data) )."` )
    VALUES ( '".implode( "' , '", array_values($data) )."' )";
 } else {
  die("Error : Data Empty! ");
 }
 return $this->query( $this->sql );
  }
 
  /* public: delete record */
  function delete( $table, $where = "", $limit = 0 ) {
 $this->sql  = "DELETE FROM $table ";
 $this->sql .= $this->where($where);
 $this->sql .= intval($limit) ? " LIMIT ". intval($limit) : "";
 return $this->query( $this->sql );
  }
 
  /* public: update record */
  function update( $table, $update = "", $where = "", $limit = 0 ) {
    $setword = "";
 if( is_array( $update ) ) {
  while ( list( $field, $value ) = each($update) ) {
   $setword .= $setword ? " , " : "";
   $setword .= "`$field` = '".$value."'";
  }
 }else {
  $setword = $update;
 }
 
 $this->sql  = "UPDATE $table SET $setword ";
 $this->sql .= $this->where($where);
 $this->sql .= intval($limit) ? " LIMIT ". intval($limit) : "";
 return $this->query( $this->sql );
  }
 
 
  /* public: count record */
  function recordcount( $table, $where = "" ) {
    $this->sql = "SELECT COUNT(*) FROM $table " . $this->where($where);
 $this->query( $this->sql );
 if( $this->next_record() ) {
  return $this->f(0);
 }else {
  return 0;
 }
  }
 
  /* public: select record */
  function select( $table, $fields = "*", $where = "", $order = "", $group = "", $limit = 10 ) {
   
  }
 
  /* public: set where */
  function where( $where ) {
   $condition = "";
 if( is_array( $where ) ) {
  foreach( $where as $key => $val ){
   if( preg_match( "/^\d*$/", $key ) ) {//or
    foreach( $val as $k => $v ) {
     $condition .= $condition
         ? " OR ( `$k` = '".implode( "' AND `$k` = '", $v )."' )"
         : " WHERE ( `$k` = '".implode( "' AND `$k` = '", $v )."')";
    }
   }else {//and
    $condition .= $condition
        ? " AND ( `$key` = '".implode( "' OR `$key` = '", $val )."')"
        : " WHERE ( `$key` = '".implode( "' OR `$key` = '", $val )."')";
   }
  }
 }else {
  $condition .= " ".$where;
 }
    return $condition;
  }
 
  /* public: show sql */
  function showsql() {
    return $this->sql;
  }
 
  /* public: position in result set */
  function seek($pos = 0) {
    $status = @mysql_data_seek($this->Query_ID, $pos);
    if ($status)
      $this->Row = $pos;
    else {
      $this->halt("seek($pos) failed: result has ".$this->num_rows()." rows");

      /* half assed attempt to save the day,
       * but do not consider this documented or even
       * desireable behaviour.
       */
      @mysql_data_seek($this->Query_ID, $this->num_rows());
      $this->Row = $this->num_rows;
      return 0;
    }

    return 1;
  }

  /* public: table locking */
  function lock($table, $mode="write") {
    $this->connect();
   
    $query="lock tables ";
    if (is_array($table)) {
      while (list($key,$value)=each($table)) {
        if ($key=="read" && $key!=0) {
          $query.="$value read, ";
        } else {
          $query.="$value $mode, ";
        }
      }
      $query=substr($query,0,-2);
    } else {
      $query.="$table $mode";
    }
    $res = @mysql_query($query, $this->Link_ID);
    if (!$res) {
      $this->halt("lock($table, $mode) failed.");
      return 0;
    }
    return $res;
  }
 
  function unlock() {
    $this->connect();

    $res = @mysql_query("unlock tables");
    if (!$res) {
      $this->halt("unlock() failed.");
      return 0;
    }
    return $res;
  }

  /* public: evaluate the result (size, width) */
  function affected_rows() {
    return @mysql_affected_rows($this->Link_ID);
  }

  function num_rows() {
    return @mysql_num_rows($this->Query_ID);
  }

  function num_fields() {
    return @mysql_num_fields($this->Query_ID);
  }

  /* public: shorthand notation */
  function nf() {
    return $this->num_rows();
  }

  function np() {
    print $this->num_rows();
  }

  function f($Name) {
    return $this->Record[$Name];
  }

  function p($Name) {
    print $this->Record[$Name];
  }

  /* public: sequence numbers */
  function nextid($seq_name) {
    $this->connect();
   
    if ($this->lock($this->Seq_Table)) {
      /* get sequence number (locked) and increment */
      $q  = sprintf("select nextid from %s where seq_name = '%s'",
                $this->Seq_Table,
                $seq_name);
      $id  = @mysql_query($q, $this->Link_ID);
      $res = @mysql_fetch_array($id);
     
      /* No current value, make one */
      if (!is_array($res)) {
        $currentid = 0;
        $q = sprintf("insert into %s values('%s', %s)",
                 $this->Seq_Table,
                 $seq_name,
                 $currentid);
        $id = @mysql_query($q, $this->Link_ID);
      } else {
        $currentid = $res["nextid"];
      }
      $nextid = $currentid + 1;
      $q = sprintf("update %s set nextid = '%s' where seq_name = '%s'",
               $this->Seq_Table,
               $nextid,
               $seq_name);
      $id = @mysql_query($q, $this->Link_ID);
      $this->unlock();
    } else {
      $this->halt("cannot lock ".$this->Seq_Table." - has it been created?");
      return 0;
    }
    return $nextid;
  }

  /* public: return table metadata */
  function metadata($table='',$full=false) {
    $count = 0;
    $id    = 0;
    $res   = array();

    /*
     * Due to compatibility problems with Table we changed the behavior
     * of metadata();
     * depending on $full, metadata returns the following values:
     *
     * - full is false (default):
     * $result[]:
     *   [0]["table"]  table name
     *   [0]["name"]   field name
     *   [0]["type"]   field type
     *   [0]["len"]    field length
     *   [0]["flags"]  field flags
     *
     * - full is true
     * $result[]:
     *   ["num_fields"] number of metadata records
     *   [0]["table"]  table name
     *   [0]["name"]   field name
     *   [0]["type"]   field type
     *   [0]["len"]    field length
     *   [0]["flags"]  field flags
     *   ["meta"][field name]  index of field named "field name"
     *   The last one is used, if you have a field name, but no index.
     *   Test:  if (isset($result['meta']['myfield'])) { ...
     */

    // if no $table specified, assume that we are working with a query
    // result
    if ($table) {
      $this->connect();
      $id = @mysql_list_fields($this->Database, $table);
      if (!$id)
        $this->halt("Metadata query failed.");
    } else {
      $id = $this->Query_ID;
      if (!$id)
        $this->halt("No query specified.");
    }
 
    $count = @mysql_num_fields($id);

    // made this IF due to performance (one if is faster than $count if's)
    if (!$full) {
      for ($i=0; $i        $res[$i]["table"] = @mysql_field_table ($id, $i);
        $res[$i]["name"]  = @mysql_field_name  ($id, $i);
        $res[$i]["type"]  = @mysql_field_type  ($id, $i);
        $res[$i]["len"]   = @mysql_field_len   ($id, $i);
        $res[$i]["flags"] = @mysql_field_flags ($id, $i);
      }
    } else { // full
      $res["num_fields"]= $count;
   
      for ($i=0; $i        $res[$i]["table"] = @mysql_field_table ($id, $i);
        $res[$i]["name"]  = @mysql_field_name  ($id, $i);
        $res[$i]["type"]  = @mysql_field_type  ($id, $i);
        $res[$i]["len"]   = @mysql_field_len   ($id, $i);
        $res[$i]["flags"] = @mysql_field_flags ($id, $i);
        $res["meta"][$res[$i]["name"]] = $i;
      }
    }
   
    // free the result only if we were called on a table
    if ($table) @mysql_free_result($id);
    return $res;
  }

  /* private: error handling */
  function halt($msg) {
    $this->Error = @mysql_error($this->Link_ID);
    $this->Errno = @mysql_errno($this->Link_ID);
    if ($this->Halt_On_Error == "no")
      return;

    $this->haltmsg($msg);

    if ($this->Halt_On_Error != "report")
      die("Session halted.");
  }

  function haltmsg($msg) {
    printf("Database error: %s
\n", $msg);
    printf("MySQL Error: %s (%s)
\n",
      $this->Errno,
      $this->Error);
  }

  function table_names() {
    $this->query("SHOW TABLES");
    $i=0;
    while ($info=mysql_fetch_row($this->Query_ID))
     {
      $return[$i]["table_name"]= $info[0];
      $return[$i]["tablespace_name"]=$this->Database;
      $return[$i]["database"]=$this->Database;
      $i++;
     }
   return $return;
  }
}
?>