php 操作mysql数据库的类入门实例

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/**
 * 操作mysql数据库类
 *
 * @param 
 * @arrange （www.idcnote.com）
 **/
class Database {
 var $host;
 var $name;
 var $user;
 var $pass;
 var $prefix;
 var $linkId;
 
 function Database($mysql) {
  foreach($mysql as $k => $v){
   $this->$k = $v;
  }
  if(strlen($this->prefix)>0 && substr($this->prefix, -1) !== "_") $prefix .= "_";
  $this->prefix = $prefix;
 }
 
 function getLastID() {
  $id = mysql_fetch_row(mysql_query("SELECT LAST_INSERT_ID()", $this->linkId));
  return $id[0];
 }
 
 function getPossibleValues($tableA, $whereA) {
  if(gettype($tableA) == "array") {
   $table = "";
   foreach($tableA as $t) {
    $table .= $this->prefix.$t.", ";
   }
   $table = substr($table, 0, -2);
  } else $table = $this->prefix.$tableA;
  if(gettype($whereA) != "array") {
   $whereA = array($whereA);
  }
  $return = array();
  foreach($whereA as $where) {
   $sql = mysql_query("SHOW COLUMNS FROM ".$table." LIKE '%".$where."%'");
   while($arr = mysql_fetch_array($sql)) {
    if(strpos($arr['Type'], 'enum')===0) {
     $vals = substr($arr['Type'], 5, -1);
    } else {
     $vals = substr($arr['Type'], 4, -1);
    }
    $vals = str_replace("'","",$vals);
    $vals = explode(",",$vals);
    $i = 1;
    foreach($vals as $val) {
     $return[$arr['Field']][$i++] = $val;
    }
    $return[$arr['Field']]['default'] = $arr['Default'];
    if($arr['Null'] != "NO") $return[$arr['Field']][0] = NULL;
   }
  }
  return $return;
 }
 
 function connect() {
  $this->linkId = mysql_connect($this->host, $this->user, $this->pass);
  if(!$this->linkId) {
   return false;
  }
  if(mysql_select_db($this->name, $this->linkId)) return true;
  mysql_close($this->linkId);
  return false;
 }
 
 function runSelect($tables, $where = "1", $fieldsA = "*", $order = false, $limit = false, $offset = false, $group = false) {
  if(gettype($tables) == "array") {
   $table = "";
   foreach($tables as $t) {
    $table .= $this->prefix.$t.", ";
   }
   $table = substr($table, 0, -2);
  } else $table = $this->prefix.$tables;
  if(gettype($fieldsA) == "array") {
   $fields = "";
   $keys = array_keys($fieldsA);
 
   if($keys[0] != '0') {
    foreach($keys as $key) {
     $fields .= $key.' AS '.$fieldsA[$key].', ';
    }
   } else {
    foreach($fieldsA as $field) {
     $fields .= $field.', ';
    }
   }
   $fields = substr($fields, 0, -2);
 
  } else $fields = $fieldsA;
  $query = "SELECT ".$fields." FROM ".$table." WHERE ".$where.
   ($order!== false?" ORDER BY ".$order:($group!==false ? " GROUP BY ".$group : "")).
   ($limit !== false?" LIMIT ".$limit:"").
   ($offset !== false?" OFFSET ".$offset:"");
 
  return mysql_query($query, $this->linkId);
 }
 
 function runUpdate($table, $valuesA, $where = "1") {
  if(gettype($valuesA) == "array") {
   $fields = "";
   $values = "";
   $keys = array_keys($valuesA);
   foreach($keys as $key) {
    if($valuesA[$key] !== NULL)
     $values .= "`".$key."`='".str_replace("'",'\'', $valuesA[$key])."',";
    else
     $values .= $key."=NULL,";
   }
   $fields = substr($fields, 0, -1);
   $values = substr($values, 0, -1);
  } else $values = $valuesA;
  $query = "UPDATE ".$this->prefix.$table." SET ".$values." WHERE ".$where;
 
  if(mysql_query($query, 
    $this->linkId))
   return mysql_affected_rows($this->linkId);
  return false;
 }
 
 function runDelete($table, $where = "1") {
  if(mysql_query("DELETE FROM ".$this->prefix.$table." WHERE ".$where, $this->linkId))
   return mysql_affected_rows($this->linkId);
  return false;
 }
 
 function runInsert($table, $valuesA, $onDuplicate = NULL) {
  if(gettype($valuesA) == "array") {
   $fields = "";
   $values = "";
   $keys = array_keys($valuesA);
   foreach($keys as $key) {
    $fields .= "`".$key."`, ";
    $values .= ($valuesA[$key]===NULL?"NULL, ":"'".str_replace("'", '\'', $valuesA[$key])."', ");
   }
   $fields = substr($fields, 0, -2);
   $values = substr($values, 0, -2);
  }
 
  $onDup = "";
  if($onDuplicate != NULL) {
   $onDup = " ON DUPLICATE KEY UPDATE ";
   if(gettype($onDuplicate) == "array") {
    $keys = array_keys($onDuplicate);
    foreach($keys as $key) {
     $onDup .= '`'.$key.'`='.($onDuplicate[$key]===NULL?"NULL,":"'".str_replace("'", '\'', $onDuplicate[$key])."', ");
    }
    $onDup = substr($onDup, 0, -2);
   } else $onDup .= $onDuplicate;
  }
  $query = "INSERT INTO ".$this->prefix.$table.($fields!==NULL?"(".$fields.")":"").
   " VALUES (".$values.")".$onDup;
 
  if(mysql_query($query, $this->linkId)) 
   return mysql_affected_rows($this->linkId);
  return false;
 }
 
 function getCells($table){
  $query = "SHOW COLUMNS FROM `".$table."`";
  $fields = mysql_query($query, $this->linkId) or die('hej');
  return $fields;
 }
 
 function translateCellName($cellName){
  $sql = $this->runSelect("mysql_cell_translation","mysql_name = '".$cellName."'");
  $row = mysql_fetch_assoc($sql);
  return $row['human_name']?$row['human_name']:'<span class="faded">['.$cellName.']</span>';
 }
 
 function getError() {
  return mysql_error($this->linkId);
 }
 
 function close()
 {
  mysql_close($this->linkId);
 }
}

/***   代码来自php教程（www.idcnote.com）   ***/

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