php 数据库mysql查询与连接类
class mysql
{
var $host = ""; //mysql主机名
var $user = ""; //mysql用户名
var $pwd = ""; //mysql密码
var $dbName = ""; //mysql数据库名称
var $linkID = 0; //用来保存连接ID
var $queryID = 0; //用来保存查询ID
var $fetchMode= MYSQL_ASSOC;//取记录时的模式
var $queryTimes = 0; //保存查询的次数
var $errno = 0; //mysql出错代号
var $error = ""; //mysql出错信息
var $record = array(); //一条记录数组
//======================================
// 函数: mysql()
// 功能: 构造函数
// 参数: 参数类的变量定义
// 说明: 构造函数将自动连接数据库
// 如果想手动连接去掉连接函数
//======================================
function mysql($host,$user,$pwd,$dbName)
{ if(empty($host) || empty($user) || empty($dbName))
$this->halt("数据库主机地址,用户名或数据库名称不完全,请检查!");
$this->host = $host;
$this->user = $user;
$this->pwd = $pwd;
$this->dbName = $dbName;
$this->connect();//设置为自动连接
}
//======================================
// 函数: connect($host,$user,$pwd,$dbName)
// 功能: 连接数据库
// 参数: $host 主机名, $user 用户名
// 参数: $pwd 密码, $dbName 数据库名称
// 返回: 0:失败
// 说明: 默认使用类中变量的初始值
//======================================
function connect($host = "", $user = "", $pwd = "", $dbName = "")
{
if ("" == $host)
$host = $this->host;
if ("" == $user)
$user = $this->user;
if ("" == $pwd)
$pwd = $this->pwd;
if ("" == $dbName)
$dbName = $this->dbName;
//now connect to the database
$this->linkID = mysql_pconnect($host, $user, $pwd);
if (!$this->linkID)
{
$this->halt();
return 0;
}
if (!mysql_select_db($dbName, $this->linkID))
{
$this->halt();
return 0;
}
return $this->linkID;
}
//======================================
// 函数: query($sql)
// 功能: 数据查询
// 参数: $sql 要查询的SQL语句
// 返回: 0:失败
//======================================
function query($sql)
{
$this->queryTimes++;
$this->queryID = mysql_query($sql, $this->linkID);
if (!$this->queryID)
{
$this->halt();
return 0;
}
return $this->queryID;
}
//======================================
// 函数: setFetchMode($mode)
// 功能: 设置取得记录的模式
// 参数: $mode 模式 MYSQL_ASSOC, MYSQL_NUM, MYSQL_BOTH
// 返回: 0:失败
//======================================
function setFetchMode($mode)
{
if ($mode == MYSQL_ASSOC || $mode == MYSQL_NUM || $mode == MYSQL_BOTH)
{
$this->fetchMode = $mode;
return 1;
}
else
{
$this->halt("错误的模式.");
return 0;
}
}
//======================================
// 函数: fetchRow()
// 功能: 从记录集中取出一条记录
// 返回: 0: 出错 record: 一条记录
//======================================
function fetchRow()
{
$this->record = mysql_fetch_array($this->queryID,$this->fetchMode);
return $this->record;
}
//======================================
// 函数: fetchAll()
// 功能: 从记录集中取出所有记录
// 返回: 记录集数组
//======================================
function fetchAll()
{
$arr = array();
while($this->record = mysql_fetch_array($this->queryID,$this->fetchMode))
{
$arr[] = $this->record;
}
mysql_free_result($this->queryID);
return $arr;
}
//======================================
// 函数: getValue()
// 功能: 返回记录中指定字段的数据
// 参数: $field 字段名或字段索引
// 返回: 指定字段的值
//======================================
function getValue($field)
{
return $this->record[$field];
}
//======================================
// 函数: affectedRows()
// 功能: 返回影响的记录数
//======================================
function affectedRows()
{
return mysql_affected_rows($this->linkID);
}
//======================================
// 函数: recordCount()
// 功能: 返回查询记录的总数
// 参数: 无
// 返回: 记录总数
//======================================
function recordCount()
{
return mysql_num_rows($this->queryID);
}
//======================================
// 函数: getQueryTimes()
// 功能: 返回查询的次数
// 参数: 无
// 返回: 查询的次数
//======================================
function getQueryTimes()
{
return $this->queryTimes;
}
//======================================
// 函数: getVersion()
// 功能: 返回mysql的版本
// 参数: 无
//======================================
function getVersion()
{
$this->query("select version() as ver");
$this->fetchRow();
return $this->getValue("ver");
}
//======================================
// 函数: getDBSize($dbName, $tblPrefix=null)
// 功能: 返回数据库占用空间大小
// 参数: $dbName 数据库名
// 参数: $tblPrefix 表的前缀,可选
//======================================
function getDBSize($dbName, $tblPrefix=null)
{
$sql = "SHOW TABLE STATUS FROM " . $dbName;
if($tblPrefix != null) {
$sql .= " LIKE '$tblPrefix%'";
}
$this->query($sql);
$size = 0;
while($this->fetchRow())
$size += $this->getValue("Data_length") + $this->getValue("Index_length");
return $size;
}
//======================================
// 函数: insertID()
// 功能: 返回最后一次插入的自增ID
// 参数: 无
//======================================
function insertID() {
return mysql_insert_id();
}
//======================================
// 函数: halt($err_msg)
// 功能: 处理所有出错信息
// 参数: $err_msg 自定义的出错信息
//=====================================
function halt($err_msg="")
{
if ("" == $err_msg)
{
$this->errno = mysql_errno();
$this->error = mysql_error();
echo "mysql error:
";
echo $this->errno.":".$this->error."
";
exit;
}
else
{
echo "mysql error:
";
echo $err_msg."
";
exit;
}
}
}
?>

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