PHP实现的sqlite数据库连接类

*/
lass db_class {
var $conn=null;
var $querynum = 0;
/**
?* 数据库连接,返回数据库连接标识符
?*?
?* @param string $ 数据库服务器主机
?* @param string $ 数据库服务器帐号
?* @param string $ 数据库服务器暗码
?* @param string $ 数据库名
?* @param bool $ 是否保持持续连接,1为持续连接,0为非持续连接
?* @return link_identifier $dbuser,$dbpw,$dbname,
?*/
function connect($dbhost,$pconnect = 0) {
?$error = '';
?$func = $pconnect == 1 ? 'sqlite_popen' : 'sqlite_open';
?if (!$this -> conn = $func($dbhost,0666,$error)) {
? $this -> halt($error);
?}
?return $this -> conn;
}
/**
?* 执行sql语句
?*?
?* @param string $ sql语句
?* @param string $ 默认为空,可选值为 cache unbuffered
?* @param int $ cache以秒为单位的生命周期
?* @return resource?
?*/
function query($sql,$type = '',$expires = 3600,$dbname = '') {
?$error = '';
?$func = $type == 'unbuffered' ? 'sqlite_unbuffered_query' : 'sqlite_query';
?if (preg_match("/^s*select/i",$sql)) {
? $query = $func($this -> conn,$sql,sqlite_assoc,$error);
?} else {
? $query = sqlite_exec($this -> conn,$error);
?}?
?if ($error) {
? $this -> halt($error,$sql);
?}
?$this -> querynum++;
?return $query;
}?
/*
*@param string $ table名
*@param string $ where条件
*@param string $ colum名
?
*@param string $ limit数量?
?
*/
function getlist($table,$wheres = "1=1",? $colums = '*',$limits = '3000',$orderbys="id desc") {
?$query = $this -> query("select ".$colums." from ".$table." where ".$wheres." order by? ".$orderbys."? limit ".$limits,$type,$expires,$dbname);
?while($rs = $this -> fetch_array($query)){
? $datas[]=$rs;
? }
?//print_r("select ".$colums." from ".$table." where ".$wheres." limit ".$limits);
?//print_r($rs);die();
?$this -> free_result($query);
?return $datas ;
}
function add_one($table,$colums,$data ) {
?//die("insert into ".$table." (".$colums.") values(".$data.")");
?$query = $this -> query("insert into ".$table." (".$colums.") values(".$data.")",$dbname);
?//return $this->insert_id();
?return $query;
}
function delist($table,$idarray,$wheres="no") {
?if($wheres=='no')
? $query = $this -> query("delete from ".$table." where id in(".$idarray.")",$dbname);
?else
? $query = $this -> query("delete from ".$table." where ".$wheres,$dbname);
?return $query;
}
function updatelist($table,$updatedata,$idarray) {
?$query = $this -> query("update ".$table." set ". $updatedata."? where id in(".$idarray.")",$dbname);
?return $query;
}
//update max_vote set maxtitle='$title',maxban='$ban',
/**
?* 执行sql语句,只得到一条记录
?*?
?* @param string $ sql语句
?* @param string $ 默认为空,可选值为 cache unbuffered
?* @param int $ cache以秒为单位的生命周期
?* @return array?
?*/
function get_one($sql,$dbname = '') {
?$query = $this -> query($sql,$dbname);
?$rs = $this -> fetch_array($query);
?$this -> free_result($query);
?return $rs ;
}
/**
?* 从结果集中取得一行作为关联数组
?*?
?* @param resource $ 数据库查询结果资源
?* @param string $ 定义返回类型
?* @return array?
?*/
function fetch_array($query,$result_type = sqlite_assoc) {
?return sqlite_fetch_array($query,$result_type);
}
/**
?* 取得前一次 sqlite操作所影响的记录行数
?*?
?* @return int?
?*/
function affected_rows() {
?return sqlite_changes($this -> conn);
}
/**
?* 取得结果集中行的数目
?*?
?* @return int?
?*/
function num_rows($query) {
?return sqlite_num_rows($query);
}
/**
?* 返回结果集中字段的数目
?*?
?* @return int?
?*/
function num_fields($query) {
?return sqlite_num_fields($query);
}
/**
?*?
?* @return array 备用,一般不用.
?*/
function result($query,$row) {
?return @sqlite_fetch_all($query,sqlite_assoc);
}?
/**
?* sqlite没有相应函数
?*/
function free_result($query) {
?return ;
}
/**
?* 取得上一步 insert 操作产生的 id
?*?
?* @return int?
?*/
function insert_id() {
?return sqlite_last_insert_rowid($this -> connid);
}
/**
?*?
?* @return array 只得到数字索引
?*/
function fetch_row($query) {
?return sqlite_fetch_array($query,sqlite_num);
}?
/**
?*/
function fetch_assoc($query) {
?return $this -> fetch_array($query,sqlite_assoc);
}?
/**
?*?
?* @return string?
?*/
function version() {
?return sqlite_libversion();
}
function close() {
?return sqlite_close($this -> conn);
}
/**
?*?
?* @return string?
?*/
function error() {
?return sqlite_error_string($this -> errno);
}
/**
?*?
?* @return int?
?*/
function errno() {
?return sqlite_last_error($this -> conn);
}
/**
?* 显示mysql教程错误信息
?*/
function halt($message = '',$sql = '') {
?exit("sqlitequery:$sql <br> sqliteerror:" . $this -> error() . " <br> sqliteerrno:" . $this -> errno() . " <br> message:$message");
}