PHP实现的sqlite数据库连接类_php技巧

*/
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 $ 数据库服务器密码
* @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, $sql, $error);
}
if ($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.")", $type, $expires, $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.")", $type, $expires, $dbname);
else
$query = $this -> query("delete from ".$table." where ".$wheres, $type, $expires, $dbname);
return $query;
}
function updatelist($table , $updatedata,$idarray) {
$query = $this -> query("update ".$table." set ". $updatedata." where id in(".$idarray.")", $type, $expires, $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, $type = '', $expires = 3600, $dbname = '') {
$query = $this -> query($sql, $type, $expires, $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
sqliteerror:" . $this -> error() . "
sqliteerrno:" . $this -> errno() . "
message:$message");
}