一江春水向東流

class Sqlite {
var $link;
var $querynum = 0;

/*連接Sqlite數(shù)據(jù)庫，參數(shù)：dbname->數(shù)據(jù)庫名字*/
function Open($dbname) {
if(!($this->link = @sqlite_open($dbname))) {
$this->halt('Can not Open to Sqlite');
}
}

/*執(zhí)行sql語句，返回對應(yīng)的結(jié)果標(biāo)識*/
function Query($sql) {
$this->querynum++;
if($query = @sqlite_query($this->link, $sql)) {
return $query;
} else {
$this->halt('Sqlite Query Error', $sql);
}
}

/*執(zhí)行Insert Into語句，并返回最后的insert操作所產(chǎn)生的自動增長的id*/
function Insert($table, $iarr) {
$value = $this->InsertSql($iarr);
$this->Query('INSERT INTO "' . $table . '" ' . $value);
return sqlite_last_insert_rowid($this->link);
}

/*執(zhí)行Update語句，并返回最后的update操作所影響的行數(shù)*/
function Update($table, $uarr, $condition = '') {
$value = $this->UpdateSql($uarr);
if ($condition) {
$condition = ' WHERE ' . $condition;
}
$this->Query('UPDATE "' . $table . '"' . ' SET ' . $value . $condition);
return sqlite_changes($this->link);
}

/*執(zhí)行Delete語句，并返回最后的Delete操作所影響的行數(shù)*/
function Delete($table, $condition = '') {
if ($condition) {
$condition = ' WHERE ' . $condition;
}
$this->Query('DELETE "' . $table . '"' . $condition);
return sqlite_changes($this->link);
}

/*將字符轉(zhuǎn)為可以安全保存的sqlite值，比如a'a轉(zhuǎn)為a''a*/
/*
function EnCode($str) {
if (strpos($str, "\0") === false) {
if (strpos($str, '\'') === false) {
return $str;
} else {
return str_replace('\'', '\'\'', $str);
}
} else {
$str = str_replace("\0", '', $str);
if (strpos($str, '\'') === false) {
return $str;
} else {
return str_replace('\'', '\'\'', $str);
}
}
}
*/
function EnCode($str) {
return sqlite_escape_string($str);
}

/*將可以安全保存的sqlite值轉(zhuǎn)為正常的值，比如a''a轉(zhuǎn)為a'a*/
function DeCode($str) {
if (strpos($str, '\'\'') === false) {
return $str;
} else {
return str_replace('\'\'', '\'', $str);
}
}

/*將對應(yīng)的列和值生成對應(yīng)的insert語句，如：array('id' => 1, 'name' => 'name')返回("id", "name") VALUES (1, 'name')*/
function InsertSql($iarr) {
if (is_array($iarr)) {
$fstr = '';
$vstr = '';
foreach ($iarr as $key => $val) {
$fstr .= '"' . $key . '", ';
$vstr .= '\'' . $val . '\', ';
}
if ($fstr) {
$fstr = '(' . substr($fstr, 0, -2) . ')';
$vstr = '(' . substr($vstr, 0, -2) . ')';
return $fstr . ' VALUES ' . $vstr;
} else {
return '';
}
} else {
return '';
}
}

/*將對應(yīng)的列和值生成對應(yīng)的insert語句，如：array('id' => 1, 'name' => 'name')返回"id" = 1, "name" = 'name'*/
function UpdateSql($uarr) {
if (is_array($uarr)) {
$ustr = '';
foreach ($uarr as $key => $val) {
$ustr .= '"' . $key . '" = \'' . $val . '\', ';
}
if ($ustr) {
return substr($ustr, 0, -2);
} else {
return '';
}
} else {
return '';
}
}

/*返回對應(yīng)的查詢標(biāo)識的結(jié)果的一行*/
function GetRow($query, $result_type = SQLITE_ASSOC) {
return sqlite_fetch_array($query, $result_type);
}

/*清空查詢結(jié)果所占用的內(nèi)存資源*/
function Clear($query) {
$query = null;
return true;
}

/*關(guān)閉數(shù)據(jù)庫*/
function Close() {
return sqlite_close($this->link);
}

function halt($message = '', $sql = '') {
$ei = sqlite_last_error($this->link);
$message .= '<br />Sqlite Error: ' . $ei . ', ' . sqlite_error_string($ei);
if ($sql) {
$sql = '<br />sql:' . $sql;
}
exit('DataBase Error.<br />Message: ' . $message . $sql);
}
}