复制代码 代码如下:
class DB_Sql
{
var $Host = "";
var $Database = "";
var $User = "";
var $Password = "";
var $Auto_Free = 1; ## Set to 1 for automatic mysql_free_result()
var $Debug = 0; ## Set to 1 for debugging messages.
var $Halt_On_Error = "yes"; ## "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning)
var $PConnect = 0; ## Set to 1 to use persistent database connections
var $Seq_Table = "db_sequence";
var $Record = array();
var $Row;
var $Errno = 0;
var $Error = "";
var $type = "mysql";
//var $revision = "1.2";
var $link_ID = 0;
var $Query_ID = 0;
var $locked = false; ## set to true while we have a lock
function DB_Sql() {
$this->query($query);
}
function link_id() {
return $this->link_ID;
}
function query_id() {
return $this->Query_ID;
}
function connect($Database = "", $Host = "", $User = "", $Password = "") {
if ("" == $Database)
$Database = $this->Database;
if ("" == $Host)
$Host = $this->Host;
if ("" == $User)
$User = $this->User;
if ("" == $Password)
$Password = $this->Password;
if ( 0 == $this->link_ID ) {
if(!$this->PConnect) {
$this->link_ID = mysql_connect($Host, $User, $Password);
} else {
$this->link_ID = mysql_pconnect($Host, $User, $Password);
}
if (!$this->link_ID) {
$this->halt("connect($Host, $User, $Password) failed.");
return 0;
}
if (!@mysql_select_db($Database,$this->link_ID)) {
$this->halt("cannot use database ".$Database);
return 0;
}
}
return $this->link_ID;
}
function free() {
@mysql_free_result($this->Query_ID);
$this->Query_ID = 0;
}
function query($Query_String) {
if ($Query_String == "")
return 0;
if (!$this->connect()) {
return 0;
};
# New query, discard previous result.
if ($this->Query_ID) {
$this->free();
}
if ($this->Debug)
printf("Debug: query = %s
n", $Query_String);
$this->Query_ID = @mysql_query($Query_String,$this->link_ID);
$this->Row = 0;
$this->Errno = mysql_errno();
$this->Error = mysql_error();
if (!$this->Query_ID) {
$this->halt("Invalid SQL: ".$Query_String);
}
# Will return nada if it fails. That's fine.
return $this->Query_ID;
}
function next_record() {
if (!$this->Query_ID) {
$this->halt("next_record called with no query pending.");
return 0;
}
$this->Record = @mysql_fetch_array($this->Query_ID);
$this->Row += 1;
$this->Errno = mysql_errno();
$this->Error = mysql_error();
$stat = is_array($this->Record);
if (!$stat && $this->Auto_Free) {
$this->free();
}
return $stat;
}
function seek($pos = 0) {
$status = @mysql_data_seek($this->Query_ID, $pos);
if ($status)
$this->Row = $pos;
else {
$this->halt("seek($pos) failed: result has ".$this->num_rows()." rows.");
@mysql_data_seek($this->Query_ID, $this->num_rows());
$this->Row = $this->num_rows();
return 0;
}
return 1;
}
function lock($table, $mode = "write") {
$query = "lock tables ";
if(is_array($table)) {
while(list($key,$value) = each($table)) {
// text keys are "read", "read local", "write", "low priority write"
if(is_int($key)) $key = $mode;
if(strpos($value, ",")) {
$query .= str_replace(",", " $key, ", $value) . " $key, ";
} else {
$query .= "$value $key, ";
}
}
$query = substr($query, 0, -2);
} elseif(strpos($table, ",")) {
$query .= str_replace(",", " $mode, ", $table) . " $mode";
} else {
$query .= "$table $mode";
}
if(!$this->query($query)) {
$this->halt("lock() failed.");
return false;
}
$this->locked = true;
return true;
}
function unlock() {
// set before unlock to avoid potential loop
$this->locked = false;
if(!$this->query("unlock tables")) {
$this->halt("unlock() failed.");
return false;
}
return true;
}
function affected_rows() {
return @mysql_affected_rows($this->link_ID);
}
function num_rows() {
return @mysql_num_rows($this->Query_ID);
}
function num_fields() {
return @mysql_num_fields($this->Query_ID);
}
function nf() {
return $this->num_rows();
}
function np() {
print $this->num_rows();
}
function f($Name) {
if (isset($this->Record[$Name])) {
return $this->Record[$Name];
}
}
function p($Name) {
if (isset($this->Record[$Name])) {
print $this->Record[$Name];
}
}
function nextid($seq_name) {
if(!$this->locked) {
if($this->lock($this->Seq_Table)) {
$locked = true;
} else {
$this->halt("cannot lock ".$this->Seq_Table." - has it been created?");
return 0;
}
}
$q = sprintf("select nextid from %s where seq_name = '%s'",
$this->Seq_Table,
$seq_name);
if(!$this->query($q)) {
$this->halt('query failed in nextid: '.$q);
return 0;
}
if(!$this->next_record()) {
$currentid = 0;
$q = sprintf("insert into %s values('%s', %s)",
$this->Seq_Table,
$seq_name,
$currentid);
if(!$this->query($q)) {
$this->halt('query failed in nextid: '.$q);
return 0;
}
} else {
$currentid = $this->f("nextid");
}
$nextid = $currentid + 1;
$q = sprintf("update %s set nextid = '%s' where seq_name = '%s'",
$this->Seq_Table,
$nextid,
$seq_name);
if(!$this->query($q)) {
$this->halt('query failed in nextid: '.$q);
return 0;
}
if($locked) {
$this->unlock();
}
return $nextid;
}
function metadata($table = "", $full = false) {
$count = 0;
$id = 0;
$res = array();
// if no $table specified, assume that we are working with a query
// result
if ($table) {
$this->connect();
$id = @mysql_list_fields($this->Database, $table);
if (!$id) {
$this->halt("metadata query failed.");
return false;
}
} else {
$id = $this->Query_ID;
if (!$id) {
$this->halt("No query specified.");
return false;
}
}
$count = @mysql_num_fields($id);
// made this IF due to performance (one if is faster than $count if's)
if (!$full) {
for ($i=0; $i<$count; $i++) {
$res[$i]["table"] = @mysql_field_table ($id, $i);
$res[$i]["name"] = @mysql_field_name ($id, $i);
$res[$i]["type"] = @mysql_field_type ($id, $i);
$res[$i]["len"] = @mysql_field_len ($id, $i);
$res[$i]["flags"] = @mysql_field_flags ($id, $i);
}
} else { // full
$res["num_fields"]= $count;
for ($i=0; $i<$count; $i++) {
$res[$i]["table"] = @mysql_field_table ($id, $i);
$res[$i]["name"] = @mysql_field_name ($id, $i);
$res[$i]["type"] = @mysql_field_type ($id, $i);
$res[$i]["len"] = @mysql_field_len ($id, $i);
$res[$i]["flags"] = @mysql_field_flags ($id, $i);
$res["meta"][$res[$i]["name"]] = $i;
}
}
// free the result only if we were called on a table
if ($table) {
@mysql_free_result($id);
}
return $res;
}
function table_names() {
$this->connect();
$h = @mysql_query("show tables", $this->link_ID);
$i = 0;
while ($info = @mysql_fetch_row($h)) {
$return[$i]["table_name"] = $info[0];
$return[$i]["tablespace_name"] = $this->Database;
$return[$i]["database"] = $this->Database;
$i++;
}
@mysql_free_result($h);
return $return;
}
function halt($msg) {
$this->Error = @mysql_error($this->link_ID);
$this->Errno = @mysql_errno($this->link_ID);
if ($this->locked) {
$this->unlock();
}
if ($this->Halt_On_Error == "no")
return;
$this->haltmsg($msg);
if ($this->Halt_On_Error != "report")
die("Session halted.");
}
function haltmsg($msg) {
printf("Database error: %s
n", $msg);
printf("MySQL Error: %s (%s)
n",
$this->Errno,
$this->Error);
}
//----------------------------------
// 模块: 自定义函数
// 功能: 部分实用的数据库处理方法
// 作者: heiyeluren
// 时间: 2005-12-26
//----------------------------------
function execute($sql)
{
if (empty($sql))
{
$this->error("Invalid parameter");
}
if (!$this->query($sql))
{
return false;
}
return true;
}
function get_all($sql)
{
$this->query($sql);
$result_array = array();
while($this->next_record())
{
$result_array[] = $this->Record;
}
if (count($result_array)<=0)
{
return 0;
}
return $result_array;
}
function get_one($sql)
{
$this->query($sql);
if (!$this->next_record())
{
return 0;
}
return $this->Record;
}
function get_limit($sql, $limit)
{
$this->query($sql);
$result_array = array();
for ($i=0; $i<$limit&&$this->next_record(); $i++)
{
$result_array[] = $this->Record;
}
if (count($result_array) <= 0)
{
return 0;
}
return $result_array;
}
function limit_query($sql, $start=0, $offset=20, $order="")
{
$sql = $sql ." $order LIMIT $start,$offset";
$this->query($sql);
$result = array();
while($this->next_record())
{
$result[] = $this->Record;
}
if (count($result) <=0 )
{
return 0;
}
return $result;
}
function count($table,$field="*", $where="")
{
$sql = (empty($where) ? "SELECT COUNT($field) FROM $table" : "SELECt COUNT($field) FROM $table WHERe $where");
$result = $this->get_one($sql);
if (!is_array($result))
{
return 0;
}
return $result[0];
}
function insert($table,$dataArray)
{
if (!is_array($dataArray) || count($dataArray)<=0)
{
$this->error("Invalid parameter");
}
while(list($key,$val) = each($dataArray))
{
$field .= "$key,";
$value .= "'$val',";
}
$field = substr($field, 0, -1);
$value = substr($value, 0, -1);
$sql = "INSERT INTO $table ($field) VALUES ($value)";
if (!$this->query($sql))
{
return false;
}
return true;
}
function update($talbe, $dataArray, $where)
{
if (!is_array($dataArray) || count($dataArray)<=0)
{
$this->error("Invalid parameter");
}
while(list($key,$val) = each($dataArray))
{
$value .= "$key = '$val',";
}
$value = substr($value, 0, -1);
$sql = "UPDATE $talbe SET $value WHERe $where";
if (!$this->query($sql))
{
return false;
}
return true;
}
function delete($table, $where)
{
if (empty($where))
{
$this->error("Invalid parameter");
}
$sql = "DELETE FROM $table WHERe $where";
if (!$this->query($sql))
{
return false;
}
return true;
}
function error($msg="")
{
echo "Error: $msgn
n";
exit();
}
function get_insert_id()
{
return mysql_insert_id($this->link_ID);
}
function close()
{
return mysql_close($this->link_ID);
}
}
?>
