復制代碼 代碼如下:
<?php
/****************************************************************************************************************
為了便於自己的開發，又不想使用ADODB、PEAR::DB這樣的龐然大物，
就用在PHPLib DB類的基礎上、參考PEAR::DB類，封裝的DB類，簡單好使，非常方便。
MySQL有效
[ 連接數據庫 ]
//包含數據庫處理類文件
include_once("database.inc.php");
//本地數據庫配置
define("DB_HOST", "localhost"); //數據庫服務器
define("DB_USER_NAME", "root"); //數據庫用戶名
define("DB_USER_PASS", ""); //密碼
define("DB_DATABASE", "test"); //數據庫
//連接本地數據庫
$db = new DB_Sql();
$db->connect(DB_DATABASE, DB_HOST, DB_USER_NAME, DB_USER_PASS);
[ 使用方法 ]
//獲取所有記錄
$sql = "SELECT * FROM table1";
$all_record = $db->get_all($sql);
//獲取一條
$sql = "SELECT * FROM table1 WHERE id = '1'";
$one_row = $db->get_one($sql);
//分頁查詢，提取20條記錄
$sql = "SELECT * FROM table1";
$page_record = $db->limit_query($sql, $start=0, $offset=20, $order="ORDER BY id DESC");
//提取指定數目的記錄
$sql = "SELECT * FROM table1";
$limit_record = $db->get_limit($sql,10);
//統計記錄數，統計所有類型為學生的
$count = $db->count("table1", "id", "type = 'student'");
//插入一條記錄
$info_array = array(
"name" => "heiyeluren",
"type" => "student",
"age" => "22",
"gender" => "boy"
);
$db->insert("table1", $info_array);
//更新一條記錄
$info_array = array(
"name" => "heiyeluren",
"type" => "teacher",
"age" => "22",
"gender" => "boy"
);
$db->update("table1", $info_array, "name = 'heiyeluren'");
//刪除記錄
$db->delete("table1", "name = 'heiyeluren'");
//執行一條無結果集的SQL
$db->execute("DELETE FROM table1 WHERE name = 'heiyeluren'");
********************************************************************************************************/
/**
* 文件: database.inc.php
* 描述: 數據庫操作類
* 說明: 本庫使用PHPLib DB庫作為核心, 同時增加一些實用方法, 詳細參考注釋
*/
class DB_Sql
{
/* public: connection parameters */
var $Host = "";
var $Database = "";
var $User = "";
var $Password = "";
/* public: configuration parameters */
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";
/* public: result array and current row number */
var $Record = array();
var $Row;
/* public: current error number and error text */
var $Errno = 0;
var $Error = "";
/* public: this is an api revision, not a CVS revision. */
var $type = "mysql";
//var $revision = "1.2";
/* private: link and query handles */
var $Link_ID = 0;
var $Query_ID = 0;
var $locked = false; ## set to true while we have a lock
/* public: constructor */
function DB_Sql() {
$this->query($query);
}
/* public: some trivial reporting */
function link_id() {
return $this->Link_ID;
}
function query_id() {
return $this->Query_ID;
}
/* public: connection management */
function connect($Database = "", $Host = "", $User = "", $Password = "") {
/* Handle defaults */
if ("" == $Database)
$Database = $this->Database;
if ("" == $Host)
$Host = $this->Host;
if ("" == $User)
$User = $this->User;
if ("" == $Password)
$Password = $this->Password;
/* establish connection, select database */
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 $this->Link_ID;
}
/* public: discard the query result */
function free() {
@mysql_free_result($this->Query_ID);
$this->Query_ID = 0;
}
/* public: perform a query */
function query($Query_String) {
/* No empty queries, please, since PHP4 chokes on them. */
if ($Query_String == "")
/* The empty query string is passed on from the constructor,
* when calling the class without a query, e.g. in situations
* like these: '$db = new DB_Sql_Subclass;'
*/
return 0;
if (!$this->connect()) {
return 0; /* we already complained in connect() about that. */
};
# New query, discard previous result.
if ($this->Query_ID) {
$this->free();
}
if ($this->Debug)
printf("Debug: query = %s<br>\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 $this->Query_ID;
}
/* public: walk result set */
function next_record() {
if (!$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 $stat;
}
/* public: position in result set */
function seek($pos = 0) {
$status = @mysql_data_seek($this->Query_ID, $pos);
if ($status)
$this->Row = $pos;
else {
$this->halt("seek($pos) failed: result has ".$this->num_rows()." rows.");
/* half assed attempt to save the day,
* but do not consider this documented or even
* desireable behaviour.
*/
@mysql_data_seek($this->Query_ID, $this->num_rows());
$this->Row = $this->num_rows();
return 0;
}
return 1;
}
/* public: table locking */
function lock($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")) {
$this->halt("unlock() failed.");
return false;
}
return true;
}
/* public: evaluate the result (size, width) */
function affected_rows() {
return @mysql_affected_rows($this->Link_ID);
}
function num_rows() {
return @mysql_num_rows($this->Query_ID);
}
function num_fields() {
return @mysql_num_fields($this->Query_ID);
}
/* public: shorthand notation */
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];
}
}
/* public: sequence numbers */
function nextid($seq_name) {
/* if no current lock, lock sequence table */
if(!$this->locked) {
if($this->lock($this->Seq_Table)) {
$locked = true;
} else {
$this->halt("cannot lock ".$this->Seq_Table." - has it been created?");
return 0;
}
}
/* get sequence number and increment */
$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;
}
/* No current value, make one */
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 nextid() locked the sequence table, unlock it */
if($locked) {
$this->unlock();
}
return $nextid;
}
/* public: return table metadata */
function metadata($table = "", $full = false) {
$count = 0;
$id = 0;
$res = array();
/*
* Due to compatibility problems with Table we changed the behavior
* of metadata();
* depending on $full, metadata returns the following values:
*
* - full is false (default):
* $result[]:
* [0]["table"] table name
* [0]["name"] field name
* [0]["type"] field type
* [0]["len"] field length
* [0]["flags"] field flags
*
* - full is true
* $result[]:
* ["num_fields"] number of metadata records
* [0]["table"] table name
* [0]["name"] field name
* [0]["type"] field type
* [0]["len"] field length
* [0]["flags"] field flags
* ["meta"][field name] index of field named "field name"
* This last one could be used if you have a field name, but no index.
* Test: if (isset($result['meta']['myfield'])) { ...
*/
// 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;
}
/* public: find available table names */
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 $return;
}
/* private: error handling */
function halt($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("</td></tr></table><b>Database error:</b> %s<br>\n", $msg);
printf("<b>MySQL Error</b>: %s (%s)<br>\n",
$this->Errno,
$this->Error);
}
//----------------------------------
// 模塊: 自定義函數
// 功能: 部分實用的數據庫處理方法
// 作者: heiyeluren
//
