一個普遍通用的PHP連接MYSQL數據庫類
<?php
class mysql {
private $db_host; //數據庫主機
private $db_user; //數據庫用戶名
private $db_pwd; //數據庫用戶名密碼
private $db_database; //數據庫名
private $conn; //數據庫連接標識;
private $result; //執行query命令的結果資源標識
private $sql; //sql執行語句
private $row; //返回的條目數
private $coding; //數據庫編碼，GBK,UTF8,gb2312
private $bulletin = true; //是否開啟錯誤記錄
private $show_error = true; //測試階段，顯示所有錯誤,具有安全隱患,默認關閉
private $is_error = false; //發現錯誤是否立即終止,默認true,建議不啟用，因為當有問題時用戶什么也看不到是很苦惱的
/*構造函數*/
public function __construct($db_host, $db_user, $db_pwd, $db_database, $conn, $coding) {
$this->db_host = $db_host;
$this->db_user = $db_user;
$this->db_pwd = $db_pwd;
$this->db_database = $db_database;
$this->conn = $conn;
$this->coding = $coding;
$this->connect();
}
/*數據庫連接*/
public function connect() {
if ($this->conn == "pconn") {
//永久鏈接
$this->conn = mysql_pconnect($this->db_host, $this->db_user, $this->db_pwd);
} else {
//即使鏈接
$this->conn = mysql_connect($this->db_host, $this->db_user, $this->db_pwd);
}
if (!mysql_select_db($this->db_database, $this->conn)) {
if ($this->show_error) {
$this->show_error("數據庫不可用：", $this->db_database);
}
}
mysql_query("SET NAMES $this->coding");
}
/*數據庫執行語句，可執行查詢添加修改刪除等任何sql語句*/
public function query($sql) {
if ($sql == "") {
$this->show_error("SQL語句錯誤：", "SQL查詢語句為空");
}
$this->sql = $sql;
$result = mysql_query($this->sql, $this->conn);
if (!$result) {
//調試中使用，sql語句出錯時會自動打印出來
if ($this->show_error) {
$this->show_error("錯誤SQL語句：", $this->sql);
}
} else {
$this->result = $result;
}
return $this->result;
}
/*創建添加新的數據庫*/
public function create_database($database_name) {
$database = $database_name;
$sqlDatabase = 'create database ' . $database;
$this->query($sqlDatabase);
}
/*查詢服務器所有數據庫*/
//將系統數據庫與用戶數據庫分開，更直觀的顯示？
public function show_databases() {
$this->query("show databases");
echo "現有數據庫：" . $amount = $this->db_num_rows($rs);
echo "<br />";
$i = 1;
while ($row = $this->fetch_array($rs)) {
echo "$i $row[Database]";
echo "<br />";
$i++;
}
}
//以數組形式返回主機中所有數據庫名
public function databases() {
$rsPtr = mysql_list_dbs($this->conn);
$i = 0;
$cnt = mysql_num_rows($rsPtr);
while ($i < $cnt) {
$rs[] = mysql_db_name($rsPtr, $i);
$i++;
}
return $rs;
}
/*查詢數據庫下所有的表*/
public function show_tables($database_name) {
$this->query("show tables");
echo "現有數據庫：" . $amount = $this->db_num_rows($rs);
echo "<br />";
$i = 1;
while ($row = $this->fetch_array($rs)) {
$columnName = "Tables_in_" . $database_name;
echo "$i $row[$columnName]";
echo "<br />";
$i++;
}
}
/*
mysql_fetch_row() array $row[0],$row[1],$row[2]
mysql_fetch_array() array $row[0] 或 $row[id]
mysql_fetch_assoc() array 用$row->content 字段大小寫敏感
mysql_fetch_object() object 用$row[id],$row[content] 字段大小寫敏感
*/
/*取得結果數據*/
public function mysql_result_li() {
return mysql_result($str);
}
/*取得記錄集,獲取數組-索引和關聯,使用$row['content'] */
public function fetch_array() {
return mysql_fetch_array($this->result);
}
//獲取關聯數組,使用$row['字段名']
public function fetch_assoc() {
return mysql_fetch_assoc($this->result);
}
//獲取數字索引數組,使用$row[0],$row[1],$row[2]
public function fetch_row() {
return mysql_fetch_row($this->result);
}
//獲取對象數組,使用$row->content
public function fetch_Object() {
return mysql_fetch_object($this->result);
}
//簡化查詢select
public function findall($table) {
$this->query("SELECT * FROM $table");
}
//簡化查詢select
public function select($table, $columnName = "*", $condition = '', $debug = '') {
$condition = $condition ? ' Where ' . $condition : NULL;
if ($debug) {
echo "SELECT $columnName FROM $table $condition";
} else {
$this->query("SELECT $columnName FROM $table $condition");
}
}
//簡化刪除del
public function delete($table, $condition, $url = '') {
if ($this->query("DELETE FROM $table WHERE $condition")) {
if (!empty ($url))
$this->Get_admin_msg($url, '刪除成功！');
}
}
//簡化插入insert
public function insert($table, $columnName, $value, $url = '') {
if ($this->query("INSERT INTO $table ($columnName) VALUES ($value)")) {
if (!empty ($url))
show_msg($url, '添加成功！');
}
}
//簡化修改update
public function update($table, $mod_content, $condition, $url = '') {
if ($this->query("UPDATE $table SET $mod_content WHERE $condition")) {
if (!empty ($url))
show_msg($url);
}
}
/*取得上一步 INSERT 操作產生的 ID*/
public function insert_id() {
return mysql_insert_id();
}
//指向確定的一條數據記錄
public function db_data_seek($id) {
if ($id > 0) {
$id = $id -1;
}
if (!@ mysql_data_seek($this->result, $id)) {
$this->show_error("SQL語句有誤：", "指定的數據為空");
}
return $this->result;
}
// 根據select查詢結果計算結果集條數
public function db_num_rows() {
if ($this->result == null) {
if ($this->show_error) {
$this->show_error("SQL語句錯誤", "暫時為空，沒有任何內容！");
}
} else {
return mysql_num_rows($this->result);
}
}
// 根據insert,update,delete執行結果取得影響行數
public function db_affected_rows() {
return mysql_affected_rows();
}
//輸出顯示sql語句
public function show_error($message = "", $sql = "") {
if (!$sql) {
echo "<font color='red'>" . $message . "</font>";
echo "<br />";
} else {
echo "<fieldset>";
echo "<legend>錯誤信息提示:</legend><br />";
echo "<div style='font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;'>";
echo "<div style='height:20px; background:#000000; border:1px #000000 solid'>";
echo "<font color='white'>錯誤號：12142</font>";
echo "</div><br />";
echo "錯誤原因：" . mysql_error() . "<br /><br />";
echo "<div style='height:20px; background:#FF0000; border:1px #FF0000 solid'>";
echo "<font color='white'>" . $message . "</font>";
echo "</div>";
echo "<font color='red'><pre>" . $sql . "</pre></font>";
//$ip = $this->getip();
if ($this->bulletin) {
$time = date("Y-m-d H:i:s");
$message = $message . "\r\n$this->sql" . "\r\n客戶IP:$ip" . "\r\n時間 :$time" . "\r\n\r\n";
$server_date = date("Y-m-d");
$filename = $server_date . ".txt";
$file_path = "error/" . $filename;
$error_content = $message;
//$error_content="錯誤的數據庫，不可以鏈接";
$file = "error"; //設置文件保存目錄
//建立文件夾
if (!file_exists($file)) {
if (!mkdir($file, 0777)) {
//默認的 mode 是 0777，意味着最大可能的訪問權
die("upload files directory does not exist and creation failed");
}
}
//建立txt日期文件
if (!file_exists($file_path)) {
//echo "建立日期文件";
fopen($file_path, "w+");
//首先要確定文件存在並且可寫
if (is_writable($file_path)) {
//使用添加模式打開$filename，文件指針將會在文件的開頭
if (!$handle = fopen($file_path, 'a')) {
echo "不能打開文件 $filename";
exit;
}
//將$somecontent寫入到我們打開的文件中。
if (!fwrite($handle, $error_content)) {
echo "不能寫入到文件 $filename";
exit;
}
//echo "文件 $filename 寫入成功";
echo "——錯誤記錄被保存!";
//關閉文件
fclose($handle);
} else {
echo "文件 $filename 不可寫";
}
} else {
//首先要確定文件存在並且可寫
if (is_writable($file_path)) {
//使用添加模式打開$filename，文件指針將會在文件的開頭
if (!$handle = fopen($file_path, 'a')) {
echo "不能打開文件 $filename";
exit;
}
//將$somecontent寫入到我們打開的文件中。
if (!fwrite($handle, $error_content)) {
echo "不能寫入到文件 $filename";
exit;
}
//echo "文件 $filename 寫入成功";
echo "——錯誤記錄被保存!";
//關閉文件
fclose($handle);
} else {
echo "文件 $filename 不可寫";
}
}
}
echo "<br />";
if ($this->is_error) {
exit;
}
}
echo "</div>";
echo "</fieldset>";
echo "<br />";
}
//釋放結果集
public function free() {
@ mysql_free_result($this->result);
}
//數據庫選擇
public function select_db($db_database) {
return mysql_select_db($db_database);
}
//查詢字段數量
public function num_fields($table_name) {
//return mysql_num_fields($this->result);
$this->query("select * from $table_name");
echo "<br />";
echo "字段數：" . $total = mysql_num_fields($this->result);
echo "<pre>";
for ($i = 0; $i < $total; $i++) {
print_r(mysql_fetch_field($this->result, $i));
}
echo "</pre>";
echo "<br />";
}
//取得 MySQL 服務器信息
public function mysql_server($num = '') {
switch ($num) {
case 1 :
return mysql_get_server_info(); //MySQL 服務器信息
break;
case 2 :
return mysql_get_host_info(); //取得 MySQL 主機信息
break;
case 3 :
return mysql_get_client_info(); //取得 MySQL 客戶端信息
break;
case 4 :
return mysql_get_proto_info(); //取得 MySQL 協議信息
break;
default :
return mysql_get_client_info(); //默認取得mysql版本信息
}
}
//析構函數，自動關閉數據庫,垃圾回收機制
public function __destruct() {
if (!empty ($this->result)) {
$this->free();
}
mysql_close($this->conn);
} //function __destruct();
}?>