无意间在电脑里发现还有这么个Mysql的连接类，也不记得哪里收藏的了，贴上来吧。
后面几个show_databases和show_tables....等方法都用了一堆echo，好像一直不喜欢在类的方法里直接用输出语句，不过这也只是列举数据库和表名，构造函数的参数也可以给个默认值吧。
代码如下:
/*
* filename：mysql数据库连接类
*/
class mysql{
private $db_host; //数据库主机
private $db_user; //数据库用户名
private $db_pwd; //数据库用户名密码
private $db_database; //数据库名
private $conn; //数据库连接标识;
private $result; //执行query命令的结果资源标识
private $sql; //sql执行语句
private $row; //返回的条目数
private $coding; //数据库编码，GBK,UTF8,gb2312
private $bulletin = true; //是否开启错误记录
private $show_error = true; //测试阶段，显示所有错误,具有安全隐患,默认关闭
private $is_error = false; //发现错误是否立即终止,默认true,建议不启用，因为当有问题时用户什么也看不到是很苦恼的
/*构造函数*/
public function __construct($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;
$this->connect();
}
/*数据库连接*/
public function connect()
{
if($this->conn=="pconn"){
//永久链接
$this->conn=mysql_pconnect($this->db_host,$this->db_user,$this->db_pwd);
}else{
//即时链接
$this->conn=mysql_connect($this->db_host,$this->db_user,$this->db_pwd);
}
if(!mysql_select_db($this->db_database,$this->conn)){
if($this->show_error){
$this->show_error("数据库不可用：",$this->db_database);
}
}
mysql_query("SET NAMES $this->coding");
}
/*数据库执行语句，可执行查询添加修改删除等任何sql语句*/
public function query($sql)
{
if($sql == ""){
$this->show_error("sql语句错误：","sql查询语句为空");}
$this->sql = $sql;
$result = mysql_query($this->sql,$this->conn);
if(!$result){
//调试中使用，sql语句出错时会自动打印出来
if($this->show_error){
$this->show_error("错误sql语句：",$this->sql);
}
}else{
$this->result = $result;
}
return $this->result;
}
/*创建添加新的数据库*/
public function create_database($database_name){
$database=$database_name;
$sqlDatabase = 'create database '.$database;
$this->query($sqlDatabase);
}
/*查询服务器所有数据库*/
//将系统数据库与用户数据库分开，更直观的显示？
public function show_databases(){
$rs=$this->query("show databases");
echo "现有数据库：".$amount =$this->db_num_rows($rs);
echo "
";
$i=1;
while($row = $this->fetch_array($rs)){
echo "$i $row[Database]";
echo "
";
$i++;
}
}
//以数组形式返回主机中所有数据库名
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 $rs;
}
/*查询数据库下所有的表*/
function show_tables($database_name){
$this->query("show tables");
echo "现有数据库：".$amount = $this->db_num_rows($rs);
echo "
";
$i=1;
while($row = $this->fetch_array($rs)){
$columnName="Tables_in_".$database_name;
echo "$i $row[$columnName]";
echo "
";
$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 字段大小写敏感
mysql_fetch_object() object 用$row[id],$row[content] 字段大小写敏感
*/
/*取得结果数据*/
public function mysql_result_li()
{
return mysql_result($str);
}
/*取得记录集,获取数组-索引和关联,使用$row['content'] */
public function fetch_array()
{
return mysql_fetch_array($this->result);
}
//获取关联数组,使用$row['字段名']
public function fetch_assoc()
{
return mysql_fetch_assoc($this->result);
}
//获取数字索引数组,使用$row[0],$row[1],$row[2]
public function fetch_row()
{
return mysql_fetch_row($this->result);
}
//获取对象数组,使用$row->content
public function fetch_Object()
{
return mysql_fetch_object($this->result);
}
//简化查询select
public function findall($table)
{
$this->query("SELECT * FROM $table");
}
//简化查询select
public function select($table,$columnName,$condition)
{
if($columnName==""){
$columnName="*";
}
$this->query("SELECT $columnName FROM $table $condition");
}
//简化删除del
public function delete($table,$condition){
$this->query("DELETE FROM $table WHERE $condition");
}
//简化插入insert
public function insert($table,$columnName,$value){
$this->query("INSERT INTO $table ($columnName) VALUES ($value)");
}
//简化修改update
public function update($table,$mod_content,$condition){
$this->query("UPDATE $table SET $mod_content WHERE $condition");
}
/*取得上一步 INSERT 操作产生的 ID*/
public function insert_id(){
return mysql_insert_id();
}
//指向确定的一条数据记录
public function db_data_seek($id){
if($id>0){
$id=$id-1;
}
if(!@mysql_data_seek($this->result,$id)){
$this->show_error("sql语句有误：", "指定的数据为空");
}
return $this->result;
}
// 根据select查询结果计算结果集条数
public function db_num_rows(){
if($this->result==null){
if($this->show_error){
$this->show_error("sql语句错误","暂时为空，没有任何内容！");
}
}else{
return mysql_num_rows($this->result);
}
}
// 根据insert,update,delete执行结果取得影响行数
public function db_affected_rows(){
return mysql_affected_rows();
}
//输出显示sql语句
public function show_error($message="",$sql=""){
if(!$sql){
echo "
".$message."";
echo "
";
}else{
echo "
";
echo "
";
}
//释放结果集
public function free(){
@mysql_free_result($this->result);
}
//数据库选择
public function select_db($db_database){
return mysql_select_db($db_database);
}
//查询字段数量
public function num_fields($table_name){
//return mysql_num_fields($this->result);
$this->query("select * from $table_name");
echo "
";
echo "字段数：".$total = mysql_num_fields($this->result);
echo "
";
for ($i=0; $i<$total; $i++){
print_r(mysql_fetch_field($this->result,$i) );
}
echo "
";
echo "
";
}
//取得 MySQL 服务器信息
public function mysql_server($num=''){
switch ($num){
case 1 :
return mysql_get_server_info(); //MySQL 服务器信息
break;
case 2 :
return mysql_get_host_info(); //取得 MySQL 主机信息
break;
case 3 :
return mysql_get_client_info(); //取得 MySQL 客户端信息
break;
case 4 :
return mysql_get_proto_info(); //取得 MySQL 协议信息
break;
default:
return mysql_get_client_info(); //默认取得mysql版本信息
}
}
//析构函数，自动关闭数据库,垃圾回收机制
public function __destruct()
{
if(!empty($this->result)){
$this->free();
}
mysql_close($this->conn);
}//function __destruct();
/*获得客户端真实的IP地址*/
function getip(){
if(getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
{
$ip = getenv("HTTP_CLIENT_IP");
}
else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")){
$ip = getenv("HTTP_X_FORWARDED_FOR");
}
else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
{
$ip = getenv("REMOTE_ADDR");
}
else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")){
$ip = $_SERVER['REMOTE_ADDR'];
}
else{
$ip = "unknown";
}
return($ip);
}
}
?>
