深入理解php的MySQL连接类
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深入理解php的MySQL连接类,
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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。
<div class="codetitle"><a style="CURSOR: pointer" data="94862" class="copybut" id="copybut94862" onclick="doCopy('code94862')"> 代码如下:
<div class="codebody" id="code94862">
<?
PHP/
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,$this->db_pwd);
}
if(!MysqL_select_db($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)){
$columnName="Tablesin".$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],$row[2]
public function fetch_row()
{
return MysqL_fetch_row($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,$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 "
".$message."";
echo "
";
}else{
echo "
";
echo "";
echo "
";
}
//释放结果集
public function free(){
@
MysqL_free_result($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);
}
}
?>