PHP MySQL数据库操作类详解

经测试代码如下：

<?PHP
            /*
            *           无论做什么都要无私，只有大家好才是真的好，如果使用有任何问题请联系告知本人，交流就是相互促进的大舞台。
            */
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{
//即使链接
$this->conn=MysqL_connect($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(){
$this->query("show databases");
echo "现有数据库：".$amount =$this->db_num_rows($rs);
echo "<br />";
$i=1;
while($row = $this->fetch_array($rs)){
echo "$i $row[Database]";
echo "<br />";
$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 "<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");

}

function insert($table,$values) {
$table = $this->fulltablename($table);
$sql = "INSERT INTO {$table}";
$keysql = '';
$valuesql = '';
foreach($values as $key => $value) {
$keysql .= "`$key`,";
$valuesql .= "'".ak_addslashes($value)."',";
}
$sql = $sql.'('.substr($keysql,-1).')VALUES('.substr($valuesql,-1).')';
return $this->query($sql);
}

function update($table,$values,$where) {
$table = $this->fulltablename($table);
$sql = "UPDATE {$table} SET ";
$keysql = '';
$valuesql = '';
foreach($values as $k => $v) {
if(substr($v,1) == '+' && a_is_int(substr($v,1))) {
$sql .= "`$k`={$k}{$v},";
} else {
$sql .= "`$k`='".ak_addslashes($v)."',";
}
}
$sql = substr($sql,-1);
$sql .= " WHERE {$where}";
return $this->query($sql);
}

function delete($table,$where = '') {
$table = $this->fulltablename($table);
$sql = "DELETE FROM {$table}";
if($where != '') $sql .= " WHERE {$where}";
return $this->query($sql);
}


/*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();
}


//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 $table_name");
echo "<br />";
echo "字段数：".$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();

function show_error($str,$str1){

echo $str."<br>".$str1;

}

/*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);
}


}
?>


/***   代码来自编程之家 jb51.cc（jb51.cc）   ***/
PHP MySQL数据库操作类详解

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