一个普遍通用的PHP连接MYSQL数据库类
[code lang="php"]
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_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 $this->result;
}
//弹出对话框提示
public function show_msg($url,$show="操作已成功"){
$msg=';
如果浏览器无法跳转，请点击此处';
echo $msg;
exit();
}
//创建添加新的数据库
public function create_database($database_name) {
$database = $database_name;
$sqlDatabase = 'create database ' . $database;
$this->query($sqlDatabase);
}
//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 "
";
$i = 1;
while ($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 $rs;
}
// 查询数据库下所有的表
public function show_tables($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 "
";
$i++;
}
}
//取得结果数据
public function mysql_result_li() {
return mysql_result($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 = '', $debug = '') {
$condition = $condition ? ' Where ' . $condition : NULL;
if ($debug) {
echo "Select $columnName FROM $table $condition";
} else {
$this->query("Select $columnName FROM $table $condition");
}
}
//简化删除del
public function delete($table, $condition, $url = '') {
if ($this->query("Delete FROM $table Where $condition")) {
if (!empty ($url))
$this->show_msg($url, '删除成功！');
}
}
//简化插入insert
public function insert($table, $columnName, $value, $url = '') {
if ($this->query("Insert INTO $table ($columnName) VALUES ($value)")) {
if (!empty ($url))
$this->show_msg($url, '添加成功！');
}
}
//简化修改update
public function update($table, $mod_content, $condition, $url = '') {
if ($this->query("Update $table SET $mod_content Where $condition")) {
if (!empty ($url))
$this->show_msg($url);
}
}
//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();
}?>
query('select * from ly_news'); //调试中使用，sql语句出错时会自动打印出来
echo $connect->show_databases(); //将系统数据库与用户数据库分开，更直观的显示
echo '
';
print_r($connect->databases()); //以数组形式返回主机中所有数据库名
echo '
';
echo $connect->show_tables(data); //带有参数的数据库显示
echo '
';
echo $connect->select('ly_news','','',' ');
echo '
';
//echo $connect->delete("ly_news", "id=9","delete.php");//删除ID内容
//echo $connect->insert("ly_news", "id,title,content","' ','标题','内容'","tianjia.php");//添加内容
//echo $connect->update("ly_news", "title='新标题'", "id=8","update.php"); //更新数据
echo $connect->mysql_server(1); //MySQL 服务器信息
echo '
';
echo $connect->mysql_server(2); //取得 MySQL 客户端信息
echo '
';
echo $connect->mysql_server(3); //取得 MySQL 协议信息
?>
[/code]