php连接mysql的封装类(php数据库操作类封装)

发布时间:2022-11-16

本文目录一览:

  1. python如何使用pymysql连接数据库封装类
  2. php连接mysql并做插入操作的代码,采用了类封装,求解错在哪?求高手指教啊
  3. [求个好用的php mysql封装类](#求个好用的php mysql封装类)
  4. php实现mysql封装类示例
  5. PHP访问MYSQL数据库封装类(附函数说明)

python如何使用pymysql连接数据库封装类

  1. python安装目录设定为d:/python34
  2. pymysql安装方法为:解压下载的文件,在cmd中运行: python setup.py install
    • 检验安装安装是否成功的方法:import pymysql。 如果不报错 说明安装成功。
  3. mysql安装目录为D:/phpStudy/MySQL。为避免更多配置问题,可在启动phpstudy后,将其设为系统服务
  4. 基本操作:
    • (1)导入pymysql: import pymysql
    • (2)连接数据库:
      conn = pymysql.connect(host='localhost', user='root', passwd='root', db='ere', charset='utf8')
      
      务必注意各等号前面的内容!charset参数可避免中文乱码
    • (3)获取操作游标:cur = conn.cursor()
    • (4)执行sql语句,插入记录:sta = cur.execute("insert 语句") 执行成功后sta值为1。更新、删除语句与此类似。
    • (5)执行sql语句,查询记录:cur.execute("select语句") 执行成功后cur变量中保存了查询结果记录集,然后再用循环打印结果:
      for each in cur:
          print(each[1].decode('utf-8')) # each[1] 表示当前游标所在行的的第2列值,如果是中文则需要处理编码
      

php连接mysql并做插入操作的代码,采用了类封装,求解错在哪?求高手指教啊

  • $link = mysql_connect($this-host, $this-name, $this-pass, $this-datebase)
    这里不要填database
  • $this->query("insert into $table ($name) value ($value)");
    value改成values

求个好用的php mysql封装类

<?php
class MMySQL {
    protected static $_dbh = null; //静态属性,所有数据库实例共用,避免重复连接数据库
    protected $_dbType = 'mysql';
    protected $_pconnect = true; //是否使用长连接
    protected $_host = 'localhost';
    protected $_port = 3306;
    protected $_user = 'root';
    protected $_pass = 'root';
    protected $_dbName = null; //数据库名
    protected $_sql = false; //最后一条sql语句
    protected $_where = '';
    protected $_order = '';
    protected $_limit = '';
    protected $_field = '*';
    protected $_clear = 0; //状态,0表示查询条件干净,1表示查询条件污染
    protected $_trans = 0; //事务指令数
    /**
     * 初始化类
     * @param array $conf 数据库配置
     */
    public function __construct(array $conf) {
        class_exists('PDO') or die("PDO: class not exists.");
        $this->_host = $conf['host'];
        $this->_port = $conf['port'];
        $this->_user = $conf['user'];
        $this->_pass = $conf['passwd'];
        $this->_dbName = $conf['dbname'];
        //连接数据库
        if (is_null(self::$_dbh)) {
            $this->_connect();
        }
    }
    /**
     * 连接数据库的方法
     */
    protected function _connect() {
        $dsn = $this->_dbType . ':host=' . $this->_host . ';port=' . $this->_port . ';dbname=' . $this->_dbName;
        $options = $this->_pconnect ? array(PDO::ATTR_PERSISTENT => true) : array();
        try {
            $dbh = new PDO($dsn, $this->_user, $this->_pass, $options);
            $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); //设置如果sql语句执行错误则抛出异常,事务会自动回滚
            $dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); //禁用prepared statements的仿真效果(防SQL注入)
        } catch (PDOException $e) {
            die('Connection failed: ' . $e->getMessage());
        }
        $dbh->exec('SET NAMES utf8');
        self::$_dbh = $dbh;
    }
    /**
     * 字段和表名添加 `符号
     * 保证指令中使用关键字不出错 针对mysql
     * @param string $value
     * @return string
     */
    protected function _addChar($value) {
        if ('*' == $value || false !== strpos($value, '(') || false !== strpos($value, '.') || false !== strpos($value, '`')) {
            //如果包含* 或者 使用了sql方法 则不作处理
        } elseif (false === strpos($value, '`')) {
            $value = '`' . trim($value) . '`';
        }
        return $value;
    }
    /**
     * 取得数据表的字段信息
     * @param string $tbName 表名
     * @return array
     */
    protected function _tbFields($tbName) {
        $sql = 'SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME="' . $tbName . '" AND TABLE_SCHEMA="' . $this->_dbName . '"';
        $stmt = self::$_dbh->prepare($sql);
        $stmt->execute();
        $result = $stmt->fetchAll(PDO::FETCH_ASSOC);
        $ret = array();
        foreach ($result as $key => $value) {
            $ret[$value['COLUMN_NAME']] = 1;
        }
        return $ret;
    }
    /**
     * 过滤并格式化数据表字段
     * @param string $tbName 数据表名
     * @param array $data POST提交数据
     * @return array $newdata
     */
    protected function _dataFormat($tbName, $data) {
        if (!is_array($data)) return array();
        $table_column = $this->_tbFields($tbName);
        $ret = array();
        foreach ($data as $key => $val) {
            if (!is_scalar($val)) continue; //值不是标量则跳过
            if (array_key_exists($key, $table_column)) {
                $key = $this->_addChar($key);
                if (is_int($val)) {
                    $val = intval($val);
                } elseif (is_float($val)) {
                    $val = floatval($val);
                } elseif (preg_match('/^\(\w*(\+|\-|\*|\/)?\w*\)$/i', $val)) {
                    // 支持在字段的值里面直接使用其它字段 ,例如 (score+1) (name) 必须包含括号
                    $val = $val;
                } elseif (is_string($val)) {
                    $val = '"' . addslashes($val) . '"';
                }
                $ret[$key] = $val;
            }
        }
        return $ret;
    }
    /**
     * 执行查询 主要针对 SELECT, SHOW 等指令
     * @param string $sql sql指令
     * @return mixed
     */
    protected function _doQuery($sql = '') {
        $this->_sql = $sql;
        $pdostmt = self::$_dbh->prepare($this->_sql); //prepare或者query 返回一个PDOStatement
        $pdostmt->execute();
        $result = $pdostmt->fetchAll(PDO::FETCH_ASSOC);
        return $result;
    }
    /**
     * 执行语句 针对 INSERT, UPDATE 以及DELETE,exec结果返回受影响的行数
     * @param string $sql sql指令
     * @return integer
     */
    protected function _doExec($sql = '') {
        $this->_sql = $sql;
        return self::$_dbh->exec($this->_sql);
    }
    /**
     * 执行sql语句,自动判断进行查询或者执行操作
     * @param string $sql SQL指令
     * @return mixed
     */
    public function doSql($sql = '') {
        $queryIps = 'INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|LOAD DATA|SELECT .* INTO|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK';
        if (preg_match('/^\s*"?(' . $queryIps . ')\s+/i', $sql)) {
            return $this->_doExec($sql);
        } else {
            //查询操作
            return $this->_doQuery($sql);
        }
    }
    /**
     * 获取最近一次查询的sql语句
     * @return String 执行的SQL
     */
    public function getLastSql() {
        return $this->_sql;
    }
    /**
     * 插入方法
     * @param string $tbName 操作的数据表名
     * @param array $data 字段-值的一维数组
     * @return int 受影响的行数
     */
    public function insert($tbName, array $data) {
        $data = $this->_dataFormat($tbName, $data);
        if (!$data) return;
        $sql = "insert into " . $tbName . "(" . implode(',', array_keys($data)) . ") values(" . implode(',', array_values($data)) . ")";
        return $this->_doExec($sql);
    }
    /**
     * 删除方法
     * @param string $tbName 操作的数据表名
     * @return int 受影响的行数
     */
    public function delete($tbName) {
        //安全考虑,阻止全表删除
        if (!trim($this->_where)) return false;
        $sql = "delete from " . $tbName . " " . $this->_where;
        $this->_clear = 1;
        $this->_clear();
        return $this->_doExec($sql);
    }
    /**
     * 更新函数
     * @param string $tbName 操作的数据表名
     * @param array $data 参数数组
     * @return int 受影响的行数
     */
    public function update($tbName, array $data) {
        //安全考虑,阻止全表更新
        if (!trim($this->_where)) return false;
        $data = $this->_dataFormat($tbName, $data);
        if (!$data) return;
        $valArr = '';
        foreach ($data as $k => $v) {
            $valArr[] = $k . '=' . $v;
        }
        $valStr = implode(',', $valArr);
        $sql = "update " . trim($tbName) . " set " . trim($valStr) . " " . trim($this->_where);
        return $this->_doExec($sql);
    }
    /**
     * 查询函数
     * @param string $tbName 操作的数据表名
     * @return array 结果集
     */
    public function select($tbName = '') {
        $sql = "select " . trim($this->_field) . " from " . $tbName . " " . trim($this->_where) . " " . trim($this->_order) . " " . trim($this->_limit);
        $this->_clear = 1;
        $this->_clear();
        return $this->_doQuery(trim($sql));
    }
    /**
     * @param mixed $option 组合条件的二维数组,例:$option['field1'] = array(1,'=','or')
     * @return $this
     */
    public function where($option) {
        if ($this->_clear == 0) $this->_clear();
        $this->_where = ' where ';
        $logic = 'and';
        if (is_string($option)) {
            $this->_where .= $option;
        } elseif (is_array($option)) {
            foreach ($option as $k => $v) {
                if (is_array($v)) {
                    $relative = isset($v[1]) ? $v[1] : '=';
                    $logic = isset($v[2]) ? $v[2] : 'and';
                    $condition = ' (' . $this->_addChar($k) . ' ' . $relative . ' ' . $v[0] . ') ';
                } else {
                    $logic = 'and';
                    $condition = ' (' . $this->_addChar($k) . '=' . $v . ') ';
                }
                $this->_where .= isset($mark) ? $logic . $condition : $condition;
                $mark = 1;
            }
        }
        return $this;
    }
    /**
     * 设置排序
     * @param mixed $option 排序条件数组 例:array('sort'='desc')
     * @return $this
     */
    public function order($option) {
        if ($this->_clear == 0) $this->_clear();
        $this->_order = ' order by ';
        if (is_string($option)) {
            $this->_order .= $option;
        } elseif (is_array($option)) {
            foreach ($option as $k => $v) {
                $order = $this->_addChar($k) . ' ' . $v;
                $this->_order .= isset($mark) ? ',' . $order : $order;
                $mark = 1;
            }
        }
        return $this;
    }
    /**
     * 设置查询行数及页数
     * @param int $page pageSize不为空时为页数,否则为行数
     * @param int $pageSize 为空则函数设定取出行数,不为空则设定取出行数及页数
     * @return $this
     */
    public function limit($page, $pageSize = null) {
        if ($this->_clear == 0) $this->_clear();
        if ($pageSize === null) {
            $this->_limit = "limit " . $page;
        } else {
            $pageval = intval(($page - 1) * $pageSize);
            $this->_limit = "limit " . $pageval . "," . $pageSize;
        }
        return $this;
    }
    /**
     * 设置查询字段
     * @param mixed $field 字段数组
     * @return $this
     */
    public function field($field) {
        if ($this->_clear == 0) $this->_clear();
        if (is_string($field)) {
            $field = explode(',', $field);
        }
        $nField = array_map(array($this, '_addChar'), $field);
        $this->_field = implode(',', $nField);
        return $this;
    }
    /**
     * 清理标记函数
     */
    protected function _clear() {
        $this->_where = '';
        $this->_order = '';
        $this->_limit = '';
        $this->_field = '*';
        $this->_clear = 0;
    }
    /**
     * 手动清理标记
     * @return $this
     */
    public function clearKey() {
        $this->_clear();
        return $this;
    }
    /**
     * 启动事务
     * @return void
     */
    public function startTrans() {
        //数据rollback 支持
        if ($this->_trans == 0) self::$_dbh->beginTransaction();
        $this->_trans++;
        return;
    }
    /**
     * 用于非自动提交状态下面的查询提交
     * @return boolen
     */
    public function commit() {
        $result = true;
        if ($this->_trans > 0) {
            $result = self::$_dbh->commit();
            $this->_trans = 0;
        }
        return $result;
    }
    /**
     * 事务回滚
     * @return boolen
     */
    public function rollback() {
        $result = true;
        if ($this->_trans > 0) {
            $result = self::$_dbh->rollback();
            $this->_trans = 0;
        }
        return $result;
    }
    /**
     * 关闭连接
     * PHP 在脚本结束时会自动关闭连接。
     */
    public function close() {
        if (!is_null(self::$_dbh)) self::$_dbh = null;
    }
}
?>

php实现mysql封装类示例

<?php
class Mysql {
    private $host;
    private $user;
    private $pwd;
    private $dbName;
    private $charset;
    private $conn = null;
    public function __construct() {
        $this->host = 'localhost';
        $this->user = 'root';
        $this->pwd = 'root';
        $this->dbName = 'test';
        $this->connect($this->host, $this->user, $this->pwd);
        $this->switchDb($this->dbName);
        $this->setChar($this->charset);
    }
    //负责链接
    private function connect($h, $u, $p) {
        $conn = mysql_connect($h, $u, $p);
        $this->conn = $conn;
    }
    //负责切换数据库
    public function switchDb($db) {
        $sql = 'use ' . $db;
        $this->query($sql);
    }
    //负责设置字符集
    public function setChar($char) {
        $sql = 'set names ' . $char;
        $this->query($sql);
    }
    //负责发送sql查询
    public function query($sql) {
        return mysql_query($sql, $this->conn);
    }
    //负责获取多行多列的select结果
    public function getAll($sql) {
        $list = array();
        $rs = $this->query($sql);
        if (!$rs) {
            return false;
        }
        while ($row = mysql_fetch_assoc($rs)) {
            $list[] = $row;
        }
        return $list;
    }
    public function getRow($sql) {
        $rs = $this->query($sql);
        if (!$rs) {
            return false;
        }
        return mysql_fetch_assoc($rs);
    }
    public function getOne($sql) {
        $rs = $this->query($sql);
        if (!$rs) {
            return false;
        }
        $row = mysql_fetch_assoc($rs);
        return $row[0];
    }
    public function close() {
        mysql_close($this->conn);
    }
}
echo '<pre>';
$mysql = new Mysql();
print_r($mysql);
$sql = "insert into stu values (4,'wangwu','99998')";
if ($mysql->query($sql)) {
    echo "query成功";
} else {
    echo "失败";
}
echo "<br/>";
$sql = "select * from stu";
$arr = $mysql->getAll($sql);
print_r($arr);
?>

PHP访问MYSQL数据库封装类(附函数说明)

<?php
/*
MYSQL数据库访问封装类
MYSQL数据访问方式,php4支持以mysql_开头的过程访问方式,php5开始支持以mysqli_开头的过程和mysqli面向对象
访问方式,本封装类以mysql_封装
数据访问的一般流程:
1,连接数据库 mysql_connect or mysql_pconnect
2,选择数据库 mysql_select_db
3,执行SQL查询 mysql_query
4,处理返回的数据 mysql_fetch_array mysql_num_rows mysql_fetch_assoc mysql_fetch_row etc
*/
class db_mysql {
    var $querynum = 0; //当前页面进程查询数据库的次数
    var $dblink; //数据库连接资源
    //链接数据库
    function connect($dbhost, $dbuser, $dbpw, $dbname = '', $dbcharset = 'utf-8', $pconnect = 0, $halt = true) {
        $func = empty($pconnect) ? 'mysql_connect' : 'mysql_pconnect';
        $this->dblink = @$func($dbhost, $dbuser, $dbpw);
        if ($halt && !$this->dblink) {
            $this->halt("无法链接数据库!");
        }
        //设置查询字符集
        mysql_query("SET character_set_connection={$dbcharset},character_set_results={$dbcharset},character_set_client=binary", $this->dblink);
        //选择数据库
        $dbname && @mysql_select_db($dbname, $this->dblink);
    }
    //选择数据库
    function select_db($dbname) {
        return mysql_select_db($dbname, $this->dblink);
    }
    //执行SQL查询
    function query($sql) {
        $this->querynum++;
        return mysql_query($sql, $this->dblink);
    }
    //返回最近一次与连接句柄关联的INSERT,UPDATE 或DELETE 查询所影响的记录行数
    function affected_rows() {
        return mysql_affected_rows($this->dblink);
    }
    //取得结果集中行的数目,只对select查询的结果集有效
    function num_rows($result) {
        return mysql_num_rows($result);
    }
    //获得单格的查询结果
    function result($result, $row = 0) {
        return mysql_result($result, $row);
    }
    //取得上一步 INSERT 操作产生的 ID,只对表有AUTO_INCREMENT ID的操作有效
    function insert_id() {
        return ($id = mysql_insert_id($this->dblink)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0);
    }
    //从结果集提取当前行,以数字为key表示的关联数组形式返回
    function fetch_row($result) {
        return mysql_fetch_row($result);
    }
    //从结果集提取当前行,以字段名为key表示的关联数组形式返回
    function fetch_assoc($result) {
        return mysql_fetch_assoc($result);
    }
    //从结果集提取当前行,以字段名和数字为key表示的关联数组形式返回
    function fetch_array($result) {
        return mysql_fetch_array($result);
    }
    //关闭链接
    function close() {
        return mysql_close($this->dblink);
    }
    //输出简单的错误html提示信息并终止程序
    function halt($msg) {
        $message = "<html>\n<head>\n";
        $message .= "<meta content='text/html;charset=gb2312'>\n";
        $message .= "</head>\n";
        $message .= "<body>\n";
        $message .= "数据库出错:" . htmlspecialchars($msg) . "\n";
        $message .= "</body>\n";
        $message .= "</html>";
        echo $message;
        exit;
    }
}
?>