本文目录一览:
- python如何使用pymysql连接数据库封装类
- 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
- [求个好用的php mysql封装类](#求个好用的php mysql封装类)
- php实现mysql封装类示例
- 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
- python安装目录设定为d:/python34
- 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。
- 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
- 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;
}
}
?>