pdo类的使用

使用方法

2.php

<?php

require_once "./mypdo.php";

//do something...

//查一行
$id = 3;
//$sql = "select * from tp_goods where id={$id}";
$sql = "select id,goods_name,goods_code,og_thumb,shop_price
from tp_goods where id={$id}";
$data = $pdo->query($sql, $queryMode = 'Row', $debug = false);
if ($data) {
    echo "<pre>";
    var_dump($data);
} else {
    echo "空";
}

//查多行
$id = 3;
$sql = "select * from tp_goods where id<{$id}";
$data = $pdo->query($sql, $queryMode = 'All', $debug = false);
echo "<pre>";
print_r($data);

//插入 返回新插入的主键id

$attr_name = 'test';
$attr_type = 1;
$attr_values = 'red,green';
$type_id = 2;

$data = [
    'attr_name' => $attr_name,
    'attr_type' => $attr_type,
    'attr_values' => $attr_values,
    'type_id' => $type_id,
];
$res = $pdo->insertId("tp_attr", $data, $debug = false);

if ($res) {
    echo ('ok');
    echo ("<br>");
    echo ($res);
} else {
    echo "空";
    echo $res;
}

//更新

$id = 23;
$where = "id=$id";
$attr_values = 'red,green22';
$type_id = 67;
$data = [
    'attr_values' => $attr_values,
    'type_id' => $type_id,
];
$res = $pdo->update("tp_attr", $data, $where, $debug = false);

if ($res) {
    echo ($res);
} else {
    echo "空";
    echo $res;
}

//删除
$id = 29;
$where = "id>$id";
$res = $pdo->delete("tp_attr", $where, $debug = false);

if ($res) {
    echo ($res);
} else {
    echo "空";
    echo $res;
}

$pdo->destruct();

mypdo.php

<?php

$pdo = DAOPDO::getInstance('localhost', 'root', 'root', 'tpshop', 'utf8');

class DAOPDO
{
    protected static $_instance = null;
    protected $dbName = '';
    protected $dsn;
    protected $dbh;

    /**
     * 构造
     *
     * @return DAOPDO
     */
    private function __construct($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset)
    {
        try {
            $this->dsn = 'mysql:host=' . $dbHost . ';dbname=' . $dbName;
            $this->dbh = new PDO($this->dsn, $dbUser, $dbPasswd);
            $this->dbh->exec('SET character_set_connection=' . $dbCharset . ', character_set_results=' . $dbCharset . ', character_set_client=binary');
        } catch (PDOException $e) {
            $this->outputError($e->getMessage());
        }
    }

    /**
     * 防止克隆
     *
     */
    private function __clone()
    {}

    /**
     * Singleton instance
     *
     * @return Object
     */
    public static function getInstance($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset)
    {
        if (self::$_instance === null) {
            self::$_instance = new self($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset);
        }
        return self::$_instance;
    }

    /**
     * Query 查询
     *
     * @param String $strSql SQL语句
     * @param String $queryMode 查询方式(All or Row)
     * @param Boolean $debug
     * @return Array
     */
    public function query($strSql, $queryMode = 'All', $debug = false)
    {
        if ($debug === true) {
            $this->debug($strSql);
        }

        $recordset = $this->dbh->query($strSql);
        $this->getPDOError();
        if ($recordset) {
            $recordset->setFetchMode(PDO::FETCH_ASSOC);
            if ($queryMode == 'All') {
                $result = $recordset->fetchAll();
            } elseif ($queryMode == 'Row') {
                $result = $recordset->fetch();
            }
        } else {
            $result = null;
        }
        return $result;
    }

    /**
     * Update 更新
     *
     * @param String $table 表名
     * @param Array $arrayDataValue 字段与值
     * @param String $where 条件
     * @param Boolean $debug
     * @return Int
     */
    public function update($table, $arrayDataValue, $where = '', $debug = false)
    {
        $this->checkFields($table, $arrayDataValue);
        if ($where) {
            $strSql = '';
            foreach ($arrayDataValue as $key => $value) {
                $strSql .= ", `$key`='$value'";
            }
            $strSql = substr($strSql, 1);
            $strSql = "UPDATE `$table` SET $strSql WHERE $where";
        } else {
            $strSql = "REPLACE INTO `$table` (`" . implode('`,`', array_keys($arrayDataValue)) . "`) VALUES ('" . implode("','", $arrayDataValue) . "')";
        }
        if ($debug === true) {
            $this->debug($strSql);
        }

        $result = $this->dbh->exec($strSql);
        $this->getPDOError();
        return $result;
    }

    /**
     * Insert 插入 返回受影响的行数
     *
     * @param String $table 表名
     * @param Array $arrayDataValue 字段与值
     * @param Boolean $debug
     * @return Int
     */
    public function insert($table, $arrayDataValue, $debug = false)
    {
        $this->checkFields($table, $arrayDataValue);
        $strSql = "INSERT INTO `$table` (`" . implode('`,`', array_keys($arrayDataValue)) . "`) VALUES ('" . implode("','", $arrayDataValue) . "')";
        if ($debug === true) {
            $this->debug($strSql);
        }

        $result = $this->dbh->exec($strSql);
        // $act_id = $this->dbh->lastInsertId(); //获取最新插入的数据的id
        $this->getPDOError();

        return $result;
    }

    /**
     * Insert 插入 返回新插入的主键id
     *
     * @param String $table 表名
     * @param Array $arrayDataValue 字段与值
     * @param Boolean $debug
     * @return Int
     */
    public function insertId($table, $arrayDataValue, $debug = false)
    {
        $this->checkFields($table, $arrayDataValue);
        $strSql = "INSERT INTO `$table` (`" . implode('`,`', array_keys($arrayDataValue)) . "`) VALUES ('" . implode("','", $arrayDataValue) . "')";
        if ($debug === true) {
            $this->debug($strSql);
        }

        $result = $this->dbh->exec($strSql);
        $act_id = $this->dbh->lastInsertId(); //获取最新插入的数据的id
        $this->getPDOError();

        return $act_id;
    }

    /**
     * Replace 覆盖方式插入
     *
     * @param String $table 表名
     * @param Array $arrayDataValue 字段与值
     * @param Boolean $debug
     * @return Int
     */
    public function replace($table, $arrayDataValue, $debug = false)
    {
        $this->checkFields($table, $arrayDataValue);
        $strSql = "REPLACE INTO `$table`(`" . implode('`,`', array_keys($arrayDataValue)) . "`) VALUES ('" . implode("','", $arrayDataValue) . "')";
        if ($debug === true) {
            $this->debug($strSql);
        }

        $result = $this->dbh->exec($strSql);
        $this->getPDOError();
        return $result;
    }

    /**
     * Delete 删除
     *
     * @param String $table 表名
     * @param String $where 条件
     * @param Boolean $debug
     * @return Int
     */
    public function delete($table, $where = '', $debug = false)
    {
        if ($where == '') {
            $this->outputError("'WHERE' is Null");
        } else {
            $strSql = "DELETE FROM `$table` WHERE $where";
            if ($debug === true) {
                $this->debug($strSql);
            }

            $result = $this->dbh->exec($strSql);
            $this->getPDOError();
            return $result;
        }
    }

    /**
     * execSql 执行SQL语句,debug=>true可打印sql调试
     *
     * @param String $strSql
     * @param Boolean $debug
     * @return Int
     */
    public function execSql($strSql, $debug = false)
    {
        if ($debug === true) {
            $this->debug($strSql);
        }

        $result = $this->dbh->exec($strSql);
        $this->getPDOError();
        return $result;
    }

    /**
     * 获取字段最大值
     *
     * @param string $table 表名
     * @param string $field_name 字段名
     * @param string $where 条件
     */
    public function getMaxValue($table, $field_name, $where = '', $debug = false)
    {
        $strSql = "SELECT MAX(" . $field_name . ") AS MAX_VALUE FROM $table";
        if ($where != '') {
            $strSql .= " WHERE $where";
        }

        if ($debug === true) {
            $this->debug($strSql);
        }

        $arrTemp = $this->query($strSql, 'Row');
        $maxValue = $arrTemp["MAX_VALUE"];
        if ($maxValue == "" || $maxValue == null) {
            $maxValue = 0;
        }
        return $maxValue;
    }

    /**
     * 获取指定列的数量
     *
     * @param string $table
     * @param string $field_name
     * @param string $where
     * @param bool $debug
     * @return int
     */
    public function getCount($table, $field_name, $where = '', $debug = false)
    {
        $strSql = "SELECT COUNT($field_name) AS NUM FROM $table";
        if ($where != '') {
            $strSql .= " WHERE $where";
        }

        if ($debug === true) {
            $this->debug($strSql);
        }

        $arrTemp = $this->query($strSql, 'Row');
        return $arrTemp['NUM'];
    }

    /**
     * 获取表引擎
     *
     * @param String $dbName 库名
     * @param String $tableName 表名
     * @param Boolean $debug
     * @return String
     */
    public function getTableEngine($dbName, $tableName)
    {
        $strSql = "SHOW TABLE STATUS FROM $dbName WHERE Name='" . $tableName . "'";
        $arrayTableInfo = $this->query($strSql);
        $this->getPDOError();
        return $arrayTableInfo[0]['Engine'];
    }
    //预处理执行
    public function prepareSql($sql = '')
    {
        return $this->dbh->prepare($sql);
    }
    //执行预处理
    public function execute($presql)
    {
        return $this->dbh->execute($presql);
    }

/**
 * pdo属性设置
 */
    public function setAttribute($p, $d)
    {
        $this->dbh->setAttribute($p, $d);
    }

    /**
     * beginTransaction 事务开始
     */
    public function beginTransaction()
    {
        $this->dbh->beginTransaction();
    }

    /**
     * commit 事务提交
     */
    public function commit()
    {
        $this->dbh->commit();
    }

    /**
     * rollback 事务回滚
     */
    public function rollback()
    {
        $this->dbh->rollback();
    }

    /**
     * transaction 通过事务处理多条SQL语句
     * 调用前需通过getTableEngine判断表引擎是否支持事务
     *
     * @param array $arraySql
     * @return Boolean
     */
    public function execTransaction($arraySql)
    {
        $retval = 1;
        $this->beginTransaction();
        foreach ($arraySql as $strSql) {
            if ($this->execSql($strSql) == 0) {
                $retval = 0;
            }

        }
        if ($retval == 0) {
            $this->rollback();
            return false;
        } else {
            $this->commit();
            return true;
        }
    }

    /**
     * checkFields 检查指定字段是否在指定数据表中存在
     *
     * @param String $table
     * @param array $arrayField
     */
    private function checkFields($table, $arrayFields)
    {
        $fields = $this->getFields($table);
        foreach ($arrayFields as $key => $value) {
            if (!in_array($key, $fields)) {
                $this->outputError("Unknown column `$key` in field list.");
            }
        }
    }

    /**
     * getFields 获取指定数据表中的全部字段名
     *
     * @param String $table 表名
     * @return array
     */
    private function getFields($table)
    {
        $fields = array();
        $recordset = $this->dbh->query("SHOW COLUMNS FROM $table");
        $this->getPDOError();
        $recordset->setFetchMode(PDO::FETCH_ASSOC);
        $result = $recordset->fetchAll();
        foreach ($result as $rows) {
            $fields[] = $rows['Field'];
        }
        return $fields;
    }

    /**
     * getPDOError 捕获PDO错误信息
     */
    private function getPDOError()
    {
        if ($this->dbh->errorCode() != '00000') {
            $arrayError = $this->dbh->errorInfo();
            $this->outputError($arrayError[2]);
        }
    }

    /**
     * debug
     *
     * @param mixed $debuginfo
     */
    private function debug($debuginfo)
    {
        var_dump($debuginfo);
        exit();
    }

    /**
     * 输出错误信息
     *
     * @param String $strErrMsg
     */
    private function outputError($strErrMsg)
    {
        throw new Exception('MySQL Error: ' . $strErrMsg);
    }

    /**
     * destruct 关闭数据库连接
     */
    public function destruct()
    {
        $this->dbh = null;
    }
    /**
     *PDO执行sql语句,返回改变的条数
     *如需调试可选用execSql($sql,true)
     */
    public function exec($sql = '')
    {
        return $this->dbh->exec($sql);
    }
}