<?php class mysql { private $mysqli; private $result; /** * 数据库连接 * @param $config 配置数组 */ public function connect($config) { $host = $config['host']; //主机地址 $username = $config['username'];//用户名 $password = $config['password'];//密码 $database = $config['database'];//数据库 $port = $config['port']; //端口号 $this->mysqli = new mysqli($host, $username, $password, $database, $port); } /** * 数据查询 * @param $table 数据表 * @param null $field 字段 * @param null $where 条件 * @return mixed 查询结果数目 */ public function select($table, $field = null, $where = null) { $sql = "SELECT * FROM {$table}"; if (!empty($field)) { $field = '`' . implode('`,`', $field) . '`'; $sql = str_replace('*', $field, $sql); } if (!empty($where)) { $sql = $sql . ' WHERE ' . $where; } $this->result = $this->mysqli->query($sql); return $this->result->num_rows; } /** * @return mixed 获取全部结果 */ public function fetchAll() { return $this->result->fetch_all(MYSQLI_ASSOC); } /** * 插入数据 * @param $table 数据表 * @param $data 数据数组 * @return mixed 插入ID */ public function insert($table, $data) { foreach ($data as $key => $value) { $data[$key] = $this->mysqli->real_escape_string($value); } $keys = '`' . implode('`,`', array_keys($data)) . '`'; $values = '\'' . implode("','", array_values($data)) . '\''; $sql = "INSERT INTO {$table}( {$keys} )VALUES( {$values} )"; $this->mysqli->query($sql); return $this->mysqli->insert_id; } /** * 更新数据 * @param $table 数据表 * @param $data 数据数组 * @param $where 过滤条件 * @return mixed 受影响记录 */ public function update($table, $data, $where) { foreach ($data as $key => $value) { $data[$key] = $this->mysqli->real_escape_string($value); } $sets = array(); foreach ($data as $key => $value) { $kstr = '`' . $key . '`'; $vstr = '\'' . $value . '\''; array_push($sets, $kstr . '=' . $vstr); } $kav = implode(',', $sets); $sql = "UPDATE {$table} SET {$kav} WHERE {$where}"; $this->mysqli->query($sql); return $this->mysqli->affected_rows; } /** * 删除数据 * @param $table 数据表 * @param $where 过滤条件 * @return mixed 受影响记录 */ public function delete($table, $where) { $sql = "DELETE FROM {$table} WHERE {$where}"; $this->mysqli->query($sql); return $this->mysqli->affected_rows; } }
使用方法
<?php require_once 'mysql.class.php'; /* 配置连接参数 */ $config = array( 'type' => 'mysql', 'host' => 'localhost', 'username' => 'woider', 'password' => '3243', 'database' => 'php', 'port' => '3306' ); /* 连接数据库 */ $mysql = new mysql(); $mysql->connect($config); /* 查询数据 */ //1、查询所有数据 $table = 'mysqli';//数据表 $num = $mysql->select($table); echo '共查询到' . $num . '条数据'; print_r($mysql->fetchAll()); //2、查询部分数据 $field = array('username', 'password'); //过滤字段 $where = 'id % 2 =0'; //过滤条件 $mysql->select($table, $field, $where); print_r($mysql->fetchAll()); /* 插入数据 */ $table = 'mysqli';//数据表 $data = array( //数据数组 'username' => 'admin', 'password' => sha1('admin') ); $id = $mysql->insert($table, $data); echo '插入记录的ID为' . $id; /* 修改数据 */ $table = 'mysqli';//数据表 $data = array( 'password' => sha1('nimda') ); $where = 'id = 44'; $rows = $mysql->update($table, $data, $where); echo '受影响的记录数量为' . $rows . '条'; /* 删除数据 */ $table = 'mysqli'; $where = 'id = 45'; $rows = $mysql->delete($table, $where); echo '已删除' . $rows . '条数据';
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