本文实例讲述了PHP基于MySQLI函数封装的数据库连接工具类。分享给大家供大家参考,具体如下:
mysql.class.php:
<?phpclass 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 $this->mysqli->affected_rows; }}
使用方法
<?phprequire_once "mysql.class.php";/* 配置连接参数 */$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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希望本文所述对大家PHP程序设计有所帮助。