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：

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

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';

希望本文所述对大家PHP程序设计有所帮助。