php mysqli封装类,PHP基于MySQLI函数封装的数据库连接工具类【定义与用法】
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";
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