本文实例讲述了PHP数据库表操作的封装类及用法。分享给大家供大家参考,具体如下:
数据库表结构:
CREATE TABLE `test_user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(45) NOT NULL, `password` varchar(45) NOT NULL, `nickname` varchar(45) NOT NULL, `r` tinyint(4) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE `test_blog` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `title` varchar(45) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
设置字符编码:
header('Content-Type: text/html; charset=utf-8');
引入Table类:
require 'Table.php';
设置数据库参数:
Table::$__host = '127.0.0.1:3306'; Table::$__user = 'root'; Table::$__pass = '123456'; Table::$__name = 'test'; Table::$__charset = 'utf8';
创建实体对象:
Table类有三个参数: $table, $pk, $pdo=null
$table: 表名称.
$pk: 主键名称. 不支持联合主键
$pdo: 独立的PDO对象. 一般不需要传
Notice: Table类是表操作的封装,不是Model层的基类,所以不支持表前缀,表前缀应该在Model层实现
$userTable = new Table('test_blog'); $blogTable = new Table('test_blog');
插入数据:
$user = array( 'username' => "admin1", 'password' => "admin1", 'nickname' => "管理员1", 'r' => mt_rand(0, 5), ); echo $userTable->insert($user)->rowCount(), "\n"; echo $userTable->lastInsertId(), "\n";
批量插入数据:
$fields = array('username','password','nickname','r'); for ($i=2; $i<=100; $i++) { $rows[] = array("admin$i", "admin$i", "管理员$i", mt_rand(0, 5)); } $userTable->batchInsert($fields, $rows);
查询所有数据:
select方法返回一个PDOStatement对象, fetchAll返回多行, fetch返回单行
var_dump($userTable->select()->fetchAll());
field自定义:
var_dump($userTable->select('id,nickname')->fetchAll());
where查询:
var_dump($userTable->where('id > "htmlcode">var_dump($userTable->where('id > "htmlcode">var_dump($userTable->where('id = "htmlcode">var_dump($userTable->group('r')->having('c between "htmlcode">var_dump($userTable->order('r desc, id')->select()->fetchAll());limit 行数:
跳过30行 返回10行
var_dump($userTable->limitOffset(10, 30)->select()->fetchAll());查询单行:
var_dump($userTable->where('id = "htmlcode">var_dump($userTable->find(4));update更新数据:
$user = array( 'username' => 'admin4-1', 'nickname' => '管理员4-1', ); echo $userTable->where('id = "\n";replace替换数据:
使用了MySQL的REPLACE语句
$user = array( 'id' => 4, 'username' => 'admin4', 'password' => 'admin4', 'nickname' => '管理员4', 'r' => mt_rand(0, 5), ); echo $userTable->replace($user)->rowCount(), "\n";删除数据:
echo $userTable->where('id = "\n";分页查询
第2页, 每页10行数据:
var_dump($userTable->page(2, 10)->select()->fetchAll());分页查询的总行数:
$userTable->where('r="\n";复杂查询:
var_dump($userTable->where('id > "htmlcode">$id = 2; // 加一 var_dump($userTable->where('id = "htmlcode">$id = 2; // 加一 echo $userTable->where('id = "\n"; // 减一 echo $userTable->where('id = "\n";save 保存修改:
判断数据中是否存在主键字段,如果存在主键字段就update数据,反之insert数据
// 修改 $user = array( 'id' => 3, 'nickname' => '管理员3-3', ); echo $userTable->save($user)->rowCount(), "\n"; var_dump($userTable->find(3)); // 添加 $user = array( 'username' => 'admin11', 'password' => 'admin11', 'nickname' => '管理员11', 'r' => mt_rand(0, 5), ); echo $userTable->save($user)->rowCount(), "\n"; $id = $userTable->lastInsertId(); var_dump($userTable->find($id));生成外表测试数据:
$users = $userTable->select('id')->fetchAll(); $id = 0; foreach ($users as $user) { for ($i=0; $i<10; $i++) { $id++; $blog = array( 'user_id' => $user['id'], 'title' => "blog$id", ); $blogTable->insert($blog); } }Table类不支持JOIN查询
需要的朋友可以手写sql语句,使用query方法来执行.或者自己修改Table类来支持JOIN
获取外表数据:
$blogs = $blogTable->where('id in ("htmlcode">// 获取映射数据 var_dump($userTable->select('*, id')->fetchAll(PDO::FETCH_UNIQUE)); // 获取数组 var_dump($userTable->select('nickname')->fetchAll(PDO::FETCH_COLUMN)); // 获取键值对 var_dump($userTable->select('id, nickname')->fetchAll(PDO::FETCH_KEY_PAIR)); // 获取数据分组 var_dump($userTable->select('r, id, nickname')->fetchAll(PDO::FETCH_GROUP)); // 获取数据分组 var_dump($userTable->select('r, id')->fetchAll(PDO::FETCH_GROUP|PDO::FETCH_COLUMN)); // 获取数据分组 var_dump($userTable->select('r, nickname')->fetchAll(PDO::FETCH_GROUP|PDO::FETCH_KEY_PAIR)); // 获取对象 指定获取方式,将结果集中的每一行作为一个属性名对应列名的对象返回。 var_dump($userTable->select()->fetchAll(PDO::FETCH_OBJ)); // 获取对象 指定获取方式,返回一个所请求类的新实例,映射列到类中对应的属性名。 // Note: 如果所请求的类中不存在该属性,则调用 __set() 魔术方法 var_dump($userTable->select()->fetchAll(PDO::FETCH_CLASS)); // 获取对象 指定获取方式,更新一个请求类的现有实例,映射列到类中对应的属性名。 var_dump($userTable->select()->fetchAll(PDO::FETCH_INTO)); // 获取自定义行 var_dump($userTable->select()->fetchAll(PDO::FETCH_FUNC, function($id, $username, $password, $r){ return array('id'=>$id, 'name'=>"$username - $password - $r"); })); // 获取单一值 var_dump($userTable->select()->fetchAll(PDO::FETCH_FUNC, function($id, $username, $password, $r){ return "$id - $username - $password - $r"; }));Table类源代码:
<"mysql:host=%s;dbname=%s;charset=%s;", self::$__host, self::$__name, self::$__charset); $options = array( PDO::ATTR_PERSISTENT => true, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC ); return self::$__pdo = new PDO($dsn, self::$__user, self::$__pass, $options); } /** * 执行语句 * @param string $sql * @return PDOStatement */ public function query($sql) { $params = func_get_args(); array_shift($params); return $this->queryParams($sql, $params); } /** * 执行语句 * @param string $sql * @return PDOStatement */ public function queryParams($sql, array $params) { $sqls = explode('"\n"; var_dump($params_new); // exit(); $stmt->executeResult = $stmt->execute(); $this->reset(); return $stmt; } /** * 查询数据 * @param string $field * @return PDOStatement */ public function select($columns='*') { $params = array_merge($this->_where_params, $this->_having_params); $sql = "SELECT $columns FROM `{$this->_table}`"; $sql .= empty($this->_where) "INSERT `{$this->_table}` SET"; $params = array(); foreach ($data as $col=>$val) { $sql .= " `$col` = "; $params[] = $val; } $sql{strlen($sql)-1} = ' '; return $this->queryParams($sql, $params); } /** * 批量插入数据 * @param array $names * @param array $rows * @param number $batch * @return Table */ public function batchInsert(array $fields, array $rows, $batch=1000) { $i = 0; $sql = "INSERT `{$this->_table}` (`".implode('`, `', $fields)."`) VALUES "; foreach ($rows as $row) { $i++; $sql .= "('".implode("','", array_map('addslashes', $row))."'),"; if ($i >= $batch) { $sql{strlen($sql)-1} = ' '; $this->query($sql); $i = 0; $sql = "INSERT `{$this->_table}` (`".implode('`, `', $fields)."`) VALUES "; } } if ($i > 0) { $sql{strlen($sql)-1} = ' '; $this->query($sql); } return $this; } /** * 更新数据 * @param array $data * @return PDOStatement */ public function update(array $data) { $sql = "UPDATE `{$this->_table}` SET"; $params = array(); foreach ($data as $col=>$val) { $sql .= " `$col` = "; $params[] = $val; } $sql{strlen($sql)-1} = ' '; $sql .= empty($this->_where) "REPLACE `{$this->_table}` SET"; $params = array(); foreach ($data as $col=>$val) { $sql .= " `$col` = "; $params[] = $val; } $sql{strlen($sql)-1} = ' '; $sql .= empty($this->_where) "DELETE FROM `{$this->_table}`"; $sql .= empty($this->_where) "SELECT count(*) FROM `{$this->_table}`"; $sql .= empty($this->_count_where) "`$col` = `$col` + $val"); $args = array_slice(func_get_args(), 2); while (count($args) > 1) { $col = array_shift($args); $val = array_shift($args); $sets[] = "`$col` = `$col` + $val"; } $sql = "UPDATE `{$this->_table}` SET ".implode(', ', $sets); $sql .= empty($this->_where) "UPDATE `{$this->_table}` SET `$col` = last_insert_id(`$col` + "; $sql .= empty($this->_where) "`{$this->_pk}` = ", $id)->select()->fetch(); } /** * 保存数据,自动判断是新增还是更新 * @param array $data * @return PDOStatement */ public function save(array $data) { if (array_key_exists($this->_pk, $data)) { $pk_val = $data[$this->_pk]; unset($data[$this->_pk]); return $this->where("`{$this->_pk}` = ", $pk_val)->update($data); } else { return $this->insert($data); } } /** * 获取外键数据 * @param array $rows * @param string $fkey * @param string $field * @param string $key * @return PDOStatement */ public function foreignKey(array $rows, $fkey, $field='*') { $ids = array(); foreach($rows as $row) { $ids[] = $row[$fkey]; } // $ids = array_column($rows, $fkey); if (empty($ids)) { return new PDOStatement(); } return $this->where("`{$this->_pk}` in (", $ids)->select($field); } }github地址:
https://github.com/dotcoo/php/blob/master/Table/Table.php
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