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MysqliDb -- 使用预处理语句的简单 MySQLi 包装器和对象映射器

初始化
对象映射
插入查询
更新查询
选择查询
删除查询
插入数据
插入 XML
分页
运行原始 SQL 查询
查询关键字
WHERE 条件
ORDER 条件
GROUP 条件
属性共享
联合表
子查询
EXISTS / NOT EXISTS 条件
has 方法
辅助方法
事务辅助方法
错误辅助方法
表锁定

支持我

这款软件是在我的空闲时间开发的，如果有人支持我，我会很高兴。

每个人的时间都应该是宝贵的，所以请考虑捐款。

使用 paypal 捐款

安装

要使用此类，首先将 MysqliDb.php 导入到您的项目中，并引入它。

require_once ('MysqliDb.php');

使用 composer 安装

也可以通过 composer 安装库

composer require easy-swoole-php/mysqli-database-class:dev-master

初始化

简单的初始化，默认设置为 utf8 编码

$db = new MysqliDb ('host', 'username', 'password', 'databaseName');

高级初始化

$db = new MysqliDb (Array (
                'host' => 'host',
                'username' => 'username', 
                'password' => 'password',
                'db'=> 'databaseName',
                'port' => 3306,
                'prefix' => 'my_',
                'charset' => 'utf8'));

表前缀、端口号和数据库编码参数是可选的。如果不设置编码，将其设置为 null

还可以重用已经连接的 mysqli 对象

$mysqli = new mysqli ('host', 'username', 'password', 'databaseName');
$db = new MysqliDb ($mysqli);

如果在对象创建期间没有设置表前缀，则可以在单独的调用中设置它

$db->setPrefix ('my_');

如果连接到 mysql 将被断开，Mysqlidb 将尝试自动重新连接到数据库一次。要禁用此行为，请使用

$db->autoReconnect = false;

如果您需要从另一个类或函数中获取已经创建的 mysqliDb 对象，请使用

    function init () {
        // db staying private here
        $db = new MysqliDb ('host', 'username', 'password', 'databaseName');
    }
    ...
    function myfunc () {
        // obtain db object created in init  ()
        $db = MysqliDb::getInstance();
        ...
    }

多个数据库连接

如果您需要连接到多个数据库，请使用以下方法

$db->addConnection('slave', Array (
                'host' => 'host',
                'username' => 'username',
                'password' => 'password',
                'db'=> 'databaseName',
                'port' => 3306,
                'prefix' => 'my_',
                'charset' => 'utf8')
);

要选择数据库，请使用 connection() 方法

$users = $db->connection('slave')->get('users');

对象映射

dbObject.php 是一个基于 mysqliDb 的对象映射库，用于提供模型表示功能。有关更多信息，请参阅 dbObject 手册

插入查询

简单示例

$data = Array ("login" => "admin",
               "firstName" => "John",
               "lastName" => 'Doe'
);
$id = $db->insert ('users', $data);
if($id)
    echo 'user was created. Id=' . $id;

使用函数插入

$data = Array (
	'login' => 'admin',
    'active' => true,
	'firstName' => 'John',
	'lastName' => 'Doe',
	'password' => $db->func('SHA1(?)',Array ("secretpassword+salt")),
	// password = SHA1('secretpassword+salt')
	'createdAt' => $db->now(),
	// createdAt = NOW()
	'expires' => $db->now('+1Y')
	// expires = NOW() + interval 1 year
	// Supported intervals [s]econd, [m]inute, [h]hour, [d]day, [M]onth, [Y]ear
);

$id = $db->insert ('users', $data);
if ($id)
    echo 'user was created. Id=' . $id;
else
    echo 'insert failed: ' . $db->getLastError();

使用 on duplicate key update 插入

$data = Array ("login" => "admin",
               "firstName" => "John",
               "lastName" => 'Doe',
               "createdAt" => $db->now(),
               "updatedAt" => $db->now(),
);
$updateColumns = Array ("updatedAt");
$lastInsertId = "id";
$db->onDuplicate($updateColumns, $lastInsertId);
$id = $db->insert ('users', $data);

一次性插入多个数据集

$data = Array(
    Array ("login" => "admin",
        "firstName" => "John",
        "lastName" => 'Doe'
    ),
    Array ("login" => "other",
        "firstName" => "Another",
        "lastName" => 'User',
        "password" => "very_cool_hash"
    )
);
$ids = $db->insertMulti('users', $data);
if(!$ids) {
    echo 'insert failed: ' . $db->getLastError();
} else {
    echo 'new users inserted with following id\'s: ' . implode(', ', $ids);
}

如果所有数据集都只有相同的键，则可以简化

$data = Array(
    Array ("admin", "John", "Doe"),
    Array ("other", "Another", "User")
);
$keys = Array("login", "firstName", "lastName");

$ids = $db->insertMulti('users', $data, $keys);
if(!$ids) {
    echo 'insert failed: ' . $db->getLastError();
} else {
    echo 'new users inserted with following id\'s: ' . implode(', ', $ids);
}

替换查询

Replace() 方法实现了与 insert() 相同的 API

更新查询

$data = Array (
	'firstName' => 'Bobby',
	'lastName' => 'Tables',
	'editCount' => $db->inc(2),
	// editCount = editCount + 2;
	'active' => $db->not()
	// active = !active;
);
$db->where ('id', 1);
if ($db->update ('users', $data))
    echo $db->count . ' records were updated';
else
    echo 'update failed: ' . $db->getLastError();

update() 也支持 limit 参数

$db->update ('users', $data, 10);
// Gives: UPDATE users SET ... LIMIT 10

选择查询

在 select/get 函数调用之后，数量或返回的行数存储在 $count 变量中

$users = $db->get('users'); //contains an Array of all users 
$users = $db->get('users', 10); //contains an Array 10 users

或选择具有自定义列集的查询。函数也可以使用

$cols = Array ("id", "name", "email");
$users = $db->get ("users", null, $cols);
if ($db->count > 0)
    foreach ($users as $user) { 
        print_r ($user);
    }

或选择一行

$db->where ("id", 1);
$user = $db->getOne ("users");
echo $user['id'];

$stats = $db->getOne ("users", "sum(id), count(*) as cnt");
echo "total ".$stats['cnt']. "users found";

或选择一个列值或函数结果

$count = $db->getValue ("users", "count(*)");
echo "{$count} users found";

从多行中选择一个列值或函数结果

$logins = $db->getValue ("users", "login", null);
// select login from users
$logins = $db->getValue ("users", "login", 5);
// select login from users limit 5
foreach ($logins as $login)
    echo $login;

插入数据

您还可以将 .CSV 或 .XML 数据加载到特定表中。要插入 .csv 数据，请使用以下语法

$path_to_file = "/home/john/file.csv";
$db->loadData("users", $path_to_file);

这将加载一个名为 file.csv 的 .csv 文件，位于 /home/john/（john 的家目录）。您还可以附加一个可选的选项数组。有效的选项有

Array(
	"fieldChar" => ';', 	// Char which separates the data
	"lineChar" => '\r\n', 	// Char which separates the lines
	"linesToIgnore" => 1	// Amount of lines to ignore at the beginning of the import
);

使用以下方式附加它们

$options = Array("fieldChar" => ';', "lineChar" => '\r\n', "linesToIgnore" => 1);
$db->loadData("users", "/home/john/file.csv", $options);
// LOAD DATA ...

您可以选择使用 LOCAL DATA 而不是 DATA

$options = Array("fieldChar" => ';', "lineChar" => '\r\n', "linesToIgnore" => 1, "loadDataLocal" => true);
$db->loadData("users", "/home/john/file.csv", $options);
// LOAD DATA LOCAL ...

插入 XML

要将XML数据加载到表格中，您可以使用loadXML方法。其语法与loadData语法相似。

$path_to_file = "/home/john/file.xml";
$db->loadXML("users", $path_to_file);

您还可以添加可选参数。有效的参数

Array(
	"linesToIgnore" => 0,		// Amount of lines / rows to ignore at the beginning of the import
	"rowTag"	=> "<user>"	// The tag which marks the beginning of an entry
)

用法

$options = Array("linesToIgnore" => 0, "rowTag"	=> "<user>"):
$path_to_file = "/home/john/file.xml";
$db->loadXML("users", $path_to_file, $options);

分页

使用paginate()代替get()来获取分页结果

$page = 1;
// set page limit to 2 results per page. 20 by default
$db->pageLimit = 2;
$products = $db->arraybuilder()->paginate("products", $page);
echo "showing $page out of " . $db->totalPages;

结果转换/映射

获取纯数组结果而不是结果数组，可以获取具有所需键的关联数组。如果只获取2个字段，则get()方法将返回数组($k => $v)和数组($k => array($v, $v))在其余情况下。

$user = $db->map ('login')->ObjectBuilder()->getOne ('users', 'login, id');
Array
(
    [user1] => 1
)

$user = $db->map ('login')->ObjectBuilder()->getOne ('users', 'id,login,createdAt');
Array
(
    [user1] => stdClass Object
        (
            [id] => 1
            [login] => user1
            [createdAt] => 2015-10-22 22:27:53
        )

)

定义返回类型

MysqliDb可以以3种不同的格式返回结果：数组、对象数组和JSON字符串。要选择返回类型，请使用ArrayBuilder()、ObjectBuilder()和JsonBuilder()方法。请注意，ArrayBuilder()是默认返回类型

// Array return type
$u= $db->getOne("users");
echo $u['login'];
// Object return type
$u = $db->ObjectBuilder()->getOne("users");
echo $u->login;
// Json return type
$json = $db->JsonBuilder()->getOne("users");

运行原始 SQL 查询

$users = $db->rawQuery('SELECT * from users where id >= ?', Array (10));
foreach ($users as $user) {
    print_r ($user);
}

为了避免冗长的if检查，有一些辅助函数可以处理原始查询选择结果

获取1行结果

$user = $db->rawQueryOne('SELECT * from users where id=?', Array(10));
echo $user['login'];
// Object return type
$user = $db->ObjectBuilder()->rawQueryOne('SELECT * from users where id=?', Array(10));
echo $user->login;

获取1列值作为字符串

$password = $db->rawQueryValue('SELECT password from users where id=? limit 1', Array(10));
echo "Password is {$password}";
NOTE: for a rawQueryValue() to return string instead of an array 'limit 1' should be added to the end of the query.

获取多行中的1列值

$logins = $db->rawQueryValue('SELECT login from users limit 10');
foreach ($logins as $login)
    echo $login;

更高级的示例

$params = Array(1, 'admin');
$users = $db->rawQuery("SELECT id, firstName, lastName FROM users WHERE id = ? AND login = ?", $params);
print_r($users); // contains Array of returned rows

// will handle any SQL query
$params = Array(10, 1, 10, 11, 2, 10);
$q = "(
    SELECT a FROM t1
        WHERE a = ? AND B = ?
        ORDER BY a LIMIT ?
) UNION (
    SELECT a FROM t2 
        WHERE a = ? AND B = ?
        ORDER BY a LIMIT ?
)";
$results = $db->rawQuery ($q, $params);
print_r ($results); // contains Array of returned rows

Where / Having方法

where()、orWhere()、having()和orHaving()方法允许您指定查询的where和having条件。where()支持的所有条件也由having()支持。

警告：为了使用列到列的比较，只能使用原始where条件作为列名或函数不能作为绑定变量传递。

常规==操作符与变量

$db->where ('id', 1);
$db->where ('login', 'admin');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id=1 AND login='admin';

$db->where ('id', 1);
$db->having ('login', 'admin');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id=1 HAVING login='admin';

常规==操作符与列到列的比较

// WRONG
$db->where ('lastLogin', 'createdAt');
// CORRECT
$db->where ('lastLogin = createdAt');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE lastLogin = createdAt;

$db->where ('id', 50, ">=");
// or $db->where ('id', Array ('>=' => 50));
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id >= 50;

BETWEEN / NOT BETWEEN

$db->where('id', Array (4, 20), 'BETWEEN');
// or $db->where ('id', Array ('BETWEEN' => Array(4, 20)));

$results = $db->get('users');
// Gives: SELECT * FROM users WHERE id BETWEEN 4 AND 20

IN / NOT IN

$db->where('id', Array(1, 5, 27, -1, 'd'), 'IN');
// or $db->where('id', Array( 'IN' => Array(1, 5, 27, -1, 'd') ) );

$results = $db->get('users');
// Gives: SELECT * FROM users WHERE id IN (1, 5, 27, -1, 'd');

OR CASE

$db->where ('firstName', 'John');
$db->orWhere ('firstName', 'Peter');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE firstName='John' OR firstName='peter'

NULL比较

$db->where ("lastName", NULL, 'IS NOT');
$results = $db->get("users");
// Gives: SELECT * FROM users where lastName IS NOT NULL

LIKE比较

$db->where ("fullName", 'John%', 'like');
$results = $db->get("users");
// Gives: SELECT * FROM users where fullName like 'John%'

您还可以使用原始where条件

$db->where ("id != companyId");
$db->where ("DATE(createdAt) = DATE(lastLogin)");
$results = $db->get("users");

或使用变量的原始条件

$db->where ("(id = ? or id = ?)", Array(6,2));
$db->where ("login","mike");
$res = $db->get ("users");
// Gives: SELECT * FROM users WHERE (id = 6 or id = 2) and login='mike';

找到匹配的行总数。简单的分页示例

$offset = 10;
$count = 15;
$users = $db->withTotalCount()->get('users', Array ($offset, $count));
echo "Showing {$count} from {$db->totalCount}";

查询关键字

要将LOW PRIORITY | DELAYED | HIGH PRIORITY | IGNORE等MySQL关键字添加到INSERT ()、REPLACE ()、GET ()、UPDATE ()、DELETE ()方法中，或将FOR UPDATE | LOCK IN SHARE MODE添加到SELECT ()中

$db->setQueryOption ('LOW_PRIORITY')->insert ($table, $param);
// GIVES: INSERT LOW_PRIORITY INTO table ...

$db->setQueryOption ('FOR UPDATE')->get ('users');
// GIVES: SELECT * FROM USERS FOR UPDATE;

您还可以使用关键字数组

$db->setQueryOption (Array('LOW_PRIORITY', 'IGNORE'))->insert ($table,$param);
// GIVES: INSERT LOW_PRIORITY IGNORE INTO table ...

同样，关键字也可以用于SELECT查询

$db->setQueryOption ('SQL_NO_CACHE');
$db->get("users");
// GIVES: SELECT SQL_NO_CACHE * FROM USERS;

您还可以使用方法链来调用where多次，而无需多次引用您的对象

$results = $db
	->where('id', 1)
	->where('login', 'admin')
	->get('users');

删除查询

$db->where('id', 1);
if($db->delete('users')) echo 'successfully deleted';

排序方法

$db->orderBy("id","asc");
$db->orderBy("login","Desc");
$db->orderBy("RAND ()");
$results = $db->get('users');
// Gives: SELECT * FROM users ORDER BY id ASC,login DESC, RAND ();

排序值示例

$db->orderBy('userGroup', 'ASC', array('superuser', 'admin', 'users'));
$db->get('users');
// Gives: SELECT * FROM users ORDER BY FIELD (userGroup, 'superuser', 'admin', 'users') ASC;

如果您正在使用setPrefix ()功能，并在orderBy()方法中需要使用表名，请确保表名用```转义。

$db->setPrefix ("t_");
$db->orderBy ("users.id","asc");
$results = $db->get ('users');
// WRONG: That will give: SELECT * FROM t_users ORDER BY users.id ASC;

$db->setPrefix ("t_");
$db->orderBy ("`users`.id", "asc");
$results = $db->get ('users');
// CORRECT: That will give: SELECT * FROM t_users ORDER BY t_users.id ASC;

分组方法

$db->groupBy ("name");
$results = $db->get ('users');
// Gives: SELECT * FROM users GROUP BY name;

JOIN方法

通过tenantID使用LEFT JOIN将表products与表users连接

$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->where("u.id", 6);
$products = $db->get ("products p", null, "u.name, p.productName");
print_r ($products);
// Gives: SELECT u.name, p.productName FROM products p LEFT JOIN users u ON p.tenantID=u.tenantID WHERE u.id = 6

连接条件

向连接语句添加AND条件

$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->joinWhere("users u", "u.tenantID", 5);
$products = $db->get ("products p", null, "u.name, p.productName");
print_r ($products);
// Gives: SELECT  u.name, p.productName FROM products p LEFT JOIN users u ON (p.tenantID=u.tenantID AND u.tenantID = 5)

向连接语句添加OR条件

$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->joinOrWhere("users u", "u.tenantID", 5);
$products = $db->get ("products p", null, "u.name, p.productName");
print_r ($products);
// Gives: SELECT  u.login, p.productName FROM products p LEFT JOIN users u ON (p.tenantID=u.tenantID OR u.tenantID = 5)

属性共享

您还可以复制属性

$db->where ("agentId", 10);
$db->where ("active", true);

$customers = $db->copy ();
$res = $customers->get ("customers", Array (10, 10));
// SELECT * FROM customers WHERE agentId = 10 AND active = 1 LIMIT 10, 10

$cnt = $db->getValue ("customers", "count(id)");
echo "total records found: " . $cnt;
// SELECT count(id) FROM customers WHERE agentId = 10 AND active = 1

子查询

子查询初始化

没有别名以供插入/更新/where使用的子查询初始化。例如：(select * from users)

$sq = $db->subQuery();
$sq->get ("users");

指定别名的子查询以供JOIN使用。例如：(select * from users) sq

$sq = $db->subQuery("sq");
$sq->get ("users");

子查询在SELECT中

$ids = $db->subQuery ();
$ids->where ("qty", 2, ">");
$ids->get ("products", null, "userId");

$db->where ("id", $ids, 'in');
$res = $db->get ("users");
// Gives SELECT * FROM users WHERE id IN (SELECT userId FROM products WHERE qty > 2)

子查询在INSERT中

$userIdQ = $db->subQuery ();
$userIdQ->where ("id", 6);
$userIdQ->getOne ("users", "name"),

$data = Array (
    "productName" => "test product",
    "userId" => $userIdQ,
    "lastUpdated" => $db->now()
);
$id = $db->insert ("products", $data);
// Gives INSERT INTO PRODUCTS (productName, userId, lastUpdated) values ("test product", (SELECT name FROM users WHERE id = 6), NOW());

子查询在JOIN中

$usersQ = $db->subQuery ("u");
$usersQ->where ("active", 1);
$usersQ->get ("users");

$db->join($usersQ, "p.userId=u.id", "LEFT");
$products = $db->get ("products p", null, "u.login, p.productName");
print_r ($products);
// SELECT u.login, p.productName FROM products p LEFT JOIN (SELECT * FROM t_users WHERE active = 1) u on p.userId=u.id;

EXISTS / NOT EXISTS 条件

$sub = $db->subQuery();
$sub->where("company", 'testCompany');
$sub->get ("users", null, 'userId');
$db->where (null, $sub, 'exists');
$products = $db->get ("products");
// Gives SELECT * FROM products WHERE EXISTS (SELECT userId FROM users WHERE company='testCompany')

has 方法

一个方便的函数，如果存在至少一个满足在调用此方法之前的where条件的元素，则返回TRUE。

$db->where("user", $user);
$db->where("password", md5($password));
if($db->has("users")) {
    return "You are logged";
} else {
    return "Wrong user/password";
}

辅助方法

从数据库断开连接

    $db->disconnect();

如果MySQL连接失败，请重新连接

if (!$db->ping())
    $db->connect()

获取最后执行的SQL查询：请注意，此方法仅用于调试目的返回SQL查询，因为其执行很可能会因缺少char变量的引号而失败。

    $db->get('users');
    echo "Last executed query was ". $db->getLastQuery();

检查表是否存在

    if ($db->tableExists ('users'))
        echo "hooray";

mysqli_real_escape_string()包装器

    $escaped = $db->escape ("' and 1=1");

事务辅助

请记住，事务在InnoDB表中工作。如果插入失败，则回滚事务

$db->startTransaction();
...
if (!$db->insert ('myTable', $insertData)) {
    //Error while saving, cancel new record
    $db->rollback();
} else {
    //OK
    $db->commit();
}

错误辅助

在执行查询后，您可以选择检查是否出错。您可以得到最后执行的查询的MySQL错误字符串或错误代码。

$db->where('login', 'admin')->update('users', ['firstName' => 'Jack']);

if ($db->getLastErrno() === 0)
    echo 'Update succesfull';
else
    echo 'Update failed. Error: '. $db->getLastError();

查询执行时间基准测试

要跟踪查询执行时间，应调用setTrace()函数。

$db->setTrace (true);
// As a second parameter it is possible to define prefix of the path which should be striped from filename
// $db->setTrace (true, $_SERVER['SERVER_ROOT']);
$db->get("users");
$db->get("test");
print_r ($db->trace);

    [0] => Array
        (
            [0] => SELECT  * FROM t_users ORDER BY `id` ASC
            [1] => 0.0010669231414795
            [2] => MysqliDb->get() >>  file "/avb/work/PHP-MySQLi-Database-Class/tests.php" line #151
        )

    [1] => Array
        (
            [0] => SELECT  * FROM t_test
            [1] => 0.00069189071655273
            [2] => MysqliDb->get() >>  file "/avb/work/PHP-MySQLi-Database-Class/tests.php" line #152
        )

表锁定

要锁定表，可以使用lock方法和setLockMethod。以下示例将锁定名为users的表以进行写访问。

$db->setLockMethod("WRITE")->lock("users");

再次调用->lock()将移除第一个锁定。您还可以使用

$db->unlock();

来解锁之前锁定的表。要锁定多个表，可以使用数组。例如

$db->setLockMethod("READ")->lock(array("users", "log"));

这将仅对users和log表进行读访问锁定。请确保随后使用unlock()解锁，否则您的表将保持锁定状态！

easy-swoole-php / mysqli-database-class

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