如何连接 phalcon php phql 中的字符串？

Question

我有以下 Phql 查询：

$persons = Person::query()
        ->columns([
            'id' => 'id',
            'name' => 'first_name || last_name'
        ])
        ->where("first_name LIKE :searchQuery:")
        ->orWhere("last_name LIKE :searchQuery:")
        ->bind(['searchQuery' => $searchQuery . '%'])
        ->execute();

使用的数据库是sqlite数据库。

查询工作正常，直到我包含 sqlite ||

的串联运算符

抛出的异常是：

Scanner: Unknown opcode 402

我试过CONCAT(first_name, last_name)，但它抛出异常：

SQLSTATE[HY000]: General error: 1 no such function: CONCAT

Answer 1

遗憾的是，sqllite 不支持此功能，但您可以扩展 class 并添加对 MySQL concat 函数的支持。这是一个可行的解决方案：https://forum.phalconphp.com/discussion/15233/concatenate-columns-using-sqlite

MySQL 解决办法：

->columns([
    'id',
    'CONCAT_WS("@", id, created_at) AS concatenatedValue',
])

结果

Array
(
    [0] => Array
        (
            [id] => 1
            [concatenatedValue] => 1@2017-04-04 12:08:52

Answer 2

使用方言扩展也更好：

namespace App/Dialect;

class Sqlite extends \Phalcon\Db\Dialect\Sqlite
{
    /**
     * Sqlite constructor.
     */
    public function __construct()
    {
        $this->registerCustomFunctions();
    }

    /**
     * Register Custom dialect functions
     */
    public function registerCustomFunctions()
    {
        $customFunctions = [
            'CONCAT_WS'  => 'ConcatWs',
        ];
        foreach ($customFunctions as $key => $value) {
            $className = 'App\Dialect\Extensions\'.$value;
            $object = new $className;
            $this->registerCustomFunction($key, $object->getFunction());
        }
    }
}

namespace App/Dialect/Extensions;

class ConcatWs
{
    public function getFunction()
    {
        return function (Dialect $dialect, $expression) {
            $sql = '';


            $count = count($expression['arguments']);

            if (true !== $count >= 2) {
                throw new Exception('CONCAT_WS requires 2 or more parameters');
            }

            if (2 === $count) {
                return $this->getSqlExpression($expression['arguments'][1]);
            }

            $separator = array_shift($expression['arguments']);

            --$count;
            foreach ($expression['arguments'] as $argument) {
                $sql .= $this->getSqlExpression($argument);
                if (0 !== --$count) {
                    $sql .= ' || '.$this->getSqlExpression($separator).' || ';
                }
            }

            return $sql;
        };
    }
}

然后在您的数据库服务中：

use App/Dialect/Sqlite as SqliteDialect;

$di->set('db', function() {
    return new Sqlite([
        // other options, like password etc
        'dialectClass' => SqliteDialect::class
    ]);
});

如何连接 phalcon php phql 中的字符串？

How to concatenate strings in phalcon php phql?

php

phalcon