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Directory : /var/www/iNewsl/vendor/laravel/framework/src/Illuminate/Database/Query/Grammars/

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Current File : /var/www/iNewsl/vendor/laravel/framework/src/Illuminate/Database/Query/Grammars/MySqlGrammar.php

<?php

namespace Illuminate\Database\Query\Grammars;

use Illuminate\Support\Str;
use Illuminate\Database\Query\Builder;
use Illuminate\Database\Query\JsonExpression;

class MySqlGrammar extends Grammar
{
    /**
     * The components that make up a select clause.
     *
     * @var array
     */
    protected $selectComponents = [
        'aggregate',
        'columns',
        'from',
        'joins',
        'wheres',
        'groups',
        'havings',
        'orders',
        'limit',
        'offset',
        'lock',
    ];

    /**
     * Compile a select query into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @return string
     */
    public function compileSelect(Builder $query)
    {
        $sql = parent::compileSelect($query);

        if ($query->unions) {
            $sql = '('.$sql.') '.$this->compileUnions($query);
        }

        return $sql;
    }

    /**
     * Compile a single union statement.
     *
     * @param  array  $union
     * @return string
     */
    protected function compileUnion(array $union)
    {
        $joiner = $union['all'] ? ' union all ' : ' union ';

        return $joiner.'('.$union['query']->toSql().')';
    }

    /**
     * Compile the random statement into SQL.
     *
     * @param  string  $seed
     * @return string
     */
    public function compileRandom($seed)
    {
        return 'RAND('.$seed.')';
    }

    /**
     * Compile the lock into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  bool|string  $value
     * @return string
     */
    protected function compileLock(Builder $query, $value)
    {
        if (is_string($value)) {
            return $value;
        }

        return $value ? 'for update' : 'lock in share mode';
    }

    /**
     * Compile an update statement into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  array  $values
     * @return string
     */
    public function compileUpdate(Builder $query, $values)
    {
        $table = $this->wrapTable($query->from);

        $columns = [];

        // Each one of the columns in the update statements needs to be wrapped in the
        // keyword identifiers, also a place-holder needs to be created for each of
        // the values in the list of bindings so we can make the sets statements.
        foreach ($values as $key => $value) {
            if ($this->isJsonSelector($key)) {
                $columns[] = $this->compileJsonUpdateColumn(
                    $key, new JsonExpression($value)
                );
            } else {
                $columns[] = $this->wrap($key).' = '.$this->parameter($value);
            }
        }

        $columns = implode(', ', $columns);

        // If the query has any "join" clauses, we will setup the joins on the builder
        // and compile them so we can attach them to this update, as update queries
        // can get join statements to attach to other tables when they're needed.
        if (isset($query->joins)) {
            $joins = ' '.$this->compileJoins($query, $query->joins);
        } else {
            $joins = '';
        }

        // Of course, update queries may also be constrained by where clauses so we'll
        // need to compile the where clauses and attach it to the query so only the
        // intended records are updated by the SQL statements we generate to run.
        $where = $this->compileWheres($query);

        $sql = rtrim("update {$table}{$joins} set $columns $where");

        if (isset($query->orders)) {
            $sql .= ' '.$this->compileOrders($query, $query->orders);
        }

        if (isset($query->limit)) {
            $sql .= ' '.$this->compileLimit($query, $query->limit);
        }

        return rtrim($sql);
    }

    /**
     * Prepares a JSON column being updated using the JSON_SET function.
     *
     * @param  string  $key
     * @param  \Illuminate\Database\Query\JsonExpression  $value
     * @return string
     */
    protected function compileJsonUpdateColumn($key, JsonExpression $value)
    {
        $path = explode('->', $key);

        $field = $this->wrapValue(array_shift($path));

        $accessor = '"$.'.implode('.', $path).'"';

        return "{$field} = json_set({$field}, {$accessor}, {$value->getValue()})";
    }

    /**
     * Prepare the bindings for an update statement.
     *
     * @param  array  $bindings
     * @param  array  $values
     * @return array
     */
    public function prepareBindingsForUpdate(array $bindings, array $values)
    {
        $index = 0;

        foreach ($values as $column => $value) {
            if ($this->isJsonSelector($column) && is_bool($value)) {
                unset($bindings[$index]);
            }

            $index++;
        }

        return $bindings;
    }

    /**
     * Compile a delete statement into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @return string
     */
    public function compileDelete(Builder $query)
    {
        $table = $this->wrapTable($query->from);

        $where = is_array($query->wheres) ? $this->compileWheres($query) : '';

        if (isset($query->joins)) {
            $joins = ' '.$this->compileJoins($query, $query->joins);

            $sql = trim("delete $table from {$table}{$joins} $where");
        } else {
            $sql = trim("delete from $table $where");

            if (isset($query->orders)) {
                $sql .= ' '.$this->compileOrders($query, $query->orders);
            }

            if (isset($query->limit)) {
                $sql .= ' '.$this->compileLimit($query, $query->limit);
            }
        }

        return $sql;
    }

    /**
     * Wrap a single string in keyword identifiers.
     *
     * @param  string  $value
     * @return string
     */
    protected function wrapValue($value)
    {
        if ($value === '*') {
            return $value;
        }

        if ($this->isJsonSelector($value)) {
            return $this->wrapJsonSelector($value);
        }

        return '`'.str_replace('`', '``', $value).'`';
    }

    /**
     * Wrap the given JSON selector.
     *
     * @param  string  $value
     * @return string
     */
    protected function wrapJsonSelector($value)
    {
        $path = explode('->', $value);

        $field = $this->wrapValue(array_shift($path));

        return $field.'->'.'"$.'.implode('.', $path).'"';
    }

    /**
     * Determine if the given string is a JSON selector.
     *
     * @param  string  $value
     * @return bool
     */
    protected function isJsonSelector($value)
    {
        return Str::contains($value, '->');
    }
}

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