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<?php

namespace Illuminate\Database\Schema;

class MySqlBuilder extends Builder
{
    /**
     * Create a database in the schema.
     *
     * @param  string  $name
     * @return bool
     */
    public function createDatabase($name)
    {
        return $this->connection->statement(
            $this->grammar->compileCreateDatabase($name, $this->connection)
        );
    }

    /**
     * Drop a database from the schema if the database exists.
     *
     * @param  string  $name
     * @return bool
     */
    public function dropDatabaseIfExists($name)
    {
        return $this->connection->statement(
            $this->grammar->compileDropDatabaseIfExists($name)
        );
    }

    /**
     * Determine if the given table exists.
     *
     * @param  string  $table
     * @return bool
     */
    public function hasTable($table)
    {
        $table = $this->connection->getTablePrefix().$table;

        return count($this->connection->selectFromWriteConnection(
            $this->grammar->compileTableExists(), [$this->connection->getDatabaseName(), $table]
        )) > 0;
    }

    /**
     * Get the column listing for a given table.
     *
     * @param  string  $table
     * @return array
     */
    public function getColumnListing($table)
    {
        $table = $this->connection->getTablePrefix().$table;

        $results = $this->connection->selectFromWriteConnection(
            $this->grammar->compileColumnListing(), [$this->connection->getDatabaseName(), $table]
        );

        return $this->connection->getPostProcessor()->processColumnListing($results);
    }

    /**
     * Drop all tables from the database.
     *
     * @return void
     */
    public function dropAllTables()
    {
        $tables = [];

        foreach ($this->getAllTables() as $row) {
            $row = (array) $row;

            $tables[] = reset($row);
        }

        if (empty($tables)) {
            return;
        }

        $this->disableForeignKeyConstraints();

        $this->connection->statement(
            $this->grammar->compileDropAllTables($tables)
        );

        $this->enableForeignKeyConstraints();
    }

    /**
     * Drop all views from the database.
     *
     * @return void
     */
    public function dropAllViews()
    {
        $views = [];

        foreach ($this->getAllViews() as $row) {
            $row = (array) $row;

            $views[] = reset($row);
        }

        if (empty($views)) {
            return;
        }

        $this->connection->statement(
            $this->grammar->compileDropAllViews($views)
        );
    }

    /**
     * Get all of the table names for the database.
     *
     * @return array
     */
    public function getAllTables()
    {
        return $this->connection->select(
            $this->grammar->compileGetAllTables()
        );
    }

    /**
     * Get all of the view names for the database.
     *
     * @return array
     */
    public function getAllViews()
    {
        return $this->connection->select(
            $this->grammar->compileGetAllViews()
        );
    }
}