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Filename : ConnectionInterface.php
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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\Database;

/**
 * @template TConnection
 * @template TResult
 */
interface ConnectionInterface
{
    /**
     * Initializes the database connection/settings.
     *
     * @return void
     */
    public function initialize();

    /**
     * Connect to the database.
     *
     * @return false|object|resource
     * @phpstan-return false|TConnection
     */
    public function connect(bool $persistent = false);

    /**
     * Create a persistent database connection.
     *
     * @return false|object|resource
     * @phpstan-return false|TConnection
     */
    public function persistentConnect();

    /**
     * Keep or establish the connection if no queries have been sent for
     * a length of time exceeding the server's idle timeout.
     *
     * @return void
     */
    public function reconnect();

    /**
     * Returns the actual connection object. If both a 'read' and 'write'
     * connection has been specified, you can pass either term in to
     * get that connection. If you pass either alias in and only a single
     * connection is present, it must return the sole connection.
     *
     * @return false|object|resource
     * @phpstan-return false|TConnection
     */
    public function getConnection(?string $alias = null);

    /**
     * Select a specific database table to use.
     *
     * @return bool
     */
    public function setDatabase(string $databaseName);

    /**
     * Returns the name of the current database being used.
     */
    public function getDatabase(): string;

    /**
     * Returns the last error encountered by this connection.
     * Must return this format: ['code' => string|int, 'message' => string]
     * intval(code) === 0 means "no error".
     *
     * @return array<string, int|string>
     */
    public function error(): array;

    /**
     * The name of the platform in use (MySQLi, mssql, etc)
     */
    public function getPlatform(): string;

    /**
     * Returns a string containing the version of the database being used.
     */
    public function getVersion(): string;

    /**
     * Orchestrates a query against the database. Queries must use
     * Database\Statement objects to store the query and build it.
     * This method works with the cache.
     *
     * Should automatically handle different connections for read/write
     * queries if needed.
     *
     * @param array|string|null $binds
     *
     * @return BaseResult|bool|Query
     * @phpstan-return BaseResult<TConnection, TResult>|bool|Query
     */
    public function query(string $sql, $binds = null);

    /**
     * Performs a basic query against the database. No binding or caching
     * is performed, nor are transactions handled. Simply takes a raw
     * query string and returns the database-specific result id.
     *
     * @return false|object|resource
     * @phpstan-return false|TResult
     */
    public function simpleQuery(string $sql);

    /**
     * Returns an instance of the query builder for this connection.
     *
     * @param array|string $tableName Table name.
     *
     * @return BaseBuilder Builder.
     */
    public function table($tableName);

    /**
     * Returns the last query's statement object.
     *
     * @return Query
     */
    public function getLastQuery();

    /**
     * "Smart" Escaping
     *
     * Escapes data based on type.
     * Sets boolean and null types.
     *
     * @param array|bool|float|int|object|string|null $str
     *
     * @return array|float|int|string
     * @phpstan-return ($str is array ? array : float|int|string)
     */
    public function escape($str);

    /**
     * Allows for custom calls to the database engine that are not
     * supported through our database layer.
     *
     * @param array ...$params
     *
     * @return array|bool|float|int|object|resource|string|null
     */
    public function callFunction(string $functionName, ...$params);

    /**
     * Determines if the statement is a write-type query or not.
     *
     * @param string $sql
     */
    public function isWriteType($sql): bool;
}