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<?php |
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namespace voku\db; |
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/** |
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* Helper: this handles extra functions that use the "DB"-Class |
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* |
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* @package voku\db |
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*/ |
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class Helper |
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{ |
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/** |
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* Check if "mysqlnd"-driver is used. |
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* |
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* @return bool |
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*/ |
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public static function isMysqlndIsUsed() |
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{ |
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static $_mysqlnd_is_used = null; |
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if ($_mysqlnd_is_used === null) { |
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$_mysqlnd_is_used = (extension_loaded('mysqlnd') && function_exists('mysqli_fetch_all')); |
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} |
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return $_mysqlnd_is_used; |
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} |
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/** |
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* Check if the current environment supports "utf8mb4". |
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* |
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* @param DB $db |
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* |
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* @return bool |
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*/ |
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public static function isUtf8mb4Supported(DB $db) |
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{ |
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/** |
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* https://make.wordpress.org/core/2015/04/02/the-utf8mb4-upgrade/ |
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* |
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* - You’re currently using the utf8 character set. |
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* - Your MySQL server is version 5.5.3 or higher (including all 10.x versions of MariaDB). |
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* - Your MySQL client libraries are version 5.5.3 or higher. If you’re using mysqlnd, 5.0.9 or higher. |
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* |
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* INFO: utf8mb4 is 100% backwards compatible with utf8. |
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*/ |
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$server_version = self::get_mysql_server_version($db); |
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$client_version = self::get_mysql_client_version($db); |
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if ( |
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$server_version >= 50503 |
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&& |
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( |
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( |
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self::isMysqlndIsUsed() === true |
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&& |
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$client_version >= 50009 |
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) |
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|| |
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( |
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self::isMysqlndIsUsed() === false |
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&& |
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$client_version >= 50503 |
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) |
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) |
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) { |
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return true; |
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} else { |
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return false; |
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} |
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} |
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/** |
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* A string that represents the MySQL client library version. |
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* |
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* @param DB $db |
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* |
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* @return string |
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*/ |
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public static function get_mysql_client_version(DB $db) |
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{ |
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static $_mysqli_client_version = null; |
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if ($_mysqli_client_version === null) { |
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$_mysqli_client_version = mysqli_get_client_version($db->getLink()); |
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} |
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return $_mysqli_client_version; |
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} |
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/** |
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* Returns a string representing the version of the MySQL server that the MySQLi extension is connected to. |
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* |
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* @param DB $db |
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* |
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* @return string |
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*/ |
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public static function get_mysql_server_version(DB $db) |
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{ |
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static $_mysqli_server_version = null; |
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if ($_mysqli_server_version === null) { |
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$_mysqli_server_version = mysqli_get_server_version($db->getLink()); |
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} |
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return $_mysqli_server_version; |
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} |
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/** |
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* Return all db-fields from a table. |
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* |
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* @param string $table |
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* @param bool $useStaticCache |
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* @param DB|null $db |
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* |
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* @return array |
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*/ |
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public static function getDbFields($table, $useStaticCache = true, DB $db = null) |
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{ |
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static $dbFieldsCache = array(); |
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// use the static cache |
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if ( |
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$useStaticCache === true |
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&& |
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isset($dbFieldsCache[$table]) |
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) { |
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return $dbFieldsCache[$table]; |
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} |
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// init |
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$dbFields = array(); |
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if ($db === null) { |
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$db = DB::getInstance(); |
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} |
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$debug = new Debug($db); |
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if ($table === '') { |
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$debug->displayError('invalid table name'); |
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return array(); |
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} |
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$sql = 'SHOW COLUMNS FROM ' . $db->quote_string($table); |
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$result = $db->query($sql); |
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if ($result && $result->num_rows > 0) { |
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foreach ($result->fetchAllArray() as $tmpResult) { |
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$dbFields[] = $tmpResult['Field']; |
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} |
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} |
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// add to static cache |
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$dbFieldsCache[$table] = $dbFields; |
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return $dbFields; |
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} |
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/** |
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* Copy row within a DB table and making updates to the columns. |
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* |
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* @param string $table |
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* @param array $whereArray |
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* @param array $updateArray |
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* @param array $ignoreArray |
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* @param DB|null $db <p>Use <strong>null</strong> |
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* |
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* @return bool|int "int" (insert_id) by "<b>INSERT / REPLACE</b>"-queries<br /> |
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* "false" on error |
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*/ |
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public static function copyTableRow($table, array $whereArray, array $updateArray = array(), array $ignoreArray = array(), DB $db = null) |
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{ |
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// init |
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$table = trim($table); |
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if ($db === null) { |
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$db = DB::getInstance(); |
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} |
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$debug = new Debug($db); |
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if ($table === '') { |
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$debug->displayError('invalid table name'); |
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return false; |
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} |
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$whereSQL = ''; |
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foreach ($whereArray as $key => $value) { |
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$whereSQL .= ' AND ' . $db->escape($key) . ' = ' . $db->escape($value); |
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} |
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// get the row |
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$query = 'SELECT * FROM ' . $db->quote_string($table) . ' |
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WHERE 1 = 1 |
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' . $whereSQL . ' |
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'; |
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$result = $db->query($query); |
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// make sure the row exists |
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if ($result->num_rows > 0) { |
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foreach ($result->fetchAllArray() as $tmpArray) { |
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// re-build a new DB query and ignore some field-names |
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$bindings = array(); |
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$insert_keys = ''; |
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$insert_values = ''; |
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foreach ($tmpArray as $fieldName => $value) { |
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if (!in_array($fieldName, $ignoreArray, true)) { |
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if (array_key_exists($fieldName, $updateArray)) { |
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$insert_keys .= ',' . $fieldName; |
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$insert_values .= ',?'; |
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$bindings[] = $db->escape($updateArray[$fieldName]); |
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} else { |
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$insert_keys .= ',' . $fieldName; |
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$insert_values .= ',?'; |
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$bindings[] = $db->escape($value); |
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} |
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} |
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} |
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$insert_keys = ltrim($insert_keys, ','); |
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$insert_values = ltrim($insert_values, ','); |
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// insert the "copied" row |
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$new_query = 'INSERT INTO ' . $db->quote_string($table) . ' (' . $insert_keys . ') |
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VALUES (' . $insert_values . ') |
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'; |
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return $db->query($new_query, $bindings); |
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} |
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} |
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return false; |
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} |
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} |
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voku /
simple-mysqli
