请查看位于以下位置的当前核心数据库适配器文件（Table.php）：
magento-2 /供应商/ magento /框架/ DB / Ddl：
<?php
/**
* Copyright © 2015 Magento. All rights reserved.
* See COPYING.txt for license details.
*/
/**
* Data Definition for table
*
* @author Magento Core Team <core@magentocommerce.com>
*/
namespace Magento\Framework\DB\Ddl;
use Magento\Framework\DB\Adapter\AdapterInterface;
class Table
{
/**
* Types of columns
*/
const TYPE_BOOLEAN = 'boolean';
const TYPE_SMALLINT = 'smallint';
const TYPE_INTEGER = 'integer';
const TYPE_BIGINT = 'bigint';
const TYPE_FLOAT = 'float';
const TYPE_NUMERIC = 'numeric';
const TYPE_DECIMAL = 'decimal';
const TYPE_DATE = 'date';
const TYPE_TIMESTAMP = 'timestamp';
// Capable to support date-time from 1970 + auto-triggers in some RDBMS
const TYPE_DATETIME = 'datetime';
// Capable to support long date-time before 1970
const TYPE_TEXT = 'text';
const TYPE_BLOB = 'blob';
// Used for back compatibility, when query param can't use statement options
const TYPE_VARBINARY = 'varbinary';
// A real blob, stored as binary inside DB
/**
* Default and maximal TEXT and BLOB columns sizes we can support for different DB systems.
*/
const DEFAULT_TEXT_SIZE = 1024;
const MAX_TEXT_SIZE = 2147483648;
const MAX_VARBINARY_SIZE = 2147483648;
/**
* Default values for timestamps - fill with current timestamp on inserting record, on changing and both cases
*/
const TIMESTAMP_INIT_UPDATE = 'TIMESTAMP_INIT_UPDATE';
const TIMESTAMP_INIT = 'TIMESTAMP_INIT';
const TIMESTAMP_UPDATE = 'TIMESTAMP_UPDATE';
/**
* Actions used for foreign keys
*/
const ACTION_CASCADE = 'CASCADE';
const ACTION_SET_NULL = 'SET NULL';
const ACTION_NO_ACTION = 'NO ACTION';
const ACTION_RESTRICT = 'RESTRICT';
const ACTION_SET_DEFAULT = 'SET DEFAULT';
/**
* Name of table
*
* @var string
*/
protected $_tableName;
/**
* Schema name
*
* @var string
*/
protected $_schemaName;
/**
* Comment for Table
*
* @var string
*/
protected $_tableComment;
/**
* Column descriptions for a table
*
* Is an associative array keyed by the uppercase column name
* The value of each array element is an associative array
* with the following keys:
*
* COLUMN_NAME => string; column name
* COLUMN_POSITION => number; ordinal position of column in table
* DATA_TYPE => string; constant datatype of column
* DEFAULT => string; default expression of column, null if none
* NULLABLE => boolean; true if column can have nulls
* LENGTH => number; length of CHAR/VARCHAR/INT
* SCALE => number; scale of NUMERIC/DECIMAL
* PRECISION => number; precision of NUMERIC/DECIMAL
* UNSIGNED => boolean; unsigned property of an integer type
* PRIMARY => boolean; true if column is part of the primary key
* PRIMARY_POSITION => integer; position of column in primary key
* IDENTITY => integer; true if column is auto-generated with unique values
* COMMENT => string; column description
*
* @var array
*/
protected $_columns = [];
/**
* Index descriptions for a table
*
* Is an associative array keyed by the uppercase index name
* The value of each array element is an associative array
* with the following keys:
*
* INDEX_NAME => string; index name
* COLUMNS => array; array of index columns
* TYPE => string; Optional special index type
*
* COLUMNS is an associative array keyed by the uppercase column name
* The value of each COLUMNS array element is an associative array
* with the following keys:
*
* NAME => string; The column name
* SIZE => int|null; Length of index column (always null if index is unique)
* POSITION => int; Position in index
*
* @var array
*/
protected $_indexes = [];
/**
* Foreign key descriptions for a table
*
* Is an associative array keyed by the uppercase foreign key name
* The value of each array element is an associative array
* with the following keys:
*
* FK_NAME => string; The foreign key name
* COLUMN_NAME => string; The column name in table
* REF_TABLE_NAME => string; Reference table name
* REF_COLUMN_NAME => string; Reference table column name
* ON_DELETE => string; Integrity Actions, default NO ACTION
* ON_UPDATE => string; Integrity Actions, default NO ACTION
*
* Valid Integrity Actions:
* CASCADE | SET NULL | NONE | RESTRICT | SET DEFAULT
*
* @var array
*/
protected $_foreignKeys = [];
/**
* Additional table options
*
* @var array
*/
protected $_options = ['type' => 'INNODB', 'charset' => 'utf8', 'collate' => 'utf8_general_ci'];
/**
* Set table name
*
* @param string $name
* @return $this
*/
public function setName($name)
{
$this->_tableName = $name;
if ($this->_tableComment === null) {
$this->_tableComment = $name;
}
return $this;
}
/**
* Set schema name
*
* @param string $name
* @return $this
*/
public function setSchema($name)
{
$this->_schemaName = $name;
return $this;
}
/**
* Set comment for table
*
* @param string $comment
* @return $this
*/
public function setComment($comment)
{
$this->_tableComment = $comment;
return $this;
}
/**
* Retrieve name of table
*
* @return string
* @throws \Zend_Db_Exception
*/
public function getName()
{
if ($this->_tableName === null) {
throw new \Zend_Db_Exception('Table name is not defined');
}
return $this->_tableName;
}
/**
* Get schema name
*
* @return string|null
*/
public function getSchema()
{
return $this->_schemaName;
}
/**
* Return comment for table
*
* @return string
*/
public function getComment()
{
return $this->_tableComment;
}
/**
* Adds column to table.
*
* $options contains additional options for columns. Supported values are:
* - 'unsigned', for number types only. Default: FALSE.
* - 'precision', for numeric and decimal only. Default: taken from $size, if not set there then 0.
* - 'scale', for numeric and decimal only. Default: taken from $size, if not set there then 10.
* - 'default'. Default: not set.
* - 'nullable'. Default: TRUE.
* - 'primary', add column to primary index. Default: do not add.
* - 'primary_position', only for column in primary index. Default: count of primary columns + 1.
* - 'identity' or 'auto_increment'. Default: FALSE.
*
* @param string $name the column name
* @param string $type the column data type
* @param string|int|array $size the column length
* @param array $options array of additional options
* @param string $comment column description
* @return $this
* @throws \Zend_Db_Exception
* @SuppressWarnings(PHPMD.CyclomaticComplexity)
* @SuppressWarnings(PHPMD.NPathComplexity)
* @SuppressWarnings(PHPMD.ExcessiveMethodLength)
*/
public function addColumn($name, $type, $size = null, $options = [], $comment = null)
{
$position = count($this->_columns);
$default = false;
$nullable = true;
$length = null;
$scale = null;
$precision = null;
$unsigned = false;
$primary = false;
$primaryPosition = 0;
$identity = false;
// Prepare different properties
switch ($type) {
case self::TYPE_BOOLEAN:
break;
case self::TYPE_SMALLINT:
case self::TYPE_INTEGER:
case self::TYPE_BIGINT:
if (!empty($options['unsigned'])) {
$unsigned = true;
}
break;
case self::TYPE_FLOAT:
if (!empty($options['unsigned'])) {
$unsigned = true;
}
break;
case self::TYPE_DECIMAL:
case self::TYPE_NUMERIC:
$match = [];
$scale = 0;
$precision = 10;
// parse size value
if (is_array($size)) {
if (count($size) == 2) {
$size = array_values($size);
$precision = $size[0];
$scale = $size[1];
}
} elseif (preg_match('#^(\d+),(\d+)$#', $size, $match)) {
$precision = $match[1];
$scale = $match[2];
}
// check options
if (isset($options['precision'])) {
$precision = $options['precision'];
}
if (isset($options['scale'])) {
$scale = $options['scale'];
}
if (!empty($options['unsigned'])) {
$unsigned = true;
}
break;
case self::TYPE_DATE:
case self::TYPE_DATETIME:
case self::TYPE_TIMESTAMP:
break;
case self::TYPE_TEXT:
case self::TYPE_BLOB:
case self::TYPE_VARBINARY:
$length = $size;
break;
default:
throw new \Zend_Db_Exception('Invalid column data type "' . $type . '"');
}
if (array_key_exists('default', $options)) {
$default = $options['default'];
}
if (array_key_exists('nullable', $options)) {
$nullable = (bool)$options['nullable'];
}
if (!empty($options['primary'])) {
$primary = true;
if (isset($options['primary_position'])) {
$primaryPosition = (int)$options['primary_position'];
} else {
$primaryPosition = 0;
foreach ($this->_columns as $v) {
if ($v['PRIMARY']) {
$primaryPosition++;
}
}
}
}
if (!empty($options['identity']) || !empty($options['auto_increment'])) {
$identity = true;
}
if ($comment === null) {
$comment = ucfirst($name);
}
$upperName = strtoupper($name);
$this->_columns[$upperName] = [
'COLUMN_NAME' => $name,
'COLUMN_TYPE' => $type,
'COLUMN_POSITION' => $position,
'DATA_TYPE' => $type,
'DEFAULT' => $default,
'NULLABLE' => $nullable,
'LENGTH' => $length,
'SCALE' => $scale,
'PRECISION' => $precision,
'UNSIGNED' => $unsigned,
'PRIMARY' => $primary,
'PRIMARY_POSITION' => $primaryPosition,
'IDENTITY' => $identity,
'COMMENT' => $comment,
];
return $this;
}
/**
* Add Foreign Key to table
*
* @param string $fkName the foreign key name
* @param string $column the foreign key column name
* @param string $refTable the reference table name
* @param string $refColumn the reference table column name
* @param string $onDelete the action on delete row
* @return $this
* @throws \Zend_Db_Exception
* @SuppressWarnings(PHPMD.CyclomaticComplexity)
*/
public function addForeignKey($fkName, $column, $refTable, $refColumn, $onDelete = null)
{
$upperName = strtoupper($fkName);
// validate column name
if (!isset($this->_columns[strtoupper($column)])) {
throw new \Zend_Db_Exception('Undefined column "' . $column . '"');
}
switch ($onDelete) {
case self::ACTION_CASCADE:
case self::ACTION_RESTRICT:
case self::ACTION_SET_DEFAULT:
case self::ACTION_SET_NULL:
break;
default:
$onDelete = self::ACTION_NO_ACTION;
}
$this->_foreignKeys[$upperName] = [
'FK_NAME' => $fkName,
'COLUMN_NAME' => $column,
'REF_TABLE_NAME' => $refTable,
'REF_COLUMN_NAME' => $refColumn,
'ON_DELETE' => $onDelete
];
return $this;
}
/**
* Add index to table
*
* @param string $indexName the index name
* @param array|string $fields array of columns or column string
* @param array $options array of additional options
* @return $this
* @throws \Zend_Db_Exception
* @SuppressWarnings(PHPMD.CyclomaticComplexity)
*/
public function addIndex($indexName, $fields, $options = [])
{
$idxType = AdapterInterface::INDEX_TYPE_INDEX;
$position = 0;
$columns = [];
if (!is_array($fields)) {
$fields = [$fields];
}
foreach ($fields as $columnData) {
$columnSize = null;
$columnPos = $position;
if (is_string($columnData)) {
$columnName = $columnData;
} elseif (is_array($columnData)) {
if (!isset($columnData['name'])) {
throw new \Zend_Db_Exception('Invalid index column data');
}
$columnName = $columnData['name'];
if (!empty($columnData['size'])) {
$columnSize = (int)$columnData['size'];
}
if (!empty($columnData['position'])) {
$columnPos = (int)$columnData['position'];
}
} else {
continue;
}
$columns[strtoupper(
$columnName
)] = [
'NAME' => $columnName,
'SIZE' => $columnSize,
'POSITION' => $columnPos,
];
$position++;
}
if (empty($columns)) {
throw new \Zend_Db_Exception('Columns for index are not defined');
}
if (!empty($options['type'])) {
$idxType = $options['type'];
}
$this->_indexes[strtoupper(
$indexName
)] = [
'INDEX_NAME' => $indexName,
'COLUMNS' => $this->_normalizeIndexColumnPosition($columns),
'TYPE' => $idxType,
];
return $this;
}
/**
* Retrieve array of table columns
*
* @param bool $normalized
* @see $this->_columns
* @return array
*/
public function getColumns($normalized = true)
{
if ($normalized) {
return $this->_normalizeColumnPosition($this->_columns);
}
return $this->_columns;
}
/**
* Set column, formatted according to DDL Table format, into columns structure
*
* @param array $column
* @see $this->_columns
* @return $this
*/
public function setColumn($column)
{
$upperName = strtoupper($column['COLUMN_NAME']);
$this->_columns[$upperName] = $column;
return $this;
}
/**
* Retrieve array of table indexes
*
* @see $this->_indexes
* @return array
*/
public function getIndexes()
{
return $this->_indexes;
}
/**
* Retrieve array of table foreign keys
*
* @see $this->_foreignKeys
* @return array
*/
public function getForeignKeys()
{
return $this->_foreignKeys;
}
/**
* Set table option
*
* @param string $key
* @param string $value
* @return $this
*/
public function setOption($key, $value)
{
$this->_options[$key] = $value;
return $this;
}
/**
* Retrieve table option value by option name
* Return null if option does not exits
*
* @param string $key
* @return null|string
*/
public function getOption($key)
{
if (!isset($this->_options[$key])) {
return null;
}
return $this->_options[$key];
}
/**
* Retrieve array of table options
*
* @return array
*/
public function getOptions()
{
return $this->_options;
}
/**
* Index column position comparison function
*
* @param array $a
* @param array $b
* @return int
*/
protected function _sortIndexColumnPosition($a, $b)
{
return $a['POSITION'] - $b['POSITION'];
}
/**
* table column position comparison function
*
* @param array $a
* @param array $b
* @return int
*/
protected function _sortColumnPosition($a, $b)
{
return $a['COLUMN_POSITION'] - $b['COLUMN_POSITION'];
}
/**
* Normalize positon of index columns array
*
* @param array $columns
* @return array
*/
protected function _normalizeIndexColumnPosition($columns)
{
uasort($columns, [$this, '_sortIndexColumnPosition']);
$position = 0;
foreach (array_keys($columns) as $columnId) {
$columns[$columnId]['POSITION'] = $position;
$position++;
}
return $columns;
}
/**
* Normalize positon of table columns array
*
* @param array $columns
* @return array
*/
protected function _normalizeColumnPosition($columns)
{
uasort($columns, [$this, '_sortColumnPosition']);
$position = 0;
foreach (array_keys($columns) as $columnId) {
$columns[$columnId]['COLUMN_POSITION'] = $position;
$position++;
}
return $columns;
}
}这是否意味着没有准备在Magento 2的任何表中添加“ VARCHAR”类型字段？
那么，任何人都可以提出建议，如何覆盖此文件以允许使用安装脚本添加和升级“ VARCHAR”类型字段？