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453 lines
13 KiB
PHP
453 lines
13 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db;
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use Yii;
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use yii\base\Object;
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/**
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* ColumnSchemaBuilder helps to define database schema types using a PHP interface.
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*
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* See [[SchemaBuilderTrait]] for more detailed description and usage examples.
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*
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* @author Vasenin Matvey <vaseninm@gmail.com>
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* @since 2.0.6
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*/
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class ColumnSchemaBuilder extends Object
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{
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// Internally used constants representing categories that abstract column types fall under.
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// See [[$categoryMap]] for mappings of abstract column types to category.
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// @since 2.0.8
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const CATEGORY_PK = 'pk';
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const CATEGORY_STRING = 'string';
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const CATEGORY_NUMERIC = 'numeric';
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const CATEGORY_TIME = 'time';
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const CATEGORY_OTHER = 'other';
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/**
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* @var string the column type definition such as INTEGER, VARCHAR, DATETIME, etc.
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*/
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protected $type;
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/**
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* @var int|string|array column size or precision definition. This is what goes into the parenthesis after
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* the column type. This can be either a string, an integer or an array. If it is an array, the array values will
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* be joined into a string separated by comma.
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*/
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protected $length;
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/**
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* @var bool|null whether the column is or not nullable. If this is `true`, a `NOT NULL` constraint will be added.
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* If this is `false`, a `NULL` constraint will be added.
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*/
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protected $isNotNull;
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/**
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* @var bool whether the column values should be unique. If this is `true`, a `UNIQUE` constraint will be added.
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*/
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protected $isUnique = false;
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/**
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* @var string the `CHECK` constraint for the column.
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*/
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protected $check;
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/**
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* @var mixed default value of the column.
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*/
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protected $default;
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/**
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* @var mixed SQL string to be appended to column schema definition.
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* @since 2.0.9
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*/
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protected $append;
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/**
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* @var bool whether the column values should be unsigned. If this is `true`, an `UNSIGNED` keyword will be added.
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* @since 2.0.7
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*/
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protected $isUnsigned = false;
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/**
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* @var string the column after which this column will be added.
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* @since 2.0.8
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*/
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protected $after;
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/**
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* @var bool whether this column is to be inserted at the beginning of the table.
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* @since 2.0.8
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*/
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protected $isFirst;
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/**
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* @var array mapping of abstract column types (keys) to type categories (values).
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* @since 2.0.8
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*/
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public $categoryMap = [
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Schema::TYPE_PK => self::CATEGORY_PK,
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Schema::TYPE_UPK => self::CATEGORY_PK,
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Schema::TYPE_BIGPK => self::CATEGORY_PK,
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Schema::TYPE_UBIGPK => self::CATEGORY_PK,
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Schema::TYPE_CHAR => self::CATEGORY_STRING,
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Schema::TYPE_STRING => self::CATEGORY_STRING,
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Schema::TYPE_TEXT => self::CATEGORY_STRING,
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Schema::TYPE_SMALLINT => self::CATEGORY_NUMERIC,
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Schema::TYPE_INTEGER => self::CATEGORY_NUMERIC,
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Schema::TYPE_BIGINT => self::CATEGORY_NUMERIC,
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Schema::TYPE_FLOAT => self::CATEGORY_NUMERIC,
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Schema::TYPE_DOUBLE => self::CATEGORY_NUMERIC,
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Schema::TYPE_DECIMAL => self::CATEGORY_NUMERIC,
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Schema::TYPE_DATETIME => self::CATEGORY_TIME,
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Schema::TYPE_TIMESTAMP => self::CATEGORY_TIME,
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Schema::TYPE_TIME => self::CATEGORY_TIME,
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Schema::TYPE_DATE => self::CATEGORY_TIME,
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Schema::TYPE_BINARY => self::CATEGORY_OTHER,
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Schema::TYPE_BOOLEAN => self::CATEGORY_NUMERIC,
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Schema::TYPE_MONEY => self::CATEGORY_NUMERIC,
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];
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/**
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* @var \yii\db\Connection the current database connection. It is used mainly to escape strings
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* safely when building the final column schema string.
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* @since 2.0.8
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*/
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public $db;
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/**
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* @var string comment value of the column.
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* @since 2.0.8
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*/
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public $comment;
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/**
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* Create a column schema builder instance giving the type and value precision.
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*
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* @param string $type type of the column. See [[$type]].
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* @param int|string|array $length length or precision of the column. See [[$length]].
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* @param \yii\db\Connection $db the current database connection. See [[$db]].
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* @param array $config name-value pairs that will be used to initialize the object properties
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*/
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public function __construct($type, $length = null, $db = null, $config = [])
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{
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$this->type = $type;
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$this->length = $length;
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$this->db = $db;
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parent::__construct($config);
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}
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/**
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* Adds a `NOT NULL` constraint to the column.
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* @return $this
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*/
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public function notNull()
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{
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$this->isNotNull = true;
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return $this;
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}
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/**
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* Adds a `NULL` constraint to the column
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* @return $this
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* @since 2.0.9
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*/
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public function null()
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{
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$this->isNotNull = false;
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return $this;
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}
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/**
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* Adds a `UNIQUE` constraint to the column.
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* @return $this
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*/
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public function unique()
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{
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$this->isUnique = true;
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return $this;
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}
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/**
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* Sets a `CHECK` constraint for the column.
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* @param string $check the SQL of the `CHECK` constraint to be added.
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* @return $this
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*/
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public function check($check)
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{
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$this->check = $check;
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return $this;
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}
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/**
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* Specify the default value for the column.
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* @param mixed $default the default value.
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* @return $this
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*/
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public function defaultValue($default)
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{
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if ($default === null) {
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$this->null();
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}
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$this->default = $default;
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return $this;
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}
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/**
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* Specifies the comment for column.
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* @param string $comment the comment
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* @return $this
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* @since 2.0.8
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*/
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public function comment($comment)
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{
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$this->comment = $comment;
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return $this;
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}
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/**
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* Marks column as unsigned.
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* @return $this
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* @since 2.0.7
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*/
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public function unsigned()
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{
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switch ($this->type) {
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case Schema::TYPE_PK:
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$this->type = Schema::TYPE_UPK;
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break;
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case Schema::TYPE_BIGPK:
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$this->type = Schema::TYPE_UBIGPK;
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break;
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}
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$this->isUnsigned = true;
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return $this;
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}
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/**
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* Adds an `AFTER` constraint to the column.
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* Note: MySQL, Oracle and Cubrid support only.
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* @param string $after the column after which $this column will be added.
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* @return $this
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* @since 2.0.8
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*/
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public function after($after)
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{
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$this->after = $after;
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return $this;
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}
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/**
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* Adds an `FIRST` constraint to the column.
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* Note: MySQL, Oracle and Cubrid support only.
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* @return $this
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* @since 2.0.8
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*/
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public function first()
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{
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$this->isFirst = true;
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return $this;
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}
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/**
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* Specify the default SQL expression for the column.
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* @param string $default the default value expression.
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* @return $this
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* @since 2.0.7
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*/
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public function defaultExpression($default)
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{
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$this->default = new Expression($default);
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return $this;
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}
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/**
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* Specify additional SQL to be appended to column definition.
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* Position modifiers will be appended after column definition in databases that support them.
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* @param string $sql the SQL string to be appended.
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* @return $this
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* @since 2.0.9
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*/
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public function append($sql)
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{
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$this->append = $sql;
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return $this;
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}
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/**
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* Builds the full string for the column's schema
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* @return string
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*/
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public function __toString()
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{
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switch ($this->getTypeCategory()) {
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case self::CATEGORY_PK:
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$format = '{type}{check}{comment}{append}';
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break;
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default:
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$format = '{type}{length}{notnull}{unique}{default}{check}{comment}{append}';
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}
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return $this->buildCompleteString($format);
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}
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/**
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* Builds the length/precision part of the column.
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* @return string
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*/
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protected function buildLengthString()
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{
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if ($this->length === null || $this->length === []) {
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return '';
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}
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if (is_array($this->length)) {
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$this->length = implode(',', $this->length);
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}
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return "({$this->length})";
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}
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/**
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* Builds the not null constraint for the column.
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* @return string returns 'NOT NULL' if [[isNotNull]] is true,
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* 'NULL' if [[isNotNull]] is false or an empty string otherwise.
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*/
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protected function buildNotNullString()
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{
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if ($this->isNotNull === true) {
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return ' NOT NULL';
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} elseif ($this->isNotNull === false) {
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return ' NULL';
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} else {
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return '';
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}
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}
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/**
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* Builds the unique constraint for the column.
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* @return string returns string 'UNIQUE' if [[isUnique]] is true, otherwise it returns an empty string.
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*/
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protected function buildUniqueString()
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{
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return $this->isUnique ? ' UNIQUE' : '';
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}
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/**
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* Builds the default value specification for the column.
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* @return string string with default value of column.
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*/
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protected function buildDefaultString()
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{
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if ($this->default === null) {
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return $this->isNotNull === false ? ' DEFAULT NULL' : '';
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}
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$string = ' DEFAULT ';
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switch (gettype($this->default)) {
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case 'integer':
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$string .= (string) $this->default;
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break;
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case 'double':
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// ensure type cast always has . as decimal separator in all locales
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$string .= str_replace(',', '.', (string) $this->default);
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break;
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case 'boolean':
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$string .= $this->default ? 'TRUE' : 'FALSE';
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break;
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case 'object':
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$string .= (string) $this->default;
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break;
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default:
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$string .= "'{$this->default}'";
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}
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return $string;
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}
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/**
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* Builds the check constraint for the column.
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* @return string a string containing the CHECK constraint.
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*/
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protected function buildCheckString()
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{
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return $this->check !== null ? " CHECK ({$this->check})" : '';
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}
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/**
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* Builds the unsigned string for column. Defaults to unsupported.
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* @return string a string containing UNSIGNED keyword.
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* @since 2.0.7
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*/
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protected function buildUnsignedString()
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{
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return '';
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}
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/**
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* Builds the after constraint for the column. Defaults to unsupported.
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* @return string a string containing the AFTER constraint.
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* @since 2.0.8
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*/
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protected function buildAfterString()
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{
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return '';
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}
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/**
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* Builds the first constraint for the column. Defaults to unsupported.
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* @return string a string containing the FIRST constraint.
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* @since 2.0.8
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*/
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protected function buildFirstString()
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{
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return '';
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}
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/**
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* Builds the custom string that's appended to column definition.
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* @return string custom string to append.
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* @since 2.0.9
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*/
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protected function buildAppendString()
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{
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return $this->append !== null ? ' ' . $this->append : '';
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}
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/**
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* Returns the category of the column type.
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* @return string a string containing the column type category name.
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* @since 2.0.8
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*/
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protected function getTypeCategory()
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{
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return isset($this->categoryMap[$this->type]) ? $this->categoryMap[$this->type] : null;
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}
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/**
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* Builds the comment specification for the column.
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* @return string a string containing the COMMENT keyword and the comment itself
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* @since 2.0.8
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*/
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protected function buildCommentString()
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{
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return '';
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}
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/**
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* Returns the complete column definition from input format
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* @param string $format the format of the definition.
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* @return string a string containing the complete column definition.
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* @since 2.0.8
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*/
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protected function buildCompleteString($format)
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{
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$placeholderValues = [
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'{type}' => $this->type,
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'{length}' => $this->buildLengthString(),
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'{unsigned}' => $this->buildUnsignedString(),
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'{notnull}' => $this->buildNotNullString(),
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'{unique}' => $this->buildUniqueString(),
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'{default}' => $this->buildDefaultString(),
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'{check}' => $this->buildCheckString(),
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'{comment}' => $this->buildCommentString(),
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'{pos}' => $this->isFirst ? $this->buildFirstString() : $this->buildAfterString(),
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'{append}' => $this->buildAppendString(),
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];
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return strtr($format, $placeholderValues);
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}
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}
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