# Class yii\db\mysql\ColumnSchema

Inheritance | yii\db\mysql\ColumnSchema » yii\db\ColumnSchema » yii\base\BaseObject
Implements | yii\base\Configurable
Available since version | 2.0.14.1
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/db/mysql/ColumnSchema.php

Class ColumnSchema for MySQL database

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$allowNull | boolean | Whether this column can be null. | yii\db\ColumnSchema
$autoIncrement | boolean | Whether this column is auto-incremental | yii\db\ColumnSchema
$comment | string | Comment of this column. | yii\db\ColumnSchema
$dbType | string | The DB type of this column. | yii\db\ColumnSchema
$defaultValue | mixed | Default value of this column | yii\db\ColumnSchema
$disableJsonSupport | boolean | Whether the column schema should OMIT using JSON support feature. | yii\db\mysql\ColumnSchema
$enumValues | array | Enumerable values. | yii\db\ColumnSchema
$isPrimaryKey | boolean | Whether this column is a primary key | yii\db\ColumnSchema
$name | string | Name of this column (without quotes). | yii\db\ColumnSchema
$phpType | string | The PHP type of this column. | yii\db\ColumnSchema
$precision | integer | Precision of the column data, if it is numeric. | yii\db\ColumnSchema
$scale | integer | Scale of the column data, if it is numeric. | yii\db\ColumnSchema
$size | integer | Display size of the column. | yii\db\ColumnSchema
$type | string | Abstract type of this column. | yii\db\ColumnSchema
$unsigned | boolean | Whether this column is unsigned. | yii\db\ColumnSchema

## Public Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
__call() | Calls the named method which is not a class method. | yii\base\BaseObject
__construct() | Constructor. | yii\base\BaseObject
__get() | Returns the value of an object property. | yii\base\BaseObject
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\BaseObject
__set() | Sets value of an object property. | yii\base\BaseObject
__unset() | Sets an object property to null. | yii\base\BaseObject
canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\BaseObject
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\BaseObject
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
dbTypecast() | Converts the input value according to $type and $dbType for use in a db query. | yii\db\mysql\ColumnSchema
hasMethod() | Returns a value indicating whether a method is defined. | yii\base\BaseObject
hasProperty() | Returns a value indicating whether a property is defined. | yii\base\BaseObject
init() | Initializes the object. | yii\base\BaseObject
phpTypecast() | Converts the input value according to $phpType after retrieval from the database. | yii\db\mysql\ColumnSchema

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
typecast() | Converts the input value according to $phpType after retrieval from the database. | yii\db\ColumnSchema

## Property Details

$disableJsonSupport public property (available since version 2.0.14.1)
Deprecated Since 2.0.14.1 and will be removed in 2.1.

Whether the column schema should OMIT using JSON support feature. You can use this property to make upgrade to Yii 2.0.14 easier. Default to `false`, meaning JSON support is enabled.

public boolean $disableJsonSupport = false

## Method Details

dbTypecast() public method

Converts the input value according to $type and $dbType for use in a db query.

If the value is null or an yii\db\Expression, it will not be converted.

public mixed dbTypecast ( $value )
$value | mixed | Input value
return | mixed | Converted value. This may also be an array containing the value as the first element and the PDO type as the second element.

phpTypecast() public method

Converts the input value according to $phpType after retrieval from the database.

If the value is null or an yii\db\Expression, it will not be converted.

public mixed phpTypecast ( $value )
$value | mixed | Input value
return | mixed | Converted value