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CDbColumnSchema

Package system.db.schema
Inheritance class CDbColumnSchema » CComponent
Subclasses CCubridColumnSchema, CMssqlColumnSchema, CMysqlColumnSchema, COciColumnSchema, CPgsqlColumnSchema, CSqliteColumnSchema
Since 1.0
Source Code framework/db/schema/CDbColumnSchema.php
CDbColumnSchema class describes the column meta data of a database table.

Public Properties

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PropertyTypeDescriptionDefined By
allowNull boolean whether this column can be null. CDbColumnSchema
autoIncrement boolean whether this column is auto-incremental CDbColumnSchema
comment string comment of this column. CDbColumnSchema
dbType string the DB type of this column. CDbColumnSchema
defaultValue mixed default value of this column CDbColumnSchema
isForeignKey boolean whether this column is a foreign key CDbColumnSchema
isPrimaryKey boolean whether this column is a primary key CDbColumnSchema
name string name of this column (without quotes). CDbColumnSchema
precision integer precision of the column data, if it is numeric. CDbColumnSchema
rawName string raw name of this column. CDbColumnSchema
scale integer scale of the column data, if it is numeric. CDbColumnSchema
size integer size of the column. CDbColumnSchema
type string the PHP type of this column. CDbColumnSchema

Public Methods

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MethodDescriptionDefined By
__call() Calls the named method which is not a class method. CComponent
__get() Returns a property value, an event handler list or a behavior based on its name. CComponent
__isset() Checks if a property value is null. CComponent
__set() Sets value of a component property. CComponent
__unset() Sets a component property to be null. CComponent
asa() Returns the named behavior object. CComponent
attachBehavior() Attaches a behavior to this component. CComponent
attachBehaviors() Attaches a list of behaviors to the component. CComponent
attachEventHandler() Attaches an event handler to an event. CComponent
canGetProperty() Determines whether a property can be read. CComponent
canSetProperty() Determines whether a property can be set. CComponent
detachBehavior() Detaches a behavior from the component. CComponent
detachBehaviors() Detaches all behaviors from the component. CComponent
detachEventHandler() Detaches an existing event handler. CComponent
disableBehavior() Disables an attached behavior. CComponent
disableBehaviors() Disables all behaviors attached to this component. CComponent
enableBehavior() Enables an attached behavior. CComponent
enableBehaviors() Enables all behaviors attached to this component. CComponent
evaluateExpression() Evaluates a PHP expression or callback under the context of this component. CComponent
getEventHandlers() Returns the list of attached event handlers for an event. CComponent
hasEvent() Determines whether an event is defined. CComponent
hasEventHandler() Checks whether the named event has attached handlers. CComponent
hasProperty() Determines whether a property is defined. CComponent
init() Initializes the column with its DB type and default value. CDbColumnSchema
raiseEvent() Raises an event. CComponent
typecast() Converts the input value to the type that this column is of. CDbColumnSchema

Protected Methods

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MethodDescriptionDefined By
extractDefault() Extracts the default value for the column. CDbColumnSchema
extractLimit() Extracts size, precision and scale information from column's DB type. CDbColumnSchema
extractType() Extracts the PHP type from DB type. CDbColumnSchema

Property Details

allowNull property
public boolean $allowNull;

whether this column can be null.

autoIncrement property (available since v1.1.7)
public boolean $autoIncrement;

whether this column is auto-incremental

comment property (available since v1.1.13)
public string $comment;

comment of this column. Default value is empty string which means that no comment has been set for the column. Null value means that RDBMS does not support column comments at all (SQLite) or comment retrieval for the active RDBMS is not yet supported by the framework.

dbType property
public string $dbType;

the DB type of this column.

defaultValue property
public mixed $defaultValue;

default value of this column

isForeignKey property
public boolean $isForeignKey;

whether this column is a foreign key

isPrimaryKey property
public boolean $isPrimaryKey;

whether this column is a primary key

name property
public string $name;

name of this column (without quotes).

precision property
public integer $precision;

precision of the column data, if it is numeric.

rawName property
public string $rawName;

raw name of this column. This is the quoted name that can be used in SQL queries.

scale property
public integer $scale;

scale of the column data, if it is numeric.

size property
public integer $size;

size of the column.

type property
public string $type;

the PHP type of this column.

Method Details

extractDefault() method
protected void extractDefault(mixed $defaultValue)
$defaultValue mixed the default value obtained from metadata
Source Code: framework/db/schema/CDbColumnSchema.php#128 (show)
protected function extractDefault($defaultValue)
{
    $this->defaultValue=$this->typecast($defaultValue);
}

Extracts the default value for the column. The value is typecasted to correct PHP type.

extractLimit() method
protected void extractLimit(string $dbType)
$dbType string the column's DB type
Source Code: framework/db/schema/CDbColumnSchema.php#112 (show)
protected function extractLimit($dbType)
{
    if(strpos($dbType,'(') && preg_match('/\((.*)\)/',$dbType,$matches))
    {
        $values=explode(',',$matches[1]);
        $this->size=$this->precision=(int)$values[0];
        if(isset($values[1]))
            $this->scale=(int)$values[1];
    }
}

Extracts size, precision and scale information from column's DB type.

extractType() method
protected void extractType(string $dbType)
$dbType string DB type
Source Code: framework/db/schema/CDbColumnSchema.php#96 (show)
protected function extractType($dbType)
{
    if(stripos($dbType,'int')!==false && stripos($dbType,'unsigned int')===false)
        $this->type='integer';
    elseif(stripos($dbType,'bool')!==false)
        $this->type='boolean';
    elseif(preg_match('/(real|floa|doub)/i',$dbType))
        $this->type='double';
    else
        $this->type='string';
}

Extracts the PHP type from DB type.

init() method
public void init(string $dbType, mixed $defaultValue)
$dbType string the column's DB type
$defaultValue mixed the default value
Source Code: framework/db/schema/CDbColumnSchema.php#83 (show)
public function init($dbType, $defaultValue)
{
    $this->dbType=$dbType;
    $this->extractType($dbType);
    $this->extractLimit($dbType);
    if($defaultValue!==null)
        $this->extractDefault($defaultValue);
}

Initializes the column with its DB type and default value. This sets up the column's PHP type, size, precision, scale as well as default value.

typecast() method
public mixed typecast(mixed $value)
$value mixed input value
{return} mixed converted value
Source Code: framework/db/schema/CDbColumnSchema.php#138 (show)
public function typecast($value)
{
    if(gettype($value)===$this->type || $value===null || $value instanceof CDbExpression)
        return $value;
    if($value==='' && $this->allowNull)
        return $this->type==='string' ? '' : null;
    switch($this->type)
    {
        case 'string': return (string)$value;
        case 'integer': return (integer)$value;
        case 'boolean': return (boolean)$value;
        case 'double':
        default: return $value;
    }
}

Converts the input value to the type that this column is of.