DbColumn is an object describing a column of a relation in a database.

Properties

Name	Type	Description
relation	DbRelation	Table, view etc. which this column belongs to
name	String	Logical name (identifier) of this column
qName	String	Quoted name of this column, good for SQL (DDL etc.)
comment	String	Comment for this column
reference	DbReference	(if present)
type	String	Name of the data type
typeDef	DbType	The result of DbLang's getTypeDefinition ()
typeDim	String	${type}[(${size}[,${scale}])]
size	int	Maximum size of the data (length for VARCHAR, precision for DECIMAL etc.). The exact meaning (units etc.) and the mere existence meaning depends of the type.
scale	int	For DECIMAL, his synonyms and/or derived types, (NUMERIC etc.) means the length of the fractional part. Must be absent for other types.
default	String	If non-null, this string is to be interpolated into the DEFAULT clause of the corresponding CREATE/ALTER TABLE statement.
nullable	Boolean	false for NOT NULL columns, true otherwise.
min	String	The minimal allowed value. Corresponds to the HTML INPUT's min attribute. May be used in CHECK constraints, forwarded to UI components etc.
max	String	The maximal allowed value. Corresponds to the HTML INPUT's max attribute. May be used in CHECK constraints, forwarded to UI components etc.
pattern	String	The regular expression to test values against. Corresponds to the HTML INPUT's pattern attribute. May be used in CHECK constraints, forwarded to UI components etc.

Constructor

The 1st parameter is a bag of options, e. g. parsed from the Column Definition Language

const options = new Lang ().parseColumn ('int=0')
// {type: 'int', comment: 'ID', default: '0', nullable: false}

const ref = new DbColumn (options)