Class: Amalgalite::Column

Inherits:
Object
  • Object
show all
Defined in:
lib/amalgalite/column.rb

Overview

a class representing the meta information about an SQLite column, this class serves both for general Schema level information, and for result set information from a SELECT query.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(db, table, name, order) ⇒ Column

Create a column with its name and associated table



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# File 'lib/amalgalite/column.rb', line 50

def initialize( db, table, name, order)
  @db                 = db
  @table              = table
  @name               = name
  @order              = Float(order).to_i
  @declared_data_type = nil
  @default_value      = nil
end

Instance Attribute Details

#collation_sequence_name ⇒ Object

the collation sequence name of the column



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# File 'lib/amalgalite/column.rb', line 41

def collation_sequence_name
  @collation_sequence_name
end

#db ⇒ Object

the database name this column belongs to. This will be ‘main’ for the main database, ‘temp’ for the temp database and whatever an attached database was attached as.



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# File 'lib/amalgalite/column.rb', line 22

def db
  @db
end

#declared_data_type ⇒ Object

the declared data type of the column in the original sql that created the column



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# File 'lib/amalgalite/column.rb', line 38

def declared_data_type
  @declared_data_type
end

#default_value ⇒ Object

the default value of the column. This may not have a value and that either means that there is no default value, or one could not be determined.



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# File 'lib/amalgalite/column.rb', line 34

def default_value
  @default_value
end

#name ⇒ Object

the column name



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# File 'lib/amalgalite/column.rb', line 28

def name
  @name
end

#order ⇒ Object

The index (starting with 0) of this column in the table definition or result set



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# File 'lib/amalgalite/column.rb', line 45

def order
  @order
end

#schema ⇒ Object

the schema object this column is associated with



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# File 'lib/amalgalite/column.rb', line 17

def schema
  @schema
end

#table ⇒ Object

the table to which this column belongs



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# File 'lib/amalgalite/column.rb', line 25

def table
  @table
end

Instance Method Details

#auto_increment=(other) ⇒ Object

set whether or not the column is auto increment



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# File 'lib/amalgalite/column.rb', line 90

def auto_increment=( other )
  @auto_increment = Boolean.to_bool( other )
end

#auto_increment? ⇒ Boolean

true if the column is auto increment

Returns:



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# File 'lib/amalgalite/column.rb', line 95

def auto_increment?
  @auto_increment
end

#has_default_value? ⇒ Boolean

true if the column has a default value

Returns:



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# File 'lib/amalgalite/column.rb', line 60

def has_default_value?
  not default_value.nil?
end

#not_null_constraint=(other) ⇒ Object

set whether or not the column has a not null constraint



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# File 'lib/amalgalite/column.rb', line 70

def not_null_constraint=( other )
  @not_null_constraint = Boolean.to_bool( other )
end

#not_null_constraint? ⇒ Boolean

true if the column as a NOT NULL constraint

Returns:



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# File 'lib/amalgalite/column.rb', line 75

def not_null_constraint?
  @not_null_constraint
end

#nullable? ⇒ Boolean

true if the column may have a NULL value

Returns:



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# File 'lib/amalgalite/column.rb', line 65

def nullable?
  @not_null_constraint == false
end

#primary_key=(other) ⇒ Object

set whether or not the column is a primary key column



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# File 'lib/amalgalite/column.rb', line 80

def primary_key=( other )
  @primary_key = Boolean.to_bool( other )
end

#primary_key? ⇒ Boolean

true if the column is a primary key column

Returns:



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# File 'lib/amalgalite/column.rb', line 85

def primary_key?
  @primary_key
end