Class: Baza::Driver::Mysql::Column

Inherits:
Column
  • Object
show all
Defined in:
lib/baza/driver/mysql/column.rb

Overview

This class handels every MySQL-column, that can be returned from a table-object.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Column

#after, #data, #inspect, #table, #to_param, #to_s

Methods included from Baza::DatabaseModelFunctionality

#model_name, #to_model

Constructor Details

#initialize(args) ⇒ Column

Constructor. Should not be called manually.



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# File 'lib/baza/driver/mysql/column.rb', line 6

def initialize(args)
  @args = args
  @data = @args.delete(:data)
  @name = @data.fetch(:Field)
  @db = @args.fetch(:db)
end

Instance Attribute Details

#args ⇒ Object (readonly)

Returns the value of attribute args.



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# File 'lib/baza/driver/mysql/column.rb', line 3

def args
  @args
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/baza/driver/mysql/column.rb', line 3

def name
  @name
end

Instance Method Details

#__object_unique_id__ ⇒ Object

Used to validate in Wref::Map.



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# File 'lib/baza/driver/mysql/column.rb', line 14

def __object_unique_id__
  @name
end

#autoincr? ⇒ Boolean

Returns true if the column is auto-increasing. Otherwise false.

Returns:

  • (Boolean) 


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# File 'lib/baza/driver/mysql/column.rb', line 97

def autoincr?
  @data.fetch(:Extra).include?("auto_increment")
end

#change(data) ⇒ Object

Changes the column properties by the given hash.



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# File 'lib/baza/driver/mysql/column.rb', line 114

def change(data)
  newdata = data.clone

  newdata[:name] = name unless newdata.key?(:name)
  newdata[:type] = type unless newdata.key?(:type)
  newdata[:maxlength] = maxlength if !newdata.key?(:maxlength) && maxlength
  newdata[:null] = null? unless newdata.key?(:null)
  newdata[:default] = default if !newdata.key?(:default) && default
  newdata.delete(:primarykey) if newdata.key?(:primarykey)

  drop_add = true if name.to_s != newdata[:name].to_s

  table.__send__(:remove_column_from_list, self) if drop_add
  @db.query("ALTER TABLE #{@db.quote_table(table_name)} CHANGE #{@db.quote_column(name)} #{@db.columns.data_sql(newdata)}")
  @name = newdata[:name].to_s
  reload
  table.__send__(:add_column_to_list, self) if drop_add
end

#comment ⇒ Object

Returns the comment for the column.



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# File 'lib/baza/driver/mysql/column.rb', line 102

def comment
  @data.fetch(:Comment)
end

#create_foreign_key(args) ⇒ Object 



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# File 'lib/baza/driver/mysql/column.rb', line 18

def create_foreign_key(args)
  fk_name = args[:name]
  fk_name ||= "fk_#{table_name}_#{name}"

  other_column = args.fetch(:column)
  other_table = other_column.table

  sql = "
    ALTER TABLE #{@db.quote_table(table_name)}
    ADD CONSTRAINT #{@db.escape_table(fk_name)}
    FOREIGN KEY (#{@db.escape_table(name)})
    REFERENCES #{@db.escape_table(other_table.name)} (#{@db.escape_column(other_column.name)})
  "

  @db.query(sql)

  true
end

#default ⇒ Object

Returns the default value for the column.



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# File 'lib/baza/driver/mysql/column.rb', line 84

def default
  return nil if (type == :datetime || type == :date) && @data[:Default].to_s.strip.empty?
  return nil if (type == :int || type == :bigint) && @data[:Default].to_s.strip.empty?
  return nil unless @data[:Default]
  @data.fetch(:Default)
end

#drop ⇒ Object

Drops the column from the table.



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# File 'lib/baza/driver/mysql/column.rb', line 107

def drop
  @db.query("ALTER TABLE #{@db.quote_table(table_name)} DROP COLUMN #{@db.quote_column(name)}")
  table.__send__(:remove_column_from_list, self)
  nil
end

#maxlength ⇒ Object

Returns the maxlength.



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# File 'lib/baza/driver/mysql/column.rb', line 77

def maxlength
  type unless @maxlength
  return @maxlength if @maxlength
  false
end

#null? ⇒ Boolean

Return true if the columns allows null. Otherwise false.

Returns:

  • (Boolean) 


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# File 'lib/baza/driver/mysql/column.rb', line 72

def null?
  @data[:Null] != "NO"
end

#primarykey? ⇒ Boolean

Returns true if the column is the primary key. Otherwise false.

Returns:

  • (Boolean) 


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# File 'lib/baza/driver/mysql/column.rb', line 92

def primarykey?
  @data.fetch(:Key) == "PRI"
end

#reload ⇒ Object

Raises:



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# File 'lib/baza/driver/mysql/column.rb', line 41

def reload
  data = @db.query("SHOW FULL COLUMNS FROM #{@db.quote_table(table_name)} WHERE #{@db.quote_column("Field")} = #{@db.quote_value(name)}").fetch
  raise Baza::Errors::ColumnNotFound unless data
  @data = data
  @type = nil
end

#table_name ⇒ Object 



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# File 'lib/baza/driver/mysql/column.rb', line 37

def table_name
  @args.fetch(:table_name)
end

#type ⇒ Object

Returns the type of the column (integer, varchar etc.).



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# File 'lib/baza/driver/mysql/column.rb', line 49

def type
  unless @type
    if (match = @data.fetch(:Type).match(/^([A-z]+)$/))
      @maxlength = false
      @type = match[0].to_sym
    elsif (match = @data.fetch(:Type).match(/^decimal\((\d+),(\d+)\)$/))
      @maxlength = "#{match[1]},#{match[2]}"
      @type = :decimal
    elsif (match = @data.fetch(:Type).match(/^enum\((.+)\)$/))
      @maxlength = match[1]
      @type = :enum
    elsif (match = @data.fetch(:Type).match(/^(.+)\((\d+)\)/))
      @maxlength = match[2].to_i
      @type = match[1].to_sym
    end

    raise "Still no type from: '#{@data.fetch(:Type)}'" if @type.to_s.strip.empty?
  end

  @type
end