Class: DataMapper::Adapters::Sqlite3Adapter::Mappings::Column

Inherits:
Object
  • Object
show all
Defined in:
lib/data_mapper/adapters/sqlite3_adapter.rb

Overview

class Table

Instance Method Summary collapse

Instance Method Details

#alter! ⇒ Object 



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# File 'lib/data_mapper/adapters/sqlite3_adapter.rb', line 85

def alter!
  @adapter.connection do |db|
    flush_sql_caches!
    backup_table = @adapter.table("#{@table.name}_backup")

    @table.columns.each do |column|
      backup_table.add_column(column.name, column.type, column.options)
    end

    backup_table.temporary = true

    backup_table.create!
    
    sql = <<-EOS.compress_lines
      INSERT INTO #{backup_table.to_sql} SELECT #{@table.columns.map { |c| c.to_sql }.join(', ')} FROM #{@table.to_sql};
      DROP TABLE #{@table.to_sql};
      #{@table.to_create_sql};
      INSERT INTO #{@table.to_sql} SELECT #{backup_table.columns.map { |c| c.to_sql }.join(', ')} FROM #{backup_table.to_sql};
    EOS
    
    sql.split(';').each do |part|
      db.create_command(part).execute_non_query
    end
    
    backup_table.drop!
    flush_sql_caches!
  end
end

#drop! ⇒ Object 



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# File 'lib/data_mapper/adapters/sqlite3_adapter.rb', line 114

def drop!
  @adapter.connection do |db|
    @table.columns.delete(self)
    flush_sql_caches!
    
    backup_table = @adapter.table("#{@table.name}_backup")
    
    @table.columns.each do |column|
      backup_table.add_column(column.name, column.type, column.options)
    end

    backup_table.temporary = true

    backup_table.create!
    
    sql = <<-EOS.compress_lines
      INSERT INTO #{backup_table.to_sql} SELECT #{@table.columns.map { |c| c.to_sql }.join(', ')} FROM #{@table.to_sql};
      DROP TABLE #{@table.to_sql};
      #{@table.to_create_sql};
      INSERT INTO #{@table.to_sql} SELECT #{backup_table.columns.map { |c| c.to_sql }.join(', ')} FROM #{backup_table.to_sql};
    EOS
    
    sql.split(';').each do |part|
      db.create_command(part).execute_non_query
    end
    
    backup_table.drop!
    flush_sql_caches!
  end
end

#serial_declaration ⇒ Object 



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# File 'lib/data_mapper/adapters/sqlite3_adapter.rb', line 77

def serial_declaration
  "AUTOINCREMENT"
end

#size ⇒ Object 



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# File 'lib/data_mapper/adapters/sqlite3_adapter.rb', line 81

def size
  nil
end