Class: Mysql2psql::PostgresWriter

Inherits:
Writer
  • Object
show all
Defined in:
lib/mysql2psql/postgres_writer.rb

Direct Known Subclasses

PostgresDbWriter, PostgresFileWriter

Instance Method Summary collapse

Instance Method Details

#column_description(column) ⇒ Object 



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# File 'lib/mysql2psql/postgres_writer.rb', line 8

def column_description(column)
  "#{PGconn.quote_ident(column[:name])} #{column_type_info(column)}"
end

#column_type(column) ⇒ Object 



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# File 'lib/mysql2psql/postgres_writer.rb', line 12

def column_type(column)
  column_type_info(column).split(" ").first
end

#column_type_info(column) ⇒ Object 



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# File 'lib/mysql2psql/postgres_writer.rb', line 16

def column_type_info(column)
  if column[:auto_increment]
    return "integer DEFAULT nextval('#{column[:table_name]}_#{column[:name]}_seq'::regclass) NOT NULL"
  end

  default = column[:default] ? " DEFAULT #{column[:default] == nil ? 'NULL' : "'"+PGconn.escape(column[:default])+"'"}" : nil
  null = column[:null] ? "" : " NOT NULL"
  type = 
  case column[:type]

  # String types
  when "char"
    default = default + "::char" if default
    "character(#{column[:length]})"
  when "varchar"
    default = default + "::character varying" if default
  #      puts "VARCHAR: #{column.inspect}"
    "character varying(#{column[:length]})"
  
  # Integer and numeric types
  when "integer"
    default = " DEFAULT #{column[:default].nil? ? 'NULL' : column[:default].to_i}" if default
    "integer"
  when "bigint"
    default = " DEFAULT #{column[:default].nil? ? 'NULL' : column[:default].to_i}" if default
    "bigint"
  when "tinyint"
    default = " DEFAULT #{column[:default].nil? ? 'NULL' : column[:default].to_i}" if default
    "smallint"

  when "boolean"
    default = " DEFAULT #{column[:default].to_i == 1 ? 'true' : 'false'}" if default
    "boolean"
  when "float"
    default = " DEFAULT #{column[:default].nil? ? 'NULL' : column[:default].to_f}" if default
    "real"
  when "float unsigned"
    default = " DEFAULT #{column[:default].nil? ? 'NULL' : column[:default].to_f}" if default
    "real"
  when "decimal"
    default = " DEFAULT #{column[:default].nil? ? 'NULL' : column[:default]}" if default
    "numeric(#{column[:length] || 10}, #{column[:decimals] || 0})"

  when "double precision"
    default = " DEFAULT #{column[:default].nil? ? 'NULL' : column[:default]}" if default
    "double precision"

  # Mysql datetime fields
  when "datetime"
    default = nil
    "timestamp without time zone"
  when "date"
    default = nil
    "date"
  when "timestamp"
    default = " DEFAULT CURRENT_TIMESTAMP" if column[:default] == "CURRENT_TIMESTAMP"
    default = " DEFAULT '1970-01-01 00:00'" if column[:default] == "0000-00-00 00:00"
    default = " DEFAULT '1970-01-01 00:00:00'" if column[:default] == "0000-00-00 00:00:00"
    "timestamp without time zone"
  when "time"
    default = " DEFAULT NOW()" if default
    "time without time zone"

  when "tinyblob"
    "bytea"
  when "mediumblob"
    "bytea"
  when "longblob"
    "bytea"
  when "blob"
    "bytea"
  when "varbinary"
    "bytea"
  when "tinytext"
    "text"
  when "mediumtext"
    "text"
  when "longtext"
    "text"
  when "text"
    "text"
  when /^enum/
    default = default + "::character varying" if default
    enum = column[:type].gsub(/enum|\(|\)/, '')
    max_enum_size = enum.split(',').map{ |check| check.size() -2}.sort[-1]
    "character varying(#{max_enum_size}) check( #{column[:name]} in (#{enum}))"
  else
    puts "Unknown #{column.inspect}"
    column[:type].inspect
    return ""
  end
  "#{type}#{default}#{null}"
end

#process_row(table, row) ⇒ Object 



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# File 'lib/mysql2psql/postgres_writer.rb', line 110

def process_row(table, row)
	table.columns.each_with_index do |column, index|

      if column[:type] == "time"
        row[index] = "%02d:%02d:%02d" % [row[index].hour, row[index].minute, row[index].second]
      end
    
      if row[index].is_a?(Mysql::Time)
        row[index] = row[index].to_s.gsub('0000-00-00 00:00', '1970-01-01 00:00')
        row[index] = row[index].to_s.gsub('0000-00-00 00:00:00', '1970-01-01 00:00:00')
      end
    
      if column_type(column) == "boolean"
        row[index] = row[index] == 1 ? 't' : row[index] == 0 ? 'f' : row[index]
      end
    
      if row[index].is_a?(String)
        if column_type(column) == "bytea"
          row[index] = PGconn.escape_bytea(row[index])
        else
          row[index] = row[index].gsub(/\\/, '\\\\\\').gsub(/\n/,'\n').gsub(/\t/,'\t').gsub(/\r/,'\r').gsub(/\0/, '')
        end
      end
    
      row[index] = '\N' if !row[index]
    end
end

#truncate(table) ⇒ Object 



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# File 'lib/mysql2psql/postgres_writer.rb', line 138

def truncate(table)
end