Class: Mysql2psql::PostgresDbWriter

Inherits:
PostgresWriter show all
Defined in:
lib/mysql2psql/postgres_db_writer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from PostgresWriter

#column_description, #column_type, #column_type_info, #process_row, #truncate

Constructor Details

#initialize(options) ⇒ PostgresDbWriter

Returns a new instance of PostgresDbWriter.



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 10

def initialize(options)
  @hostname, @login, @password, @database, @port =  
    options.pghostname('localhost'), options.pgusername, 
    options.pgpassword, options.pgdatabase, options.pgport(5432).to_s
  @database, @schema = database.split(":")
  open
end

Instance Attribute Details

#conn ⇒ Object (readonly)

Returns the value of attribute conn.



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

def conn
  @conn
end

#database ⇒ Object (readonly)

Returns the value of attribute database.



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

def database
  @database
end

#hostname ⇒ Object (readonly)

Returns the value of attribute hostname.



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

def hostname
  @hostname
end

#login ⇒ Object (readonly)

Returns the value of attribute login.



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

def 
  @login
end

#password ⇒ Object (readonly)

Returns the value of attribute password.



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

def password
  @password
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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

def port
  @port
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



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

def schema
  @schema
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 27

def close
  @conn.close
end

#exists?(relname) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mysql2psql/postgres_db_writer.rb', line 31

def exists?(relname)
  rc = @conn.exec("SELECT COUNT(*) FROM pg_class WHERE relname = '#{relname}'")
  (!rc.nil?) && (rc.to_a.length==1) && (rc.first.count.to_i==1)
end

#format_eta(t) ⇒ Object 



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 133

def format_eta (t)
  t = t.to_i
  sec = t % 60
  min = (t / 60) % 60
  hour = t / 3600
  sprintf("%02dh:%02dm:%02ds", hour, min, sec)
end

#open ⇒ Object 



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 18

def open
  @conn = PGconn.new(hostname, port, '', '', database, , password)
  @conn.exec("SET search_path TO #{PGconn.quote_ident(schema)}") if schema
  @conn.exec("SET client_encoding = 'UTF8'")
  @conn.exec("SET standard_conforming_strings = off") if @conn.server_version >= 80200
  @conn.exec("SET check_function_bodies = false")
  @conn.exec("SET client_min_messages = warning")    
end

#write_constraints(table) ⇒ Object 



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 122

def write_constraints(table)
  table.foreign_keys.each do |key|
    key_sql = "ALTER TABLE #{PGconn.quote_ident(table.name)} ADD FOREIGN KEY (#{PGconn.quote_ident(key[:column])}) REFERENCES #{PGconn.quote_ident(key[:ref_table])}(#{PGconn.quote_ident(key[:ref_column])})"
    begin
      @conn.exec(key_sql)
    rescue Exception => e
      puts "Error: \n#{key_sql}\n#{e}"
    end
  end
end

#write_contents(table, reader) ⇒ Object 



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 141

def write_contents(table, reader)
  _time1 = Time.now
  copy_line = "COPY #{PGconn.quote_ident(table.name)} (#{table.columns.map {|column| PGconn.quote_ident(column[:name])}.join(", ")}) FROM stdin;"
  @conn.exec(copy_line)
  puts "Counting rows of #{table.name}... "
  STDOUT.flush
  rowcount = table.count_rows
  puts "Rows counted"
  puts "Loading #{table.name}..."
  STDOUT.flush
  _counter = reader.paginated_read(table, 1000) do |row, counter|
    line = []
    process_row(table, row)
    @conn.put_copy_data(row.join("\t") + "\n")
     
    if counter != 0 && counter % 20000 == 0
      elapsedTime = Time.now - _time1
      eta = elapsedTime * rowcount / counter - elapsedTime
      etaf = self.format_eta(eta)
      etatimef = (Time.now + eta).strftime("%Y/%m/%d %H:%M")
      printf "\r#{counter} of #{rowcount} rows loaded. [ETA: #{etatimef} (#{etaf})]"
      STDOUT.flush
    end
    
    if counter % 5000 == 0
      @conn.put_copy_end
      @conn.exec(copy_line)
    end
     
  end
  _time2 = Time.now
  puts "\n#{_counter} rows loaded in #{((_time2 - _time1) / 60).round}min #{((_time2 - _time1) % 60).round}s"
#    @conn.putline(".\n")
  @conn.put_copy_end
end

#write_indexes(table) ⇒ Object 



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 87

def write_indexes(table)
  puts "Indexing table #{table.name}..."
  if primary_index = table.indexes.find {|index| index[:primary]}
    @conn.exec("ALTER TABLE #{PGconn.quote_ident(table.name)} ADD CONSTRAINT \"#{table.name}_pkey\" PRIMARY KEY(#{primary_index[:columns].map {|col| PGconn.quote_ident(col)}.join(", ")})")
  end
  
  table.indexes.each do |index|
    next if index[:primary]
    unique = index[:unique] ? "UNIQUE " : nil
    
    #MySQL allows an index name which could be equal to a table name, Postgres doesn't
    indexname = index[:name]
    if indexname.eql?(table.name)
      indexnamenew = "#{indexname}_index"
      puts "WARNING: index \"#{indexname}\" equals table name. This is not allowed by postgres and will be renamed to \"#{indexnamenew}\""
      indexname = indexnamenew
    end
    
    if @conn.server_version < 80200
      @conn.exec("DROP INDEX #{PGconn.quote_ident(indexname)} CASCADE;") if exists?(indexname)
    else
      @conn.exec("DROP INDEX IF EXISTS #{PGconn.quote_ident(indexname)} CASCADE;")
    end
    @conn.exec("CREATE #{unique}INDEX #{PGconn.quote_ident(indexname)} ON #{PGconn.quote_ident(table.name)} (#{index[:columns].map {|col| PGconn.quote_ident(col)}.join(", ")});")
  end
  
  
  #@conn.exec("VACUUM FULL ANALYZE #{PGconn.quote_ident(table.name)}")
  puts "Indexed table #{table.name}"
rescue Exception => e
  puts "Couldn't create indexes on #{table} (#{table.indexes.inspect})"
  puts e
  puts e.backtrace[0,3].join("\n")
end

#write_table(table) ⇒ Object 



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# File 'lib/mysql2psql/postgres_db_writer.rb', line 36

def write_table(table)
  puts "Creating table #{table.name}..."
  primary_keys = []
  serial_key = nil
  maxval = nil
  
  columns = table.columns.map do |column|
    if column[:auto_increment]
      serial_key = column[:name]
      maxval = column[:maxval].to_i < 1 ? 1 : column[:maxval] + 1
    end
    if column[:primary_key]
      primary_keys << column[:name]
    end
    "  " + column_description(column)
  end.join(",\n")
  
  if serial_key
    if @conn.server_version < 80200
      serial_key_seq = "#{table.name}_#{serial_key}_seq"
      @conn.exec("DROP SEQUENCE #{serial_key_seq} CASCADE") if exists?(serial_key_seq)
    else
      @conn.exec("DROP SEQUENCE IF EXISTS #{table.name}_#{serial_key}_seq CASCADE")
    end
    @conn.exec <<-EOF
      CREATE SEQUENCE #{table.name}_#{serial_key}_seq
      INCREMENT BY 1
      NO MAXVALUE
      NO MINVALUE
      CACHE 1
    EOF
  
    @conn.exec "SELECT pg_catalog.setval('#{table.name}_#{serial_key}_seq', #{maxval}, true)"
  end
  
  if @conn.server_version < 80200
    @conn.exec "DROP TABLE #{PGconn.quote_ident(table.name)} CASCADE;" if exists?(table.name)
  else
    @conn.exec "DROP TABLE IF EXISTS #{PGconn.quote_ident(table.name)} CASCADE;"
  end
  create_sql = "CREATE TABLE #{PGconn.quote_ident(table.name)} (\n" + columns + "\n)\nWITHOUT OIDS;"
  begin
    @conn.exec(create_sql)
  rescue Exception => e
    puts "Error: \n#{create_sql}"
    raise
  end
  puts "Created table #{table.name}"
 
end