Class: Mysql2psql::PostgresFileWriter

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

Instance Method Summary collapse

Methods inherited from PostgresWriter

#column_description, #column_type, #column_type_info, #process_row

Constructor Details

#initialize(file) ⇒ PostgresFileWriter

Returns a new instance of PostgresFileWriter.



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# File 'lib/mysql2psql/postgres_file_writer.rb', line 6

def initialize(file)
  @f = File.open(file, "w+")
  @f << "-- MySQL 2 PostgreSQL dump\\n\nSET client_encoding = 'UTF8';\nSET standard_conforming_strings = off;\nSET check_function_bodies = false;\nSET client_min_messages = warning;\n \n"
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/mysql2psql/postgres_file_writer.rb', line 137

def close
  @f.close
end

#truncate(table) ⇒ Object 



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

def truncate(table)
  serial_key = nil
  maxval = nil
  
  table.columns.map do |column|
    if column[:auto_increment]
      serial_key = column[:name]
      maxval = column[:maxval].to_i < 1 ? 1 : column[:maxval] + 1
    end
  end

  @f << "-- TRUNCATE \#{table.name};\nTRUNCATE \#{PGconn.quote_ident(table.name)} CASCADE;\n\n"
  if serial_key
  @f << "SELECT pg_catalog.setval(pg_get_serial_sequence('\#{table.name}', '\#{serial_key}'), \#{maxval}, true);\n"
  end
end

#write_constraints(table) ⇒ Object 



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# File 'lib/mysql2psql/postgres_file_writer.rb', line 112

def write_constraints(table)
  table.foreign_keys.each do |key|
    @f << "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])});\n"
  end
end

#write_contents(table, reader) ⇒ Object 



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# File 'lib/mysql2psql/postgres_file_writer.rb', line 119

def write_contents(table, reader)
  @f << "--\n-- Data for Name: \#{table.name}; Type: TABLE DATA; Schema: public\n--\n\nCOPY \"\#{table.name}\" (\#{table.columns.map {|column| PGconn.quote_ident(column[:name])}.join(\", \")}) FROM stdin;\n"
  
  reader.paginated_read(table, 1000) do |row, counter|
    line = []
    process_row(table, row)
    @f << row.join("\t") + "\n"
  end
  @f << "\\.\n\n"
  #@f << "VACUUM FULL ANALYZE #{PGconn.quote_ident(table.name)};\n\n"
end

#write_indexes(table) ⇒ Object 



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# File 'lib/mysql2psql/postgres_file_writer.rb', line 109

def write_indexes(table)
end

#write_table(table) ⇒ Object 



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# File 'lib/mysql2psql/postgres_file_writer.rb', line 41

def write_table(table)
  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
    
    @f << "--\n-- Name: \#{table.name}_\#{serial_key}_seq; Type: SEQUENCE; Schema: public\n--\n \nDROP SEQUENCE IF EXISTS \#{table.name}_\#{serial_key}_seq CASCADE;\n \nCREATE SEQUENCE \#{table.name}_\#{serial_key}_seq\n  INCREMENT BY 1\n  NO MAXVALUE\n  NO MINVALUE\n  CACHE 1;\n  \n  \nSELECT pg_catalog.setval('\#{table.name}_\#{serial_key}_seq', \#{maxval}, true);\n \n    EOF\n  end\n  \n  @f << <<-EOF\n-- Table: \#{table.name}\n \n-- DROP TABLE \#{table.name};\nDROP TABLE IF EXISTS \#{PGconn.quote_ident(table.name)} CASCADE;\n \nCREATE TABLE \#{PGconn.quote_ident(table.name)} (\n"

  @f << columns
 
  if primary_index = table.indexes.find {|index| index[:primary]}
    @f << ",\n  CONSTRAINT #{table.name}_pkey PRIMARY KEY(#{primary_index[:columns].map {|col| PGconn.quote_ident(col)}.join(", ")})"
  end
  
  @f << "\\n)\nWITHOUT OIDS;\n"

  table.indexes.each do |index|
    next if index[:primary]
    unique = index[:unique] ? "UNIQUE " : nil
    @f << "DROP INDEX IF EXISTS \#{PGconn.quote_ident(index[:name])} CASCADE;\nCREATE \#{unique}INDEX \#{PGconn.quote_ident(index[:name])} ON \#{PGconn.quote_ident(table.name)} (\#{index[:columns].map {|col| PGconn.quote_ident(col)}.join(\", \")});\n"
  end
 
end