Class: Xmysql2psql::PostgresFileWriter

Inherits:
PostgresWriter show all
Defined in:
lib/xmysql2psql/postgres_file_writer.rb

Instance Method Summary collapse

Methods inherited from PostgresWriter

#column_description, #column_type, #column_type_info, #escape_bytea, #process_row

Constructor Details

#initialize(file) ⇒ PostgresFileWriter

Returns a new instance of PostgresFileWriter.



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# File 'lib/xmysql2psql/postgres_file_writer.rb', line 6

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

Instance Method Details

#close ⇒ Object 



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# File 'lib/xmysql2psql/postgres_file_writer.rb', line 141

def close
  @f.close
end

#db_writer? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/xmysql2psql/postgres_file_writer.rb', line 18

def db_writer?
  false
end

#truncate(table) ⇒ Object 



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# File 'lib/xmysql2psql/postgres_file_writer.rb', line 22

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 << <<-EOF
-- TRUNCATE #{table.name};
TRUNCATE #{PGconn.quote_ident(table.name)} CASCADE;

EOF
  if serial_key
  @f << <<-EOF
SELECT pg_catalog.setval(pg_get_serial_sequence('#{table.name}', '#{serial_key}'), #{maxval}, true);
EOF
  end
end

#write_constraints(table) ⇒ Object 



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# File 'lib/xmysql2psql/postgres_file_writer.rb', line 116

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/xmysql2psql/postgres_file_writer.rb', line 123

def write_contents(table, reader)
  @f << <<-EOF
--
-- Data for Name: #{table.name}; Type: TABLE DATA; Schema: public
--

COPY "#{table.name}" (#{table.columns.map {|column| PGconn.quote_ident(column[:name])}.join(", ")}) FROM stdin;
EOF
  
  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/xmysql2psql/postgres_file_writer.rb', line 113

def write_indexes(table)
end

#write_table(table) ⇒ Object 



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# File 'lib/xmysql2psql/postgres_file_writer.rb', line 45

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

  @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 << <<-EOF
\n)
WITHOUT OIDS;
EOF

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