Class: Mysql2psql::MysqlReader::Table

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

Constant Summary collapse

@@types = 
%w(tiny enum decimal short long float double null timestamp longlong int24 date time datetime year set blob string var_string char).inject({}) do |list, type|
  list[eval("::Mysql::Field::TYPE_#{type.upcase}")] = type
  list
end

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(reader, name) ⇒ Table

Returns a new instance of Table.



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

def initialize(reader, name)
  @reader = reader
  @name = name
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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

def name
  @name
end

Instance Method Details

#columns ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 24

def columns
  @columns ||= load_columns
end

#convert_type(type) ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 28

def convert_type(type)
  case type
  when /int.* unsigned/
    "bigint"
  when /bigint/
    "bigint"
  when "bit(1)"
    "boolean"
  when "tinyint(1)"
    "boolean"
  when /tinyint/
    "tinyint"
  when /int/
    "integer"
  when /varchar/
    "varchar"
  when /char/
    "char"
  when /(float|decimal)/
    "decimal"
  when /double/
     "double precision"
  else
    type
  end 
end

#count_for_pager ⇒ Object 



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

def count_for_pager
  query = has_id? ? 'MAX(id)' : 'COUNT(*)'
  @reader.mysql.query("SELECT #{query} FROM `#{name}`") do |res|
    return res.fetch_row[0].to_i
  end
end

#count_rows ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 127

def count_rows
  @reader.mysql.query("SELECT COUNT(*) FROM `#{name}`")  do |res|
    return res.fetch_row[0].to_i
  end
end

#foreign_keys ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 93

def foreign_keys
  load_indexes unless @foreign_keys
  @foreign_keys
end

#has_id? ⇒ Boolean

Returns:

  • (Boolean) 


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

def has_id?
  !!columns.find {|col| col[:name] == "id"} 
end

#indexes ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 88

def indexes
  load_indexes unless @indexes
  @indexes 
end

#load_columns ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 55

def load_columns
  @reader.reconnect
  result = @reader.mysql.list_fields(name)
  mysql_flags = ::Mysql::Field.constants.select {|c| c =~ /FLAG/}
  fields = []
  @reader.mysql.query("EXPLAIN `#{name}`") do |res|
    while field = res.fetch_row do
      length = field[1][/\((\d+)\)/, 1] if field[1] =~ /\((\d+)\)/
      length = field[1][/\((\d+),(\d+)\)/, 1] if field[1] =~ /\((\d+),(\d+)\)/
      desc = {
        :name => field[0],
        :table_name => name,
        :type => convert_type(field[1]),
        :length => length && length.to_i,
        :decimals => field[1][/\((\d+),(\d+)\)/, 2],
        :null => field[2] == "YES",
        :primary_key => field[3] == "PRI",
        :auto_increment => field[5] == "auto_increment"
        }
      desc[:default] = field[4] unless field[4].nil?
      fields << desc
    end
  end
 
  fields.select {|field| field[:auto_increment]}.each do |field|
    @reader.mysql.query("SELECT max(`#{field[:name]}`) FROM `#{name}`") do |res|
      field[:maxval] = res.fetch_row[0].to_i
    end
  end
  fields
end

#load_indexes ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 98

def load_indexes
  @indexes = []
  @foreign_keys = []

  @reader.mysql.query("SHOW CREATE TABLE `#{name}`") do |result|
    explain = result.fetch_row[1]
    explain.split(/\n/).each do |line|
      next unless line =~ / KEY /
      index = {}
      if match_data = /CONSTRAINT `(\w+)` FOREIGN KEY \(`(\w+)`\) REFERENCES `(\w+)` \(`(\w+)`\)/.match(line)
        index[:name] = match_data[1]
        index[:column] = match_data[2]
        index[:ref_table] = match_data[3]
        index[:ref_column] = match_data[4]
        @foreign_keys << index
      elsif match_data = /KEY `(\w+)` \((.*)\)/.match(line)
        index[:name] = match_data[1]
        index[:columns] = match_data[2].split(",").map {|col| col[/`(\w+)`/, 1]}
        index[:unique] = true if line =~ /UNIQUE/
        @indexes << index
      elsif match_data = /PRIMARY KEY .*\((.*)\)/.match(line)
        index[:primary] = true
        index[:columns] = match_data[1].split(",").map {|col| col.strip.gsub(/`/, "")}
        @indexes << index
      end
    end
  end
end

#query_for_pager ⇒ Object 



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# File 'lib/mysql2psql/mysql_reader.rb', line 144

def query_for_pager
  query = has_id? ? 'WHERE id >= ? AND id < ?' : 'LIMIT ?,?'
  "SELECT #{columns.map{|c| "`"+c[:name]+"`"}.join(", ")} FROM `#{name}` #{query}"
end