Class: Db2c::Command

Inherits:
Object
  • Object
show all
Includes:
CONSTANTS
Defined in:
lib/db2c/command.rb

Constant Summary collapse

@@cdb = 
''

Constants included from CONSTANTS

Db2c::CONSTANTS::DTORDER, Db2c::CONSTANTS::DTSELECT

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Command

Returns a new instance of Command.



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# File 'lib/db2c/command.rb', line 7

def initialize input
  if input
    puts "initializing: #{input}" if $DB2CDBG
    @input = input.chomp.strip.gsub(/^db2 /i,'')
    parse unless @input =~ /^(select|update|delete|insert)/i
  end
end

Class Method Details

.execute(command) ⇒ Object 



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# File 'lib/db2c/command.rb', line 96

def self.execute command
  new(command).execute
end

.prompt ⇒ Object 



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# File 'lib/db2c/command.rb', line 89

def self.prompt
  "db2c".tap do |pr|
    pr << "(#{@@cdb})" if @@cdb.length > 0
    pr << " => "
  end
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/db2c/command.rb', line 78

def execute
  puts "executing: #{@input}" if $DB2CDBG
  system 'db2', @input if valid?
  if @input =~ /^connect to (.*)$/i
    @@cdb = $1.downcase
  end
  if @input =~ /^disconnect #{@@cdb}$/i || @input =~ /^connect reset$/i
    @@cdb = ''
  end
end

#help? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/db2c/command.rb', line 70

def help?
  @input =~ /^(help|h|\\help|\\h)$/
end

#history? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/db2c/command.rb', line 66

def history?
  @input =~ /^(history|hist|\\history|\\hist)$/
end

#parse ⇒ Object 



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# File 'lib/db2c/command.rb', line 19

def parse
  @input.gsub! /^use /, 'connect to '

  @input.gsub! /^\\d /, 'describe '
  if @input =~ /describe [^. ]+\.[^.+ ]+/
    @input.gsub! /describe /, 'describe table '
    return
  end

  if @input =~ /^(show|list) databases/ || @input == '\l'
    @input = "list database directory"
    return
  end

  if @input =~ /^\\lt ?(\w*)$/
    @input = "list tables"
    unless $1.empty?
      @input += $1 == "all" ? " for all" : " for schema #{$1}"
    end
    return
  end

  if @input =~ /^\\d([a|s|t|v]) ?(\w*)$/
    @input = DTSELECT
    @input += " where type = '#{$1.upcase}'"
    @input += " and tabschema = '#{$2.upcase}'" unless $2.empty?
    @input += " #{DTORDER}"
    return
  end

  shortcuts
end

#prepend(regex, value) ⇒ Object 



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# File 'lib/db2c/command.rb', line 58

def prepend regex, value
  @input.insert 0, value if @input =~ regex
end

#quit? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/db2c/command.rb', line 62

def quit?
  @input.nil? || @input =~ /^(exit|quit|\\q|\\quit)$/
end

#shortcuts ⇒ Object 



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# File 'lib/db2c/command.rb', line 52

def shortcuts
  prepend /^\-\d+$/, "? sql"
  prepend /^\d+$/, "? "
  prepend /^current.+$/i, "values "
end

#to_s ⇒ Object 



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# File 'lib/db2c/command.rb', line 15

def to_s
  @input
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/db2c/command.rb', line 74

def valid?
  !quit? && !history? && !help?
end