Class: Command

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command, connection) ⇒ Command

Returns a new instance of Command.



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# File 'lib/command.rb', line 3

def initialize(command, connection)
  @connection = connection
  @command = command.strip.downcase
  @processed = false
end

Instance Attribute Details

#processed ⇒ Object (readonly)

Returns the value of attribute processed.



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# File 'lib/command.rb', line 9

def processed
  @processed
end

Class Method Details

.go?(command) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/command.rb', line 11

def self.go?(command)
  command.strip.downcase == "go"
end

Instance Method Details

#exec ⇒ Object 



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# File 'lib/command.rb', line 23

def exec
  parse
  @processed || go? || exit?
end

#exit? ⇒ Boolean

Returns:

  • (Boolean) 


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

def exit?
  @command == ".exit" || @command == ".quit"
end

#explain_object(schema, object) ⇒ Object 



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# File 'lib/command.rb', line 102

def explain_object(schema, object)
  sql = <<-EOS
declare @object_id int, @type varchar(2), @name varchar(255)

select @object_id = o.object_id, @type = o.type, @name = s.name + '.' + o.name
from sys.objects o
inner join sys.schemas s on o.schema_id = s.schema_id
where s.name = '#{schema}' and o.name = '#{object}'

--finding object with like in name, possibly confusing, so comment out
--if @object_id is null
--  select top 1 @object_id = o.object_id, @type = o.type, @name = s.name + '.' + o.name
--  from sys.objects o
--  inner join sys.schemas s on o.schema_id = s.schema_id
--  where s.name = '#{schema}' and o.name like '#{object}%'
--  order by s.schema_id, o.name

if @object_id is not null
if @type = 'U'
  exec sp_help @name
else
  select text from syscomments where id = @object_id
else
  select 'object not found'
EOS

  QueryOutput.new(@connection, sql).show_text_or_table
  @processed = true
end

#find(types, name) ⇒ Object 



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# File 'lib/command.rb', line 57

def find(types, name)
  types = "'TF', 'IF', 'FN', 'P', 'V', 'U'" if types.nil?
  sql = <<-EOS
  	select 
  		--db_name() [database],
  		case when type in ('TF', 'IF', 'FN') then 'function'
  			when type in ('P') then 'procedure'
  			when type in ('V') then 'view'
  			when type in ('U') then 'table'
  			else '???'
  		end type,
  		s.name [schema],
  		o.name
  	from sys.objects o
  	inner join sys.schemas s on o.schema_id = s.schema_id
  	where 
  		type in ( #{types} )
  		and is_ms_shipped = 0
      
      and s.name + "." + o.name like '%#{name}%'
  	order by 
  		case when o.schema_id = 1 then 0 else 1 end, --prvo dbo schema
  		case when type in ('TF', 'IF', 'FN') then 4
  			when type in ('P') then 3
  			when type in ('V') then 2
  			when type in ('U') then 1
  			else 100
  		end,		
  		s.name, o.name
EOS
  QueryOutput.new(@connection, sql).show
  @processed = true
end

#go? ⇒ Boolean

Returns:

  • (Boolean) 


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

def go?
  @command == "go" || @command.start_with?(".use")
end

#parse ⇒ Object 



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# File 'lib/command.rb', line 28

def parse    
  cp = CommandParser.new(@command)
  @processed = cp.is_command?
  return unless cp.is_command?
  case cp.command
    when :find
    types = nil
    p = cp.params[0]
    if p
      types = "'U'" if p.start_with?("table")
      types = "'V'" if p.start_with?("view")
      types = "'P'" if p.start_with?("procedure")
      types = "'TF', 'IF', 'FN'" if p.start_with?("function")
    end
    find(types, types.nil? ? cp.params[0].to_s + cp.params[1].to_s : cp.params[1])  
    when :explain
    if cp.params[1].nil? || cp.params[1].empty?
      schema = 'dbo'
      object = cp.params[0]
    else
      schema = cp.params[0]
      object = cp.params[1]
    end
    explain_object schema, object
    when :use
    @connection.use cp.params[0]
  end
end

#show_tables ⇒ Object 



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# File 'lib/command.rb', line 91

def show_tables
  sql = <<-EOS
    select schemas.name + '.' +  tables.name table_name
    from sys.tables 
    inner join sys.schemas on schemas.schema_id = tables.schema_id
    order by 1
EOS
  QueryOutput.new(@connection, sql).show
  @processed = true
end