Class: PgDiff::Diff

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

Instance Method Summary collapse

Constructor Details

#initialize(old_db_spec, new_db_spec) ⇒ Diff

Returns a new instance of Diff.



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

def initialize(old_db_spec, new_db_spec)
  @old_conn = PG::Connection.new(old_db_spec)
  @new_conn = PG::Connection.new(new_db_spec)
  @sections = [
    :domains_drop,
    :domains_create,
    :schemas_drop,
    :schemas_create,
    :tables_drop,
    :tables_change,
    :tables_create,
    :sequences_drop,
    :sequences_create,
    :views_drop,
    :views_create,
    :constraints_drop,
    :constraints_change,
    :constraints_create,
    :indices_drop,
    :indices_create,
    :functions_drop,
    :functions_create ,
    :triggers_drop,
    :triggers_create ,
    :rules_drop,
    :rules_create
  ]
  @script = {}
  @sections.each {|s| @script[s] = []}
end

Instance Method Details

#add_cnstr(tablename, cnstrname, cnstrdef) ⇒ Object 



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# File 'lib/diff.rb', line 309

def add_cnstr(tablename, cnstrname, cnstrdef)
  c_string = "ALTER TABLE #{tablename} ADD CONSTRAINT #{cnstrname} #{cnstrdef} ;"
  case cnstrdef
    when /^CHECK /   then @c_check  << c_string
    when /^PRIMARY / then @c_primary << c_string
    when /^FOREIGN / then @c_foreign << c_string
    when /^UNIQUE /  then @c_unique  << c_string
  end
end

#add_script(section, statement) ⇒ Object 



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# File 'lib/diff.rb', line 51

def add_script(section, statement)
  @script[section] << statement
end

#compare_domains ⇒ Object 



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# File 'lib/diff.rb', line 64

def compare_domains
  @old_database.domains.keys.each do |name|
    add_script(:domains_drop ,  "DROP DOMAIN #{name} CASCADE;") unless @new_database.domains.has_key?(name)
  end
  @new_database.domains.each do |name, df|
    add_script(:domains_create ,  "CREATE DOMAIN #{name} AS #{df};") unless @old_database.domains.has_key?(name)
    old_domain = @old_database.domains[name]
    if old_domain && old_domain != df
       add_script(:domains_drop, "DROP DOMAIN #{name} CASCADE;")
       add_script(:domains_create,  "-- [changed domain] :")
       add_script(:domains_create,  "-- OLD: #{old_domain}")
       add_script(:domains_create,  "CREATE DOMAIN #{name} AS #{df};")
    end
  end
end

#compare_functions ⇒ Object 



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# File 'lib/diff.rb', line 89

def compare_functions
  @old_database.functions.keys.each do |name|
    add_script(:functions_drop ,  "DROP FUNCTION #{name} CASCADE;") unless @new_database.functions.has_key?(name)
  end
  @new_database.functions.each do |name, func|
    add_script(:functions_create ,   func.definition) unless @old_database.functions.has_key?(name)
    old_function = @old_database.functions[name]
    if old_function && old_function.definition != func.definition
      add_script(:functions_create , '-- [changed function] :')
      add_script(:functions_create , '-- OLD :')
      add_script(:functions_create ,  old_function.definition.gsub(/^/, "-->  ") )
      add_script(:functions_create ,   func.definition)
    end
  end
end

#compare_rules_create ⇒ Object 



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# File 'lib/diff.rb', line 111

def compare_rules_create
  @new_database.rules.each do |name, rule|
    add_script(:rules_create ,   rule.definition) unless @old_database.rules.has_key?(name)
    old_rule = @old_database.rules[name]
    if old_rule && old_rule != rule
      add_script(:rules_drop ,  "DROP RULE #{rule.name} ON #{rule.table_name} CASCADE;")
      add_script(:rules_create ,  "-- [changed rule] :")
      add_script(:rules_create ,  "-- OLD: #{old_rule.definition}")
      add_script(:rules_create ,   rule.definition )
    end
  end
end

#compare_rules_drop ⇒ Object 



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# File 'lib/diff.rb', line 105

def compare_rules_drop
  @old_database.rules.each do |name, rule|
    add_script(:rules_drop ,  "DROP RULE #{rule.name} ON #{rule.table_name} CASCADE;") unless @new_database.rules.has_key?(name)
  end
end

#compare_schemas ⇒ Object 



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# File 'lib/diff.rb', line 55

def compare_schemas
  @old_database.schemas.keys.each do |name|
    add_script(:schemas_drop ,  "DROP SCHEMA #{name};") unless @new_database.schemas.has_key?(name)
  end
  @new_database.schemas.keys.each do |name|
    add_script(:schemas_create ,  "CREATE SCHEMA #{name};") unless @old_database.schemas.has_key?(name)
  end
end

#compare_sequences ⇒ Object 



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# File 'lib/diff.rb', line 80

def compare_sequences
  @old_database.sequences.keys.each do |name|
    add_script(:sequences_drop ,  "DROP SEQUENCE #{name} CASCADE;") unless @new_database.sequences.has_key?(name)
  end
  @new_database.sequences.keys.each do |name|
    add_script(:sequences_create ,  "CREATE SEQUENCE #{name};") unless @old_database.sequences.has_key?(name)
  end
end

#compare_table_attrs ⇒ Object 



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# File 'lib/diff.rb', line 162

def compare_table_attrs
  @old_database.tables.each do |name, table|
    add_script(:tables_drop, "DROP TABLE #{name} CASCADE;") unless @new_database.tables.has_key?(name)
  end
  @to_compare = []
  @new_database.tables.each do |name, table|
    unless @old_database.tables.has_key?(name)
      add_script(:tables_create ,  table.table_creation)
      add_script(:indices_create ,  table.index_creation) unless table.indexes.empty?
      @to_compare << name
    else
      diff_attributes(@old_database.tables[name], table)
      diff_indexes(@old_database.tables[name], table)
      @to_compare << name
    end
  end
end

#compare_table_constraints ⇒ Object 



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# File 'lib/diff.rb', line 180

def compare_table_constraints
  @c_check = []
  @c_primary = []
  @c_unique = []
  @c_foreign = []
  @to_compare.each do |name|
    if @old_database.tables[name]
      diff_constraints(@old_database.tables[name], @new_database.tables[name])
    else
      @new_database.tables[name].constraints.each do |cname, cdef|
        add_cnstr(name,  cname, cdef)
      end
    end
  end
  @script[:constraints_create] += @c_check
  @script[:constraints_create] += @c_primary
  @script[:constraints_create] += @c_unique
  @script[:constraints_create] += @c_foreign
end

#compare_triggers_create ⇒ Object 



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# File 'lib/diff.rb', line 130

def compare_triggers_create
  @new_database.triggers.each do |name, trigger|
    add_script(:triggers_create ,   trigger.definition) unless @old_database.triggers.has_key?(name)
    old_trigger = @old_database.triggers[name]
    if old_trigger && old_trigger != trigger
      add_script(:triggers_drop ,  "DROP trigger #{trigger.name} ON #{trigger.table_name} CASCADE;")
      add_script(:triggers_create ,  "-- [changed trigger] :")
      add_script(:triggers_create ,  "-- OLD #{old_trigger.definition}")
      add_script(:triggers_create ,   trigger.definition)
    end
  end
end

#compare_triggers_drop ⇒ Object 



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# File 'lib/diff.rb', line 124

def compare_triggers_drop
  @old_database.triggers.each do |name, trigger|
    add_script(:triggers_drop ,  "DROP trigger #{trigger.name} ON #{trigger.table_name} CASCADE;") unless @new_database.triggers.has_key?(name)
  end
end

#compare_views_create ⇒ Object 



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# File 'lib/diff.rb', line 149

def compare_views_create
  @new_database.views.each do |name, df|
    add_script(:views_create ,   df.definition) unless @old_database.views.has_key?(name)
    old_view = @old_database.views[name]
    if old_view && df.definition != old_view.definition
      add_script(:views_drop ,  "DROP VIEW #{name};")
      add_script(:views_create ,  "-- [changed view] :")
      add_script(:views_create ,  "-- #{old_view.definition.gsub(/\n/, ' ')}")
      add_script(:views_create ,  df.definition)
    end
  end
end

#compare_views_drop ⇒ Object 



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# File 'lib/diff.rb', line 143

def compare_views_drop
  @old_database.views.keys.each do |name|
    add_script(:views_drop ,  "DROP VIEW #{name};") unless @new_database.views.has_key?(name)
  end
end

#diff_attributes(old_table, new_table) ⇒ Object 



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# File 'lib/diff.rb', line 214

def diff_attributes(old_table, new_table)
  dropped = []
  added   = []
  changed = []

  order = []
  old_table.attributes.keys.each do |attname|
    if new_table.has_attribute?(attname)
      changed << attname if old_table.attributes[attname] != new_table.attributes[attname]
    else
      dropped << attname
    end
  end

  old_table.attributes.keys.each do |attname|
    if new_table.has_attribute?(attname)
      old_index = old_table.attribute_index(attname)
      new_index = new_table.attribute_index(attname)
      order << attname if old_index != new_index
    end
  end
  new_table.attributes.keys.each do |attname|
    added << attname unless old_table.has_attribute?(attname)
  end
  add_script(:tables_change ,  "--  [#{old_table.name}] dropped attributes") unless dropped.empty?
  dropped.each do |attname|
    add_script(:tables_change ,  "ALTER TABLE #{old_table.name} DROP COLUMN #{attname} CASCADE;")
  end
  add_script(:tables_change ,  "--  [#{old_table.name}] added attributes") unless added.empty?
  added.each do |attname|
    add_script(:tables_change ,  "ALTER TABLE #{old_table.name} ADD COLUMN #{new_table.attributes[attname].definition};")
  end
  add_script(:tables_change ,  "--  [#{old_table.name}] changed attributes") unless changed.empty?
  changed.each do |attname|
    old_att = old_table.attributes[attname]
    new_att = new_table.attributes[attname]
    add_script(:tables_change ,  "-- attribute: #{attname}")
    add_script(:tables_change ,  "-- OLD : #{old_att.definition}")
    add_script(:tables_change ,  "-- NEW : #{new_att.definition}")
    if old_att.type_def != new_att.type_def
      add_script(:tables_change ,  "ALTER TABLE #{old_table.name} ALTER COLUMN #{attname} TYPE #{new_att.type_def};")
    end
    if old_att.default != new_att.default
      if new_att.default.nil?
        add_script(:tables_change ,  "ALTER TABLE #{old_table.name} ALTER COLUMN #{attname} DROP DEFAULT;")
      else
        add_script(:tables_change ,  "ALTER TABLE #{old_table.name} ALTER COLUMN #{attname} SET DEFAULT #{new_att.default};")
      end
    end
    if old_att.notnull != new_att.notnull
      add_script(:tables_change ,  "ALTER TABLE #{old_table.name} ALTER COLUMN #{attname} #{new_att.notnull ? 'SET' : 'DROP'} NOT NULL;")
    end
  end

  add_script(:tables_change ,   "--  [#{old_table.name}] attribute order changed") unless order.empty?
  order.each do |attname|
    add_script(:tables_change , "     #{attname}.  Old index: #{old_table.attribute_index(attname)}, New index: #{new_table.attribute_index(attname)}")
  end
end

#diff_constraints(old_table, new_table) ⇒ Object 



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# File 'lib/diff.rb', line 274

def diff_constraints(old_table, new_table)
  dropped = []
  added   = []
  changed = []

  old_table.constraints.keys.each do |conname|
    if new_table.has_constraint?(conname)
      if old_table.constraints[conname] != new_table.constraints[conname]
        changed << conname
      end
    else
      dropped << conname
    end
  end

  new_table.constraints.keys.each do |conname|
    added << conname unless old_table.has_constraint?(conname)
  end

  dropped.each do |name|
    add_script(:constraints_drop ,  "ALTER TABLE #{old_table.name} DROP CONSTRAINT #{name};")
  end

  added.each do |name|
    add_cnstr(old_table.name,  name, new_table.constraints[name])
  end

  changed.each do |name|
    add_script(:constraints_change,
               "-- Previous: #{old_table.constraints[name]}\n" +
               "ALTER TABLE #{old_table.name} DROP CONSTRAINT #{name};\n" +
               "ALTER TABLE #{new_table.name} ADD CONSTRAINT #{name} #{new_table.constraints[name]};\n")
  end
end

#diff_indexes(old_table, new_table) ⇒ Object 



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# File 'lib/diff.rb', line 319

def diff_indexes(old_table, new_table)
  dropped = []
  added   = []

  old_table.indexes.keys.each do |name|
    if new_table.has_index?(name)
      if old_table.indexes[name] != new_table.indexes[name]
        dropped << name
        added << name
      end
    else
      dropped << name
    end
  end
  new_table.indexes.keys.each do |name|
    added << name unless old_table.has_index?(name)
  end

  dropped.each do |name|
    add_script(:indices_drop ,  "DROP INDEX #{name};")
  end
  added.each do |name|
    add_script(:indices_create ,  (new_table.indexes[name] + ";")) if new_table.indexes[name]
  end
end

#output ⇒ Object 



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# File 'lib/diff.rb', line 200

def output
  out = []
  @sections.each do |sect|
    if @script[sect].empty?
       out << "-- [SKIP SECTION : #{sect.to_s.upcase}] : no changes\n"
    else
       out << "-- [START SECTION : #{sect.to_s.upcase}]"
       out += @script[sect]
       out << "-- [END SECTION : #{sect.to_s.upcase}]\n"
    end
  end
  out.join("\n")
end

#run_compare ⇒ Object 



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# File 'lib/diff.rb', line 34

def run_compare
  @old_database = Database.new(@old_conn)
  @new_database = Database.new(@new_conn)
  compare_schemas
  compare_domains
  compare_sequences
  compare_triggers_drop
  compare_rules_drop
  compare_views_drop
  compare_table_attrs
  compare_views_create
  compare_functions
  compare_rules_create
  compare_triggers_create
  compare_table_constraints
end