Class: PgDiff::Table

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(conn, schema, table_name) ⇒ Table

Returns a new instance of Table.



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# File 'lib/table.rb', line 5

def initialize(conn, schema, table_name)
  @schema = schema
  @table_name = table_name
  @attributes = {}
  @constraints = {}
  @indexes = {}
  @atlist = []

  att_query = "    select attname, format_type(atttypid, atttypmod) as a_type, attnotnull,  pg_get_expr(adbin, attrelid) as a_default\n    from pg_attribute left join pg_attrdef  on (adrelid = attrelid and adnum = attnum)\n    where attrelid = '\#{schema}.\#{table_name}'::regclass and not attisdropped and attnum > 0\n    order by attnum\n  EOT\n  conn.query(att_query).each do |tuple|\n    attname = tuple['attname']\n    typedef = tuple['a_type']\n    notnull = tuple['attnotnull']\n    default = tuple['a_default']\n    @attributes[attname] = Attribute.new(attname, typedef, notnull, default)\n    @atlist << attname\n  end\n\n  ind_query = <<-EOT\n    select indexrelid::regclass as indname, pg_get_indexdef(indexrelid) as def\n    from pg_index where indrelid = '\#{schema}.\#{table_name}'::regclass and not indisprimary\n  EOT\n  conn.query(ind_query).each do |tuple|\n    name = tuple['indname']\n    value = tuple['def']\n    @indexes[name] = value\n  end\n\n  cons_query = <<-EOT\n    select conname, pg_get_constraintdef(oid) from pg_constraint where conrelid = '\#{schema}.\#{table_name}'::regclass\n  EOT\n  conn.query(cons_query).each do |tuple|\n    name = tuple['conname']\n    value = tuple['pg_get_constraintdef']\n    @constraints[name] = value\n  end\n  @constraints.keys.each do |cname|\n    @indexes.delete(\"\#{schema}.\#{cname}\") if has_index?(cname)\n  end\nend\n"

Instance Attribute Details

#attributes ⇒ Object

Returns the value of attribute attributes.



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

def attributes
  @attributes
end

#constraints ⇒ Object

Returns the value of attribute constraints.



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

def constraints
  @constraints
end

#indexes ⇒ Object

Returns the value of attribute indexes.



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

def indexes
  @indexes
end

#schema ⇒ Object

Returns the value of attribute schema.



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

def schema
  @schema
end

#table_name ⇒ Object

Returns the value of attribute table_name.



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

def table_name
  @table_name
end

Instance Method Details

#attribute_index(name) ⇒ Object 



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

def attribute_index(name)
  @atlist.index(name)
end

#has_attribute?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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

def has_attribute?(name)
  @attributes.has_key?(name)
end

#has_constraint?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/table.rb', line 63

def has_constraint?(name)
  @constraints.has_key?(name)
end

#has_index?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/table.rb', line 59

def has_index?(name)
  @indexes.has_key?(name) || @indexes.has_key?("#{schema}.#{name}")
end

#index_creation ⇒ Object 



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# File 'lib/table.rb', line 82

def index_creation
  out = []
  @indexes.values.each do |c|
    out << (c+";")
  end
  out.join("\n")
end

#name ⇒ Object 



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# File 'lib/table.rb', line 78

def name
  "#{schema}.#{table_name}"
end

#table_creation ⇒ Object 



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# File 'lib/table.rb', line 67

def table_creation
  out = ["CREATE TABLE #{name} ("]
  stmt = []
  @atlist.each do |attname|
    stmt << @attributes[attname].definition
  end
  out << stmt.join(",\n")
  out << ");"
  out.join("\n")
end