Class: SQLite::Query

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(db) ⇒ Query

Returns a new instance of Query.



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

def initialize(db)
  @db = db
end

Instance Attribute Details

#db ⇒ Object (readonly)

Returns the value of attribute db.



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# File 'lib/sqlite.rb', line 17

def db
  @db
end

Instance Method Details

#exec(sql) ⇒ Object 



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

def exec(sql)
  stmt = @db.prepare(sql)
  
  return nil if stmt == nil

  recordset = Recordset.new()
  recordset.rows = 0

  # Iterate over result set
  while true
    row     = []
    ordinal = 0

    stmt.each do |name, value|        
      if recordset.rows == 0
        recordset.columns << name
        recordset.headers[name] = ordinal
        recordset.header_names[ordinal] = name
        recordset.header_indexes[name]  = ordinal
        recordset.types << stmt.columnType(ordinal)
        ordinal += 1
      else
        row << value
      end
    end

    recordset.data << row if recordset.rows > 0

    recordset.rows += 1

    if stmt.step() != SQLITE_ROW
      break
    end
  end

  # Subtract 1 for header
  recordset.rows -= 1

  return recordset
end