Module: Sqlbuilder::Statements::Builders::SelectBuilder

Included in:
DeleteBuilder, Select
Defined in:
lib/sqlbuilder/statements/builders/select_builder.rb

Instance Method Summary collapse

Instance Method Details

#build_columns ⇒ Object 



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# File 'lib/sqlbuilder/statements/builders/select_builder.rb', line 5

def build_columns
  if @columns.empty?
    "#{prefix}*"
  else
    @columns.map {|col| build_column(col) }.join(", ")
  end
end

#build_from ⇒ Object 



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# File 'lib/sqlbuilder/statements/builders/select_builder.rb', line 13

def build_from
  from = "FROM #{@table}"
  if @aliaz
    from << " #{@aliaz}"
  end

  from
end

#build_joins ⇒ Object 



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# File 'lib/sqlbuilder/statements/builders/select_builder.rb', line 22

def build_joins
  join_lines = @joins.map do |join|
    from = join[:from]
    type = join[:type]
    aliaz = join[:aliaz]

    table1_alias = if @aliaz then "#{@aliaz}" else "#{@table}" end
    table2_alias = if aliaz then "#{aliaz}" else "#{from}" end

    on = join[:on]
      .map do |col1, col2|
        [@utils.format_column(col1), @utils.format_column(col2)]
      end
      .map do |table1_col, table2_col|
        "#{table1_alias}.#{table1_col} = #{table2_alias}.#{table2_col}"
      end

    join_statement = "#{type} JOIN #{from}"

    if aliaz
      join_statement << " #{aliaz}"
    end

    unless on.empty?
      join_statement << " ON #{on.join(' AND ')}"
    end

    join_statement
  end

  join_lines.join(" ")
end

#build_limit ⇒ Object 



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# File 'lib/sqlbuilder/statements/builders/select_builder.rb', line 80

def build_limit
  "LIMIT #{@limit}"
end

#build_offset ⇒ Object 



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# File 'lib/sqlbuilder/statements/builders/select_builder.rb', line 84

def build_offset
  "OFFSET #{@offset}"
end

#build_order ⇒ Object 



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# File 'lib/sqlbuilder/statements/builders/select_builder.rb', line 72

def build_order
  order_by_clause = @order.map do |key, order|
    "#{prefix}#{@utils.format_column(key)} #{order}"
  end

  "ORDER BY #{order_by_clause.join(", ")}"
end

#build_where ⇒ Object 



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# File 'lib/sqlbuilder/statements/builders/select_builder.rb', line 55

def build_where
  where_clause = @where.map do |key, value|
    if value.is_a?(String) &&
       [">", "<", "!=", ">=", "<="].any? {|comp| value.include? comp }

      # TODO: raise custom exception if has more values after split
      symbol, extracted_value = value.split(" ")
      "#{prefix}#{@utils.format_column(key)} #{symbol} "\
      "#{format_value(extracted_value)}"
    else
      "#{prefix}#{@utils.format_column(key)} = #{format_value(value)}"
    end
  end

  "WHERE #{where_clause.join(" AND ")}"
end