Class: SqlQueryAnalyzer::SuggestionEngine

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

Instance Method Summary collapse

Constructor Details

#initialize(explain_output, sql = nil) ⇒ SuggestionEngine

Returns a new instance of SuggestionEngine.



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# File 'lib/sql_query_analyzer/suggestion_engine.rb', line 13

def initialize(explain_output, sql = nil)
  @explain_output = explain_output
  @sql = sql
end

Instance Method Details

#analyze ⇒ Object 



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# File 'lib/sql_query_analyzer/suggestion_engine.rb', line 18

def analyze
  suggestions = []

  # Rule 1: Sequential Scan
  if @explain_output.match?(/Seq Scan/i)
    suggestions << Suggestion.new(:critical, "⚡ Sequential Scan detected. Consider adding indexes to avoid full table scans.")
  end

  # Rule 2: SELECT *
  if @sql&.match?(/select\s+\*/i)
    suggestions << Suggestion.new(:warning, "🚨 Query uses SELECT *. Selecting only needed columns is more efficient.")
  end

  # Rule 3: Sort operation
  if @explain_output.match?(/Sort/i)
    suggestions << Suggestion.new(:info, "📈 Sort detected. Consider adding an index to support ORDER BY.")
  end

  # Rule 4: Missing JOIN conditions
  if @sql&.match?(/join/i) && !@sql.match?(/on/i)
    suggestions << Suggestion.new(:critical, "⚡ JOIN without ON detected. May cause massive row combinations (CROSS JOIN).")
  end

  # Rule 5: High Rows estimation
  if @explain_output.match?(/rows=(\d+)/)
    rows = @explain_output.match(/rows=(\d+)/)[1].to_i
    if rows > 100_000
      suggestions << Suggestion.new(:critical, "🔥 High number of rows (#{rows}). Consider using WHERE conditions or LIMIT.")
    end
  end

  suggestions
end