Class: Dbviewer::Query::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/dbviewer/query/parser.rb

Overview

Parser handles parsing SQL queries and extracting useful information

Class Method Summary collapse

Class Method Details

.extract_tables(sql) ⇒ Object

Extract table names from an SQL query string



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# File 'lib/dbviewer/query/parser.rb', line 6

def self.extract_tables(sql)
  return [] if sql.nil?

  # Convert to lowercase for case-insensitive matching
  sql = sql.downcase

  # Extract table names after FROM or JOIN
  sql.scan(/(?:from|join)\s+[`"']?(\w+)[`"']?/).flatten.uniq
end

.format_binds(binds) ⇒ Object

Format bind parameters for storage



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# File 'lib/dbviewer/query/parser.rb', line 27

def self.format_binds(binds)
  return [] unless binds.respond_to?(:map)

  binds.map do |bind|
    if bind.respond_to?(:value)
      bind.value
    elsif bind.is_a?(Array) && bind.size == 2
      bind.last
    else
      bind.to_s
    end
  end
rescue
  []
end

.normalize(sql) ⇒ Object

Normalize a SQL query to find similar patterns Replaces specific values with placeholders



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# File 'lib/dbviewer/query/parser.rb', line 18

def self.normalize(sql)
  return "" if sql.nil?

  sql.gsub(/\b\d+\b/, "N")
     .gsub(/'[^']*'/, "'X'")
     .gsub(/"[^"]*"/, '"X"')
end

.should_skip_query?(event) ⇒ Boolean

Determine if a query should be skipped based on content Rails and ActiveRecord often run internal queries that are not useful for logging

Returns:

  • (Boolean) 


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# File 'lib/dbviewer/query/parser.rb', line 45

def self.should_skip_query?(event)
  event.payload[:name] == "SCHEMA" ||
  event.payload[:sql].include?("SHOW TABLES") ||
  event.payload[:sql].include?("sqlite_master") ||
  event.payload[:sql].include?("information_schema") ||
  event.payload[:sql].include?("schema_migrations") ||
  event.payload[:sql].include?("ar_internal_metadata") ||
  event.payload[:sql].include?("pg_catalog")
end