Class: DbHelper

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

Class Method Summary collapse

Class Method Details

.find(needle, anchor_left: false, anchor_right: false, excluded_tables: []) ⇒ Object 



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# File 'lib/db_helper.rb', line 100

def self.find(needle, anchor_left: false, anchor_right: false, excluded_tables: [])
  found = {}
  like = "#{anchor_left ? "" : "%"}#{needle}#{anchor_right ? "" : "%"}"

  DB
    .query(REMAP_SQL)
    .each do |r|
      next if excluded_tables.include?(r.table_name)

      rows = DB.query(<<~SQL, like: like)
      SELECT \"#{r.column_name}\"
        FROM \"#{r.table_name}\"
       WHERE \"#{r.column_name}\" LIKE :like
    SQL

      if rows.size > 0
        found["#{r.table_name}.#{r.column_name}"] = rows.map do |row|
          row.public_send(r.column_name)
        end
      end
    end

  found
end

.regexp_replace(pattern, replacement, flags: "gi", match: "~*", excluded_tables: [], verbose: false) ⇒ Object 



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# File 'lib/db_helper.rb', line 61

def self.regexp_replace(
  pattern,
  replacement,
  flags: "gi",
  match: "~*",
  excluded_tables: [],
  verbose: false
)
  text_columns = find_text_columns(excluded_tables)

  text_columns.each do |table, columns|
    set =
      columns
        .map do |column|
          replace = "REGEXP_REPLACE(\"#{column[:name]}\", :pattern, :replacement, :flags)"
          replace = truncate(replace, table, column)
          "\"#{column[:name]}\" = #{replace}"
        end
        .join(", ")

    where =
      columns
        .map do |column|
          "\"#{column[:name]}\" IS NOT NULL AND \"#{column[:name]}\" #{match} :pattern"
        end
        .join(" OR ")

    rows = DB.exec(<<~SQL, pattern: pattern, replacement: replacement, flags: flags, match: match)
      UPDATE \"#{table}\"
         SET #{set}
       WHERE #{where}
    SQL

    puts "#{table}=#{rows}" if verbose && rows > 0
  end

  finish!
end

.remap(from, to, anchor_left: false, anchor_right: false, excluded_tables: [], verbose: false) ⇒ Object 



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

def self.remap(
  from,
  to,
  anchor_left: false,
  anchor_right: false,
  excluded_tables: [],
  verbose: false
)
  like = "#{anchor_left ? "" : "%"}#{from}#{anchor_right ? "" : "%"}"
  text_columns = find_text_columns(excluded_tables)

  text_columns.each do |table, columns|
    set =
      columns
        .map do |column|
          replace = "REPLACE(\"#{column[:name]}\", :from, :to)"
          replace = truncate(replace, table, column)
          "\"#{column[:name]}\" = #{replace}"
        end
        .join(", ")

    where =
      columns
        .map { |column| "\"#{column[:name]}\" IS NOT NULL AND \"#{column[:name]}\" LIKE :like" }
        .join(" OR ")

    rows = DB.exec(<<~SQL, from: from, to: to, like: like)
      UPDATE \"#{table}\"
         SET #{set}
       WHERE #{where}
    SQL

    puts "#{table}=#{rows}" if verbose && rows > 0
  end

  finish!
end