discourse/lib/db_helper.rb

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class DbHelper
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REMAP_SQL ||= <<~SQL
SELECT table_name, column_name
FROM information_schema.columns
WHERE table_schema = 'public'
AND is_updatable = 'YES'
AND (data_type LIKE 'char%' OR data_type LIKE 'text%')
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ORDER BY table_name, column_name
SQL
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def self.remap(from, to, anchor_left: false, anchor_right: false, excluded_tables: [])
like = "#{anchor_left ? '' : "%"}#{from}#{anchor_right ? '' : "%"}"
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text_columns = Hash.new { |h, k| h[k] = [] }
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DB.query(REMAP_SQL).each do |r|
text_columns[r.table_name] << r.column_name
end
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text_columns.each do |table, columns|
next if excluded_tables.include?(table)
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set = columns.map do |column|
"#{column} = REPLACE(#{column}, :from, :to)"
end.join(", ")
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where = columns.map do |column|
"#{column} IS NOT NULL AND #{column} LIKE :like"
end.join(" OR ")
DB.exec(<<~SQL, from: from, to: to, like: like)
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UPDATE #{table}
SET #{set}
WHERE #{where}
SQL
end
SiteSetting.refresh!
end
def self.regexp_replace(pattern, replacement, flags: "gi", match: "~*", excluded_tables: [])
text_columns = Hash.new { |h, k| h[k] = [] }
DB.query(REMAP_SQL).each do |r|
text_columns[r.table_name] << r.column_name
end
text_columns.each do |table, columns|
next if excluded_tables.include?(table)
set = columns.map do |column|
"#{column} = REGEXP_REPLACE(#{column}, :pattern, :replacement, :flags)"
end.join(", ")
where = columns.map do |column|
"#{column} IS NOT NULL AND #{column} #{match} :pattern"
end.join(" OR ")
puts pattern, replacement, flags, match
DB.exec(<<~SQL, pattern: pattern, replacement: replacement, flags: flags, match: match)
UPDATE #{table}
SET #{set}
WHERE #{where}
SQL
end
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SiteSetting.refresh!
end
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def self.find(needle, anchor_left: false, anchor_right: false, excluded_tables: [])
found = {}
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like = "#{anchor_left ? '' : "%"}#{needle}#{anchor_right ? '' : "%"}"
DB.query(REMAP_SQL).each do |r|
next if excluded_tables.include?(r.table_name)
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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 { |row| row.send(r.column_name) }
end
end
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found
end
end