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# web/lib/sql.rb
#
# SQL database wrapper with convenience methods for query building.
module SQL
# Wrapper for a database connection.
class Database
# This has to be called once to initialize the context for the database
def self.init(dir)
@@dir = dir
db = SQL::Database.new
db.select('SELECT * FROM sources ORDER BY no').execute().each do |source|
Source.new(source['id'], source['name'], source['data_until'], source['update_start'], source['update_end'], source['visible'].to_i == 1)
end
data_until = db.select("SELECT min(data_until) FROM sources WHERE id='db'").get_first_value().sub(/:..$/, '')
db.close
data_until
end
def initialize
filename = @@dir + '/taginfo-master.db'
@db = SQLite3::Database.new(filename)
@db.results_as_hash = true
@db.execute('SELECT * FROM languages') do |row|
Language.new(row)
end
end
def attach_sources
Source.each do |source|
@db.execute("ATTACH DATABASE ? AS ?", "#{ @@dir }/#{ source.dbname }", source.id.to_s)
end
@db.execute("ATTACH DATABASE ? AS search", "#{ @@dir }/taginfo-search.db")
@db.execute("ATTACH DATABASE ? AS history", "#{ @@dir }/taginfo-history.db")
self
end
def close
@db.close
@db = nil
end
def wrap_query(query, *params)
t1 = Time.now
out = yield
duration = Time.now - t1
min_duration = TaginfoConfig.get('logging.min_duration', 0)
if duration > min_duration
if params.size > 0
p = ' params=[' + params.map{ |p| "'#{p}'" }.join(', ') + ']'
else
p = ''
end
($queries_log||$stdout).puts %Q{SQL duration=#{ duration } query="#{ query };"} + p
end
out
end
def execute(*args, &block)
wrap_query(*args) do
@db.execute(*args, &block)
end
end
def get_first_row(*args)
wrap_query(*args) do
@db.get_first_row(*args)
end
end
def get_first_value(*args)
wrap_query(*args) do
@db.get_first_value(*args)
end
end
def select(query, *params)
Select.new(self, query, *params)
end
# Build query of the form
# SELECT count(*) FROM table;
def count(table)
Select.new(self, 'SELECT count(*) FROM ' + table)
end
def stats(key)
get_first_value('SELECT value FROM master_stats WHERE key=?', key).to_i
end
end
# Representation of a SELECT query.
class Select
def initialize(db, query, *params)
@db = db
@query = [query]
@conditions = []
@params = params
end
def condition(expression, *params)
@conditions << expression
@params.push(*params)
self
end
def is_null(attribute)
condition("#{attribute} IS NULL")
self
end
def condition_if(expression, *param)
unless param.first.to_s.match(/^%?%?$/)
condition(expression, *param)
end
self
end
def conditions(cond)
cond.each do |cond|
condition(cond)
end
self
end
def order_by(values, direction, &block)
if values.is_a?(Array)
values = values.compact
else
values = [values]
end
o = Order.new(values, &block)
if direction != 'ASC' && direction != 'DESC'
raise ArgumentError, 'direction must be ASC or DESC'
end
values.each do |value|
value = o.default if value.nil?
unless o._allowed(value)
raise ArgumentError, 'order by this attribute not allowed'
end
end
unless values.empty?
@order_by = "ORDER BY " + values.map{ |value|
value = o.default if value.nil?
o[value.to_s].map{ |oel| oel.to_s(direction) }.join(',')
}.join(',')
end
self
end
def group_by(value)
@group_by = "GROUP BY #{value}"
self
end
def paging(ap)
if ap.do_paging?
limit(ap.results_per_page, ap.first_result)
end
self
end
def limit(limit, offset=0)
@limit = "LIMIT #{limit} OFFSET #{offset}"
self
end
def build_query
unless @conditions.empty?
@query << 'WHERE'
@query << @conditions.map{ |c| "(#{c})" }.join(' AND ')
end
@query << @group_by
@query << @order_by
@query << @limit
@query.compact.join(' ')
end
def execute(&block)
q = build_query()
@db.execute(q, *@params, &block)
end
def get_first_value
q = build_query()
@db.get_first_value(q, *@params)
end
def get_first_i
get_first_value().to_i
end
def get_columns(*columns)
q = build_query()
row = @db.get_first_row(q, *@params)
return [nil] * columns.size if row.nil?;
columns.map{ |column| row[column.to_s] }
end
end
class OrderElement
@@DIRECTION = { 'ASC' => 'DESC', 'DESC' => 'ASC' }
def initialize(column, reverse)
@column = column
@reverse = reverse
end
def to_s(direction)
dir = @reverse ? @@DIRECTION[direction.upcase] : direction.upcase
"#{@column} #{dir}"
end
end
class Order
attr_reader :default
def initialize(values, &block)
@allowed = Hash.new
if block_given?
yield self
else
values.each do |value|
_add(value.to_s)
end
end
end
def _allowed(field)
@allowed.has_key?(field.to_s)
end
def [](field)
@allowed[field]
end
def _add(field, attribute=nil)
field = field.to_s
@default = field unless defined? @default
if field =~ /^(.*)!$/
field = $1
reverse = true
else
reverse = false
end
attribute = field if attribute.nil?
@allowed[field] ||= Array.new
@allowed[field] << OrderElement.new(attribute.to_s, reverse)
end
def method_missing(field, attribute=nil)
_add(field, attribute)
end
end
end
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