class Sequel::MySQL::Dataset
Public Instance Methods
Yield all rows matching this dataset. If the dataset is set to split multiple statements, yield arrays of hashes one per statement instead of yielding results for all statements as hashes.
# File lib/sequel/adapters/mysql.rb 280 def fetch_rows(sql) 281 execute(sql) do |r| 282 i = -1 283 cps = db.conversion_procs 284 cols = r.fetch_fields.map do |f| 285 # Pretend tinyint is another integer type if its length is not 1, to 286 # avoid casting to boolean if convert_tinyint_to_bool is set. 287 type_proc = f.type == 1 && cast_tinyint_integer?(f) ? cps[2] : cps[f.type] 288 [output_identifier(f.name), type_proc, i+=1] 289 end 290 self.columns = cols.map(&:first) 291 if opts[:split_multiple_result_sets] 292 s = [] 293 yield_rows(r, cols){|h| s << h} 294 yield s 295 else 296 yield_rows(r, cols){|h| yield h} 297 end 298 end 299 self 300 end
Don't allow graphing a dataset that splits multiple statements
Sequel::Dataset#graph
# File lib/sequel/adapters/mysql.rb 303 def graph(*) 304 raise(Error, "Can't graph a dataset that splits multiple result sets") if opts[:split_multiple_result_sets] 305 super 306 end
Makes each yield arrays of rows, with each array containing the rows for a given result set. Does not work with graphing. So you can submit SQL
with multiple statements and easily determine which statement returned which results.
Modifies the row_proc of the returned dataset so that it still works as expected (running on the hashes instead of on the arrays of hashes). If you modify the row_proc afterward, note that it will receive an array of hashes instead of a hash.
# File lib/sequel/adapters/mysql.rb 317 def split_multiple_result_sets 318 raise(Error, "Can't split multiple statements on a graphed dataset") if opts[:graph] 319 ds = clone(:split_multiple_result_sets=>true) 320 ds = ds.with_row_proc(proc{|x| x.map{|h| row_proc.call(h)}}) if row_proc 321 ds 322 end
Private Instance Methods
Whether a tinyint field should be casted as an integer. By default, casts to integer if the field length is not 1. Can be overwritten to make tinyint casting dataset dependent.
# File lib/sequel/adapters/mysql.rb 329 def cast_tinyint_integer?(field) 330 field.length != 1 331 end
Sequel::Dataset#execute
# File lib/sequel/adapters/mysql.rb 333 def execute(sql, opts=OPTS) 334 opts = Hash[opts] 335 opts[:type] = :select 336 super 337 end
Handle correct quoting of strings using ::MySQL.quote.
# File lib/sequel/adapters/mysql.rb 340 def literal_string_append(sql, v) 341 sql << "'" << ::Mysql.quote(v) << "'" 342 end
Yield each row of the given result set r with columns cols as a hash with symbol keys
# File lib/sequel/adapters/mysql.rb 346 def yield_rows(r, cols) 347 while row = r.fetch_row 348 h = {} 349 cols.each{|n, p, i| v = row[i]; h[n] = (v && p) ? p.call(v) : v} 350 yield h 351 end 352 end