Class Sequel::MySQL::Dataset
In: lib/sequel/adapters/mysql.rb
Parent: Sequel::Dataset

Dataset class for MySQL datasets accessed via the native driver.

Methods

Included Modules

Sequel::MySQL::DatasetMethods StoredProcedures

Classes and Modules

Module Sequel::MySQL::Dataset::CallableStatementMethods
Module Sequel::MySQL::Dataset::PreparedStatementMethods
Module Sequel::MySQL::Dataset::StoredProcedureMethods

Public Instance methods

MySQL is different in that it supports prepared statements but not bound variables outside of prepared statements. The default implementation breaks the use of subselects in prepared statements, so extend the temporary prepared statement that this creates with a module that fixes it.

[Source]

     # File lib/sequel/adapters/mysql.rb, line 314
314:       def call(type, bind_arguments={}, *values, &block)
315:         ps = to_prepared_statement(type, values)
316:         ps.extend(CallableStatementMethods)
317:         ps.call(bind_arguments, &block)
318:       end

Delete rows matching this dataset

[Source]

     # File lib/sequel/adapters/mysql.rb, line 321
321:       def delete
322:         execute_dui(delete_sql){|c| return c.affected_rows}
323:       end

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.

[Source]

     # File lib/sequel/adapters/mysql.rb, line 328
328:       def fetch_rows(sql, &block)
329:         execute(sql) do |r|
330:           i = -1
331:           cols = r.fetch_fields.map do |f| 
332:             # Pretend tinyint is another integer type if its length is not 1, to
333:             # avoid casting to boolean if Sequel::MySQL.convert_tinyint_to_bool
334:             # is set.
335:             type_proc = f.type == 1 && f.length != 1 ? MYSQL_TYPES[2] : MYSQL_TYPES[f.type]
336:             [output_identifier(f.name), type_proc, i+=1]
337:           end
338:           @columns = cols.map{|c| c.first}
339:           if opts[:split_multiple_result_sets]
340:             s = []
341:             yield_rows(r, cols){|h| s << h}
342:             yield s
343:           else
344:             yield_rows(r, cols, &block)
345:           end
346:         end
347:         self
348:       end

Don‘t allow graphing a dataset that splits multiple statements

[Source]

     # File lib/sequel/adapters/mysql.rb, line 351
351:       def graph(*)
352:         raise(Error, "Can't graph a dataset that splits multiple result sets") if opts[:split_multiple_result_sets]
353:         super
354:       end

Insert a new value into this dataset

[Source]

     # File lib/sequel/adapters/mysql.rb, line 357
357:       def insert(*values)
358:         execute_dui(insert_sql(*values)){|c| return c.insert_id}
359:       end

Store the given type of prepared statement in the associated database with the given name.

[Source]

     # File lib/sequel/adapters/mysql.rb, line 363
363:       def prepare(type, name=nil, *values)
364:         ps = to_prepared_statement(type, values)
365:         ps.extend(PreparedStatementMethods)
366:         if name
367:           ps.prepared_statement_name = name
368:           db.prepared_statements[name] = ps
369:         end
370:         ps
371:       end

Replace (update or insert) the matching row.

[Source]

     # File lib/sequel/adapters/mysql.rb, line 374
374:       def replace(*args)
375:         execute_dui(replace_sql(*args)){|c| return c.insert_id}
376:       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.

[Source]

     # File lib/sequel/adapters/mysql.rb, line 387
387:       def split_multiple_result_sets
388:         raise(Error, "Can't split multiple statements on a graphed dataset") if opts[:graph]
389:         ds = clone(:split_multiple_result_sets=>true)
390:         ds.row_proc = proc{|x| x.map{|h| row_proc.call(h)}} if row_proc
391:         ds
392:       end

Update the matching rows.

[Source]

     # File lib/sequel/adapters/mysql.rb, line 395
395:       def update(values={})
396:         execute_dui(update_sql(values)){|c| return c.affected_rows}
397:       end

[Validate]