| Class | Sequel::SQLite::Dataset |
| In: |
lib/sequel/adapters/sqlite.rb
|
| Parent: | Sequel::Dataset |
| EXPLAIN | = | 'EXPLAIN %s'.freeze |
| PREPARED_ARG_PLACEHOLDER | = | ':'.freeze |
Return an array of strings specifying a query explanation for the current dataset.
# File lib/sequel/adapters/sqlite.rb, line 198
198: def explain
199: res = []
200: @db.result_set(EXPLAIN % select_sql(opts), nil) {|r| res << r}
201: res
202: end
Yield a hash for each row in the dataset.
# File lib/sequel/adapters/sqlite.rb, line 205
205: def fetch_rows(sql)
206: execute(sql) do |result|
207: @columns = result.columns.map{|c| output_identifier(c)}
208: column_count = @columns.size
209: result.each do |values|
210: row = {}
211: column_count.times {|i| row[@columns[i]] = values[i]}
212: yield row
213: end
214: end
215: end
Prepare the given type of query with the given name and store it in the database. Note that a new native prepared statement is created on each call to this prepared statement.
# File lib/sequel/adapters/sqlite.rb, line 220
220: def prepare(type, name=nil, values=nil)
221: ps = to_prepared_statement(type, values)
222: ps.extend(PreparedStatementMethods)
223: db.prepared_statements[name] = ps if name
224: ps
225: end