Module | Sequel::MySQL::DatabaseMethods |
In: |
lib/sequel/adapters/shared/mysql.rb
|
AUTO_INCREMENT | = | 'AUTO_INCREMENT'.freeze |
CAST_TYPES | = | {String=>:CHAR, Integer=>:SIGNED, Time=>:DATETIME, DateTime=>:DATETIME, Numeric=>:DECIMAL, BigDecimal=>:DECIMAL, File=>:BINARY} |
COLUMN_DEFINITION_ORDER | = | [:collate, :null, :default, :unique, :primary_key, :auto_increment, :references] |
PRIMARY | = | 'PRIMARY'.freeze |
Commit an existing prepared transaction with the given transaction identifier string.
# File lib/sequel/adapters/shared/mysql.rb, line 45 45: def commit_prepared_transaction(transaction_id) 46: run("XA COMMIT #{literal(transaction_id)}") 47: end
Use the Information Schema‘s KEY_COLUMN_USAGE table to get basic information on foreign key columns, but include the constraint name.
# File lib/sequel/adapters/shared/mysql.rb, line 57 57: def foreign_key_list(table, opts={}) 58: m = output_identifier_meth 59: im = input_identifier_meth 60: ds = metadata_dataset. 61: from(:INFORMATION_SCHEMA__KEY_COLUMN_USAGE). 62: where(:TABLE_NAME=>im.call(table)). 63: exclude(:CONSTRAINT_NAME=>'PRIMARY'). 64: exclude(:REFERENCED_TABLE_NAME=>nil). 65: select(:CONSTRAINT_NAME___name, :COLUMN_NAME___column, :REFERENCED_TABLE_NAME___table, :REFERENCED_COLUMN_NAME___key) 66: 67: h = {} 68: ds.each do |row| 69: if r = h[row[:name]] 70: r[:columns] << m.call(row[:column]) 71: r[:key] << m.call(row[:key]) 72: else 73: h[row[:name]] = {:name=>m.call(row[:name]), :columns=>[m.call(row[:column])], :table=>m.call(row[:table]), :key=>[m.call(row[:key])]} 74: end 75: end 76: h.values 77: end
Use SHOW INDEX FROM to get the index information for the table.
By default partial indexes are not included, you can use the option :partial to override this.
# File lib/sequel/adapters/shared/mysql.rb, line 89 89: def indexes(table, opts={}) 90: indexes = {} 91: remove_indexes = [] 92: m = output_identifier_meth 93: im = input_identifier_meth 94: metadata_dataset.with_sql("SHOW INDEX FROM ?", SQL::Identifier.new(im.call(table))).each do |r| 95: name = r[:Key_name] 96: next if name == PRIMARY 97: name = m.call(name) 98: remove_indexes << name if r[:Sub_part] && ! opts[:partial] 99: i = indexes[name] ||= {:columns=>[], :unique=>r[:Non_unique] != 1} 100: i[:columns] << m.call(r[:Column_name]) 101: end 102: indexes.reject{|k,v| remove_indexes.include?(k)} 103: end
Get version of MySQL server, used for determined capabilities.
# File lib/sequel/adapters/shared/mysql.rb, line 112 112: def server_version 113: m = /(\d+)\.(\d+)\.(\d+)/.match(get(SQL::Function.new(:version))) 114: @server_version ||= (m[1].to_i * 10000) + (m[2].to_i * 100) + m[3].to_i 115: end
MySQL doesn‘t support savepoints inside prepared transactions in from 5.5.12 to 5.5.23, see bugs.mysql.com/bug.php?id=64374
# File lib/sequel/adapters/shared/mysql.rb, line 134 134: def supports_savepoints_in_prepared_transactions? 135: super && (server_version <= 50512 || server_version >= 50523) 136: end