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Sequel::MySQL::DatabaseMethods

Methods shared by Database instances that connect to MySQL, currently supported by the native and JDBC adapters.

Public Instance Methods

cast_type_literal(type) click to toggle source

MySQL’s cast rules are restrictive in that you can’t just cast to any possible database type.

# File lib/sequel/adapters/shared/mysql.rb, line 29
def cast_type_literal(type)
  CAST_TYPES[type] || super
end
database_type() click to toggle source

MySQL uses the :mysql database type

# File lib/sequel/adapters/shared/mysql.rb, line 34
def database_type
  :mysql
end
indexes(table, opts={}) click to toggle source

Use SHOW INDEX FROM to get the index information for the table.

# File lib/sequel/adapters/shared/mysql.rb, line 39
def indexes(table, opts={})
  indexes = {}
  remove_indexes = []
  m = output_identifier_meth
  im = input_identifier_meth
  metadata_dataset.with_sql("SHOW INDEX FROM ?", SQL::Identifier.new(im.call(table))).each do |r|
    name = r[:Key_name]
    next if name == PRIMARY
    name = m.call(name)
    remove_indexes << name if r[:Sub_part]
    i = indexes[name] ||= {:columns=>[], :unique=>r[:Non_unique] != 1}
    i[:columns] << m.call(r[:Column_name])
  end
  indexes.reject{|k,v| remove_indexes.include?(k)}
end
server_version() click to toggle source

Get version of MySQL server, used for determined capabilities.

# File lib/sequel/adapters/shared/mysql.rb, line 56
def server_version
  m = /(\d+)\.(\d+)\.(\d+)/.match(get(SQL::Function.new(:version)))
  @server_version ||= (m[1].to_i * 10000) + (m[2].to_i * 100) + m[3].to_i
end
supports_savepoints?() click to toggle source

MySQL supports savepoints

# File lib/sequel/adapters/shared/mysql.rb, line 71
def supports_savepoints?
  true
end
tables(opts={}) click to toggle source

Return an array of symbols specifying table names in the current database.

Options:

  • :server - Set the server to use

# File lib/sequel/adapters/shared/mysql.rb, line 65
def tables(opts={})
  m = output_identifier_meth
  metadata_dataset.with_sql('SHOW TABLES').server(opts[:server]).map{|r| m.call(r.values.first)}
end
use(db_name) click to toggle source

Changes the database in use by issuing a USE statement. I would be very careful if I used this.

# File lib/sequel/adapters/shared/mysql.rb, line 77
def use(db_name)
  disconnect
  @opts[:database] = db_name if self << "USE #{db_name}"
  @schemas = {}
  self
end

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