Class: Mysql

Inherits:
Object
  • Object
show all
Defined in:
lib/mysql.rb,
lib/mysql/charset.rb

Overview

MySQL connection class.

Examples:

my = Mysql.connect('hostname', 'user', 'password', 'dbname')
res = my.query 'select col1,col2 from tbl where id=123'
res.each do |c1, c2|
  p c1, c2
end

Defined Under Namespace

Classes: Charset, Field, Result, ResultBase, Stmt

Constant Summary collapse

VERSION =

Version number of this library

'3.0.1'
MYSQL_UNIX_PORT =

UNIX domain socket filename

"/tmp/mysql.sock"
MYSQL_TCP_PORT =

TCP socket port number

3306
DEFAULT_OPTS = 
{
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(uri, **opts) ⇒ Mysql #initialize(host, username, password, database, port, socket, flags, **opts) ⇒ Mysql #initialize(host: nil, username: nil, password: nil, database: nil, port: nil, socket: nil, flags: nil, **opts) ⇒ Mysql

Returns a new instance of Mysql.

Overloads:

  • #initialize(uri, **opts) ⇒ Mysql

    Parameters:

    • uri (String, URI) —

      "mysql://username:[email protected]:port/database?param=value&..." / "mysql://username:password@%2Ftmp%2Fmysql.sock/database" / "mysql://username:password@/database?socket=/tmp/mysql.sock"

    • opts (Hash) —

      options

  • #initialize(host, username, password, database, port, socket, flags, **opts) ⇒ Mysql

    Parameters:

    • host (String) —

      hostname mysqld running

    • username (String) —

      username to connect to mysqld

    • password (String) —

      password to connect to mysqld

    • database (String) —

      initial database name

    • port (String) —

      port number (used if host is not 'localhost' or nil)

    • socket (String) —

      socket filename (used if host is 'localhost' or nil)

    • flags (Integer) —

      connection flag. Mysql::CLIENT_* ORed

    • opts (Hash) —

      options

  • #initialize(host: nil, username: nil, password: nil, database: nil, port: nil, socket: nil, flags: nil, **opts) ⇒ Mysql

    Parameters:

    • host (String) (defaults to: nil) —

      hostname mysqld running

    • username (String) (defaults to: nil) —

      username to connect to mysqld

    • password (String) (defaults to: nil) —

      password to connect to mysqld

    • database (String) (defaults to: nil) —

      initial database name

    • port (String) (defaults to: nil) —

      port number (used if host is not 'localhost' or nil)

    • socket (String) (defaults to: nil) —

      socket filename (used if host is 'localhost' or nil)

    • flags (Integer) (defaults to: nil) —

      connection flag. Mysql::CLIENT_* ORed

    • opts (Hash) —

      options

    Options Hash (**opts):

    • :host (String) —

      hostname mysqld running

    • :username (String) —

      username to connect to mysqld

    • :password (String) —

      password to connect to mysqld

    • :database (String) —

      initial database name

    • :port (String) —

      port number (used if host is not 'localhost' or nil)

    • :socket (String) —

      socket filename (used if host is 'localhost' or nil)

    • :flags (Integer) —

      connection flag. Mysql::CLIENT_* ORed

    • :charset (Mysql::Charset, String) —

      character set

    • :connect_timeout (Numeric, nil)
    • :read_timeout (Numeric, nil)
    • :write_timeout (Numeric, nil)
    • :local_infile (Boolean)
    • :load_data_local_dir (String)
    • :ssl_mode (Integer)
    • :get_server_public_key (Boolean) 


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# File 'lib/mysql.rb', line 139

def initialize(*args, **opts)
  @fields = nil
  @protocol = nil
  @sqlstate = "00000"
  @host_info = nil
  @last_error = nil
  @result_exist = false
  @opts = DEFAULT_OPTS.dup
  parse_args(args, opts)
end

Instance Attribute Details

#connect_timeout ⇒ Numeric?

Returns:

  • (Numeric, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#database ⇒ String?

Returns:

  • (String, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#flags ⇒ Integer?

Returns:

  • (Integer, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#get_server_public_key ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#host ⇒ String?

Returns:

  • (String, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#init_command ⇒ String?

Returns:

  • (String, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#load_data_local_dir ⇒ String?

Returns:

  • (String, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#local_infile ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#password ⇒ String?

Returns:

  • (String, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#port ⇒ Integer, ...

Returns:

  • (Integer, String, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#read_timeout ⇒ Numeric?

Returns:

  • (Numeric, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#socket ⇒ String?

Returns socket filename.

Returns:

  • (String, nil) —

    socket filename



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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#ssl_mode ⇒ String, Integer

Returns 1 or “disabled” / 2 or “preferred” / 3 or “required”.

Returns:

  • (String, Integer) —

    1 or "disabled" / 2 or "preferred" / 3 or "required"



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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#username ⇒ String?

Returns:

  • (String, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

#write_timeout ⇒ Numeric?

Returns:

  • (Numeric, nil) 


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# File 'lib/mysql.rb', line 56

DEFAULT_OPTS = {
  host: nil,
  username: nil,
  password: nil,
  database: nil,
  port: nil,
  socket: nil,
  flags: 0,
  charset: nil,
  connect_timeout: nil,
  read_timeout: nil,
  write_timeout: nil,
  init_command: nil,
  local_infile: nil,
  load_data_local_dir: nil,
  ssl_mode: SSL_MODE_PREFERRED,
  get_server_public_key: false,
}.freeze

Class Method Details

.connect(*args, **opts) ⇒ Mysql

Make Mysql object and connect to mysqld. parameter is same as arguments for #initialize.

Returns:



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# File 'lib/mysql.rb', line 82

def connect(*args, **opts)
  self.new(*args, **opts).connect
end

.escape_string(str) ⇒ String

Escape special character in string.

Parameters:

  • str (String)

Returns:

  • (String) 


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# File 'lib/mysql.rb', line 89

def escape_string(str)
  str.gsub(/[\0\n\r\\\'\"\x1a]/) do |s|
    case s
    when "\0" then "\\0"
    when "\n" then "\\n"
    when "\r" then "\\r"
    when "\x1a" then "\\Z"
    else "\\#{s}"
    end
  end
end

.quote ⇒ String

Escape special character in string.

Parameters:

  • str (String)

Returns:

  • (String) 


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# File 'lib/mysql.rb', line 100

def escape_string(str)
  str.gsub(/[\0\n\r\\\'\"\x1a]/) do |s|
    case s
    when "\0" then "\\0"
    when "\n" then "\\n"
    when "\r" then "\\r"
    when "\x1a" then "\\Z"
    else "\\#{s}"
    end
  end
end

Instance Method Details

#affected_rows ⇒ Integer

Returns number of affected records by insert/update/delete.

Returns:

  • (Integer) —

    number of affected records by insert/update/delete.



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# File 'lib/mysql.rb', line 306

def affected_rows
  @protocol ? @protocol.affected_rows : 0
end

#autocommit(flag) ⇒ Mysql

Set autocommit mode

Parameters:

  • flag (Boolean)

Returns:



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# File 'lib/mysql.rb', line 486

def autocommit(flag)
  query "set autocommit=#{flag ? 1 : 0}"
  self
end

#character_set_name ⇒ String

Returns charset name.

Returns:

  • (String) —

    charset name



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# File 'lib/mysql.rb', line 259

def character_set_name
  @protocol.charset.name
end

#charset ⇒ Mysql::Charset

Returns character set of MySQL connection.

Returns:



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# File 'lib/mysql.rb', line 242

def charset
  @opts[:charset]
end

#charset=(cs) ⇒ Object

Set charset of MySQL connection.

Parameters:



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# File 'lib/mysql.rb', line 248

def charset=(cs)
  charset = cs.is_a?(Charset) ? cs : Charset.by_name(cs)
  if @protocol
    @protocol.charset = charset
    query "SET NAMES #{charset.name}"
  end
  @opts[:charset] = charset
  cs
end

#close ⇒ Mysql

Disconnect from mysql.

Returns:



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# File 'lib/mysql.rb', line 214

def close
  if @protocol
    @protocol.quit_command
    @protocol = nil
  end
  return self
end

#close! ⇒ Mysql

Disconnect from mysql without QUIT packet.

Returns:



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# File 'lib/mysql.rb', line 224

def close!
  if @protocol
    @protocol.close
    @protocol = nil
  end
  return self
end

#commit ⇒ Mysql

Commit transaction

Returns:



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# File 'lib/mysql.rb', line 471

def commit
  query 'commit'
  self
end

#connect(*args, **opts) ⇒ Mysql

Connect to mysqld. parameter is same as arguments for #initialize.

Returns:



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# File 'lib/mysql.rb', line 153

def connect(*args, **opts)
  parse_args(args, opts)
  if @opts[:flags] & CLIENT_COMPRESS != 0
    warn 'unsupported flag: CLIENT_COMPRESS' if $VERBOSE
    @opts[:flags] &= ~CLIENT_COMPRESS
  end
  @protocol = Protocol.new(@opts)
  @protocol.authenticate
  @host_info = (@opts[:host].nil? || @opts[:host] == "localhost") ? 'Localhost via UNIX socket' : "#{@opts[:host]} via TCP/IP"
  query @opts[:init_command] if @opts[:init_command]
  return self
end

#errno ⇒ Integer

Returns last error number.

Returns:

  • (Integer) —

    last error number



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# File 'lib/mysql.rb', line 264

def errno
  @last_error ? @last_error.errno : 0
end

#error ⇒ String

Returns last error message.

Returns:

  • (String) —

    last error message



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# File 'lib/mysql.rb', line 269

def error
  @last_error && @last_error.error
end

#escape_string(str) ⇒ Object Also known as: quote

Escape special character in MySQL.

return [String]

Parameters:

  • str (String) 


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# File 'lib/mysql.rb', line 236

def escape_string(str)
  self.class.escape_string str
end

#field_count ⇒ Integer

Returns number of columns for last query.

Returns:

  • (Integer) —

    number of columns for last query



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# File 'lib/mysql.rb', line 279

def field_count
  @fields.size
end

#host_info ⇒ String

Returns connection type.

Returns:

  • (String) —

    connection type



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# File 'lib/mysql.rb', line 284

def host_info
  @host_info
end

#info ⇒ String

Returns information for last query.

Returns:

  • (String) —

    information for last query



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# File 'lib/mysql.rb', line 301

def info
  @protocol && @protocol.message
end

#insert_id ⇒ Integer

Returns latest auto_increment value.

Returns:

  • (Integer) —

    latest auto_increment value



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# File 'lib/mysql.rb', line 311

def insert_id
  @protocol ? @protocol.insert_id : 0
end

#kill(pid) ⇒ Mysql

Kill query.

Parameters:

  • pid (Integer) —

    thread id

Returns:



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# File 'lib/mysql.rb', line 323

def kill(pid)
  check_connection
  @protocol.kill_command pid
  self
end

#more_results ⇒ Boolean Also known as: more_results?

Returns true if multiple queries are specified and unexecuted queries exists.

Returns:

  • (Boolean) —

    true if multiple queries are specified and unexecuted queries exists.



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# File 'lib/mysql.rb', line 391

def more_results
  @protocol.server_status & SERVER_MORE_RESULTS_EXISTS != 0
end

#next_result ⇒ Boolean

execute next query if multiple queries are specified.

Returns:

  • (Boolean) —

    true if next query exists.



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# File 'lib/mysql.rb', line 398

def next_result
  return false unless more_results
  check_connection
  @fields = nil
  nfields = @protocol.get_result
  if nfields
    @fields = @protocol.retr_fields nfields
    @result_exist = true
  end
  return true
end

#parse_args(args, opts) ⇒ Object 



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# File 'lib/mysql.rb', line 166

def parse_args(args, opts)
  case args[0]
  when URI
    uri = args[0]
  when /\Amysql:\/\//
    uri = URI.parse(args[0])
  when String
    @opts[:host], user, passwd, dbname, port, socket, flags = *args
    @opts[:username] = user if user
    @opts[:password] = passwd if passwd
    @opts[:database] = dbname if dbname
    @opts[:port] = port if port
    @opts[:socket] = socket if socket
    @opts[:flags] = flags if flags
  when Hash
    # skip
  when nil
    # skip
  end
  if uri
    host = uri.hostname.to_s
    host = URI.decode_www_form_component(host)
    if host.start_with?('/')
      @opts[:socket] = host
      host = ''
    end
    @opts[:host] = host
    @opts[:username] = URI.decode_www_form_component(uri.user.to_s)
    @opts[:password] = URI.decode_www_form_component(uri.password.to_s)
    @opts[:database] = uri.path.sub(/\A\/+/, '')
    @opts[:port] = uri.port
    opts = URI.decode_www_form(uri.query).to_h.transform_keys(&:intern).merge(opts) if uri.query
    opts[:flags] = opts[:flags].to_i if opts[:flags]
  end
  if args.last.kind_of? Hash
    opts = opts.merge(args.last)
  end
  @opts.update(opts)
end

#ping ⇒ Mysql

Check whether the connection is available.

Returns:



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# File 'lib/mysql.rb', line 428

def ping
  check_connection
  @protocol.ping_command
  self
end

#prepare(str) ⇒ Mysql::Stmt

Parse prepared-statement.

Parameters:

  • str (String) —

    query string

Returns:



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# File 'lib/mysql.rb', line 413

def prepare(str)
  st = Stmt.new @protocol
  st.prepare str
  st
end

#query(str) ⇒ Mysql::Result? #query(str) {|Mysql::Result| ... } ⇒ self

Execute query string.

Examples:

my.query("select 1,NULL,'abc'").fetch  # => [1, nil, "abc"]
my.query("select 1,NULL,'abc'"){|res| res.fetch}

Overloads:

  • #query(str) ⇒ Mysql::Result?

    Parameters:

    • str (String) —

      Query.

    Returns:

    • (Mysql::Result)
    • (nil) —

      if the query does not return result set.

  • #query(str) {|Mysql::Result| ... } ⇒ self

    Parameters:

    • str (String) —

      Query.

    Yields:

    Returns:

    • (self) 


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# File 'lib/mysql.rb', line 341

def query(str, &block)
  check_connection
  @fields = nil
  begin
    nfields = @protocol.query_command str
    if nfields
      @fields = @protocol.retr_fields nfields
      @result_exist = true
    end
    if block
      while true
        block.call store_result if @fields
        break unless next_result
      end
      return self
    end
    return @fields ? store_result : nil
  rescue ServerError => e
    @last_error = e
    @sqlstate = e.sqlstate
    raise
  end
end

#refresh(op) ⇒ Mysql

Flush tables or caches.

Parameters:

  • op (Integer) —

    operation. Use Mysql::REFRESH_* value.

Returns:



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# File 'lib/mysql.rb', line 437

def refresh(op)
  check_connection
  @protocol.refresh_command op
  self
end

#reload ⇒ Mysql

Reload grant tables.

Returns:



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# File 'lib/mysql.rb', line 445

def reload
  refresh Mysql::REFRESH_GRANT
end

#rollback ⇒ Mysql

Rollback transaction

Returns:



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# File 'lib/mysql.rb', line 478

def rollback
  query 'rollback'
  self
end

#select_db(db) ⇒ Mysql

Select default database

Returns:



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# File 'lib/mysql.rb', line 451

def select_db(db)
  query "use #{db}"
  self
end

#server_info ⇒ String

Returns server version.

Returns:

  • (String) —

    server version



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# File 'lib/mysql.rb', line 289

def server_info
  check_connection
  @protocol.server_info
end

#server_version ⇒ Integer

Returns server version.

Returns:

  • (Integer) —

    server version



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# File 'lib/mysql.rb', line 295

def server_version
  check_connection
  @protocol.server_version
end

#set_server_option(opt) ⇒ Mysql

Set server option.

Parameters:

  • opt (Integer) —

    OPTION_MULTI_STATEMENTS_ON or OPTION_MULTI_STATEMENTS_OFF

Returns:



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# File 'lib/mysql.rb', line 384

def set_server_option(opt)
  check_connection
  @protocol.set_option_command opt
  self
end

#shutdown(level = 0) ⇒ Mysql

shutdown server.

Returns:



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# File 'lib/mysql.rb', line 458

def shutdown(level=0)
  check_connection
  @protocol.shutdown_command level
  self
end

#sqlstate ⇒ String

Returns sqlstate for last error.

Returns:

  • (String) —

    sqlstate for last error



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# File 'lib/mysql.rb', line 274

def sqlstate
  @last_error ? @last_error.sqlstate : "00000"
end

#stat ⇒ String

Returns statistics message.

Returns:

  • (String) —

    statistics message



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# File 'lib/mysql.rb', line 465

def stat
  @protocol ? @protocol.statistics_command : 'MySQL server has gone away'
end

#store_result ⇒ Mysql::Result

Get all data for last query.

Returns:

Raises:

  • (ClientError) 


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# File 'lib/mysql.rb', line 367

def store_result
  check_connection
  raise ClientError, 'invalid usage' unless @result_exist
  res = Result.new @fields, @protocol
  @result_exist = false
  res
end

#thread_id ⇒ Integer

Returns Thread ID.

Returns:

  • (Integer) —

    Thread ID



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# File 'lib/mysql.rb', line 376

def thread_id
  check_connection
  @protocol.thread_id
end

#warning_count ⇒ Integer

Returns number of warnings for previous query.

Returns:

  • (Integer) —

    number of warnings for previous query



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# File 'lib/mysql.rb', line 316

def warning_count
  @protocol ? @protocol.warning_count : 0
end