Class: Mysql2::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/mysql2/client.rb,
ext/mysql2/client.c

Direct Known Subclasses

EM::Client

Constant Summary collapse

@@default_query_options = 
{
  :as => :hash,                   # the type of object you want each row back as; also supports :array (an array of values)
  :async => false,                # don't wait for a result after sending the query, you'll have to monitor the socket yourself then eventually call Mysql2::Client#async_result
  :cast_booleans => false,        # cast tinyint(1) fields as true/false in ruby
  :symbolize_keys => false,       # return field names as symbols instead of strings
  :database_timezone => :local,   # timezone Mysql2 will assume datetime objects are stored in
  :application_timezone => nil,   # timezone Mysql2 will convert to before handing the object back to the caller
  :cache_rows => true,            # tells Mysql2 to use it's internal row cache for results
  :connect_flags => REMEMBER_OPTIONS | LONG_PASSWORD | LONG_FLAG | TRANSACTIONS | PROTOCOL_41 | SECURE_CONNECTION,
  :cast => true
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Client

Returns a new instance of Client.



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/mysql2/client.rb', line 16

def initialize(opts = {})
  opts = Mysql2::Util.key_hash_as_symbols( opts )
  @read_timeout = nil
  @query_options = @@default_query_options.dup
  @query_options.merge! opts

  initialize_ext

  # Set MySQL connection options (each one is a call to mysql_options())
  [:reconnect, :connect_timeout, :local_infile, :read_timeout, :write_timeout].each do |key|
    next unless opts.key?(key)
    case key
    when :reconnect, :local_infile
      send(:"#{key}=", !!opts[key])
    when :connect_timeout, :read_timeout, :write_timeout
      send(:"#{key}=", opts[key].to_i)
    else
      send(:"#{key}=", opts[key])
    end
  end

  # force the encoding to utf8
  self.charset_name = opts[:encoding] || 'utf8'

  ssl_options = opts.values_at(:sslkey, :sslcert, :sslca, :sslcapath, :sslcipher)
  ssl_set(*ssl_options) if ssl_options.any?

  if [:user,:pass,:hostname,:dbname,:db,:sock].any?{|k| @query_options.has_key?(k) }
    warn "============= WARNING FROM mysql2 ============="
    warn "The options :user, :pass, :hostname, :dbname, :db, and :sock will be deprecated at some point in the future."
    warn "Instead, please use :username, :password, :host, :port, :database, :socket, :flags for the options."
    warn "============= END WARNING FROM mysql2 ========="
  end

  user     = opts[:username] || opts[:user]
  pass     = opts[:password] || opts[:pass]
  host     = opts[:host] || opts[:hostname] || 'localhost'
  port     = opts[:port] || 3306
  database = opts[:database] || opts[:dbname] || opts[:db]
  socket   = opts[:socket] || opts[:sock]
  flags    = opts[:flags] ? opts[:flags] | @query_options[:connect_flags] : @query_options[:connect_flags]

  connect user, pass, host, port, database, socket, flags
end

Instance Attribute Details

#query_options ⇒ Object (readonly)

Returns the value of attribute query_options.



3
4
5
 
# File 'lib/mysql2/client.rb', line 3

def query_options
  @query_options
end

#read_timeout ⇒ Object (readonly)

Returns the value of attribute read_timeout.



3
4
5
 
# File 'lib/mysql2/client.rb', line 3

def read_timeout
  @read_timeout
end

Class Method Details

.default_query_options ⇒ Object 



61
62
63
 
# File 'lib/mysql2/client.rb', line 61

def self.default_query_options
  @@default_query_options
end

.Mysql2::Client.escape(string) ⇒ Object

Escape string so that it may be used in a SQL statement. Note that this escape method is not connection encoding aware. If you need encoding support use Mysql2::Client#escape instead.



228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
 
# File 'ext/mysql2/client.c', line 228

static VALUE rb_mysql_client_escape(RB_MYSQL_UNUSED VALUE klass, VALUE str) {
  unsigned char *newStr;
  VALUE rb_str;
  unsigned long newLen, oldLen;

  Check_Type(str, T_STRING);

  oldLen = RSTRING_LEN(str);
  newStr = xmalloc(oldLen*2+1);

  newLen = mysql_escape_string((char *)newStr, StringValuePtr(str), oldLen);
  if (newLen == oldLen) {
    /* no need to return a new ruby string if nothing changed */
    xfree(newStr);
    return str;
  } else {
    rb_str = rb_str_new((const char*)newStr, newLen);
#ifdef HAVE_RUBY_ENCODING_H
    rb_enc_copy(rb_str, str);
#endif
    xfree(newStr);
    return rb_str;
  }
}

Instance Method Details

#abandon_results! ⇒ Object

When using MULTI_STATEMENTS support, calling this will throw away any unprocessed results as fast as it can in order to put the connection back into a state where queries can be issued again.



532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
 
# File 'ext/mysql2/client.c', line 532

static VALUE rb_mysql_client_abandon_results(VALUE self) {
  GET_CLIENT(self);

  MYSQL_RES *result;
  int ret;

  while (mysql_more_results(wrapper->client) == 1) {
    ret = mysql_next_result(wrapper->client);
    if (ret > 0) {
      rb_raise_mysql2_error(wrapper);
    }

    result = (MYSQL_RES *)rb_thread_blocking_region(nogvl_store_result, wrapper, RUBY_UBF_IO, 0);

    if (result != NULL) {
      mysql_free_result(result);
    }
  }

  return Qnil;
}

#affected_rows ⇒ Object

returns the number of rows changed, deleted, or inserted by the last statement if it was an UPDATE, DELETE, or INSERT.



834
835
836
837
838
839
840
841
842
843
844
 
# File 'ext/mysql2/client.c', line 834

static VALUE rb_mysql_client_affected_rows(VALUE self) {
  my_ulonglong retVal;
  GET_CLIENT(self);

  REQUIRE_CONNECTED(wrapper);
  retVal = mysql_affected_rows(wrapper->client);
  if (retVal == (my_ulonglong)-1) {
    rb_raise_mysql2_error(wrapper);
  }
  return ULL2NUM(retVal);
}

#async_result ⇒ Object

Returns the result for the last async issued query.



394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
 
# File 'ext/mysql2/client.c', line 394

static VALUE rb_mysql_client_async_result(VALUE self) {
  MYSQL_RES * result;
  VALUE resultObj;
  VALUE current, is_streaming;
  GET_CLIENT(self);

  /* if we're not waiting on a result, do nothing */
  if (NIL_P(wrapper->active_thread))
    return Qnil;

  REQUIRE_CONNECTED(wrapper);
  if (rb_thread_blocking_region(nogvl_read_query_result, wrapper->client, RUBY_UBF_IO, 0) == Qfalse) {
    /* an error occurred, mark this connection inactive */
    MARK_CONN_INACTIVE(self);
    return rb_raise_mysql2_error(wrapper);
  }

  is_streaming = rb_hash_aref(rb_iv_get(self, "@current_query_options"), sym_stream);
  if(is_streaming == Qtrue) {
    result = (MYSQL_RES *)rb_thread_blocking_region(nogvl_use_result, wrapper, RUBY_UBF_IO, 0);
  } else {
    result = (MYSQL_RES *)rb_thread_blocking_region(nogvl_store_result, wrapper, RUBY_UBF_IO, 0);
  }

  if (result == NULL) {
    if (mysql_errno(wrapper->client) != 0) {
      MARK_CONN_INACTIVE(self);
      rb_raise_mysql2_error(wrapper);
    }
    /* no data and no error, so query was not a SELECT */
    return Qnil;
  }

  current = rb_hash_dup(rb_iv_get(self, "@current_query_options"));
  RB_GC_GUARD(current);
  Check_Type(current, T_HASH);
  resultObj = rb_mysql_result_to_obj(self, wrapper->encoding, current, result);

  return resultObj;
}

#close ⇒ Object

Immediately disconnect from the server, normally the garbage collector will disconnect automatically when a connection is no longer needed. Explicitly closing this will free up server resources sooner than waiting for the garbage collector.



315
316
317
318
319
320
321
322
323
 
# File 'ext/mysql2/client.c', line 315

static VALUE rb_mysql_client_close(VALUE self) {
  GET_CLIENT(self);

  if (wrapper->connected) {
    rb_thread_blocking_region(nogvl_close, wrapper, RUBY_UBF_IO, 0);
  }

  return Qnil;
}

#encoding ⇒ Object

Returns the encoding set on the client.



987
988
989
990
 
# File 'ext/mysql2/client.c', line 987

static VALUE rb_mysql_client_encoding(VALUE self) {
  GET_CLIENT(self);
  return wrapper->encoding;
}

#escape(string) ⇒ Object

Escape string so that it may be used in a SQL statement.



640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
 
# File 'ext/mysql2/client.c', line 640

static VALUE rb_mysql_client_real_escape(VALUE self, VALUE str) {
  unsigned char *newStr;
  VALUE rb_str;
  unsigned long newLen, oldLen;
#ifdef HAVE_RUBY_ENCODING_H
  rb_encoding *default_internal_enc;
  rb_encoding *conn_enc;
#endif
  GET_CLIENT(self);

  REQUIRE_CONNECTED(wrapper);
  Check_Type(str, T_STRING);
#ifdef HAVE_RUBY_ENCODING_H
  default_internal_enc = rb_default_internal_encoding();
  conn_enc = rb_to_encoding(wrapper->encoding);
  /* ensure the string is in the encoding the connection is expecting */
  str = rb_str_export_to_enc(str, conn_enc);
#endif

  oldLen = RSTRING_LEN(str);
  newStr = xmalloc(oldLen*2+1);

  newLen = mysql_real_escape_string(wrapper->client, (char *)newStr, StringValuePtr(str), oldLen);
  if (newLen == oldLen) {
    /* no need to return a new ruby string if nothing changed */
    xfree(newStr);
    return str;
  } else {
    rb_str = rb_str_new((const char*)newStr, newLen);
#ifdef HAVE_RUBY_ENCODING_H
    rb_enc_associate(rb_str, conn_enc);
    if (default_internal_enc) {
      rb_str = rb_str_export_to_enc(rb_str, default_internal_enc);
    }
#endif
    xfree(newStr);
    return rb_str;
  }
}

#info ⇒ Object

Returns a string that represents the client library version.



742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
 
# File 'ext/mysql2/client.c', line 742

static VALUE rb_mysql_client_info(VALUE self) {
  VALUE version, client_info;
#ifdef HAVE_RUBY_ENCODING_H
  rb_encoding *default_internal_enc;
  rb_encoding *conn_enc;
#endif
  GET_CLIENT(self);
  version = rb_hash_new();

#ifdef HAVE_RUBY_ENCODING_H
  default_internal_enc = rb_default_internal_encoding();
  conn_enc = rb_to_encoding(wrapper->encoding);
#endif

  rb_hash_aset(version, sym_id, LONG2NUM(mysql_get_client_version()));
  client_info = rb_str_new2(mysql_get_client_info());
#ifdef HAVE_RUBY_ENCODING_H
  rb_enc_associate(client_info, conn_enc);
  if (default_internal_enc) {
    client_info = rb_str_export_to_enc(client_info, default_internal_enc);
  }
#endif
  rb_hash_aset(version, sym_version, client_info);
  return version;
}

#last_id ⇒ Object

Returns the value generated for an AUTO_INCREMENT column by the previous INSERT or UPDATE statement.



822
823
824
825
826
 
# File 'ext/mysql2/client.c', line 822

static VALUE rb_mysql_client_last_id(VALUE self) {
  GET_CLIENT(self);
  REQUIRE_CONNECTED(wrapper);
  return ULL2NUM(mysql_insert_id(wrapper->client));
}

#more_results? ⇒ Boolean

Returns true or false if there are more results to process.

Returns:

  • (Boolean) 


920
921
922
923
924
925
926
927
 
# File 'ext/mysql2/client.c', line 920

static VALUE rb_mysql_client_more_results(VALUE self)
{
  GET_CLIENT(self);
    if (mysql_more_results(wrapper->client) == 0)
      return Qfalse;
    else
      return Qtrue;
}

#next_result ⇒ Object

Fetch the next result set from the server. Returns nothing.



935
936
937
938
939
940
941
942
943
944
945
946
947
948
 
# File 'ext/mysql2/client.c', line 935

static VALUE rb_mysql_client_next_result(VALUE self)
{
    GET_CLIENT(self);
    int ret;
    ret = mysql_next_result(wrapper->client);
    if (ret > 0) {
      rb_raise_mysql2_error(wrapper);
      return Qfalse;
    } else if (ret == 0) {
      return Qtrue;
    } else {
      return Qfalse;
    }
}

#ping ⇒ Object

Checks whether the connection to the server is working. If the connection has gone down and auto-reconnect is enabled an attempt to reconnect is made. If the connection is down and auto-reconnect is disabled, ping returns an error.



905
906
907
908
909
910
911
912
913
 
# File 'ext/mysql2/client.c', line 905

static VALUE rb_mysql_client_ping(VALUE self) {
  GET_CLIENT(self);

  if (!wrapper->connected) {
    return Qfalse;
  } else {
    return rb_thread_blocking_region(nogvl_ping, wrapper->client, RUBY_UBF_IO, 0);
  }
}

#query(sql, options = {}) ⇒ Object

Query the database with sql, with optional options. For the possible options, see @@default_query_options on the Mysql2::Client class.



560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
 
# File 'ext/mysql2/client.c', line 560

static VALUE rb_mysql_client_query(int argc, VALUE * argv, VALUE self) {
#ifndef _WIN32
  struct async_query_args async_args;
#endif
  struct nogvl_send_query_args args;
  int async = 0;
  VALUE opts, current;
  VALUE thread_current = rb_thread_current();
#ifdef HAVE_RUBY_ENCODING_H
  rb_encoding *conn_enc;
#endif
  GET_CLIENT(self);

  REQUIRE_CONNECTED(wrapper);
  args.mysql = wrapper->client;

  current = rb_hash_dup(rb_iv_get(self, "@query_options"));
  RB_GC_GUARD(current);
  Check_Type(current, T_HASH);
  rb_iv_set(self, "@current_query_options", current);

  if (rb_scan_args(argc, argv, "11", &args.sql, &opts) == 2) {
    rb_funcall(current, intern_merge_bang, 1, opts);

    if (rb_hash_aref(current, sym_async) == Qtrue) {
      async = 1;
    }
  }

  Check_Type(args.sql, T_STRING);
#ifdef HAVE_RUBY_ENCODING_H
  conn_enc = rb_to_encoding(wrapper->encoding);
  /* ensure the string is in the encoding the connection is expecting */
  args.sql = rb_str_export_to_enc(args.sql, conn_enc);
#endif
  args.sql_ptr = StringValuePtr(args.sql);
  args.sql_len = RSTRING_LEN(args.sql);

  /* see if this connection is still waiting on a result from a previous query */
  if (NIL_P(wrapper->active_thread)) {
    /* mark this connection active */
    wrapper->active_thread = thread_current;
  } else if (wrapper->active_thread == thread_current) {
    rb_raise(cMysql2Error, "This connection is still waiting for a result, try again once you have the result");
  } else {
    VALUE inspect = rb_inspect(wrapper->active_thread);
    const char *thr = StringValueCStr(inspect);

    rb_raise(cMysql2Error, "This connection is in use by: %s", thr);
    RB_GC_GUARD(inspect);
  }

  args.wrapper = wrapper;

#ifndef _WIN32
  rb_rescue2(do_send_query, (VALUE)&args, disconnect_and_raise, self, rb_eException, (VALUE)0);

  if (!async) {
    async_args.fd = wrapper->client->net.fd;
    async_args.self = self;

    rb_rescue2(do_query, (VALUE)&async_args, disconnect_and_raise, self, rb_eException, (VALUE)0);

    return rb_mysql_client_async_result(self);
  } else {
    return Qnil;
  }
#else
  do_send_query(&args);

  /* this will just block until the result is ready */
  return rb_ensure(rb_mysql_client_async_result, self, finish_and_mark_inactive, self);
#endif
}

#query_info ⇒ Object 



65
66
67
68
69
70
71
 
# File 'lib/mysql2/client.rb', line 65

def query_info
  info = query_info_string
  return {} unless info
  info_hash = {}
  info.split.each_slice(2) { |s| info_hash[s[0].downcase.delete(':').to_sym] = s[1].to_i }
  info_hash
end

#query_info_string ⇒ Object 



262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
 
# File 'ext/mysql2/client.c', line 262

static VALUE rb_mysql_info(VALUE self) {
  const char *info;
  VALUE rb_str;
  GET_CLIENT(self);

  info = mysql_info(wrapper->client);

  if (info == NULL) {
    return Qnil;
  }

  rb_str = rb_str_new2(info);
#ifdef HAVE_RUBY_ENCODING_H
  rb_enc_associate(rb_str, rb_utf8_encoding());
#endif

  return rb_str;
}

#reconnect=(true) ⇒ Object

Enable or disable the automatic reconnect behavior of libmysql. Read dev.mysql.com/doc/refman/5.5/en/auto-reconnect.html for more information.



1000
1001
1002
 
# File 'ext/mysql2/client.c', line 1000

static VALUE set_reconnect(VALUE self, VALUE value) {
  return _mysql_client_options(self, MYSQL_OPT_RECONNECT, value);
}

#select_db(name) ⇒ Object

Causes the database specified by name to become the default (current) database on the connection specified by mysql.



875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
 
# File 'ext/mysql2/client.c', line 875

static VALUE rb_mysql_client_select_db(VALUE self, VALUE db)
{
  struct nogvl_select_db_args args;

  GET_CLIENT(self);
  REQUIRE_CONNECTED(wrapper);

  args.mysql = wrapper->client;
  args.db = StringValuePtr(db);

  if (rb_thread_blocking_region(nogvl_select_db, &args, RUBY_UBF_IO, 0) == Qfalse)
    rb_raise_mysql2_error(wrapper);

  return db;
}

#server_info ⇒ Object

Returns a string that represents the server version number



773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
 
# File 'ext/mysql2/client.c', line 773

static VALUE rb_mysql_client_server_info(VALUE self) {
  VALUE version, server_info;
#ifdef HAVE_RUBY_ENCODING_H
  rb_encoding *default_internal_enc;
  rb_encoding *conn_enc;
#endif
  GET_CLIENT(self);

  REQUIRE_CONNECTED(wrapper);
#ifdef HAVE_RUBY_ENCODING_H
  default_internal_enc = rb_default_internal_encoding();
  conn_enc = rb_to_encoding(wrapper->encoding);
#endif

  version = rb_hash_new();
  rb_hash_aset(version, sym_id, LONG2FIX(mysql_get_server_version(wrapper->client)));
  server_info = rb_str_new2(mysql_get_server_info(wrapper->client));
#ifdef HAVE_RUBY_ENCODING_H
  rb_enc_associate(server_info, conn_enc);
  if (default_internal_enc) {
    server_info = rb_str_export_to_enc(server_info, default_internal_enc);
  }
#endif
  rb_hash_aset(version, sym_version, server_info);
  return version;
}

#socket ⇒ Object

Return the file descriptor number for this client.



805
806
807
808
809
810
811
812
813
814
 
# File 'ext/mysql2/client.c', line 805

static VALUE rb_mysql_client_socket(VALUE self) {
  GET_CLIENT(self);
#ifndef _WIN32
  REQUIRE_CONNECTED(wrapper);
  int fd_set_fd = wrapper->client->net.fd;
  return INT2NUM(fd_set_fd);
#else
  rb_raise(cMysql2Error, "Raw access to the mysql file descriptor isn't supported on Windows");
#endif
}

#store_result ⇒ Object

Return the next result object from a query which yielded multiple result sets.



956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
 
# File 'ext/mysql2/client.c', line 956

static VALUE rb_mysql_client_store_result(VALUE self)
{
  MYSQL_RES * result;
  VALUE resultObj;
  VALUE current;
  GET_CLIENT(self);

  result = (MYSQL_RES *)rb_thread_blocking_region(nogvl_store_result, wrapper, RUBY_UBF_IO, 0);

  if (result == NULL) {
    if (mysql_errno(wrapper->client) != 0) {
      rb_raise_mysql2_error(wrapper);
    }
    /* no data and no error, so query was not a SELECT */
    return Qnil;
  }

  current = rb_hash_dup(rb_iv_get(self, "@current_query_options"));
  RB_GC_GUARD(current);
  Check_Type(current, T_HASH);
  resultObj = rb_mysql_result_to_obj(self, wrapper->encoding, current, result);

  return resultObj;
}

#thread_id ⇒ Object

Returns the thread ID of the current connection.



851
852
853
854
855
856
857
858
 
# File 'ext/mysql2/client.c', line 851

static VALUE rb_mysql_client_thread_id(VALUE self) {
  unsigned long retVal;
  GET_CLIENT(self);

  REQUIRE_CONNECTED(wrapper);
  retVal = mysql_thread_id(wrapper->client);
  return ULL2NUM(retVal);
}

#warning_count ⇒ Object 



253
254
255
256
257
258
259
260
 
# File 'ext/mysql2/client.c', line 253

static VALUE rb_mysql_client_warning_count(VALUE self) {
  unsigned int warning_count;
  GET_CLIENT(self);

  warning_count = mysql_warning_count(wrapper->client);

  return UINT2NUM(warning_count);
}