Class: Mysql2::Client

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

Direct Known Subclasses

EM::Client

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Client

Returns a new instance of Client.

Raises:



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# File 'lib/mysql2/client.rb', line 21

def initialize(opts = {})
  raise Mysql2::Error, "Options parameter must be a Hash" unless opts.is_a? Hash

  opts = Mysql2::Util.key_hash_as_symbols(opts)
  @read_timeout = nil
  @query_options = self.class.default_query_options.dup
  @query_options.merge! opts

  initialize_ext

  # Set default connect_timeout to avoid unlimited retries from signal interruption
  opts[:connect_timeout] = 120 unless opts.key?(:connect_timeout)

  # TODO: stricter validation rather than silent massaging
  %i[reconnect connect_timeout local_infile read_timeout write_timeout default_file default_group secure_auth init_command automatic_close enable_cleartext_plugin default_auth].each do |key|
    next unless opts.key?(key)

    case key
    when :reconnect, :local_infile, :secure_auth, :automatic_close, :enable_cleartext_plugin
      send(:"#{key}=", !!opts[key]) # rubocop:disable Style/DoubleNegation
    when :connect_timeout, :read_timeout, :write_timeout
      send(:"#{key}=", Integer(opts[key])) unless opts[key].nil?
    else
      send(:"#{key}=", opts[key])
    end
  end

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

  mode = parse_ssl_mode(opts[:ssl_mode]) if opts[:ssl_mode]
  if (mode == SSL_MODE_VERIFY_CA || mode == SSL_MODE_VERIFY_IDENTITY) && !opts[:sslca]
    opts[:sslca] = find_default_ca_path
  end

  ssl_options = opts.values_at(:sslkey, :sslcert, :sslca, :sslcapath, :sslcipher)
  ssl_set(*ssl_options) if ssl_options.any? || opts.key?(:sslverify)
  self.ssl_mode = mode if mode

  flags = case opts[:flags]
  when Array
    parse_flags_array(opts[:flags], @query_options[:connect_flags])
  when String
    parse_flags_array(opts[:flags].split(' '), @query_options[:connect_flags])
  when Integer
    @query_options[:connect_flags] | opts[:flags]
  else
    @query_options[:connect_flags]
  end

  # SSL verify is a connection flag rather than a mysql_ssl_set option
  flags |= SSL_VERIFY_SERVER_CERT if opts[:sslverify]

  if %i[user pass hostname dbname db sock].any? { |k| @query_options.key?(k) }
    warn "============= WARNING FROM mysql2 ============="
    warn "The options :user, :pass, :hostname, :dbname, :db, and :sock are deprecated and will be removed 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]
  port     = opts[:port]
  database = opts[:database] || opts[:dbname] || opts[:db]
  socket   = opts[:socket] || opts[:sock]

  # Correct the data types before passing these values down to the C level
  user = user.to_s unless user.nil?
  pass = pass.to_s unless pass.nil?
  host = host.to_s unless host.nil?
  port = port.to_i unless port.nil?
  database = database.to_s unless database.nil?
  socket = socket.to_s unless socket.nil?
  conn_attrs = parse_connect_attrs(opts[:connect_attrs])

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

Instance Attribute Details

#query_options ⇒ Object (readonly)

Returns the value of attribute query_options.



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

def query_options
  @query_options
end

#read_timeout ⇒ Object (readonly)

Returns the value of attribute read_timeout.



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

def read_timeout
  @read_timeout
end

Class Method Details

.default_query_options ⇒ Object 



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

def self.default_query_options
  @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 its internal row cache for results
    connect_flags: REMEMBER_OPTIONS | LONG_PASSWORD | LONG_FLAG | TRANSACTIONS | PROTOCOL_41 | SECURE_CONNECTION | CONNECT_ATTRS,
    cast: true,
    default_file: nil,
    default_group: nil,
  }
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.



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# File 'ext/mysql2/client.c', line 426

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, RSTRING_PTR(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);
    rb_enc_copy(rb_str, str);
    xfree(newStr);
    return rb_str;
  }
}

.info ⇒ Object

Returns a string that represents the client library version.



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# File 'ext/mysql2/client.c', line 1042

static VALUE rb_mysql_client_info(RB_MYSQL_UNUSED VALUE klass) {
  VALUE version_info, version, header_version;
  version_info = rb_hash_new();

  version = rb_str_new2(mysql_get_client_info());
  header_version = rb_str_new2(MYSQL_LINK_VERSION);

  rb_enc_associate(version, rb_usascii_encoding());
  rb_enc_associate(header_version, rb_usascii_encoding());

  rb_hash_aset(version_info, sym_id, LONG2NUM(mysql_get_client_version()));
  rb_hash_aset(version_info, sym_version, version);
  rb_hash_aset(version_info, sym_header_version, header_version);

  return version_info;
}

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.



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# File 'ext/mysql2/client.c', line 821

static VALUE rb_mysql_client_abandon_results(VALUE self) {
  MYSQL_RES *result;
  int ret;

  GET_CLIENT(self);

  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_call_without_gvl(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.



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# File 'ext/mysql2/client.c', line 1150

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.



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# File 'ext/mysql2/client.c', line 656

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_fiber))
    return Qnil;

  REQUIRE_CONNECTED(wrapper);
  if ((VALUE)rb_thread_call_without_gvl(nogvl_read_query_result, wrapper->client, RUBY_UBF_IO, 0) == Qfalse) {
    /* an error occurred, mark this connection inactive */
    wrapper->active_fiber = Qnil;
    rb_raise_mysql2_error(wrapper);
  }

  is_streaming = rb_hash_aref(rb_ivar_get(self, intern_current_query_options), sym_stream);
  if (is_streaming == Qtrue) {
    result = (MYSQL_RES *)rb_thread_call_without_gvl(nogvl_use_result, wrapper, RUBY_UBF_IO, 0);
  } else {
    result = (MYSQL_RES *)rb_thread_call_without_gvl(nogvl_store_result, wrapper, RUBY_UBF_IO, 0);
  }

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

  // Duplicate the options hash and put the copy in the Result object
  current = rb_hash_dup(rb_ivar_get(self, intern_current_query_options));
  (void)RB_GC_GUARD(current);
  Check_Type(current, T_HASH);
  resultObj = rb_mysql_result_to_obj(self, wrapper->encoding, current, result, Qnil);

  rb_mysql_set_server_query_flags(wrapper->client, resultObj);

  return resultObj;
}

#automatic_close=(false) ⇒ Object

Set this to false to leave the connection open after it is garbage collected. To avoid “Aborted connection” errors on the server, explicitly call close when the connection is no longer needed.

See Also:



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# File 'ext/mysql2/client.c', line 1344

static VALUE set_automatic_close(VALUE self, VALUE value) {
  GET_CLIENT(self);
  if (RTEST(value)) {
    wrapper->automatic_close = 1;
  } else {
#ifndef _WIN32
    wrapper->automatic_close = 0;
#else
    rb_warn("Connections are always closed by garbage collector on Windows");
#endif
  }
  return value;
}

#automatic_close? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/mysql2/client.c', line 1330

static VALUE get_automatic_close(VALUE self) {
  GET_CLIENT(self);
  return wrapper->automatic_close ? Qtrue : Qfalse;
}

#close ⇒ nil

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.

Returns:

  • (nil) 


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# File 'ext/mysql2/client.c', line 568

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

  if (wrapper->client) {
    rb_thread_call_without_gvl(nogvl_close, wrapper, RUBY_UBF_IO, 0);
  }

  return Qnil;
}

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/mysql2/client.c', line 583

static VALUE rb_mysql_client_closed(VALUE self) {
  GET_CLIENT(self);
  return CONNECTED(wrapper) ? Qfalse : Qtrue;
}

#encoding ⇒ Object

Returns the encoding set on the client.



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# File 'ext/mysql2/client.c', line 1320

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.



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# File 'ext/mysql2/client.c', line 900

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

  REQUIRE_CONNECTED(wrapper);
  Check_Type(str, T_STRING);
  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);

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

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

#find_default_ca_path ⇒ Object

Find any default system CA paths to handle system roots by default if stricter validation is requested and no path is provide.



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# File 'lib/mysql2/client.rb', line 128

def find_default_ca_path
  [
    "/etc/ssl/certs/ca-certificates.crt",
    "/etc/pki/tls/certs/ca-bundle.crt",
    "/etc/ssl/ca-bundle.pem",
    "/etc/ssl/cert.pem",
  ].find { |f| File.exist?(f) }
end

#info ⇒ Object 



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# File 'lib/mysql2/client.rb', line 164

def info
  self.class.info
end

#last_id ⇒ Object

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



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# File 'ext/mysql2/client.c', line 1108

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) 


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# File 'ext/mysql2/client.c', line 1253

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.



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# File 'ext/mysql2/client.c', line 1268

static VALUE rb_mysql_client_next_result(VALUE self)
{
    int ret;
    GET_CLIENT(self);
    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;
    }
}

#parse_connect_attrs(conn_attrs) ⇒ Object

Set default program_name in performance_schema.session_connect_attrs and performance_schema.session_account_connect_attrs



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# File 'lib/mysql2/client.rb', line 139

def parse_connect_attrs(conn_attrs)
  return {} if Mysql2::Client::CONNECT_ATTRS.zero?

  conn_attrs ||= {}
  conn_attrs[:program_name] ||= $PROGRAM_NAME
  conn_attrs.each_with_object({}) do |(key, value), hash|
    hash[key.to_s] = value.to_s
  end
end

#parse_flags_array(flags, initial = 0) ⇒ Object 



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# File 'lib/mysql2/client.rb', line 111

def parse_flags_array(flags, initial = 0)
  flags.reduce(initial) do |memo, f|
    fneg = f.start_with?('-') ? f[1..-1] : nil
    if fneg && fneg =~ /^\w+$/ && Mysql2::Client.const_defined?(fneg)
      memo & ~ Mysql2::Client.const_get(fneg)
    elsif f && f =~ /^\w+$/ && Mysql2::Client.const_defined?(f)
      memo | Mysql2::Client.const_get(f)
    else
      warn "Unknown MySQL connection flag: '#{f}'"
      memo
    end
  end
end

#parse_ssl_mode(mode) ⇒ Object 



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# File 'lib/mysql2/client.rb', line 100

def parse_ssl_mode(mode)
  m = mode.to_s.upcase
  if m.start_with?('SSL_MODE_')
    return Mysql2::Client.const_get(m) if Mysql2::Client.const_defined?(m)
  else
    x = 'SSL_MODE_' + m
    return Mysql2::Client.const_get(x) if Mysql2::Client.const_defined?(x)
  end
  warn "Unknown MySQL ssl_mode flag: #{mode}"
end

#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.



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# File 'ext/mysql2/client.c', line 1221

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

  if (!CONNECTED(wrapper)) {
    return Qfalse;
  } else {
    return (VALUE)rb_thread_call_without_gvl(nogvl_ping, wrapper->client, RUBY_UBF_IO, 0);
  }
}

#prepare(sql) ⇒ Object

Create a new prepared statement.



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# File 'ext/mysql2/client.c', line 1520

static VALUE rb_mysql_client_prepare_statement(VALUE self, VALUE sql) {
  GET_CLIENT(self);
  REQUIRE_CONNECTED(wrapper);

  return rb_mysql_stmt_new(self, sql);
}

#query(sql, options = {}) ⇒ Object 



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# File 'lib/mysql2/client.rb', line 149

def query(sql, options = {})
  Thread.handle_interrupt(::Mysql2::Util::TIMEOUT_ERROR_NEVER) do
    _query(sql, @query_options.merge(options))
  end
end

#query_info ⇒ Object 



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# File 'lib/mysql2/client.rb', line 155

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 



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# File 'ext/mysql2/client.c', line 458

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);
  rb_enc_associate(rb_str, rb_utf8_encoding());

  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.



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# File 'ext/mysql2/client.c', line 1365

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.



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# File 'ext/mysql2/client.c', line 1191

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 = StringValueCStr(db);

  if (rb_thread_call_without_gvl(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



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# File 'ext/mysql2/client.c', line 1064

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

  REQUIRE_CONNECTED(wrapper);
  default_internal_enc = rb_default_internal_encoding();
  conn_enc = rb_to_encoding(wrapper->encoding);

  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));
  rb_enc_associate(server_info, conn_enc);
  if (default_internal_enc) {
    server_info = rb_str_export_to_enc(server_info, default_internal_enc);
  }
  rb_hash_aset(version, sym_version, server_info);
  return version;
}

#session_track ⇒ Object

Returns information about changes to the session state on the server.



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# File 'ext/mysql2/client.c', line 1119

static VALUE rb_mysql_client_session_track(VALUE self, VALUE type) {
#ifdef CLIENT_SESSION_TRACK
  const char *data;
  size_t length;
  my_ulonglong retVal;
  GET_CLIENT(self);

  REQUIRE_CONNECTED(wrapper);
  retVal = mysql_session_track_get_first(wrapper->client, NUM2INT(type), &data, &length);
  if (retVal != 0) {
    return Qnil;
  }
  VALUE rbAry = rb_ary_new();
  VALUE rbFirst = rb_str_new(data, length);
  rb_ary_push(rbAry, rbFirst);
  while(mysql_session_track_get_next(wrapper->client, NUM2INT(type), &data, &length) == 0) {
    VALUE rbNext = rb_str_new(data, length);
    rb_ary_push(rbAry, rbNext);
  }
  return rbAry;
#else
  return Qnil;
#endif
}

#set_server_option(value) ⇒ Object

Enables or disables an option for the connection. Read dev.mysql.com/doc/refman/5.7/en/mysql-set-server-option.html for more information.



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# File 'ext/mysql2/client.c', line 1238

static VALUE rb_mysql_client_set_server_option(VALUE self, VALUE value) {
  GET_CLIENT(self);

  if (mysql_set_server_option(wrapper->client, NUM2INT(value)) == 0) {
    return Qtrue;
  } else {
    return Qfalse;
  }
}

#socket ⇒ Object 



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# File 'ext/mysql2/client.c', line 1097

static VALUE rb_mysql_client_socket(RB_MYSQL_UNUSED VALUE self) {
  rb_raise(cMysql2Error, "Raw access to the mysql file descriptor isn't supported on Windows");
}

#ssl_cipher ⇒ Object 



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# File 'ext/mysql2/client.c', line 475

static VALUE rb_mysql_get_ssl_cipher(VALUE self)
{
  const char *cipher;
  VALUE rb_str;
  GET_CLIENT(self);

  cipher = mysql_get_ssl_cipher(wrapper->client);

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

  rb_str = rb_str_new2(cipher);
  rb_enc_associate(rb_str, rb_utf8_encoding());

  return rb_str;
}

#store_result ⇒ Object

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



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# File 'ext/mysql2/client.c', line 1289

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

  result = (MYSQL_RES *)rb_thread_call_without_gvl(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;
  }

  // Duplicate the options hash and put the copy in the Result object
  current = rb_hash_dup(rb_ivar_get(self, intern_current_query_options));
  (void)RB_GC_GUARD(current);
  Check_Type(current, T_HASH);
  resultObj = rb_mysql_result_to_obj(self, wrapper->encoding, current, result, Qnil);

  return resultObj;
}

#thread_id ⇒ Object

Returns the thread ID of the current connection.



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# File 'ext/mysql2/client.c', line 1167

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 



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# File 'ext/mysql2/client.c', line 449

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);
}