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skaes-mysql

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MySQL/Ruby

MySQL/Ruby

[Japanese]


This is the MySQL API module for Ruby. It provides the same functions for Ruby programs that the MySQL C API provides for C programs.

<h2>Download</h2>
<a href="http://tmtm.org/downloads/mysql/ruby/">tmtm.org</a>

<h2>Requirement</h2>
<ul>
  <li>MySQL 5.0.51a
  <li>Ruby 1.8.5-1.8.7
</ul>
<p>
  The module may work for other versions, but that has not been verified.
</p>

<h2>License</h2>
<p>
  This program is under <a href="http://www.ruby-lang.org/en/LICENSE.txt">Ruby's license</a>.
</p>

<h2>Install</h2>
<p>
  1st:
</p>
<pre class="code">

% ruby extconf.rb

or


% ruby extconf.rb --with-mysql-dir=/usr/local/mysql

or


% ruby extconf.rb --with-mysql-config

then


% make

extconf.rb has following options:

--with-mysql-include=dir
MySQL header file directory. Default is /usr/local/include.

  <dt>--with-mysql-lib=<i>dir</i>
  <dd>
MySQL library directory. Default is /usr/local/lib.

  <dt>--with-mysql-dir=<i>dir</i>
  <dd>
Same as --with-mysql-include=<i>dir</i>/include,
--with-mysql-lib=<i>dir</i>/lib.

  <dt>--with-mysql-config[=<i>/path/to/mysql_config</i>]
  <dd>
Get compile-parameter from mysql_config command.
</dl>
<p>
  2nd:
</p>
<pre class="code">

% ruby ./test.rb -- [hostname [user [passwd [dbname [port [socket [flag]]]]]]]

<p>
  3rd:
</p>
<pre class="code">

make install

<h3>Note</h3>
<p>
  If you get error like 'libmysqlclient not found' when testing,
  you need to specify the directory in which the library is
  located so that make can find it.
</p>
<pre class="code">

% env LD_RUN_PATH=libmysqlclient.so directory make

test.rb is tested on Linux only.

<h2>Usage</h2>
<p>
  The names of methods provided by this module basically are the
  same as the names of the functions in the C API, except that the
  Ruby method names do not begin with a 'mysql_' prefix. For
  example, the Ruby query() method corresponds to the C API
  mysql_query() function. For details on the use of each Ruby
  method, see the descriptions of the corresponding C functions in
  the MySQL Reference Manual.
</p>
<p>
  Some Ruby methods may be invoked under other names that serve as
  equivalent aliases, as noted below.
</p>
<p>
  If an error occurs when a method executes, it raises a
  Mysql::Error exception.
</p>

<h2>Mysql class</h2>
<h3>CLASS METHODS</h3>
<dl>
  <dt>init()
  <dd>
<p>
  It return Mysql object. It not connect to mysqld.
</p>

  <dt>real_connect(host=nil, user=nil, passwd=nil, db=nil, port=nil, sock=nil, flag=nil)
  <dt>connect(host=nil, user=nil, passwd=nil, db=nil, port=nil, sock=nil, flag=nil)
  <dt>new(host=nil, user=nil, passwd=nil, db=nil, port=nil, sock=nil, flag=nil)
  <dd>
<p>
  connect to mysqld and return Mysql object.
</p>

  <dt>escape_string(str)
  <dt>quote(str)
  <dd>
<p>
  quote string for insert/update.
</p>

  <dt>get_client_info()
  <dt>client_info()
  <dd>
<p>
  return client version information.
</p>

  <dt>get_client_version()
  <dt>client_version()
  <dd>
<p>
  return client version as number.
</p>

  <dt>debug(str)
  <dd>
<p>
  same as C API mysql_debug().
</p>
</dl>

<h3>OBJECT METHODS</h3>
<dl>
  <dt>options(opt, val=nil)
  <dd>
<p>
  same as C API mysql_options().
</p>

  <dt>real_connect(host=nil, user=nil, passwd=nil, db=nil, port=nil, sock=nil, flag=nil)
  <dt>connect(host=nil, user=nil, passwd=nil, db=nil, port=nil, sock=nil, flag=nil)
  <dd>
<p>
  same as Mysql.real_connect().
</p>

  <dt>affected_rows()
  <dd>
<p>
  return affected rows.
</p>

  <dt>autocommit(mode)
  <dd>
<p>
  set autocommit mode.
</p>

  <dt>change_user(user=nil, passwd=nil, db=nil)
  <dd>
<p>
  change user.
</p>

  <dt>character_set_name()
  <dd>
<p>
  return character set.
</p>

  <dt>close()
  <dd>
<p>
  close connection.
</p>

  <dt>commit()
  <dd>
<p>
  commit transaction.
</p>

  <dt>create_db(db)
  <dd>
<p>
  create database.
</p>

  <dt>drop_db(db)
  <dd>
<p>
  drop database.
</p>

  <dt>dump_debug_info()
  <dd>
<p>
  same as C API mysql_dump_debug_info().
</p>

  <dt>errno()
  <dd>
<p>
  return error number.
</p>

  <dt>error()
  <dd>
<p>
  return error message.
</p>

  <dt>escape_string(str)
  <dt>quote(str)
  <dd>
<p>
  quote strings for insert/update.
  same as C API mysql_real_escape_string().
</p>

  <dt>field_count()
  <dd>
<p>
  return number of columns of last query.
</p>

  <dt>get_client_info()
  <dt>client_info()
  <dd>
<p>
  return client version information.
</p>

  <dt>get_client_version()
  <dt>client_version()
  <dd>
<p>
  return client version number.
</p>

  <dt>get_host_info()
  <dt>host_info()
  <dd>
<p>
  return connection information.
</p>

  <dt>get_proto_info()
  <dt>proto_info()
  <dd>
<p>
  return connection protocol version.
</p>

  <dt>get_server_info()
  <dt>server_info()
  <dd>
<p>
  return server version information.
</p>

  <dt>get_server_version()
  <dt>server_version()
  <dd>
<p>
  return server version number.
</p>

  <dt>info()
  <dd>
<p>
  return information of last query.
</p>

  <dt>insert_id()
  <dd>
<p>
  return last AUTO_INCREMENT value.
</p>

  <dt>kill(id)
  <dd>
<p>
  kill thread.
</p>

  <dt>list_dbs(db=nil)
  <dd>
<p>
  return database list.
</p>

  <dt>list_fields(table, field=nil)
  <dd>
<p>
  return Mysql::Result object.
</p>

  <dt>list_processes()
  <dd>
<p>
  return Mysql::Result object.
</p>

  <dt>list_tables(table=nil)
  <dd>
<p>
  return table list Array.
</p>

  <dt>more_results?()
  <dd>
<p>
  returns true if more results exist from the currently executed query.
</p>

  <dt>next_result()
  <dd>
<p>
  returns true if more results exist from the currently executed query.
  after this, you do store_result() to get result table of query.
</p>

  <dt>ping()
  <dd>
<p>
  check server.
</p>

  <dt>prepare(q)
  <dd>
<p>
</p>

  <dt>query(q)
  <dt>real_query(q)
  <dd>
<p>
  do query and store_result(). return Mysql::Result object.
  If query_with_result is false, it does not store_result().
</p>

  <dt>query(q) {|res| ...}
  <dt>real_query(q) {|res| ...}
  <dd>
<p>
  do query and execute block with Mysql::Result object.
  if you specify multiple query, then repeat block.
  set_server_option(Mysql::OPTION_MULTI_STATEMENTS) is executed automatically.
</p>

  <dt>refresh(r)
  <dd>
<p>
  flush server log or cache.
</p>

  <dt>reload()
  <dd>
<p>
  reload access privilege table.
</p>

  <dt>rollback()
  <dd>
<p>
  rollback transaction.
</p>

  <dt>select_db(db)
  <dd>
<p>
  select database.
</p>

  <dt>set_server_option(opt)
  <dd>
<p>
  set option to server.
  options is one of Mysql::OPTION_MULTI_STATEMENTS_ON, Mysql::OPTION_MULTI_STATEMENTS_OFF.
</p>

  <dt>shutdown()
  <dd>
<p>
  shutdown server.
</p>

  <dt>ssl_set(key=nil, cert=nil, ca=nil, capath=nil, cipher=nil)
  <dd>
<p>
  use SSL.
</p>

  <dt>stat()
  <dd>
<p>
  return server status.
</p>

  <dt>stmt_init()
  <dd>
<p>
  return Mysql::Stmt class object.
</p>

  <dt>store_result()
  <dd>
<p>
  return Mysql::Result object.
</p>

  <dt>thread_id()
  <dd>
<p>
  retrun thread id.
</p>

  <dt>use_result()
  <dd>
<p>
  return Mysql::Result object.
</p>

  <dt>warning_count()
  <dd>
<p>
  return warning count last query.
</p>
</dl>

<h3>OBJECT VARIABLES</h3>

<dl>
  <dt>query_with_result
  <dd>
<p>
  If true, query() also invokes store_result() and returns a
  Mysql::Result object.  Default is true.
</p>

  <dt>reconnect
  <dd>
<p>
  If true, reconnect to server automatically when disconect to server.
  Default is false.
</p>

</dl>

<h2>Mysql::Result class</h2>

<h3>OBJECT METHODS</h3>
<dl>
  <dt>free()
  <dd>
<p>
  free memory of result table.
</p>

  <dt>data_seek(offset)
  <dd>
<p>
  seek row.
</p>

  <dt>fetch_field()
  <dd>
<p>
  return next Mysql::Field object.
</p>

  <dt>fetch_fields()
  <dd>
<p>
  return Array of Mysql::Field object.
</p>

  <dt>fetch_field_direct(fieldnr)
  <dd>
<p>
  return Mysql::Field object.
</p>

  <dt>fetch_lengths()
  <dd>
<p>
  return Array of field length.
</p>

  <dt>fetch_row()
  <dd>
<p>
  return row as Array.
</p>

  <dt>fetch_hash(with_table=false)
  <dd>
<p>
  return row as Hash.
  If with_table is true, hash key format is "tablename.fieldname".
</p>

  <dt>field_seek(offset)
  <dd>
<p>
  seek field.
</p>

  <dt>field_tell()
  <dd>
<p>
  return field position.
</p>

  <dt>num_fields()
  <dd>
<p>
  return number of fields.
</p>

  <dt>num_rows()
  <dd>
<p>
  return number of rows.
</p>

  <dt>row_seek(offset)
  <dd>
<p>
  seek row.
</p>

  <dt>row_tell()
  <dd>
<p>
  return row position.
</p>
</dl>

<h3>ITERATOR</h3>
<dl>
  <dt>each() {|x| ...}
  <dd>
<p>
  'x' is array of column values.
</p>

  <dt>each_hash(with_table=false) {|x| ...}
  <dd>
<p>
  'x' is hash of column values, and the keys are the column names.
</p>
</dl>

<h2>Mysql::Field class</h2>

<h3>OBJECT VARIABLES(read only)</h3>
<dl>
  <dt>name<dd>field name
  <dt>table<dd>table name
  <dt>def<dd>default value
  <dt>type<dd>field type
  <dt>length<dd>field length
  <dt>max_length<dd>max field length
  <dt>flags<dd>field flag
  <dt>decimals<dd>number of decimals
</dl>

<h3>OBJECT METHODS</h3>
<dl>
  <dt>hash()
  <dd>
<p>
  return field as Hash.
</p>
<p>
  ex.) obj.name == obj.hash['name']
</p>

  <dt>is_not_null?()
  <dd>
<p>
  True if this field is defined as NOT NULL.
</p>

  <dt>is_num?()
  <dd>
<p>
  True if this field type is numeric.
</p>

  <dt>is_pri_key?()
  <dd>
<p>
  True if this field is a primary key.
</p>

  <dt>inspect()
  <dd>
<p>
  return "#&lt;Mysql::Field:fieldname&gt;"
</p>
</dl>

<h2>Mysql::Stmt class</h2>
<p>
  Example:
</p>
<pre class="code">

my = Mysql.new(hostname, username, password, databasename) st = my.prepare("insert into tblname (col1,col2,col3) values (?,?,?)") st.execute("abc",123,Time.now) st.prepare("select col1,col2,col3 from tblname") st.execute st.fetch # => ["abc", 123, #<Mysql::Time:2005-07-24 23:52:55>] st.close

<h3>OBJECT METHODS</h3>
<dl>
  <dt>affected_rows()
  <dd>
<p>
</p>

  <dt>bind_result(class, ...)
  <dd>
    <p>
    </p>

  <dt>close()
  <dd>
<p>
</p>

  <dt>data_seek(offset)
  <dd>
<p>
</p>

  <dt>execute(arg, ...)
  <dd>
<p>
</p>

  <dt>fetch()
  <dd>
<p>
</p>
<p>
  Type mapping:
</p>
<table>
    <tr><th>MySQL type<th>Ruby class
    <tr><td>TINYINT, SMALLINT, MEDIUMINT, YEAR<td>Fixnum
    <tr><td>INT, BIGINT<td>Fixnum or Bignum
    <tr><td>FLOAT, DOUBLE<td>Float
    <tr><td>DECIMAL<td>String
    <tr><td>DATE, DATETIME, TIMESTAMP, TIME<td>Mysql::Time
    <tr><td>CHAR, VARCHAR, BINARY, VARBINARY, TINYBLOB, TINYTEXT, TINYBLOB, TINYTEXT, MEDIUMBLOB, MEDIUMTEXT, LONGBLOB, LONGTEXT, ENUM, SET, BIT<td>String
    <tr><td>NULL<td>NilClass
</table>

  <dt>field_count()
  <dd>
<p>
</p>

  <dt>free_result()
  <dd>
<p>
</p>

  <dt>insert_id()
  <dd>
<p>
</p>

  <dt>num_rows()
  <dd>
<p>
</p>

  <dt>param_count()
  <dd>
<p>
</p>

  <dt>prepare(q)
  <dd>
<p>
</p>

  <dt>result_metadata()
  <dd>
<p>
</p>

  <dt>row_seek(offset)
  <dd>
<p>
</p>

  <dt>row_tell()
  <dd>
<p>
</p>

  <dt>sqlstate()
  <dd>
<p>
</p>
</dl>

<h3>ITERATOR</h3>
<dl>
  <dt>each() {|x| ...}
  <dd>
<p>
</p>
</dl>

<h2>Mysql::Time class</h2>
<p>
</p>

<h3>CLASS METHODS</h3>
<dl>
  <dt>new(year=0,month=0,day=0,hour=0,minute=0,second=0,neg=false,second_part=0)
  <dd>
<p>
</p>
</dl>

<h3>OBJECT VARIABLES</h3>
<dl>
  <dt>year
  <dd>

  <dt>month
  <dd>

  <dt>day
  <dd>

  <dt>hour
  <dd>

  <dt>minute
  <dd>

  <dt>second
  <dd>

  <dt>neg
  <dd>

  <dt>second_part
  <dd>
</dl>

<h2>Mysql::Error class</h2>

<h3>OBJECT VARIABLES(read only)</h3>
<dl>
  <dt>error
  <dd>eror message
  <dt>errno
  <dd>error number
</dl>

<h2>History</h2>
<dl>
  <dt>2008-09-29
  <dd>
    version 2.8<br>
    version 2.7.7
    <ul>
      <li>When connecting to MySQL, EINTR is occurred sometimes ([ruby-dev:31842])
      <li>MySQL/Ruby 2.7.* can not be compiled on Ruby 1.8.5.
    </ul>

  <dt>2008-06-20
  <dd>
    version 2.8pre4<br>
    <ul>
      <li>[ruby-dev:35152]
    </ul>

  <dt>2008-06-17
  <dd>
    version 2.8pre3<br>
    version 2.7.6
    <ul>
      <li>On 64bit machine, Mysql::Stmt#execute raise error on large numeric value(>= 2**30).
    </ul>

  <dt>2008-03-08
  <dd>
    version 2.8pre2<br>
    version 2.7.5
    <ul>
      <li>On 64bit machine, Mysql::Stmt#fetch return invalid numeric value.
    </ul>

  <dt>2007-12-26
  <dd>
    version 2.8pre1
    <ul>
      <li>for Ruby 1.9.0
      <li>Incompat: Mysql::Result#each_hash don't create column name string each row. it's shared.
      <li>Incompat: Mysql#query with block no longer turn on multi-statements mode automatically.
    </ul>

  <dt>2007-08-22
  <dd>
    version 2.7.4
    <ul>
      <li>BUG: Mysql::Stmt#execute memory leak.
    </ul>

  <dt>2006-12-20
  <dd>
    version 2.7.3
    <ul>
      <li>BUG: Mysql#query with block is stopped when last query failed.
    </ul>

  <dt>2006-10-28
  <dd>
    version 2.7.2
    <ul>
      <li>BUG: Mysql::Stmt#result_metadata don't return nil. (Thanks to Hidetoshi)
      <li>BUG: Mysql#close check mysql_errno.
      <li>BUG: multistatement Mysql#query with block ignore error.
      <li>extconf.rb for Visual C++. (Thanks to Shugo Maeda)
      <li>support MySQL BIT type.
      <li>add Mysql::Field::TYPE_BIT, TYPE_NEWDECIMAL.
    </ul>

  <dt>2006-06-04
  <dd>
    version  2.7.1
    <ul>
      <li>change free() to xfree(). To avoid crash on Windows. (Thanks Tobias Grimm)
    </ul>

  <dt>2005-08-22
  <dd>
    version 2.7
    <ul>
      <li>add constants for Mysql#options: Mysql::OPT_GUESS_CONNECTION, Mysql::OPT_USE_EMBEDDED_CONNECTION, Mysql::OPT_USE_REMOTE_CONNECTION, Mysql::SET_CLIENT_IP
      <li>test.rb: for 4.0.x, 5.0.x
    </ul>

  <dt>2005-08-16
  <dd>
    version 2.7-beta3
    <ul>
      <li>add Mysql::Stmt#bind_result
    </ul>

  <dt>2005-08-02
  <dd>
version 2.7-beta2
<ul>
  <li>BUG: mysql.c.in: fetch_hash: nil value doesn't exist in hash. (Thanks Stefan Kaes)
  <li>add constant Mysql::VERSION.
  <li>add Mysql#prepare
</ul>

  <dt>2005-07-24
  <dd>
version 2.7-beta
<ul>
  <li>add Mysql#stmt_init method
  <li>add Mysql::Stmt, Mysql::Time, Mysql::RowOffset class
  <li>add Mysql::Error#sqlstate method
  <li>change offset value to Mysql::RowOffset object that is used by Mysql::Result#row_seek,row_tell
</ul>

  <dt>2005-07-31
  <dd>
version 2.6.3
<ul>
  <li>add constant Mysql::VERSION.
</ul>

  <dt>2005-07-26
  <dd>
version 2.6.2
<ul>
  <li>BUG: mysql.c.in: fetch_hash: nil value doesn't exist in hash. (Thanks Stefan Kaes)
</ul>

  <dt>2005-06-28
  <dd>
version 2.6.1
<ul>
  <li>mysql.c.in: fix to compile error on MacOSX.
</ul>

  <dt>2005-04-25
  <dd>
version 2.6
<ul>
  <li>add constants for Mysql#option():
    Mysql::OPT_PROTOCOL, Mysql::OPT_READ_TIMEOUT,
    Mysql::OPT_WRITE_TIMEOUT, Mysql::SET_CHARSET_DIR,
    Mysql::SET_CHARSET_NAME, Mysql::SHARED_MEMORY_BASE_NAME,
    Mysql::SECURE_AUTH
  <li>add methods: Mysql#more_results?(), Mysql#next_result(), 
    Mysql#set_server_option(), Mysql#sqlstate()
  <li>add constants for Mysql#connect():
    Mysql::CLIENT_MULTI_STATEMENTS, Mysql::CLIENT_MULTI_RESULTS
  <li>add constants for Mysql#set_server_option():
    Mysql::OPTION_MULTI_STATEMENTS_ON,
    Mysql::OPTION_MULTI_STATEMENTS_OFF
  <li>add Mysql#query() with block
  <li>add Mysql#reconnect(), Mysql#reconnect=()
  <li>When connection was closed, it don't try to reconnect by default.
</ul>

  <dt>2005-02-12
  <dd>
version 2.5.2
<ul>
  <li>BUG: Mysql#connect make object to not close. (Thanks Andres Salomon)
</ul>

  <dt>2004-09-20
  <dd>
version 2.5.1
<ul>
  <li>add Mysql#set_ssl().
</ul>

  <dt>2004-08-31
  <dd>
version 2.5
<ul>
  <li>correspond to MySQL 4.1.x.
  <li>change MysqlRes, MysqlField, MysqlError to Mysql::Result, Mysql::Field, Mysql::Error.
  <li>add Mysql.client_version(), Mysql.get_client_version(),
    Mysql#client_version(), Mysql#get_client_version(),
    Mysql#server_version(), Mysql#get_server_version(),
    Mysql#warning_count(), Mysql#commit(), Mysql#rollback(),
    Mysql#autocommit().
  <li>add Mysql::Field#is_not_null?(), Mysql::Field#is_pri_key?(),
    Mysql::Field#is_num?().
  <li>add MysqlField::TYPE_VAR_STRING.
</ul>

  <dt>2003-08-10
  <dd>
version 2.4.5
<ul>
  <li>extconf.rb: correspond to MySQL 4.1.
  <li>mysql.c.in: correspond to Ruby 1.8.
</ul>

  <dt>2003-02-23
  <dd>
version 2.4.4a
<ul>
  <li>make extconf.rb to correspond to Ruby 1.8.0
</ul>

  <dt>2003-01-29
  <dd>
version 2.4.4
<ul>
  <li>add Mysql::OPT_LOCAL_INFILE.
  <li>add --with-mysql-config option to extconf.rb.
  <li>extconf.rb automatically detect typical library.
</ul>

  <dt>2003-01-05
  <dd>
version 2.4.3c
<ul>
  <li>modified English README. Thanks to Paul DuBois.
</ul>

  <dt>2002-12-24
  <dd>
version 2.4.3b
<ul>
  <li>make extconf.rb to correspond to Ruby 1.6.8.
</ul>

  <dt>2002-11-07
  <dd>
version 2.4.3a
<ul>
  <li>fix bug duplicating constant.
</ul>

  <dt>2002-09-10
  <dd>
version 2.4.3
<ul>
  <li>for error number with prefix ER_ .
  <li>get error constant from errmsg.h and mysqld_error.h automatically.
</ul>

  <dt>2002-01-07
  <dd>
version 2.4.2
<ul>
  <li>for MySQL 4.0.
  <li>change `uint' to `unsigned int' (for mswin).
</ul>

  <dt>2001-12-02
  <dd>
version 2.4.1
<ul>
  <li>remove `extern' (for Cygiwn).
  <li>change option of extconf.rb.
</ul>

  <dt>2001-10-12
  <dd>
version 2.4.0
<ul>
  <li>for Ruby 1.7.
  <li>add Mysql::debug(), Mysql#change_user(), Mysql#character_set_name(), Mysql#dump_debug_info().
</ul>
</dl>

<h2>Author</h2>
<p>
  e-mail: TOMITA Masahiro <a href="mailto:tommy@tmtm.org">tommy@tmtm.org</a>
  <a href="http://tmtm.org">http://tmtm.org</a>
</p>
<hr>
<address><a href="mailto:tommy@tmtm.org">TOMITA Masahiro</a></address>

Last modified: Tue Sep 30 00:01:12 JST 2008

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