Mysql应用mysqldump数据库备份参数详解

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MYSQL数据库mysqldump备份：

MYSQL数据库mysqldump还原：

MYSQL数据库mysqldump按条件导出：

MYSQL数据库mysqldump按条件导入：

MYSQL数据库案例：

MYSQL数据库mysqldump导出表：

MYSQL数据库案例：mysqldump -uroot -p sqlhk9 a Cno-data

MYSQL数据库参数详解：

MYSQL数据库使用mysqldump
mysqldump -u root -p your-new-password databasename [tablename] > db.sql

MYSQL数据库比较大的表需要用优化的dump以节省内存：
mysqldump --opt database > backup-file.sql

MYSQL数据库mysqldump工具有大量的选项,部分选项如下表：

MYSQL数据库　　选项/Option 作用/Action Performed

MYSQL数据库　　--add-drop-table

MYSQL数据库　　这个选项将会在每一个表的前面加上DROP TABLE IF EXISTS语句,这样可以保证导回MySQL数据库的时候不会出错,因为每次导回的时候,都会首先检查表是否存在,存在就删除

MYSQL数据库　　--add-locks

MYSQL数据库　　这个选项会在INSERT语句中捆上一个LOCK TABLE和UNLOCK TABLE语句.这就防止在这些记录被再次导入数据库时其他用户对表进行的操作
　　
　　-c or - complete_insert

MYSQL数据库　　这个选项使得mysqldump命令给每一个产生INSERT语句加上列(field)的名字.当把数据导出导另外一个数据库时这个选项很有用.

MYSQL数据库　　--delayed-insert 在INSERT命令中加入DELAY选项

MYSQL数据库　　-F or -flush-logs 使用这个选项,在执行导出之前将会刷新MySQL服务器的log.

MYSQL数据库　　-f or -force 使用这个选项,即使有错误发生,仍然继续导出

MYSQL数据库　　--full 这个选项把附加信息也加到CREATE TABLE的语句中

MYSQL数据库　　-l or -lock-tables 使用这个选项,导出表的时候服务器将会给表加锁.

MYSQL数据库　　-t or -no-create- info

MYSQL数据库　　这个选项使的mysqldump命令不创建CREATE TABLE语句,这个选项在您只需要数据而不需要DDL(数据库定义语句)时很方便.
　　
　　-d or -no-data 这个选项使的mysqldump命令不创建INSERT语句.

MYSQL数据库
在您只需要DDL语句时,可以使用这个选项.

MYSQL数据库　　--opt 此选项将打开所有会提高文件导出速度和创造一个可以更快导入的文件的选项.

MYSQL数据库　　-q or -quick 这个选项使得MySQL不会把整个导出的内容读入内存再执行导出,而是在读到的时候就写入导文件中.

MYSQL数据库　　-T path or -tab = path 这个选项将会创建两个文件,一个文件包含DDL语句或者表创建语句,另一个文件包含数据.DDL文件被命名为table_name.sql,数据文件被命名为table_name.txt.路径名是存放这两个文件的目录.目录必须已经存在,并且命令的使用者有对文件的特权.
　　
　　-w "WHERE Clause" or -where = "Where clause "

MYSQL数据库参考国外网站

MYSQL数据库
NAME
?????? mysqldump - a database backup program

MYSQL数据库
SYNOPSIS
?????? mysqldump [options] [db_name [tbl_name ...]]

MYSQL数据库
DESCRIPTION
?????? The mysqldump client can be used to dump a database or a collection of
?????? databases for backup or for transferring the data to another SQL server
?????? (not necessarily a MySQL server). The dump contains SQL statements to
?????? create the table and/or populate the table.

MYSQL数据库?????? If you are doing a backup on the server,and your tables all are MyISAM
?????? tables,you could consider using the mysqlhotcopy instead since faster
?????? backups and faster restores can be accomplished with the latter. See
?????? mysqlhotcopy(1).

MYSQL数据库?????? There are three general ways to invoke mysqldump:

MYSQL数据库?????? shell> mysqldump [options] db_name [tables]
?????? shell> mysqldump [options] --databases DB1 [DB2 DB3...]
?????? shell> mysqldump [options] --all-databases

MYSQL数据库?????? If you do not name any tables or use the --databases or --all-databases
?????? option,entire databases are dumped.

MYSQL数据库?????? To get a list of the options your version of mysqldump supports,
?????? execute mysqldump --help.

MYSQL数据库?????? If you run mysqldump without the --quick or --opt option,mysqldump
?????? loads the whole result set into memory before dumping the result. This
?????? probably is a problem if you are dumping a big database. As of MySQL
?????? 4.1,--opt is enabled by default,but can be disabled with --skip-opt.

MYSQL数据库?????? If you are using a recent copy of the mysqldump program to generate a
?????? dump to be reloaded into a very old MySQL server,you should not use
?????? the --opt or -e options.

MYSQL数据库?????? Before MySQL 4.1.2,out-of-range numeric values such as -inf and inf,
?????? as well as NaN (not-a-number) values are dumped by mysqldump as NULL.
?????? You can see this using the following sample table:

MYSQL数据库?????? mysql> CREATE TABLE t (f DOUBLE);
?????? mysql> INSERT INTO t VALUES(1e+222222222222222222221);
?????? mysql> INSERT INTO t VALUES(-1e222222222222222222221);
?????? mysql> SELECT f FROM t;
?????? +------+
?????? | f??? |
?????? +------+
?????? |? inf |
?????? | -inf |
?????? +------+

MYSQL数据库?????? For this table,mysqldump produces the following data output:

MYSQL数据库?????? --
?????? -- Dumping data for table ‘t‘
?????? --
?????? INSERT INTO t VALUES (NULL);
?????? INSERT INTO t VALUES (NULL);

MYSQL数据库?????? The significance of this behavior is that if you dump and restore the
?????? table,the new table has contents that differ from the original
?????? contents. This problem is fixed as of MySQL 4.1.2; you cannot insert
?????? inf in the table,so this mysqldump behavior is only relevant when you
?????? deal with old servers.

MYSQL数据库?????? mysqldump supports the following options:

MYSQL数据库?????? ?? --help,-?

MYSQL数据库????????? Display a help message and exit.

MYSQL数据库?????? ?? --add-drop-database

MYSQL数据库????????? Add a DROP DATABASE statement before each CREATE DATABASE statement.
????????? Added in MySQL 4.1.13.

MYSQL数据库?????? ?? --add-drop-table

MYSQL数据库????????? Add a DROP TABLE statement before each CREATE TABLE statement.

MYSQL数据库?????? ?? --add-locks

MYSQL数据库????????? Surround each table dump with LOCK TABLES and UNLOCK TABLES
????????? statements. This results in faster inserts when the dump file is
????????? reloaded. See Section 2.13,“Speed of INSERT Statements”.

MYSQL数据库?????? ?? --all-databases,-A

MYSQL数据库????????? Dump all tables in all databases. This is the same as using the
????????? --databases option and naming all the databases on the command line.

MYSQL数据库?????? ?? --allow-keywords

MYSQL数据库????????? Allow creation of column names that are keywords. This works by
????????? prefixing each column name with the table name.

MYSQL数据库?????? ?? --comments[={0|1}]

MYSQL数据库????????? If set to 0,suppresses additional information in the dump file such
????????? as program version,server version,and host.? --skip-comments has
????????? the same effect as --comments=0. The default value is 1,which
????????? includes the extra information. Added in MySQL 4.0.17.

MYSQL数据库?????? ?? --compact

MYSQL数据库????????? Produce less verbose output. This option suppresses comments and
????????? enables the --skip-add-drop-table,--no-set-names,
????????? --skip-disable-keys,and --skip-add-locks options. Added in MySQL
????????? 4.1.2.

MYSQL数据库?????? ?? --compatible=name

MYSQL数据库????????? Produce output that is more compatible with other database systems
????????? or with older MySQL servers. The value of name can be ansi,
????????? mysql323,mysql40,postgresql,oracle,mssql,db2,maxdb,
????????? no_key_options,no_table_options,or no_field_options. To use
????????? several values,separate them by commas. These values have the same
????????? meaning as the corresponding options for setting the server SQL
????????? mode. See the section called “THE SERVER SQL MODE”.

MYSQL数据库????????? This option does not guarantee compatibility with other servers. It
????????? only enables those SQL mode values that are currently available for
????????? making dump output more compatible. For example,--compatible=oracle
????????? does not map data types to Oracle types or use Oracle comment
????????? syntax.

MYSQL数据库????????? This option requires a server version of 4.1.0 or higher. With older
????????? servers,it does nothing.

MYSQL数据库?????? ?? --complete-insert,-c

MYSQL数据库????????? Use complete INSERT statements that include column names.

MYSQL数据库?????? ?? --compress,-C

MYSQL数据库????????? Compress all information sent between the client and the server if
????????? both support compression.

MYSQL数据库?????? ?? --create-options

MYSQL数据库????????? Include all MySQL-specific table options in the CREATE TABLE
????????? statements. Before MySQL 4.1.2,use --all instead.

MYSQL数据库?????? ?? --databases,-B

MYSQL数据库????????? Dump several databases. Normally,mysqldump treats the first name
????????? argument on the command line as a database name and following names
????????? as table names. With this option,it treats all name arguments as
????????? database names.? CREATE DATABASE IF NOT EXISTS db_name and USE
????????? db_name statements are included in the output before each new
????????? database.

MYSQL数据库?????? ?? --debug[=debug_options],-# [debug_options]

MYSQL数据库????????? Write a debugging log. The debug_options string is often
????????? ′d:t:o,file_name'.

MYSQL数据库?????? ?? --default-character-set=charset

MYSQL数据库????????? Use charset as the default character set. See Section 7.1,“The
????????? Character Set Used for Data and Sorting”. If not specified,
????????? mysqldump from MySQL 4.1.2 or later uses utf8,and earlier versions
????????? use latin1.

MYSQL数据库?????? ?? --delayed-insert

MYSQL数据库????????? Insert rows using INSERT DELAYED statements.

MYSQL数据库?????? ?? --delete-master-logs

MYSQL数据库????????? On a master replication server,delete the binary logs after
????????? performing the dump operation. This option automatically enables
????????? --first-slave before MySQL 4.1.8 and enables --master-data
????????? thereafter. It was added in MySQL 3.23.57 (for MySQL 3.23) and MySQL
????????? 4.0.13 (for MySQL 4.0).

MYSQL数据库?????? ?? --disable-keys,-K

MYSQL数据库????????? For each table,surround the INSERT statements with /*!40000 ALTER
????????? TABLE tbl_name DISABLE KEYS */; and /*!40000 ALTER TABLE tbl_name
????????? ENABLE KEYS */; statements. This makes loading the dump file into a
????????? MySQL 4.0 or newer server faster because the indexes are created
????????? after all rows are inserted. This option is effective for MyISAM
????????? tables only.

MYSQL数据库?????? ?? --extended-insert,-e

MYSQL数据库????????? Use multiple-row INSERT syntax that include several VALUES lists.
????????? This results in a smaller dump file and speeds up inserts when the
????????? file is reloaded.

MYSQL数据库?????? ?? --fields-terminated-by=...,--fields-enclosed-by=...,
????????? --fields-optionally-enclosed-by=...,--fields-escaped-by=...,
????????? --lines-terminated-by=...

MYSQL数据库????????? These options are used with the -T option and have the same meaning
????????? as the corresponding clauses for LOAD DATA INFILE. See Section 2.5,
????????? “LOAD DATA INFILE Syntax”.

MYSQL数据库?????? ?? --first-slave,-x

MYSQL数据库????????? Deprecated,renamed to --lock-all-tables in MySQL 4.1.8.

MYSQL数据库?????? ?? --flush-logs,-F

MYSQL数据库????????? Flush the MySQL server log files before starting the dump. This
????????? option requires the RELOAD privilege. Note that if you use this
????????? option in combination with the --all-databases (or -A) option,the
????????? logs are flushed for each database dumped. The exception is when
????????? using --lock-all-tables or --master-data: In this case,the logs are
????????? flushed only once,corresponding to the moment that all tables are
????????? locked. If you want your dump and the log flush to happen at exactly
????????? the same moment,you should use --flush-logs together with either
????????? --lock-all-tables or --master-data.

MYSQL数据库?????? ?? --force,-f

MYSQL数据库????????? Continue even if an SQL error occurs during a table dump.

MYSQL数据库?????? ?? --host=host_name,-h host_name

MYSQL数据库????????? Dump data from the MySQL server on the given host. The default host
????????? is localhost.

MYSQL数据库?????? ?? --hex-blob

MYSQL数据库????????? Dump binary string columns using hexadecimal notation (for example,
????????? ′abc' becomes 0x616263). The affected columns are BINARY,VARBINARY,
????????? and BLOB in MySQL 4.1 and up,and CHAR BINARY,VARCHAR BINARY,and
????????? BLOB in MySQL 4.0. This option was added in MySQL 4.0.23 and 4.1.8.

MYSQL数据库?????? ?? --lock-all-tables,-x

MYSQL数据库????????? Lock all tables across all databases. This is achieved by acquiring
????????? a global read lock for the duration of the whole dump. This option
????????? automatically turns off --single-transaction and --lock-tables.
????????? Added in MySQL 4.1.8.

MYSQL数据库?????? ?? --lock-tables,-l

MYSQL数据库????????? Lock all tables before starting the dump. The tables are locked with
????????? READ LOCAL to allow concurrent inserts in the case of MyISAM tables.
????????? For transactional tables such as InnoDB and BDB,
????????? --single-transaction is a much better option,because it does not
????????? need to lock the tables at all.

MYSQL数据库????????? Please note that when dumping multiple databases,--lock-tables
????????? locks tables for each database separately. So,this option does not
????????? guarantee that the tables in the dump file are logically consistent
????????? between databases. Tables in different databases may be dumped in
????????? completely different states.

MYSQL数据库?????? ?? --master-data[=value]

MYSQL数据库????????? This option causes the binary log position and filename to be
????????? written to the output. This option requires the RELOAD privilege and
????????? the binary log must be enabled. If the option value is equal to 1,
????????? the position and filename are written to the dump output in the form
????????? of a CHANGE MASTER statement that makes a slave server start from
????????? the correct position in the master's binary logs if you use this SQL
????????? dump of the master to set up a slave. If the option value is equal
????????? to 2,the CHANGE MASTER statement is written as an SQL comment. This
????????? is the default action if value is omitted.? value may be given as of
????????? MySQL 4.1.8; before that,do not specify an option value.

MYSQL数据库????????? The --master-data option turns on --lock-all-tables,unless
????????? --single-transaction also is specified (in which case,a global read
????????? lock is only acquired a short time at the beginning of the dump. See
????????? also the description for --single-transaction. In all cases,any
????????? action on logs happens at the exact moment of the dump. This option
????????? automatically turns off --lock-tables.

MYSQL数据库?????? ?? --no-create-db,-n

MYSQL数据库????????? This option suppresses the CREATE DATABASE /*!32312 IF NOT EXISTS*/
????????? db_name statements that are otherwise included in the output if the
????????? --databases or --all-databases option is given.

MYSQL数据库?????? ?? --no-create-info,-t

MYSQL数据库????????? Do not write CREATE TABLE statements that re-create each dumped
????????? table.

MYSQL数据库?????? ?? --no-data,-d

MYSQL数据库????????? Do not write any row information for the table. This is very useful
????????? if you want to get a dump of only the structure for a table.

MYSQL数据库?????? ?? --opt

MYSQL数据库????????? This option is shorthand; it is the same as specifying
????????? --add-drop-table --add-locks --create-options --disable-keys
????????? --extended-insert --lock-tables --quick --set-charset. It should
????????? give you a fast dump operation and produce a dump file that can be
????????? reloaded into a MySQL server quickly.? As of MySQL 4.1,--opt is on
????????? by default,but can be disabled with --skip-opt. To disable only
????????? certain of the options enabled by --opt,use their --skip forms; for
????????? example,--skip-add-drop-table or --skip-quick.

MYSQL数据库?????? ?? --password[=password],-p[password]

MYSQL数据库????????? The password to use when connecting to the server. If you use the
????????? short option form (-p),you cannot have a space between the option
????????? and the password. If you omit the password value following the
????????? --password or -p option on the command line,you are prompted for
????????? one.

MYSQL数据库?????? ?? --port=port_num,-P port_num

MYSQL数据库????????? The TCP/IP port number to use for the connection.

MYSQL数据库?????? ?? --protocol={TCP | SOCKET | PIPE | MEMORY}

MYSQL数据库????????? The connection protocol to use. Added in MySQL 4.1.

MYSQL数据库?????? ?? --quick,-q

MYSQL数据库????????? This option is useful for dumping large tables. It forces mysqldump
????????? to retrieve rows for a table from the server a row at a time rather
????????? than retrieving the entire row set and buffering it in memory before
????????? writing it out.

MYSQL数据库?????? ?? --quote-names,-Q

MYSQL数据库????????? Quote database,table,and column names within ‘‘' characters. If
????????? the server SQL mode includes the ANSI_QUOTES option,names are
????????? quoted within ‘"' characters. As of MySQL 4.1.1,--quote-names is on
????????? by default. It can be disabled with --skip-quote-names,but this
????????? option should be given after any option such as --compatible that
????????? may enable --quote-names.

MYSQL数据库?????? ?? --result-file=file,-r file

MYSQL数据库????????? Direct output to a given file. This option should be used on
????????? Windows,because it prevents newline ‘n' characters from being
????????? converted to ‘rn' carriage return/newline sequences.

MYSQL数据库?????? ?? --set-charset

MYSQL数据库????????? Add SET NAMES default_character_set to the output. This option is
????????? enabled by default. To suppress the SET NAMES statement,use
????????? --skip-set-charset. This option was added in MySQL 4.1.2.

MYSQL数据库?????? ?? --single-transaction

MYSQL数据库????????? This option issues a BEGIN SQL statement before dumping data from
????????? the server. It is useful only with transactional tables such as
????????? InnoDB and BDB,because then it dumps the consistent state of the
????????? database at the time when BEGIN was issued without blocking any
????????? applications.

MYSQL数据库????????? When using this option,you should keep in mind that only InnoDB
????????? tables are dumped in a consistent state. For example,any MyISAM or
????????? HEAP tables dumped while using this option may still change state.

MYSQL数据库????????? The --single-transaction option was added in MySQL 4.0.2. This
????????? option is mutually exclusive with the --lock-tables option,because
????????? LOCK TABLES causes any pending transactions to be committed
????????? implicitly.

MYSQL数据库????????? To dump big tables,you should combine this option with --quick.

MYSQL数据库?????? ?? --socket=path,-S path

MYSQL数据库????????? The socket file to use when connecting to localhost (which is the
????????? default host).

MYSQL数据库?????? ?? --skip-comments

MYSQL数据库????????? See the description for the --comments option.

MYSQL数据库?????? ?? --tab=path,-T path

MYSQL数据库????????? Produce tab-separated data files. For each dumped table,mysqldump
????????? creates a tbl_name.sql file that contains the CREATE TABLE statement
????????? that creates the table,and a tbl_name.txt file that contains its
????????? data. The option value is the directory in which to write the files.

MYSQL数据库????????? By default,the .txt data files are formatted using tab characters
????????? between column values and a newline at the end of each line. The
????????? format can be specified explicitly using the --fields-xxx and
????????? --lines--xxx options.

MYSQL数据库????????? Note: This option should be used only when mysqldump is run on the
????????? same machine as the mysqld server. You must have the FILE privilege,
????????? and the server must have permission to write files in the directory
????????? that you specify.

MYSQL数据库?????? ?? --tables

MYSQL数据库????????? Override the --databases or -B option. All arguments following the
????????? option are regarded as table names.

MYSQL数据库?????? ?? --user=user_name,-u user_name

MYSQL数据库????????? The MySQL username to use when connecting to the server.

MYSQL数据库?????? ?? --verbose,-v

MYSQL数据库????????? Verbose mode. Print out more information on what the program does.

MYSQL数据库?????? ?? --version,-V

MYSQL数据库????????? Display version information and exit.

MYSQL数据库?????? ?? --where=?????where-condition?????,-w ?????where-condition?????

MYSQL数据库????????? Dump only records php/select">selected by the given WHERE condition. Note that
????????? quotes around the condition are mandatory if it contains spaces or
????????? characters that are special to your command interpreter.

MYSQL数据库????????? Examples:

MYSQL数据库????????? "--where=user='jimf'"
????????? "-wuserid>1"
????????? "-wuserid<1"

MYSQL数据库?????? ?? --xml,-X

MYSQL数据库????????? Write dump output as well-formed XML.

MYSQL数据库?????? You can also set the following variables by using --var_name=value
?????? options:

MYSQL数据库?????? ?? max_allowed_packet

MYSQL数据库????????? The maximum size of the buffer for client/server communication. The
????????? value of the variable can be up to 16MB before MySQL 4.0,and up to
????????? 1GB from MySQL 4.0 on.

MYSQL数据库?????? ?? net_buffer_length

MYSQL数据库????????? The initial size of the buffer for client/server communication. When
????????? creating multiple-row-insert statements (as with option
????????? --extended-insert or --opt),mysqldump creates rows up to
????????? net_buffer_length length. If you increase this variable,you should
????????? also ensure that the net_buffer_length variable in the MySQL server
????????? is at least this large.

MYSQL数据库?????? It is also possible to set variables by using
?????? --set-variable=var_name=value or -O var_name=value syntax. However,
?????? this syntax is deprecated as of MySQL 4.0.

MYSQL数据库?????? The most common use of mysqldump is probably for making a backup of an
?????? entire database:

MYSQL数据库?????? shell> mysqldump --opt db_name > backup-file.sql

MYSQL数据库?????? You can read the dump file back into the server like this:

MYSQL数据库?????? shell> mysql db_name < backup-file.sql

MYSQL数据库?????? Or like this:

MYSQL数据库?????? shell> mysql -e "source /path-to-backup/backup-file.sql" db_name

MYSQL数据库?????? mysqldump is also very useful for populating databases by copying data
?????? from one MySQL server to another:

MYSQL数据库?????? shell> mysqldump --opt db_name | mysql --host=remote_host -C db_name

MYSQL数据库?????? It is possible to dump several databases with one command:

MYSQL数据库?????? shell> mysqldump --databases db_name1 [db_name2 ...] > my_databases.sql

MYSQL数据库?????? If you want to dump all databases,use the --all-databases option:

MYSQL数据库?????? shell> mysqldump --all-databases > all_databases.sql

MYSQL数据库?????? If tables are stored in the InnoDB storage engine,mysqldump provides a
?????? way of making an online backup of these (see command below). This
?????? backup just needs to acquire a global read lock on all tables (using
?????? FLUSH TABLES WITH READ LOCK) at the beginning of the dump. As soon as
?????? this lock has been acquired,the binary log coordinates are read and
?????? lock is released. So if and only if one long updating statement is
?????? running when the FLUSH...? is issued,the MySQL server may get stalled
?????? until that long statement finishes,and then the dump becomes
?????? lock-free. So if the MySQL server receives only short (in the sense of
?????? "short execution time") updating statements,even if there are plenty
?????? of them,the initial lock period should not be noticeable.

MYSQL数据库?????? shell> mysqldump --all-databases --single-transaction > all_databases.sql

MYSQL数据库?????? For point-in-time recovery (also known as “roll-forward”,when you need
?????? to restore an old backup and replay the changes which happened since
?????? that backup),it is often useful to rotate the binary log (see
?????? Section 8.4,“The Binary Log”) or at least know the binary log
?????? coordinates to which the dump corresponds:

MYSQL数据库?????? shell> mysqldump --all-databases --master-data=2 > all_databases.sql
?????? or
?????? shell> mysqldump --all-databases --flush-logs --master-data=2 > all_databases.sql

MYSQL数据库?????? The simultaneous use of --master-data and --single-transaction works as
?????? of MySQL 4.1.8. It provides a convenient way to make an online backup
?????? suitable for point-in-time recovery if tables are stored in the InnoDB
?????? storage engine.

MYSQL数据库?????? For more information on making backups,see Section 6.1,“Database
?????? Backups”.

MYSQL数据库
SEE ALSO
?????? isamchk(1),isamlog(1),msql2mysql(1),myisamchk(1),myisamlog(1),
?????? myisampack(1),mysql(1),mysql.server(1),mysql_config(1),
?????? mysql_fix_privilege_tables(1),mysql_zap(1),mysqlaccess(1),
?????? mysqladmin(1),mysqlbinlog(1),mysqlcheck(1),mysqld(1),
?????? mysqld_multi(1),mysqld_safe(1),mysqlhotcopy(1),mysqlimport(1),
?????? mysqlshow(1),pack_isam(1),perror(1),replace(1),safe_mysqld(1)

MYSQL数据库?????? For more information,please refer to the MySQL Reference Manual,which
?????? may already be installed locally and which is also available online at
?????? http://dev.mysql.com/doc/.

MYSQL数据库
AUTHOR
?????? MySQL AB (http://www.mysql.com/).? This software comes with no
?????? warranty.

（编辑：李大同）

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