mysqlfrm可基于frm文件生成对应的表结构。常用于数据恢复场景。

其有两种操作模式。

1. 创建一个临时实例来解析frm文件。

2. 使用诊断模式解析frm文件。

以下表进行测试，看看，

1.  mysqlfrm解析的结果与原生表结构的区别。

2.  两种操作模式解析结果的不同。

mysql> show create table t_child\G

*************************** 1. row ***************************

       Table: t_child

Create Table: CREATE TABLE `t_child` (

  `child_id` int(11) NOT NULL AUTO_INCREMENT,

  `parent_id` int(11) DEFAULT NULL,

  PRIMARY KEY (`child_id`),

  KEY `parent_id` (`parent_id`),

  CONSTRAINT `t_child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `t_parent` (`parent_id`)

) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1

1 row in set (0.00 sec)

首先看看第一种操作模式。

既然是创建临时实例，肯定需要知道软件所在的位置，有两种方式。

1. 指定--basedir

$ mysqlfrm --basedir=/usr/local/mysql7 /tmp/t_child.frm --port=3333

# Starting the spawned server on port 3333 ... done.

# Reading .frm files

#

# Reading the t_child.frm file.

#

# CREATE statement for /tmp/t_child.frm:

#

CREATE TABLE `tmp`.`t_child` (

  `child_id` int(11) NOT NULL AUTO_INCREMENT,

  `parent_id` int(11) DEFAULT NULL,

  PRIMARY KEY (`child_id`),

  KEY `parent_id` (`parent_id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1

#...done.

2. 指定--server

$ mysqlfrm --server=root:123456@127.0.0.1:3307 /tmp/t_child.frm  --port=2323

WARNING: Using a password on the command line interface can be insecure.

# Source on 127.0.0.1: ... connected.

# Starting the spawned server on port 2323 ... done.

# Reading .frm files

#

# Reading the t_child.frm file.

#

# CREATE statement for /tmp/t_child.frm:

#

CREATE TABLE `tmp`.`t_child` (

  `child_id` int(11) NOT NULL AUTO_INCREMENT,

  `parent_id` int(11) DEFAULT NULL,

  PRIMARY KEY (`child_id`),

  KEY `parent_id` (`parent_id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1

#...done.

注意，指定--server和--basedir没有多大区别，主要也是为了获取basedir。

从上面的输出可以看到，相对于其原生表结构，打印出的表结构，

1. 没有自增主键的序列信息。

2. 没有外键约束。

再来看看通过诊断模式解析的结果。

$ mysqlfrm --diagnostic /tmp/t_child.frm

# WARNING: Cannot generate character set or collation names without the --server option.

# CAUTION: The diagnostic mode is a best-effort parse of the .frm file. As such, it may not identify all of the components of the table correctly. This is es

pecially true for damaged files. It will also not read the default values for the columns and the resulting statement may not be syntactically correct.# Reading .frm file for /tmp/t_child.frm:

# The .frm file is a TABLE.

# CREATE TABLE Statement:

CREATE TABLE `tmp`.`t_child` (

  `child_id` int(11) NOT NULL AUTO_INCREMENT,

  `parent_id` int(11) DEFAULT NULL,

PRIMARY KEY `PRIMARY` (`child_id`),

KEY `parent_id` (`parent_id`)

) ENGINE=InnoDB;

#...done.

相对于通过临时实例来解析frm文件，通过诊断模式解析的结果没有字符集。

其它选项

--show-stats：打印frm文件信息

$ mysqlfrm --diagnostic /tmp/t_child.frm --show-stats

# WARNING: Cannot generate character set or collation names without the --server option.

# CAUTION: The diagnostic mode is a best-effort parse of the .frm file. As such, it may not identify all of the components of the table correctly. This is especially true for damaged files.

 It will also not read the default values for the columns and the resulting statement may not be syntactically correct.# Reading .frm file for /tmp/t_child.frm:

# The .frm file is a TABLE.

# CREATE TABLE Statement:

CREATE TABLE `tmp`.`t_child` (

  `child_id` int(11) NOT NULL AUTO_INCREMENT,

  `parent_id` int(11) DEFAULT NULL,

PRIMARY KEY `PRIMARY` (`child_id`),

KEY `parent_id` (`parent_id`)

) ENGINE=InnoDB;

# File Statistics:

#         Last Modified : Thu Jul 12 23:36:12 2018

#         Creation Time : Thu Jul 12 23:36:25 2018

#         Last Accessed : Thu Jul 12 23:36:42 2018

#                  Mode : 33188

#                  Size : 8608

# Table Statistics:

#                Engine : INNODB

#           frm Version : 9

#         MySQL Version : 5.7.22

#      frm File_Version : 5

#               IO_SIZE : 4096

#  Def Partition Engine : None

#...done.

注意：

如果使用方式1解析frm文件出现问题，可打开debug模式，如，

$ mysqlfrm --server=root:123456@127.0.0.1:3307 /tmp/t_child.frm --port=2323 -vvv

WARNING: Using a password on the command line interface can be insecure.

# Source on 127.0.0.1: ... connected.

# Checking read access to .frm files

# Creating a temporary datadir = /tmp/tmpA4tVug

# Starting the spawned server on port 2323 ...

# Cloning the MySQL server located at /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64.

# Configuring new instance...

# Locating mysql tools...

# Location of files:

#                       mysqld: /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64/bin/mysqld

#                   mysqladmin: /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64/bin/mysqladmin

# Setting up empty database and mysql tables...

2018-07-13T00:36:29.211443Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2018-07-13T00:36:30.209454Z 0 [Warning] InnoDB: New log files created, LSN=45790

2018-07-13T00:36:30.335785Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.

2018-07-13T00:36:30.441182Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: c90ecb11-8634-11e

8-a908-00163e0cf2bb.2018-07-13T00:36:30.443663Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.

2018-07-13T00:36:30.444160Z 1 [Warning] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.

# Starting new instance of the server...

# Startup command for new server:

/usr/local/mysql-5.7.22-linux-glibc2.12-x86_64/bin/mysqld --no-defaults --basedir=/usr/local/mysql-5.7.22-linux-glibc2.12-x86_64 --datadir=/tmp/tmpA4tVug --pid-file=/tmp/tmpA4tVug/clone.pid

 --port=2323 --server-id=101 --socket=/tmp/tmpA4tVug/mysql.sock --tmpdir=/tmp/tmpA4tVug# Testing connection to new instance...

2018-07-13T00:36:33.643490Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2018-07-13T00:36:33.643662Z 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled

2018-07-13T00:36:33.643709Z 0 [Note] /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64/bin/mysqld (mysqld 5.7.22) starting as process 18776 ...

2018-07-13T00:36:33.650009Z 0 [Note] InnoDB: PUNCH HOLE support available

2018-07-13T00:36:33.650037Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2018-07-13T00:36:33.650042Z 0 [Note] InnoDB: Uses event mutexes

2018-07-13T00:36:33.650046Z 0 [Note] InnoDB: GCC builtin __sync_synchronize() is used for memory barrier

2018-07-13T00:36:33.650050Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.3

2018-07-13T00:36:33.650054Z 0 [Note] InnoDB: Using Linux native AIO

2018-07-13T00:36:33.650346Z 0 [Note] InnoDB: Number of pools: 1

2018-07-13T00:36:33.650451Z 0 [Note] InnoDB: Using CPU crc32 instructions

2018-07-13T00:36:33.652049Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M

2018-07-13T00:36:33.676202Z 0 [Note] InnoDB: Completed initialization of buffer pool

2018-07-13T00:36:33.679296Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().

2018-07-13T00:36:33.690571Z 0 [Note] InnoDB: Highest supported file format is Barracuda.

2018-07-13T00:36:33.722958Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables

2018-07-13T00:36:33.723014Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...

2018-07-13T00:36:33.862563Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.

2018-07-13T00:36:33.863553Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.

2018-07-13T00:36:33.863565Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.

2018-07-13T00:36:33.863831Z 0 [Note] InnoDB: Waiting for purge to start

2018-07-13T00:36:33.914001Z 0 [Note] InnoDB: 5.7.22 started; log sequence number 2589156

2018-07-13T00:36:33.914376Z 0 [Note] Plugin 'FEDERATED' is disabled.

2018-07-13T00:36:33.920024Z 0 [Warning] Failed to set up SSL because of the following SSL library error: SSL context is not usable without certificate and private key

2018-07-13T00:36:33.920043Z 0 [Note] Server hostname (bind-address): '*'; port: 2323

2018-07-13T00:36:33.920081Z 0 [Note] IPv6 is available.

2018-07-13T00:36:33.920088Z 0 [Note]   - '::' resolves to '::';

2018-07-13T00:36:33.920106Z 0 [Note] Server socket created on IP: '::'.

2018-07-13T00:36:33.920400Z 0 [Note] InnoDB: Loading buffer pool(s) from /tmp/tmpA4tVug/ib_buffer_pool

2018-07-13T00:36:33.922124Z 0 [Note] InnoDB: Buffer pool(s) load completed at 180713  8:36:33

2018-07-13T00:36:33.923975Z 0 [Warning] Insecure configuration for --pid-file: Location '/tmp' in the path is accessible to all OS users. Consider choosing a different directory.

2018-07-13T00:36:33.931917Z 0 [Note] Event Scheduler: Loaded 0 events

2018-07-13T00:36:33.932165Z 0 [Note] /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64/bin/mysqld: ready for connections.

Version: '5.7.22'  socket: '/tmp/tmpA4tVug/mysql.sock'  port: 2323  MySQL Community Server (GPL)

# trying again...

# Success!

# Setting the root password...

mysqladmin: [Warning] Using a password on the command line interface can be insecure.

Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.

# Connection Information:

#  -uroot -proot --socket=/tmp/tmpA4tVug/mysql.sock

#...done.

# Connecting to spawned server

2018-07-13T00:36:34.461329Z 2 [Note] Aborted connection 2 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)

done.

# Reading .frm files

#

# Reading the t_child.frm file.

# Changing engine for .frm file /tmp/tmpA4tVug/tmp_temp/t_child.frm:

# Skipping to header at : 2

# General Data from .frm file:

{'IO_SIZE': 4096,

 'MYSQL_VERSION_ID': 50722,

 'avg_row_length': 0,

 'charset_low': 0,

 'create_options': 8,

 'db_create_pack': 2,

 'default_charset': 8,

 'default_part_eng': 0,

 'extra_size': 31,

 'frm_file_ver': 5,

 'frm_version': 9,

 'key_block_size': 0,

 'key_info_length': 60,

 'key_length': 706,

 'legacy_db_type': 'INNODB',

 'length': 12288,

 'max_rows': 0,

 'min_rows': 0,

 'rec_length': 9,

 'row_type': 0,

 'table_charset': 8,

 'tmp_key_length': 706}

# Engine string: InnoDB

# Server version in file: 5.7.22

#

# CREATE statement for /tmp/t_child.frm:

#

CREATE TABLE `tmp`.`t_child` (

  `child_id` int(11) NOT NULL AUTO_INCREMENT,

  `parent_id` int(11) DEFAULT NULL,

  PRIMARY KEY (`child_id`),

  KEY `parent_id` (`parent_id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1

# Shutting down spawned server

# Removing the temporary datadir

2018-07-13T00:36:34.502751Z 0 [Note] Giving 0 client threads a chance to die gracefully

2018-07-13T00:36:34.502772Z 0 [Note] Shutting down slave threads

2018-07-13T00:36:34.502777Z 0 [Note] Forcefully disconnecting 0 remaining clients

2018-07-13T00:36:34.502785Z 0 [Note] Event Scheduler: Purging the queue. 0 events

2018-07-13T00:36:34.502916Z 0 [Note] Binlog end

2018-07-13T00:36:34.502973Z 0 [Note] Shutting down plugin 'ngram'

2018-07-13T00:36:34.502979Z 0 [Note] Shutting down plugin 'ARCHIVE'

2018-07-13T00:36:34.502982Z 0 [Note] Shutting down plugin 'partition'

2018-07-13T00:36:34.502985Z 0 [Note] Shutting down plugin 'BLACKHOLE'

2018-07-13T00:36:34.502989Z 0 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'

2018-07-13T00:36:34.503028Z 0 [Note] Shutting down plugin 'CSV'

2018-07-13T00:36:34.503032Z 0 [Note] Shutting down plugin 'MEMORY'

2018-07-13T00:36:34.503036Z 0 [Note] Shutting down plugin 'MRG_MYISAM'

2018-07-13T00:36:34.503041Z 0 [Note] Shutting down plugin 'MyISAM'

2018-07-13T00:36:34.503049Z 0 [Note] Shutting down plugin 'INNODB_SYS_VIRTUAL'

2018-07-13T00:36:34.503052Z 0 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'

2018-07-13T00:36:34.503055Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'

2018-07-13T00:36:34.503058Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'

2018-07-13T00:36:34.503061Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'

2018-07-13T00:36:34.503064Z 0 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'

2018-07-13T00:36:34.503066Z 0 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'

2018-07-13T00:36:34.503069Z 0 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'

2018-07-13T00:36:34.503072Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'

2018-07-13T00:36:34.503075Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLES'

2018-07-13T00:36:34.503077Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'

2018-07-13T00:36:34.503080Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'

2018-07-13T00:36:34.503083Z 0 [Note] Shutting down plugin 'INNODB_FT_CONFIG'

2018-07-13T00:36:34.503086Z 0 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'

2018-07-13T00:36:34.503088Z 0 [Note] Shutting down plugin 'INNODB_FT_DELETED'

2018-07-13T00:36:34.503091Z 0 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'

2018-07-13T00:36:34.503094Z 0 [Note] Shutting down plugin 'INNODB_METRICS'

2018-07-13T00:36:34.503096Z 0 [Note] Shutting down plugin 'INNODB_TEMP_TABLE_INFO'

2018-07-13T00:36:34.503099Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'

2018-07-13T00:36:34.503102Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'

2018-07-13T00:36:34.503105Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'

2018-07-13T00:36:34.503108Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'

2018-07-13T00:36:34.503111Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'

2018-07-13T00:36:34.503113Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'

2018-07-13T00:36:34.503116Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM'

2018-07-13T00:36:34.503119Z 0 [Note] Shutting down plugin 'INNODB_CMP_RESET'

2018-07-13T00:36:34.503122Z 0 [Note] Shutting down plugin 'INNODB_CMP'

2018-07-13T00:36:34.503124Z 0 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'

2018-07-13T00:36:34.503127Z 0 [Note] Shutting down plugin 'INNODB_LOCKS'

2018-07-13T00:36:34.503130Z 0 [Note] Shutting down plugin 'INNODB_TRX'

2018-07-13T00:36:34.503132Z 0 [Note] Shutting down plugin 'InnoDB'

2018-07-13T00:36:34.503182Z 0 [Note] InnoDB: FTS optimize thread exiting.

2018-07-13T00:36:34.503325Z 0 [Note] InnoDB: Starting shutdown...

#...done.

[test@slowtech ~]$ 2018-07-13T00:36:34.603656Z 0 [Note] InnoDB: Dumping buffer pool(s) to /tmp/tmpA4tVug/ib_buffer_pool

2018-07-13T00:36:34.603717Z 0 [ERROR] InnoDB: Cannot open '/tmp/tmpA4tVug/ib_buffer_pool.incomplete' for writing: No such file or directory

2018-07-13T00:36:35.517978Z 0 [Note] InnoDB: Shutdown completed; log sequence number 2589175

2018-07-13T00:36:35.518034Z 0 [Note] Shutting down plugin 'sha256_password'

2018-07-13T00:36:35.518040Z 0 [Note] Shutting down plugin 'mysql_native_password'

2018-07-13T00:36:35.518200Z 0 [Note] Shutting down plugin 'binlog'

2018-07-13T00:36:35.518563Z 0 [Note] Unable to delete pid file: No such file or directory

2018-07-13T00:36:35.518568Z 0 [Note] /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64/bin/mysqld: Shutdown complete

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