• mysql文件


    MySQL的每个数据库都对应存放在一个与数据库同名的文件夹中,MySQL数据库文件包括MySQL(server)所建数据库文件和MySQL(server)所用存储引擎创建的数据库文件。  

        .frm文件:存储数据表的框架结构,文件名与表名相同,每个表对应一个同名frm文件,与操作系统和存储引擎无关,即不管MySQL运行在何种操作系统上,使用何种存储引擎,都有这个文件。     MySQL Server 5.1data

       InnoDB数据库文件(即InnoDB文件集,ib-file set):

                  ibdata1、ibdata2等:系统表空间文件,存储InnoDB系统信息和用户数据库表数据和索引,所有表共用

                 .ibd文件:单表表空间文件,每个表使用一个表空间文件(file per table),存放用户数据库表数据和索引

                 日志文件: ib_logfile1、ib_logfile2

    查看数据库本地存储位置: show variables like '%datadir%';

    .myini配置文件

    mysql5.0以上版本支持三种sql_mode模式:ANSI、TRADITIONAL和STRICT_TRANS_TABLES。-----------------show variables like '%datadir%';

      ANSI模式:

    mysql> set @@sql_mode=ANSI;   
    Query OK, 0 rows affected (0.00 sec)   
      
    mysql> create table test(name varchar(4), pass varchar(4));   
    Query OK, 0 rows affected (0.03 sec)   
      
    mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb');   
    Query OK, 2 rows affected, 2 warnings (0.02 sec)   
    Records: 2  Duplicates: 0  Warnings: 2  
      
    mysql> show warnings;   
    +---------+------+-------------------------------------------+   
    | Level   | Code | Message                                   |   
    +---------+------+-------------------------------------------+   
    | Warning | 1265 | Data truncated for column 'name' at row 1 |   
    | Warning | 1265 | Data truncated for column 'pass' at row 1 |   
    +---------+------+-------------------------------------------+   
    2 rows in set (0.00 sec)   
      
    mysql> select * from test;   
    +------+------+   
    | name | pass |   
    +------+------+   
    | aaaa | aaaa |   
    | bbbb | bbbb |   
    +------+------+   
    2 rows in set (0.00 sec)  

      STRICT_TRANS_TABLES模式:

    mysql> set @@sql_mode=STRICT_TRANS_TABLES;   
    Query OK, 0 rows affected (0.00 sec)   
      
    mysql> create table test(name varchar(4), pass varchar(4));   
    Query OK, 0 rows affected (0.02 sec)   
      
    mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb');   
    ERROR 1406 (22001): Data too long for column 'name' at row 1  
      
    mysql> show errors;   
    +-------+------+------------------------------------------+   
    | Level | Code | Message                                  |   
    +-------+------+------------------------------------------+   
    | Error | 1406 | Data too long for column 'name' at row 1 |   
    +-------+------+------------------------------------------+   
    1 row in set (0.00 sec)   
      
    mysql> select * from test;   
    Empty set (0.00 sec)  

      TRADITIONAL模式:

    mysql> set @@sql_mode=TRADITIONAL;   
    Query OK, 0 rows affected (0.00 sec)   
      
    mysql> create table test(name varchar(4), pass varchar(4));   
    Query OK, 0 rows affected (0.02 sec)   
      
    mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb');   
    ERROR 1406 (22001): Data too long for column 'name' at row 1  
      
    mysql> show errors;   
    +-------+------+------------------------------------------+   
    | Level | Code | Message                                  |   
    +-------+------+------------------------------------------+   
    | Error | 1406 | Data too long for column 'name' at row 1 |   
    +-------+------+------------------------------------------+   
    1 row in set (0.00 sec)   
      
    mysql> select * from test;   
    Empty set (0.00 sec)  
     



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  • 原文地址:https://www.cnblogs.com/scmath/p/10195521.html
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