• mysql学习


    1.添加环境变量:

    右击我的电脑——>属性——>高级系统设置——>环境变量——>系统变量——>Path里添加";C:Program FilesMySQLMySQL Server 8.0in",实际上就是mysql.exe的文件夹。

    2.登录数据库:

    C:UsersAdministrator>mysql -uroot -p
    Enter password: ******

    3.创建数据库:

    mysql> create database ltlscsdb;

    4.查询数据库是否创建:

    mysql> show databases;
    +--------------------+
    | Database |
    +--------------------+
    | information_schema |
    | ltlscsdb |
    | mysql |
    | performance_schema |
    | sakila |
    | sys |
    | world |
    +--------------------+
    7 rows in set (0.00 sec)

    5.进入数据库:

    mysql> use ltlscsdb;
    Database changed

    6.查看数据库中是否有表:

    mysql> show tables;
    Empty set (0.00 sec)

    7.增加表:

     mysql> create table hamu (csDate VARCHAR(32),trainNo VARCHAR(32),

    -> testNo VARCHAR(32),csTime VARCHAR(32),csPosition VARCHAR(32),
    -> csDes TEXT,csReason TEXT,csType VARCHAR(32),csRlt TEXT,
    -> csRetest TEXT,csOther TEXT);
    Query OK, 0 rows affected (0.81 sec)

    mysql> show tables;
    +--------------------+
    | Tables_in_ltlscsdb |
    +--------------------+
    | hamu |
    +--------------------+
    1 row in set (0.05 sec)

    8.查看增加的字段:

    mysql> describe hamu;
    +------------+-------------+------+-----+---------+-------+
    | Field | Type | Null | Key | Default | Extra |
    +------------+-------------+------+-----+---------+-------+
    | csDate | varchar(32) | YES | | NULL | |
    | trainNo | varchar(32) | YES | | NULL | |
    | testNo | varchar(32) | YES | | NULL | |
    | csTime | varchar(32) | YES | | NULL | |
    | csPosition | varchar(32) | YES | | NULL | |
    | csDes | text | YES | | NULL | |
    | csReason | text | YES | | NULL | |
    | csType | varchar(32) | YES | | NULL | |
    | csRlt | text | YES | | NULL | |
    | csRetest | text | YES | | NULL | |
    | csOther | text | YES | | NULL | |
    +------------+-------------+------+-----+---------+-------+
    11 rows in set (0.08 sec)

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  • 原文地址:https://www.cnblogs.com/Joezhang433/p/10244525.html
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