Starting and Terminating mysql

1.4.1 Problem

You want to start and stop the mysql program.

1.4.2 Solution

Invoke mysql from your command prompt to start it, specifying any connection parameters that may be necessary. To leave mysql, use a QUIT statement.

1.4.3 Discussion

To start the mysql program, try just typing its name at your command-line prompt. If mysql starts up correctly, you'll see a short message, followed by a mysql> prompt that indicates the program is ready to accept queries. To illustrate, here's what the welcome message looks like (to save space, I won't show it in any further examples):

% mysql
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 18427 to server version: 3.23.51-log

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql>

If mysql tries to start but exits immediately with an "access denied" message, you'll need to specify connection parameters. The most commonly needed parameters are the host to connect to (the host where the MySQL server runs), your MySQL username, and a password. For example:

% mysql -h localhost -p -u cbuser
Enter password: cbpass

In general, I'll show mysql commands in examples with no connection parameter options. I assume that you'll supply any parameters that you need, either on the command line, or in an option file (Recipe 1.5) so that you don't have to type them each time you invoke mysql.

If you don't have a MySQL username and password, you need to obtain permission to use the MySQL server, as described earlier in Recipe 1.2.

The syntax and default values for the connection parameter options are shown in the following table. These options have both a single-dash short form and a double-dash long form.

Parameter type

Option syntax forms

Default value

Hostname

-h hostname--host=hostname

localhost

Username

-u username--user=username

Your login name

Password

-p--password

None

As the table indicates, there is no default password. To supply one, use --password or -p, then enter your password when mysql prompts you for it:

%

mysql -p

Enter password: figs/u2190.gif enter your password here

If you like, you can specify the password directly on the command line by using either -ppassword (note that there is no space after the -p) or --password=password. I don't recommend doing this on a multiple-user machine, because the password may be visible momentarily to other users who are running tools such as ps that report process information.

If you get an error message that mysql cannot be found or is an invalid command when you try to invoke it, that means your command interpreter doesn't know where mysql is installed. See Recipe 1.8.

To terminate a mysql session, issue a QUIT statement:

mysql> QUIT

You can also terminate the session by issuing an EXIT statement or (under Unix) by typing Ctrl-D.

The way you specify connection parameters for mysql also applies to other MySQL programs such as mysqldump and mysqladmin. For example, some of the actions that mysqladmin can perform are available only to the MySQL root account, so you need to specify name and password options for that user:

% mysqladmin -p -u root shutdown
Enter password:

Using the mysql Client Program

Writing MySQL-Based Programs

Record Selection Techniques

Working with Strings

Working with Dates and Times

Sorting Query Results

Generating Summaries

Modifying Tables with ALTER TABLE

Obtaining and Using Metadata

Importing and Exporting Data

Generating and Using Sequences

Using Multiple Tables

Statistical Techniques

Handling Duplicates

Performing Transactions

Introduction to MySQL on the Web

Incorporating Query Resultsinto Web Pages

Processing Web Input with MySQL

Using MySQL-Based Web Session Management

Appendix A. Obtaining MySQL Software

Appendix B. JSP and Tomcat Primer

Appendix C. References



MySQL Cookbook
MySQL Cookbook
ISBN: 059652708X
EAN: 2147483647
Year: 2005
Pages: 412
Authors: Paul DuBois

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