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TABLE 26-7 SQL Commands
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26:
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Using the previously described relational database, the following command will create the database:
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CREATE DATABASE myphotos
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Before performing any operations on a database, you first access it with the USE command
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USE myphotos
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The tables are created using the CREATE TABLE command; the fields for each table are listed within parentheses following the table name For each field, you need to specify a name, data type, and other options, such as whether it can have a null value
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CREATE TABLE names ( personid INT(5) UNSIGNED NOT NULL, name VARCHAR(20) NOT NULL, street VARCHAR(30) NOT NULL, phone CHAR(8) );
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To insert a record into a table, you can use the INSERT INTO command, though many databases support using data files that can be read all at once To add records, you use the INSERT INTO command with the table name followed by the VALUES option, which is followed in turn by a comma-delimited list of values, one for each field Character values are quoted with single quotes The list is enclosed in parentheses If you have not done so previously, you access the database with the USE command
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INSERT INTO names VALUES (1, 'justin','111 mordor','555-7543');
Once values are added to the tables, you can search them with the SELECT command, specifying field, table name, and the value to be searched
SELECT phone FROM names WHERE phone='555-7543';
MySQL
MySQL is structured on a client/server model with a server daemon (mysqld) filling requests from client programs MySQL is designed for speed, reliability, and ease of use It is meant to be a fast database management system for large databases and, at the same time, a reliable one, suitable for intensive use To create databases, you use the standard SQL language User access can be controlled by assigning privileges
MySQL Configuration
The MySQL supports three different configuration files, one for global settings, another for server-specific settings, and an optional one for user-customized settings The /etc/mycnf configuration file is used for global settings applied to both clients and servers The /etc/mycnf file provides information such as the data directory (/var/lib/mysql) and log file (/var/log/mysqllog) locations, as well as the server base directory (/var/lib)
PART VI
Part VI:
Internet and Network Services
The /var/lib/mysql/mycnf file is used for server settings only The mycnf file allows users to customize their access to MySQL It is located in a user s home directory Note that this is a dot file Sample configuration mycnf files can be found in the mysql-server directory in /usr/ share/doc The mysql-server directory lists configurations for small, medium, large, and huge implementations The administrative manual is located in the mysql directory for /usr/share/doc It is in the info format Use info mysql to start it and the arrow and ENTER keys to move through the menus Here you can find more information about different options
Global Configuration:/etc/mycnf
MySQL specifies options according to different groups, usually the names of server tools The options are arranged in group segments The group name is placed within brackets, and options applied to it follow The default /etc/mycnf file is shown here:
[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysqlsock [mysqlserver] user=mysql basedir=/var/lib [safe_mysqld] err-log=/var/log/mysqldlog pid-file=/var/run/mysqld/mysqldpid
MySQL global options are listed in the /etc/mycnf file Options are set up according to groups that control different behaviors of the MySQL server: mysqld for the daemon, mysqlserver for server options, and safe_mysqld for the MySQL startup script The datadir directory, /var/lib/mysql, is where your database files will be placed Server tools and daemons are located in the basedir directory, /var/lib, and the user that MySQL will run as has the name mysql, as specified in the user option A client group will set up options to be sent to clients, such as the port and socket to use to access the MySQL database
[client] port=3306 socket=/var/lib/mysql/mysqlsock
To see what options are currently set for both client and server, you run mysqld directly with the --help option
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