Release Team[oR] 2001 [x] Database - Kataix Umag Cl

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Figure 4.5 Dropping a database using mysqladmin.You may have noticed that when using mysqladmin, you are prompted before deleting the database.This is very helpful for the beginning database administrator, as well as the seasoned veteran. It allowsone last moment of reflection before all your data is lost.The CREATE and DROP arguments of the mysqladmin utility are not case sensitive, but the name of thedatabase is case sensitive. Another notable point is that you must have the authority to use CREATEand DROP. As root, you have this authority, but if you are not an administrator, you will not be able touse these commands.Adding UsersNow that you have your database up and running, you should give other users the ability to use thedatabase. Today, you will learn how to add users; explaining permissions and user privileges are covered inmore detail on Day 17, "MySQL <strong>Database</strong> Security."To allow a user from your local machine—referred to hereafter as localhost—to gain access to yourdatabase, the user must exist in several places. The MySQL RDBMS contains a database namedmysql. This database holds all the permissions for all MySQL databases. This database consists of thefollowing tables:• User The table that holds all the names, passwords, hosts, and privileges of all theusers of this MySQL RDBMS• db The table that contains all the users, databases, and hostnames for this MySQLRDBMS.• host The table that contains all hostnames, databases, and privileges they hold forthis MySQL RDBMSFor a person to use your database, the hostname of the machine from which he or she will beconnecting must exist in the host table. The user must exist in the user table, and the database mustexist in the db table. Complete the following steps to give another user the ability to use your databasefrom the local machine.1. First, make sure the daemon is running and that you are currently in the mysqldirectory.2. Add the hostname and database to the host table. To do this, you must use theMySQL monitor.3. bin/mysql –p4. Next, you must make the mysql database the active database. To do this, type thefollowing:5. USE mysql;NoteRemember, commands are not case sensitive, but the database objectsare.6. To add the hostname/database combination to this MySQL RDBMS, you must use anSQL INSERT command. Type the following from the command line:7. INSERT INTO mysql VALUES('localhost','sample_db',8. 'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y');Remember that if you do not type a a \g, the MySQL monitor will continue your statement on thefollowing line. This is helpful because it allows for easily readable commands, and, if you make amistake, you can use the history key to bring it back.Your output should look like that in Figure 4.6.- 36 -
Figure 4.6 Adding a host to the host table.The next step is to make sure you have users to add to your database. You will add a user now.INSERT INTO user VALUES('localhost','TestUser',PASSWORD('pass123'),'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y')The PASSWORD function is an intrinsic function, that is, a function that can be called from within MySQL.You will learn about intrinsic functions in more detail on Day 10, "Letting MySQL Do the Work—IntrinsicFunctions." The password function takes a string as an argument and encrypts it. This encrypted wordis stored in the database. This prevents prying eyes from easily discovering the passwords of all yourusers with a simple query to the mysql database. It's best to get in the habit of adding users in thismanner.You are now ready to add your database and users to the mysql database. To do this, enter thefollowing:INSERT INTO db VALUES('localhost','sample_db','TestUser','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y')Let's review what you have done. To allow a person to use the sample_db database from the localmachine, several things must be in place. You will need the hostname of the computer the user will beusing to connect to your database. In the example, you are going to use the same machine that has theMySQL RDBMS installed. Your machine may have a really cool name, but MySQL only requires thename 'localhost' to describe a local machine. If you were connecting to another mysql databasefrom your machine, your machine's name would have to be in that database. The second thing thatneeds to be in place is a user. You can add users at any time. Because I'm assuming that you have afresh installation, I went through the process of adding a user. After the user is added, you could goahead and give this user permission to use your database. You did this by adding the user to the dbtable. The advantages of doing things this way will be covered in great detail on Day 16.Creating the Meet_A_Geek <strong>Database</strong>You will create the Meet_A_Geek database using the mysqladmin utility. (You will add users in a laterlesson.) You will use this database as an example throughout the book, building upon it in each lesson. Tocreate the database, do the following:1. Make sure the daemon is active and that you are in the mysql directory.2. To create the database, enter the following:3. bin/mysqladmin –p CREATE Meet_A_GeekSummaryYesterday, you learned the importance of proper designing. Today, you took the first step to bringing yourdesign to life. You have achieved an important milestone: You created your first MySQL database. You alsolearned today that the developers of MySQL give you more than one option to accomplish this task. If youare a command junkie, you can use the mysqladmin utility, and if you are an SQL fan, you can use an SQLstatement to accomplish the same thing. Either way, you are heading in the right direction to becoming aMySQL DBA.- 37 -
Page 1 and 2: Release Team[oR] 2001[x] Database
Page 3 and 4: Day 16 - MySQL and Time - 171Day 17
Page 5 and 6: several major corporations. Mark st
Page 7 and 8: Week 2 is dedicated to teaching you
Page 9 and 10: This is a lot material to cover in
Page 11 and 12: In addition to the previously discu
Page 13 and 14: MySQL is a relational database. It
Page 15 and 16: Figure 2.1 New MySQL Windows instal
Page 17 and 18: espond to the shopper's requests do
Page 19 and 20: Figure 2.5 Viewing existing databas
Page 21 and 22: Q&AQ: What do I do if I forget the
Page 23 and 24: scope of this book. A really good b
Page 25 and 26: Figure 3.3 Key fields in a one-to-o
Page 27 and 28: fields that you have created. Remem
Page 29 and 30: Figure 3.11 The Customers object.Th
Page 31 and 32: Figure 3.12 The final Meet_A_Geek d
Page 33 and 34: The process of creating a database
Page 35: Figure 4.3 Dropping a database.mysq
Page 39 and 40: Product_Name2Product_Cost2Product_P
Page 41 and 42: to understand smaller, more tangibl
Page 43 and 44: Strong Join-Protection Normal Form,
Page 45 and 46: You should see a list of tables ava
Page 47 and 48: Changing a Column NameSometimes you
Page 49 and 50: Deciding Which Columns to Include i
Page 51 and 52: The MySQL Supported TypesMySQL has
Page 53 and 54: inserted row into an AUTO_INCREMENT
Page 55 and 56: slow things down considerably. TEXT
Page 57 and 58: variable and fixed length. You lear
Page 59 and 60: As you can see, there are many diff
Page 61 and 62: mysqld daemon must be running and y
Page 63 and 64: To begin, you need a database that
Page 65 and 66: Figure 8.6 The Export Text Wizard.1
Page 67 and 68: Figure 8.11 Output from DESCRIBE Or
Page 69 and 70: -q or -quick-T path or -tab =path-w
Page 71 and 72: Q&AQ: What can I do with the conten
Page 73 and 74: LIKEASBasic SQL SyntaxTo talk to th
Page 75 and 76: SELECT column name FROM table name
Page 77 and 78: Truck_Number INT,Driver_ID INT)You
Page 79 and 80: ecords that match your WHERE clause
Page 81 and 82: FROM Customer as C, Order as OWHERE
Page 83 and 84: This function adds all the values t
Page 85 and 86: • First Name: Jerry• Last Name:
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How Does MySQL Help?MySQL provides
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The MOD() function takes two argume
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LTRIM, RTRIM, TRIMThese handy littl
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SummaryMySQL provides a number of i
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Figure 11.2 Safer processing with l
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PerformanceAn application may need
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You should look at the CREATE TABLE
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1 row in set (0.00 sec)Note For col
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table's primary key. In contrast, k
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• MySQL will not allow you to cre
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. A table of products available to
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Getting to the DataEvery interface
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Q&AQ: How are my queries executed?A
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Figure 13.3 Data Sources dialog box
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Figure 13.7 Creating a new Data Sou
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Conn.CloseThank You For SigningOur
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VBScript DeclarationsVariables can
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110 Dim vRecordCount 'Counter120 Di
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580 rstCustomers.MoveNext590 'Incre
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Hopefully, with these examples, you
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Execute()PreparedStatethat MySQL do
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instead of the Microsoft constant b
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Please describe yourself:*Age------
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330 'check gender340 If Request("Co
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Displaying Data to the Web PageNow
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460 ' This will alternate the row c
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Finally, you saw how everything com
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Installing from the CD-ROMNote The
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you could easily generate two handl
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60 $my $sth = $dbh->prepare("SELECT
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Listing 14.2 shows the code for the
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State:Zip: &
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$Vendor_Name = $postInputs{'Vendor_
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Note A hash or an associative array
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Q&AQ: Why is the Perl DBI so powerf
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Enter PHPCGIs can be written in a n
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The following are some simple assig
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Apart from assigning values, you ca
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Control Structures: forA more compl
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When you define a user-defined func
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mysql_create_dbmysql_drop_dbmysql_d
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Creating a DatabaseYou can create a
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forward one row through the array t
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You can specify time without delimi
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Getting Day InformationThere are fo
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| NULL |+----------------+Extractin
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%T 24-hour time (hh:mm:ss)%Y Numeri
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+-----------------+or, when used in
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+----------------------------------
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form as MySQL outputs it (YYYY-MM-D
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• Db The database that contains t
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Figure 17.2 The request verificatio
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IDENTIFIED BY "password"[WITH GRANT
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These commands will delete Scott’
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Day 18: How MySQL ComparesOverviewT
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MySQL is not a transactional databa
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{strcpy(message,"Wrong arguments to
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db=Meet_A_Geek;uid=sa;pwd=taco".Ope
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The next biggest detriment is the h
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that contains the CREATE TABLE stat
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Lowe Justin 3 Hill Walk, Twin Creek
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1. Run the MySQL server with loggin
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Now you can run exactly the same th
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• -h, --host=hostname Connect to
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Note that a MySQL process, as shown
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• -e, --extend-check Checks a fil
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username -p database_nameThis will
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tmpdir/tmp/version3.22.23bwait_time
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application check this table to see
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3. Look at your table design. Is it
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Figure 21.1 The Meet-A-Geek Web sit
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Normalizing the DatabaseYou decide
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of the tables. They will also have
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*FirstName:*LastName:Middle:*Addres
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Gender:MaleFemaleRace:CaucasianAfri
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Occupation: - 237 -
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$Address = $field{'Address'} ;$City
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$errmsg = "Please enter a valid ema
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$dbh->disconnect;## if everything c
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Logging in a UserThe next part you'
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The script that is called when a us
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print ''."\n" ;print ''."\n" ;print
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print 'bgcolor="#FFFFFF" text="#000
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print ''."\n" ;print " \n" ;print '
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Figure 21.5 The Post an Ad Web page
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BrownAny ColorBlackBlondehair.&nbsp
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Listing 21.6 is the complete script
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$Build = "AND C.Eye_Color ='$Eyes'
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print 'bgcolor="#FFFFFF" colspan="5
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print 'Ad';print ''."\n" ;print " \
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print ' '."\n" ;print " \n" ;print
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print "\n" ;print "\n" ;print "\n"
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Test and DeployThe final steps in t
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This command creates an index on a
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Example:FLUSH PRIVILEGES• HOSTS C
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Example:OPTIMIZE TABLE CustomersREP
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ASIN(x)Returns the arc sine of x. R
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Example:SELECT COS(4)Result:-0.6536
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%y%j%a%d%r%T%H%h%"i"%SExample:SELEC
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ENCRYPT(word[, seed])Returns an enc
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"F"HOUR(time)Returns the hour given
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Result:This command will load the c
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"March"NOW()Returns the current dat
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REPLACE(x, y, z)Returns the string
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SQRT(x)Returns the square root of x
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Result:"ark"Example:SELECT TRIM(BOT
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You will find that MySQL is priced
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in/mysqldump -p -t --fields-termina
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Day 15Day 16Day 17on the state the
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The answer to this question can be
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Day 13: How to Use MyODBCTable 13.1
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