Mysql & Php

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Mysql & Php

  1. 1. MYSQL & PHP Inbal Geffen
  2. 2. What is MySQL? ● MySQL is a database server ● MySQL is ideal for both small and large applications ● MySQL supports standard SQL ● MySQL compiles on a number of platforms ● MySQL is free to download and useInbal Geffen
  3. 3. What is MySQL?The data in MySQL is stored in database objectscalled tables.A table is a collection of related data entries and itconsists of columns and rows.Databases are useful when storing informationcategorically. A company may have a database withthe following tables: "Employees", "Products","Customers" and "Orders".Inbal Geffen
  4. 4. Database TablesA database most often contains one or more tables.Each table is identified by a name (e.g. "Customers"or "Orders"). Tables contain records (rows) withdata. LastName FirstName Age City Jill Jack 30 NY Cruise Tom 23 NY Bradshaw Kari 30 NYBelow is an example of a table called "Persons":The table above contains three records (one foreach person) and four columns (LastName,FirstName, Age, and City).Inbal Geffen
  5. 5. QueriesA query is a question or a request.With MySQL, we can query a database for specificinformation and have a recordset returned.Look at the following query:SELECT LastName FROM PersonsThe query above selects all the data in the"LastName" column from the "Persons" table, andwill return a recordset like this: LastName Jill Cruise BradshawInbal Geffen
  6. 6. PHP+MySQL - Connect to a DatabaseBefore you can access data in a database, you mustcreate a connection to the database.In PHP, this is done with the mysql_connect()function.Syntaxmysql_connect(servername,username,password);<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }// some code?>Inbal Geffen
  7. 7. Closing a connectionThe connection will be closed automatically whenthe script ends.To close the connection before, use themysql_close() function:<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }// some codemysql_close($con);?>Inbal Geffen
  8. 8. Create a database<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }if (mysql_query("CREATE DATABASE my_db",$con)) { echo "Database created"; }else { echo "Error creating database: " . mysql_error(); }mysql_close($con);?>Inbal Geffen
  9. 9. Create a table<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }// Create databaseif (mysql_query("CREATE DATABASE my_db",$con)) { echo "Database created";}else { echo "Error creating database: " . mysql_error();}// Create tablemysql_select_db("my_db", $con); //A database must be selected before a table can be created$sql = "CREATE TABLE Persons(FirstName varchar(15),LastName varchar(15),Age int)";// Execute querymysql_query($sql,$con);mysql_close($con);?>Inbal Geffen
  10. 10. Insert Data Into a Database Table<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);mysql_query("INSERT INTO Persons (FirstName, LastName, Age)VALUES (Peter, Griffin,35)");mysql_query("INSERT INTO Persons (FirstName, LastName, Age)VALUES (Jack, Jill,33)");mysql_close($con);?>Inbal Geffen
  11. 11. Insert Data From a Form Into a Database<html><body><form action="insert.php" method="post">Firstname: <input type="text" name="firstname">Lastname: <input type="text" name="lastname">Age: <input type="text" name="age"><input type="submit"></form></body></html>When a user clicks the submit button in the HTML form in theexample above, the form data is sent to "insert.php".The "insert.php" file connects to a database, and retrieves the valuesfrom the form with the PHP $_POST variables.Then, the mysql_query() function executes the INSERT INTOstatement, and a new record will be added to the "Persons" table.Inbal Geffen
  12. 12. Insert Data From a Form Into a Database<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);$sql="INSERT INTO Persons (FirstName, LastName, Age)VALUES($_POST[firstname],$_POST[lastname],$_POST[age])";if (!mysql_query($sql,$con)) { die(Error: . mysql_error()); }echo "1 record added";mysql_close($con);?>Inbal Geffen
  13. 13. Select Data From a Database Table<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);$result = mysql_query("SELECT * FROM Persons");while($row = mysql_fetch_array($result)) { echo $row[FirstName] . " " . $row[LastName]; echo "<br />"; }mysql_close($con);?>Inbal Geffen
  14. 14. Display the Result in an HTML Table<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);$result = mysql_query("SELECT * FROM Persons");echo "<table border=1><tr><th>Firstname</th><th>Lastname</th></tr>";while($row = mysql_fetch_array($result)) { echo "<tr>"; echo "<td>" . $row[FirstName] . "</td>"; echo "<td>" . $row[LastName] . "</td>"; echo "</tr>"; }echo "</table>";mysql_close($con);?>Inbal Geffen
  15. 15. Display the Result in an HTML Table<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);$result = mysql_query("SELECT * FROM Persons");echo "<table border=1><tr><th>Firstname</th><th>Lastname</th></tr>";while($row = mysql_fetch_array($result)) { echo "<tr>"; echo "<td>" . $row[FirstName] . "</td>"; echo "<td>" . $row[LastName] . "</td>"; echo "</tr>"; }echo "</table>";mysql_close($con);?>Inbal Geffen
  16. 16. Where<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);$result = mysql_query("SELECT * FROM PersonsWHERE FirstName=Jack");while($row = mysql_fetch_array($result)) { echo $row[FirstName] . " " . $row[LastName]; echo "<br>"; }?>Inbal Geffen
  17. 17. Order By<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);$result = mysql_query("SELECT * FROM Persons ORDER BY age");while($row = mysql_fetch_array($result)) { echo $row[FirstName]; echo " " . $row[LastName]; echo " " . $row[Age]; echo "<br>"; }mysql_close($con);?>Inbal Geffen
  18. 18. Update<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);mysql_query("UPDATE Persons SET Age=36WHERE FirstName=Jack AND LastName=Jill");mysql_close($con);?>Inbal Geffen
  19. 19. Delete<?php$con = mysql_connect("localhost","peter","abc123");if (!$con) { die(Could not connect: . mysql_error()); }mysql_select_db("my_db", $con);mysql_query("DELETE FROM Persons WHERE LastName=Griffin");mysql_close($con);?>Inbal Geffen

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