Php My Sql

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Php My Sql

  1. 1. Database
  2. 2. <ul><li>PHP </li></ul><ul><li>support variety of database management systems, including : </li></ul><ul><ul><ul><li>- MySQL - PostgreSQL </li></ul></ul></ul><ul><ul><ul><li>- Oracle - Microsoft Access </li></ul></ul></ul><ul><li>MySQL </li></ul><ul><ul><li>very fast </li></ul></ul><ul><ul><li>very reliable </li></ul></ul><ul><ul><li>very feature-rich open-source RDBMS </li></ul></ul><ul><ul><li>Every MySQL database is composed of : </li></ul></ul><ul><ul><li>one or more tables . </li></ul></ul><ul><ul><li>These tables, which: </li></ul></ul><ul><ul><li>structure data into rows and columns, </li></ul></ul><ul><ul><li>are what lend organization to the data. </li></ul></ul>
  3. 3. CREATE DATABASE testdb; CREATE TABLE `symbols` (     `id` int(11) NOT NULL auto_increment,     `country` varchar(255) NOT NULL default '',     `animal` varchar(255) NOT NULL default '',     PRIMARY KEY  (`id`) ) INSERT INTO `symbols` VALUES (1, 'America', 'eagle'); INSERT INTO `symbols` VALUES (2, 'China', 'dragon'); INSERT INTO `symbols` VALUES (3, 'England', 'lion'); INSERT INTO `symbols` VALUES (4, 'India', 'tiger'); INSERT INTO `symbols` VALUES (5, 'Australia', 'kangaroo'); INSERT INTO `symbols` VALUES (6, 'Norway', 'elk'); FROM My SQL
  4. 4. Retrieve data from My Sql Database in PHP <?php // set database server access variables: $host = &quot;localhost&quot; ; $user = &quot;test&quot; ; $pass = &quot;test&quot; ; $db = &quot;testdb&quot; ; // open connection $connection = mysql_connect ( $host , $user , $pass ) or die ( &quot;Unable to connect!&quot; ); // select database mysql_select_db ( $db ) or die ( &quot;Unable to select database!&quot; ); // create query $query = &quot;SELECT * FROM symbols&quot; ; // execute query $result = mysql_query ( $query ) or die ( &quot;Error in query: $query. &quot; . mysql_error ()); Cont …
  5. 5. // see if any rows were returned if ( mysql_num_rows ( $result ) > 0 ) {      // yes     // print them one after another      echo &quot;<table cellpadding=10 border=1>&quot; ;     while( $row = mysql_fetch_row ( $result )) {         echo &quot;<tr>&quot; ;         echo &quot;<td>&quot; . $row [ 0 ]. &quot;</td>&quot; ;         echo &quot;<td>&quot; . $row [ 1 ]. &quot;</td>&quot; ;         echo &quot;<td>&quot; . $row [ 2 ]. &quot;</td>&quot; ;         echo &quot;</tr>&quot; ;     }     echo &quot;</table>&quot; ; } else {      // no     // print status message      echo &quot;No rows found!&quot; ; } // free result set memory mysql_free_result ( $result ); // close connection mysql_close ( $connection ); ?>
  6. 6. OUTPUT
  7. 7. mysql_fetch_array() Returns an array that corresponds to the fetched row and moves the internal data pointer ahead. mysql_fetch_row() returns a numerical array that corresponds to the fetched row and moves the internal data pointer ahead. mysql_fetch_assoc() returns an associative array that corresponds to the fetched row and moves the internal data pointer ahead. mysql_fetch_assoc() is equivalent to calling mysql_fetch_array() with MYSQL_ASSOC for the optional second parameter. It only returns an associative array. mysql_fetch_object() returns an object with properties that correspond to the fetched row and moves the internal data pointer ahead.
  8. 8. mysql_fetch_array() <?php $host = &quot;localhost&quot; ; $user = &quot;root&quot; ; $pass = &quot;guessme&quot; ; $db = &quot;testdb&quot; ; $connection = mysql_connect ( $host , $user , $pass ) or die ( &quot;Unable to connect!&quot; ); // get database list $query = &quot;SHOW DATABASES&quot; ; $result = mysql_query ( $query ) or die ( &quot;Error in query: $query. &quot; . mysql_error ()); echo &quot;<ul>&quot; ; while ( $row = mysql_fetch_array ( $result )) {     echo &quot;<li>&quot; . $row [ 0 ];      // for each database, get table list and print      $query2 = &quot;SHOW TABLES FROM &quot; . $row [ 0 ];      $result2 = mysql_query ( $query2 ) or die ( &quot;Error in query: $query2. &quot; . mysql_error ());     echo &quot;<ul>&quot; ;     while ( $row2 = mysql_fetch_array ( $result2 )) {         echo &quot;<li>&quot; . $row2 [ 0 ]; }     echo &quot;</ul>&quot; ; } echo &quot;</ul>&quot; ; // get version and host information echo &quot;Client version: &quot; . mysql_get_client_info (). &quot;<br />&quot; ; echo &quot;Server version: &quot; . mysql_get_server_info (). &quot;<br />&quot; ; echo &quot;Protocol version: &quot; . mysql_get_proto_info (). &quot;<br />&quot; ; echo &quot;Host: &quot; . mysql_get_host_info (). &quot;<br />&quot; ; // get server status $status = mysql_stat (); echo $status ; // close connection mysql_close ( $connection ); ?>
  9. 9. OUTPUT
  10. 10. mysql_fetch_row() // see if any rows were returned if ( mysql_num_rows ( $result ) > 0 ) {       // yes      // print them one after another       echo &quot;<table cellpadding=10 border=1>&quot; ;      while(list( $id , $country , $animal )  = mysql_fetch_row ( $result )) {           echo &quot;<tr>&quot; ;           echo &quot;<td>$id</td>&quot; ;           echo &quot;<td>$country</td>&quot; ;           echo &quot;<td>$animal</td>&quot; ;           echo &quot;</tr>&quot; ;      }      echo &quot;</table>&quot; ; } else {       // no      // print status message       echo &quot;No rows found!&quot; ; } OUTPUT
  11. 11. mysql_fetch_assoc() // see if any rows were returned if ( mysql_num_rows ( $result ) > 0 ) {      // yes     // print them one after another      echo &quot;<table cellpadding=10 border=1>&quot; ;     while( $row = mysql_fetch_assoc ( $result )) {         echo &quot;<tr>&quot; ;         echo &quot;<td>&quot; . $row [ 'id' ]. &quot;</td>&quot; ;         echo &quot;<td>&quot; . $row [ 'country' ]. &quot;</td>&quot; ;         echo &quot;<td>&quot; . $row [ 'animal' ]. &quot;</td>&quot; ;         echo &quot;</tr>&quot; ;     }     echo &quot;</table>&quot; ; } else {      // no     // print status message      echo &quot;No rows found!&quot; ; } OUTPUT
  12. 12. mysql_fetch_object() // see if any rows were returned if ( mysql_num_rows ( $result ) > 0 ) {      // yes     // print them one after another      echo &quot;<table cellpadding=10 border=1>&quot; ;     while( $row   = mysql_fetch_object ( $result )) {         echo &quot;<tr>&quot; ;         echo &quot;<td>&quot; . $row -> id . &quot;</td>&quot; ;         echo &quot;<td>&quot; . $row -> country . &quot;</td>&quot; ;         echo &quot;<td>&quot; . $row -> animal . &quot;</td>&quot; ;         echo &quot;</tr>&quot; ;     }     echo &quot;</table>&quot; ; } else {      // no     // print status message      echo &quot;No rows found!&quot; ; } OUTPUT
  13. 13. Form application in php and mysql database <html> <head> <basefont face=&quot;Arial&quot;> </head> <body> <?php if (!isset( $_POST [ 'submit' ])) { // form not submitted ?>     <form action=&quot; <?=$_SERVER [ 'PHP_SELF' ] ?> &quot; method=&quot;post&quot;>     Country: <input type=&quot;text&quot; name=&quot;country&quot;>     National animal: <input type=&quot;text&quot; name=&quot;animal&quot;>     <input type=&quot;submit&quot; name=&quot;submit&quot;>     </form> Cont …
  14. 14. <?php } else { // form submitted // set server access variables      $host = &quot;localhost&quot; ;      $user = &quot;test&quot; ;      $pass = &quot;test&quot; ;      $db = &quot;testdb&quot; ;      // get form input     // check to make sure it's all there     // escape input values for greater safety      $country = empty( $_POST [ 'country' ]) ? die ( &quot;ERROR: Enter a country&quot; ) : mysql_escape_string ( $_POST [ 'country' ]);      $animal = empty( $_POST [ 'animal' ]) ? die ( &quot;ERROR: Enter an animal&quot; ) : mysql_escape_string ( $_POST [ 'animal' ]);      // open connection      $connection = mysql_connect ( $host , $user , $pass ) or die ( &quot;Unable to connect!&quot; ); Cont …
  15. 15. // select database      mysql_select_db ( $db ) or die ( &quot;Unable to select database!&quot; );           // create query      $query = &quot;INSERT INTO symbols (country, animal) VALUES ('$country', '$animal')&quot; ;           // execute query      $result = mysql_query ( $query ) or die ( &quot;Error in query: $query. &quot; . mysql_error ());           // print message with ID of inserted record      echo &quot;New record inserted with ID &quot; . mysql_insert_id ();           // close connection      mysql_close ( $connection ); } ?> </body> </html>
  16. 16. OUTPUT
  17. 17. mysqli library <html> <head> <basefont face=&quot;Arial&quot;> </head> <body> <?php // set server access variables $host = &quot;localhost&quot; ; $user = &quot;test&quot; ; $pass = &quot;test&quot; ; $db = &quot;testdb&quot; ; // create mysqli object // open connection $mysqli = new mysqli ( $host , $user , $pass , $db ); // check for connection errors if ( mysqli_connect_errno ()) {     die( &quot;Unable to connect!&quot; ); } // create query $query = &quot;SELECT * FROM symbols&quot; ;
  18. 18. if ( $result = $mysqli -> query ( $query )) {      // see if any rows were returned      if ( $result -> num_rows > 0 ) {          // yes         // print them one after another          echo &quot;<table cellpadding=10 border=1>&quot; ;         while( $row = $result -> fetch_array ()) {             echo &quot;<tr>&quot; ;             echo &quot;<td>&quot; . $row [ 0 ]. &quot;</td>&quot; ;             echo &quot;<td>&quot; . $row [ 1 ]. &quot;</td>&quot; ;             echo &quot;<td>&quot; . $row [ 2 ]. &quot;</td>&quot; ;             echo &quot;</tr>&quot; ;         }         echo &quot;</table>&quot; ;     }     else {          // no         // print status message          echo &quot;No rows found!&quot; ;  }      // free result set memory      $result -> close (); } else {      // print error message      echo &quot;Error in query: $query. &quot; . $mysqli -> error ; } // close connection $mysqli -> close (); ?> </body> </html>
  19. 19. OUTPUT
  20. 20. Delete record from mysqli library <?php // set server access variables $host = &quot;localhost&quot; ; $user = &quot;test&quot; ; $pass = &quot;test&quot; ; $db = &quot;testdb&quot; ; // create mysqli object // open connection $mysqli = new mysqli ( $host , $user , $pass , $db ); // check for connection errors if ( mysqli_connect_errno ()) {     die( &quot;Unable to connect!&quot; ); } // if id provided, then delete that record if (isset( $_GET [ 'id' ])) { // create query to delete record      $query = &quot;DELETE FROM symbols WHERE id = &quot; . $_GET [ 'id' ]; Cont …
  21. 21. // execute query      if ( $mysqli -> query ( $query )) {      // print number of affected rows      echo $mysqli -> affected_rows . &quot; row(s) affected&quot; ;     }     else {      // print error message      echo &quot;Error in query: $query. &quot; . $mysqli -> error ;     } } // query to get records $query = &quot;SELECT * FROM symbols&quot; ; Cont …
  22. 22. // execute query if ( $result = $mysqli -> query ( $query )) {      // see if any rows were returned      if ( $result -> num_rows > 0 ) {          // yes         // print them one after another          echo &quot;<table cellpadding=10 border=1>&quot; ;         while( $row = $result -> fetch_array ()) {             echo &quot;<tr>&quot; ;             echo &quot;<td>&quot; . $row [ 0 ]. &quot;</td>&quot; ;             echo &quot;<td>&quot; . $row [ 1 ]. &quot;</td>&quot; ;             echo &quot;<td>&quot; . $row [ 2 ]. &quot;</td>&quot; ;             echo &quot;<td><a href=&quot; . $_SERVER [ 'PHP_SELF' ]. &quot;?id=&quot; . $row [ 0 ]. &quot;>Delete</a></td>&quot; ;             echo &quot;</tr>&quot; ;         }     }      // free result set memory      $result -> close (); } else {      // print error message      echo &quot;Error in query: $query. &quot; . $mysqli -> error ; } // close connection $mysqli -> close (); ?>
  23. 23. OUTPUT
  24. 24. THE END

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