Php query voting exercises (0508), php0508
Exercise questions:
Solution:
Method 1:
1. Voting homepage:
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">3. Create a database access class and encapsulate it for reference:
<? Php // execute an SQL statement and return the corresponding result class DBDA {public $ host = "localhost"; // database server address public $ uid = "root "; // database username public $ password = ""; // Database password // The method for executing the SQL statement // $ SQL indicates the SQL statement to be executed; $ type is the type of SQL statement. 0 indicates Query, and 1 indicates other statements (add, delete, modify, and delete). $ db indicates the function Query of the database to be operated ($ SQL, $ type = 0, $ db = "mydb") {// create a connection object $ dbconnect = new MySQLi ($ this-> host, $ this-> uid, $ this-> password, $ db); // determines whether the connection has an error! Mysqli_connect_error () or die ("connection failed! "); // Execute the SQL statement $ result = $ dbconnect-> query ($ SQL); // determine the SQL statement type if ($ type = 0) {// if it is a two-dimensional array return $ result-> fetch_all ();} else {// if it is another statement, returns true or falsereturn $ result ;}}}Method 2:
1. Voting homepage:
<Html xmlns = "http://www.w3.org/1999/xhtml">2. process the voting page:
<? Php $ arr = $ _ POST ["xx"]; include (".. /DBDA. class. php "); $ db = new DBDA (); foreach ($ arr as $ v) {$ SQL = "update diaoyanxuanxiang set numbers = numbers + 1 where ids = '{$ v}'"; $ db-> Query ($ SQL, 1 ); // 1 indicates the $ SQL type} header ("location: TouPiao. php ");?>3. view the voting result page:
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Webpage display result:
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