問題描述

我對 php 和這個論壇很陌生，所以請原諒任何錯誤或錯位的問題.在我提供的代碼中，我只是想在數據庫mydb"中創建一個表.我測試了與數據庫的連接(它有效).這只是我遇到問題的創建表.任何建議或批評將不勝感激.謝謝

I am very new to php and this forum, so please excuse any errors or misplaced questions. In the code i provided, I am just looking to CREATE a Table in the DB "mydb". I tested the connection to the DB(It works). It is just the creating the table i am having issues with. Any advice or criticisms would be appreciated. Thx

<?php
/*
*
* File:         PDOcreateTabletcompany.php
* By:          Jay
* Date:       24-10-13
*
*  This script createsTableintoDB
*
*====================================
*
*/
try {
    $db = new PDO("mysql:dbname=mydb;host=localhost", "root", "" );
} catch(PDOException $e) {
    echo $e->getMessage();
}
$table= "tcompany";
$columns = "ID INT( 11 ) AUTO_INCREMENT PRIMARY KEY, Prename VARCHAR( 50 ) NOT NULL, Name VARCHAR( 250 ) NOT NULL,
 StreetA VARCHAR( 150 ) NOT NULL, StreetB VARCHAR( 150 ) NOT NULL, StreetC VARCHAR( 150 ) NOT NULL, 
 County VARCHAR( 100 ) NOT NULL, Postcode VARCHAR( 50 ) NOT NULL, Country VARCHAR( 50 ) NOT NULL " ;


$createTable = $db->exec("CREATE TABLE IF NOT EXISTS mydb.$table ($columns)");

if ($createTable) 
{
    echo "Table $table - Created!<br /><br />";
}
else { echo "Table $table not successfully created! <br /><br />";
}
?>

推薦答案

由于創建表時沒有行受到影響 $createTable 返回 0 參見 手冊

As no rows are affected when creating table $createTable returns 0 see manual

PDO::exec() 返回修改或刪除的行數通過您發出的 SQL 語句.如果沒有行受到影響，PDO::exec()返回 0.

PDO::exec() returns the number of rows that were modified or deleted by the SQL statement you issued. If no rows were affected,PDO::exec() returns 0.

當您創建表時，如果您的列名是硬編碼的(如下面的代碼所示)，您將不會受到 SQL 注入的影響.我已經離開 $table = "tcompany"; 因為你想打印創建的表(我自己會忽略它)

As you are CREATING a table you will be free from SQL injection if your column names are hard coded( as in the code below). I have left $table = "tcompany";as you want to print table created( I would leave it out myself)

我添加了錯誤處理 將顯示 try 塊中的任何錯誤.

I have added error-handling which will show any errors in try block.

$table = "tcompany";
try {
     $db = new PDO("mysql:dbname=mydb;host=localhost", "root", "" );
     $db->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );//Error Handling
     $sql ="CREATE table $table(
     ID INT( 11 ) AUTO_INCREMENT PRIMARY KEY,
     Prename VARCHAR( 50 ) NOT NULL, 
     Name VARCHAR( 250 ) NOT NULL,
     StreetA VARCHAR( 150 ) NOT NULL, 
     StreetB VARCHAR( 150 ) NOT NULL, 
     StreetC VARCHAR( 150 ) NOT NULL, 
     County VARCHAR( 100 ) NOT NULL,
     Postcode VARCHAR( 50 ) NOT NULL,
     Country VARCHAR( 50 ) NOT NULL);" ;
     $db->exec($sql);
     print("Created $table Table.
");

} catch(PDOException $e) {
    echo $e->getMessage();//Remove or change message in production code
}

注意回答評論使用

CREATE TABLE IF NOT EXISTS

這篇關于使用 PDO 創建表的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！