PHP开发-最简单的数据库操作，使用ezSQL

Posted 2020-11-18 PHP飞鸟的博客

php数据库操作使用ezSQL来实现，简单好用。

如果用的是mysql数据库，将下载的ezSQL文件中的mysql和shared连个文件夹拷贝到PHP工程目录中引用即可。

在PHP文件中

// Include ezSQL core  
include_once "shared/ez_sql_core.php";  
// Include ezSQL database specific component  
include_once "mysql/ez_sql_mysql.php";  
// Initialise database object and establish a connection  
// at the same time - db_user / db_password / db_name / db_host  
include_once ("Pagination.php");  
$db = new ezSQL_mysql(‘root‘, ‘abcdef‘, ‘test_t‘, ‘localhost‘);  

使用示例：

取数值：

$var = $db->get_var("SELECT count(*) FROM users");

 

取对象：

$user = $db->get_row("SELECT name,email FROM users WHERE id = 2");

 

取数组：

$users = $db->get_results("SELECT name, email FROM users");
foreach ( $users as $user )
{
    // 使用对象语法
    echo $user->name;
    echo $user->email;
}

可以看出，其实函数返回值为二维数组，经foreach分解后，$user为每条记录的内容，可直接用$user->字段名的方式访问。

get_results()还有另一种调用方式：

 

// Extract results into the array $dogs (and evaluate if there are any results at the same time)..
if ( $dogs = $db->get_results(“SELECT breed, owner, name FROM dogs”, ARRAY_A) )
{
            // Loop through the resulting array on the index $dogs[n]
            foreach ( $dogs as $dog_detail )
            {
 
                        // Loop through the resulting array
                        foreach ( $dogs_detail as $key => $val )
                        {
                                    // Access and format data using $key and $val pairs..
                                    echo “<b>” . ucfirst($key) . “</b>: $val<br>”;
                        }
 
                        // Do a P between dogs..
                        echo “<p>”;
            }
}
else
{
            // If no users were found then if evaluates to false..
            echo “No dogs found.”;
}

 

输出结果：

Output:
Breed: Boxer
Owner: Amy
Name: Tyson

Breed: Labrador
Owner: Lee
Name: Henry

Breed: Dachshund
Owner: Mary
Name: Jasmine

 

执行Insert操作：

$db->query("INSERT INTO users (id, name, email) VALUES (NULL,‘justin‘,‘[email protected]‘)");

 

调试信息

// Display last query and all associated results

$db->debug();

四种方法：

bool	$db->query(query)
var	$db->get_var(query)
mixed	$db->get_row(query)
mixed	$db->get_results(query)

ezSQL functions

$db->get_results -- get multiple row result set from the database (or previously cached results)

$db->get_row -- get one row from the database (or previously cached results)

$db->get_col -- get one column from query (or previously cached results) based on column offset

$db->get_var -- get one variable, from one row, from the database (or previously cached results)

$db->query -- send a query to the database (and if any results, cache them)

$db->debug -- print last sql query and returned results (if any)

$db->vardump -- print the contents and structure of any variable

$db->select -- select a new database to work with

$db->get_col_info -- get information about one or all columns such as column name or type

$db->hide_errors -- turn ezSQL error output to browser off

$db->show_errors -- turn ezSQL error output to browser on

$db->escape -- Format a string correctly to stop accidental mal formed queries under all PHP conditions

$db = new db -- Initiate new db object.

 

ezSQL variables

$db->num_rows – Number of rows that were returned (by the database) for the last query (if any)

$db->insert_id -- ID generated from the AUTO_INCRIMENT of the previous INSERT operation (if any)

$db->rows_affected -- Number of rows affected (in the database) by the last INSERT, UPDATE or DELETE (if any)

$db->num_queries -- Keeps track of exactly how many ‘real‘ (not cached) queries were executed during the lifetime of the current script

$db->debug_all – If set to true (i.e. $db->debug_all = true;) Then it will print out ALL queries and ALL results of your script.

$db->cache_dir – Path to mySQL caching dir.

$db->cache_queries – Boolean flag (see mysql/disk_cache_example.php)

$db->cache_inserts – Boolean flag (see mysql/disk_cache_example.php)

$db->use_disk_cache – Boolean flag (see mysql/disk_cache_example.php)

$db->cache_timeout – Number in hours (see mysql/disk_cache_example.php)