如果不存在导入表数据的函数

Question

所以我试图让这个函数执行一个从数据库导出的.sql文件。该功能的基本作用是在所需表格为空时导入表格数据。我已经做了一个函数，检查表是否为空，但不能让这个表运行。到目前为止，我想出了这个..

function importdata($file) { 

global $wpdb; 
require_once(ABSPATH . 'wp-admin/includes/upgrade.php'); 

// Name of the file 
$plugindir = dirname(__FILE__); 
$filename = $plugindir . '/metaboxes/database/' . $file; 

// Temporary variable, used to store current query 
$templine = ''; 
// Read in entire file 
$lines = file($filename); 

// Loop through each line 
foreach ($lines as $line) 
{ 
// Skip it if it's a comment 
if (substr($line, 0, 2) == '--' || $line == '') 
continue; 

// Add this line to the current segment 
$templine .= $line; 



// If it has a semicolon at the end, it's the end of the query 
if (substr(trim($line), -1, 1) == ';') 
{ 
    // Perform the query 
    $wpdb->query('$line'); 

    // Reset temp variable to empty 
    $templine = ''; 
    echo "if is running"; 
    } 
} 
} 

我在if条件添加回声来检查它是否达到了条件。显然，它是达到如果条件，但不添加行。

Answer 1

对于那些需要为此的答案，问题是在wpdb->查询。我所做的解决这个问题的方法是用$ templine替换$ line。发生这个问题是因为$ line只有';'而其他数据存储在$ templine中。正在运行的最终功能是...

function importdata($file) { 

global $wpdb; 
require_once(ABSPATH . 'wp-admin/includes/upgrade.php'); 

// Name of the file 
$plugindir = dirname(__FILE__); 
$filename = $plugindir . '/metaboxes/database/' . $file; 

// Temporary variable, used to store current query 
$templine = ''; 
// Read in entire file 
$lines = file($filename); 

// Loop through each line 
foreach ($lines as $line) 
{ 
// Skip it if it's a comment 
if (substr($line, 0, 2) == '--' || $line == '') 
continue; 

// Add this line to the current segment 
$templine .= $line; 



// If it has a semicolon at the end, it's the end of the query 
if (substr(trim($line), -1, 1) == ';') 
{ 
    // Perform the query 
    $wpdb->query($templine); 
    // Reset temp variable to empty 
    $templine = ''; 
    echo "if is running"; 
    } 
} 
}