Cómo imprimir el sql ejecutado justo después de su ejecución

El objeto $wpdbtiene algunaspropiedades que seestán configurandoparaeso:

 global $wpdb;

// Print last SQL query string
echo $wpdb->last_query;

// Print last SQL query result
echo $wpdb->last_result;

// Print last SQL query Error
echo $wpdb->last_error;
 

Nota: Enprimer lugar,debe configurar define( 'SAVEQUERIES', true );en su archivo wp-config.phpen la carpeta raíz de WordPress.

The $wpdb object has some properties getting set for that:

global $wpdb;

// Print last SQL query string
echo $wpdb->last_query;

// Print last SQL query result
echo $wpdb->last_result;

// Print last SQL query Error
echo $wpdb->last_error;

Note: First of all you have to set define( 'SAVEQUERIES', true ); in your wp-config.php file at root folder of WordPress.

Heenumeradotresenfoques aquí:

1. Usando SAVEQUERIESe imprimiendotodas las consultasen elpie depágina
2. Usar $wpdb->last_queryparaimprimir solo la última consultaejecutada,estoes útilpara lasfunciones de depuración.
3. Usando un complemento como Query Monitor.

Debería agregarestoen su wp-config.php

  define('SAVEQUERIES', true);
 

Luego,en elpie depágina de sutema,agregueeste código:

  <?php
  if (current_user_can('administrator')){
   global $wpdb;
   echo "<pre>Query List:";
   print_r($wpdb->queries);
   echo "</pre>";
 }//Lists all the queries executed on your page
?>
 

O si deseaimprimir solo la última consultaejecutada,puede usarlajusto debajo de la llamada a lafunción de consulta $wpdb.

 global $wpdb;
echo $wpdb->last_query;//lists only single query
 

Untercerenfoque sería utilizar un complemento como Query Monitor,queenumeratodas las consultasejecutadasen unapáginaen detalle,y otros detalles asociados conella,como cuántasfilas devuelve yeltiemponecesariopara laejecución o sies lento. consulta. http://wordpress.org/plugins/query-monitor/

Es unabuenaidea usareste complemento soloen elentorno DEV yno debe dejarse activadoen un sitioen vivo. Además,Query Monitor a vecespuede causarproblemas con supágina,comoelerror 5XXen suplantilla/página si hay demasiadoserrores.

I've listed down 3 approaches in here:

1. Using SAVEQUERIES and printing all the queries in footer
2. Using $wpdb->last_query to print just the latest query executed, this is useful for debugging functions.
3. Using a plugin like Query Monitor.

You'd need to add this in your wp-config.php

 define('SAVEQUERIES', true);

Then in the footer of your theme add this code:

 <?php
  if (current_user_can('administrator')){
   global $wpdb;
   echo "<pre>Query List:";
   print_r($wpdb->queries);
   echo "</pre>";
 }//Lists all the queries executed on your page
?>

Or if you'd like to print just the last executed query, you can use this just below your $wpdb query function call.

global $wpdb;
echo $wpdb->last_query;//lists only single query

A 3rd approach would be to use a plugin like Query Monitor which lists all the queries executed on a page in detail, and other details associated with it like how many rows it returns and the time taken for execution or if it's a slow query. http://wordpress.org/plugins/query-monitor/

It's a good idea to use this plugin in DEV environment only and shouldn't be left activated on a live site. Also, Query Monitor can sometimes cause issues with your page, Like 5XX error on your template/page if there are too many errors.

Tienes que agregar ambasfunciones,de lo contrarionuncamostraráelerror

 $wpdb->show_errors(); 
$wpdb->print_error();
 

Estafunción lemostrará unerror apropiado comoeste

You have to add both functions,otherwise it will never show error

$wpdb->show_errors(); 
$wpdb->print_error();

This function will show you proper error like this this

Quería agregar que lamejor respuesta votadapor @kaisernoes completamente correcta:

 // Print last SQL query string
$wpdb->last_query
 

El resultadoes ARRAY ,no una cadena.Entonces,paragenerar la última consulta,debe haceresto:

 echo 'Last query: '.var_export($wpdb->last_query, TRUE);
 

I wanted to add that the best up-voted answer by @kaiser is not fully correct:

// Print last SQL query string
$wpdb->last_query

The return of it is ARRAY, not a string. So to output last query you should do this:

echo 'Last query: '.var_export($wpdb->last_query, TRUE);