How to print SQL statement in codeigniter model

I have a sql statement in my model,

I then say

$query = $this->db->query($sql, array(fields, fields1);

if ($query) {
    return true:
} else {
    echo "failed";
    return false;
}

My query always fails, how do I get php to print the exact sql statement being sent to my database? A开发者_运维百科nd display that on my php view, page

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You can use this:

$this->db->last_query();

"Returns the last query that was run (the query string, not the result)."

Reff: https://www.codeigniter.com/userguide3/database/helpers.html

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To display the query string:

print_r($this->db->last_query());    

To display the query result:

print_r($query);

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The Profiler Class will display benchmark results, queries you have run, and $_POST data at the bottom of your pages. To enable the profiler place the following line anywhere within your Controller methods:

$this->output->enable_profiler(TRUE);

Profiling user guide: https://www.codeigniter.com/user_guide/general/profiling.html

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You can display the ActiveRecord generated SQL:

Before the query runs:

$this->db->_compile_select(); 

And after it has run:

$this->db->last_query(); 

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if you need a quick test on your query, this works great for me

echo $this->db->last_query(); die;

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After trying without success to use _compiled_select() or get_compiled_select() I just printed the db object, and you can see the query there in the queries property.

Try it yourself:

var_dump( $this->db );

If you know you have only one query, you can print it directly:

echo $this->db->queries[0];

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There is a new public method get_compiled_select that can print the query before running it. _compile_select is now protected therefore can not be used.

echo $this->db->get_compiled_select(); // before $this->db->get();

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You can simply use this at the end..

echo $this->db->last_query();

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In CodeIgniter4, you do this:

$db = \Config\Database::connect();  
// your queries here
$query = $db->getLastQuery();
$sql = $query->getQuery();
echo $sql;

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Neither last_query() or get_compiled_select() works for me, so a slight change of pedro's code works for me just fine. Do not include ->get() in your build, this must be before the ->get()

 echo $this->EE->db->_compile_select();

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I try to @Chumillas's answer and @chhameed's answer, but it not work,because the sql is wrong.So I found new approach,like this:

• Insert echo $sql; flush(); exit; into before return $sql; _compile_select function of DB_active_rec.php

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use get_compiled_select() to retrieve query instead of replace it

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Add this line right after the query you want to print.

Example:

$query = $this->db->query('SELECT * FROM table WHERE condition');

//Add this line.

var_dump($this->db->last_query());

exit();

or

echo $this->db->last_query();

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I'm using xdebug for watch this values in VSCode with the respective extension and CI v2.x. I add the expresion $this->db->last_query() in the watch section, and I add xdebugSettings node like these lines for get non truncate value in the launch.json.

{
  "name": "Launch currently open script",
  "type": "php",
  "request": "launch",
  "program": "${file}",
  "cwd": "${fileDirname}",
  "port": 9000,
  "xdebugSettings": {
    "max_data": -1,
    "max_children": -1
  }
},

And run my debuger with the breakpoint and finally just select my expresion and do click right > copy value.

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In codeigniter 4 I use below code to echo the query. This comes handy especially to see incorrect database queries

use CodeIgniter\Events\Events; 

// listen to the event before $builder->get() or $model->find()

Events::on('DBQuery', function($query){
    log_message('info', $query);
});

This event is triggered whenever a new query has been run, whether successful or not.

Refer official doc on DBQuery Event here.

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I read all answers here, but cannot get

echo $this->db->get_compiled_select();

to work, It gave me error like,

Call to protected method CI_DB_active_record::_compile_select() from context 'Welcome'in controllers on line xx

So i removed protected from the below line from file \system\database\DB_active_rec.php and it worked

protected function _compile_select($select_override = FALSE)

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I had exactly the same problem and found the solution eventually. My query runs like:

$result = mysqli_query($link,'SELECT * FROM clients WHERE ' . $sql_where . ' AND ' . $sql_where2 . ' ORDER BY acconame ASC ');

In order to display the sql command, all I had to do was to create a variable ($resultstring) with the exact same content as my query and then echo it, like this:<?php echo $resultstring = 'SELECT * FROM clients WHERE ' . $sql_where . ' AND ' . $sql_where2 . ' ORDER BY acconame ASC '; ?>

It works!