问题
How can I get Datatables Server-Side Processing script to work with a custom query? I need to select columns from multiple tables and have Datatables render them.
Datatables.net's Server-Side Processing (SSP) with PHP is summarized here: https://datatables.net/examples/server_side/simple.html
I found this SO question, but the original poster never provided his solution. I don't have sufficient reputation to ask him to provide more detail.
Here is my raw SQL without using Datatable's SSP
SELECT tbl_houses.style, tbl_houses.roomCount, tbl_residents.firstName, tbl_residents.lastName
FROM tbl_houses, tbl_residents
WHERE tbl_houses.houseID = tbl_residents.residentID
/*
* # Equivalent query using JOIN suggested by @KumarRakesh
* # Note: JOIN ... ON is a synonym for INNER JOIN ... ON
* # Using JOIN conforms to syntax spec'd by ANSI-92 https://stackoverflow.com/a/894855/946957
*
* SELECT tbl_houses.style, tbl_houses.roomCount, tbl_residents.firstName, tbl_residents.lastName
* FROM tbl_houses
* JOIN tbl_residents ON tbl_houses.houseID = tbl_residents.residentID
*/
How can I get Datatables to run queries off the above using SSP?
It appears server_processing.php only accepts 1 table and no custom filtering (i.e., WHERE clauses).
// DB table to use
$table = 'datatables_demo';
// Table's primary key
$primaryKey = 'id';
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* If you just want to use the basic configuration for DataTables with PHP
* server-side, there is no need to edit below this line.
*/
require( 'ssp.class.php' );
echo json_encode(
SSP::simple( $_GET, $sql_details, $table, $primaryKey, $columns )
);
However, ssp.class.php does support filtering using WHERE. I'm thinking I need to modify ssp.class.php to force in my WHERE clause
UPDATE
Found a solution. Will post when I have free time.
回答1:
SOLUTION
Class ssp.class.php doesn't support joins and sub-queries, but there is a workaround. The trick is to use sub-query as shown below in $table definition. Replace table with your actual table name in the sub-query.
$table = <<<EOT
(
SELECT
a.id,
a.name,
a.father_id,
b.name AS father_name
FROM table a
LEFT JOIN table b ON a.father_id = b.id
) temp
EOT;
$primaryKey = 'id';
$columns = array(
array( 'db' => 'id', 'dt' => 0 ),
array( 'db' => 'name', 'dt' => 1 ),
array( 'db' => 'father_id', 'dt' => 2 ),
array( 'db' => 'father_name', 'dt' => 3 )
);
$sql_details = array(
'user' => '',
'pass' => '',
'db' => '',
'host' => ''
);
require( 'ssp.class.php' );
echo json_encode(
SSP::simple( $_GET, $sql_details, $table, $primaryKey, $columns )
);
You also need to edit ssp.class.php and replace all instances of FROM `$table` with FROM $table to remove backticks.
Make sure all column names are unique otherwise use AS to assign an alias.
NOTES
There is also github.com/emran/ssp repository that contains enhanced ssp.class.php supporting JOINs.
LINKS
See jQuery DataTables: Using WHERE, JOIN and GROUP BY with ssp.class.php for more information.
回答2:
TL;DR: I ended up using a modification of the original Datatables ssp.class.php called ssp.php implemented by Emran Ul Hadi: https://github.com/emran/ssp
His modification accepts JOIN, WHERE, GROUP BY and column aliases. Although the file hasn't been updated in over a year, it still works with DataTables 1.12.x. I made some modifications to his version that increases its robustness and improves the documentation with clearer examples.
Will post my mods/updates here when I have a bit more time. Eventually I hope to put in a pull-request to get my updates into his repository.
回答3:
It looks like the scripts from DataTables are indeed not designed for your particular use case. But there is a method that allows for custom where clauses and from reading the source of ssp.class.php#complex I think that this configuration should work for your by using the WHERE method. The JOIN method will not work here.
Long story short: edit your server_processing.php to that:
<?php
// DB table to use
$table = 'tbl_houses, tbl_residents';
// First table's primary key
$primaryKey = 'tbl_houses.id';
$columns = [
[ 'db' => 'tbl_houses.style'],
[ 'db' => 'bl_houses.roomCount'],
[ 'db' => 'tbl_residents.firstName'],
[ 'db' => 'tbl_residents.lastName']
);
// connection details
$sql_details = [
];
$whereAll = 'tbl_houses.houseID = tbl_residents.residentID';
require( 'ssp.class.php' );
echo json_encode(
SSP::complex( $_GET, $sql_details, $table, $primaryKey, $columns , null, $whereAll);
);
The complex method accepts your custom WHERE clause. But the tricky thing is the usage of 2 tables. This is what the script does not seem to be designed for. I took a look on how it is building the final sql query and it appears that you may just use this table_name.field_name notation in the config, as well as the table_name, table_name notation for the $table and $primaryKey variables.
As mentioned, the usage of 2 tables is not intended by the DataTables script. I don't know if all features of DataTables will work with that.
回答4:
My fork of the original Datatables ssp.class.php: https://github.com/emayskiy/Datatables-SSP-MultiTables
You can alias tables and columns, use where, use [LEFT, INNER, RIGHT, CROSS] JOIN with tables. Example server_processing.php:
<?php
//For one table:
//$table = "main_table_name";
//Or for multitable queries:
$table = array(
array('table'=>'main_table_name', 'as'=>'mt'),
array('table'=>'join1_table_name', 'as'=>'jt1', 'join_type'=>'INNER', 'join_on'=>'mt.field = jt1.field'),
array('table'=>'join2_table_name', 'as'=>'jt2', 'join_type'=>'LEFT', 'join_on'=>'mt.field1 = jt2.field')
);
//Columns definition with alias
$columns = array(
array( 'db' => 'mt.field1', 'dt' => 0 ),
array( 'db' => 'mt.field2', 'dt' => 1 ),
array( 'db' => 'mt.name', 'as'=>'field3', 'dt' => 2 ),
array( 'db' => 'jt1.field1', 'as'=>'field4', 'dt' => 3 ),
array( 'db' => 'jt2.field5', 'as'=>'field5', 'dt' => 4 )
);
$primaryKey = 'mt.id'; //Primary key, for check records count
$sql_details = array(
'user' => $db_user,
'pass' => $db_password,
'db' => $db_name,
'host' => $db_host
);
$where = "mt.field1 > 10"; //You SQL where condition
require('ssp.class.php' ); //File from github.com/emayskiy/Datatables-SSP-MultiTables
echo json_encode(
// All params same as in original class SSP
SSP::complex( $_GET, $sql_details, $table, $primaryKey, $columns , '', $where)
);
?>
回答5:
Sorry to be late, but I was able to solve the problem by building my own server side file, that way I can customize both queries and json outputs.
File serverSide custom:
public function produtosEstoque($arr)
{
//COLUNAS
$column = array('prodNome', 'prodPreco', 'prodQtdEst', 'categDescricao');
//SQL
$query2 = "SELECT a.prodID, a.prodNome, a.prodMedida, a.prodPrecoAnt, a.prodPreco, a.prodCategoriaID, a.prodOferta,a.prodQtdEst, a.prodQtdMEst, b.categDescricao FROM produtos a INNER JOIN categoria b ON a.prodCategoriaID = b.categID WHERE a.prodEstatusID = 6 ";
//SEARCH
if ($arr['search']['value']) {
$query2 .= "AND prodNome LIKE '%".$arr['search']['value']."%' ";
}
//ORDER
if (isset($arr['order'])) {
$query2 .= 'ORDER BY ' . $column[$arr['order']['0']['column']] . ' ' . $arr['order']['0']['dir'] . ' ';
} else {
$query2 .= 'ORDER BY a.prodID DESC ';
}
//LIMIT
if ($arr["length"] != -1) {
$query3 = 'LIMIT ' . $arr['start'] . ', ' . $arr['length'];
}
try {
//TOTAL DE REGISTROS NA TABELA
$query1 = "SELECT * FROM produtos WHERE prodEstatusID = 6";
$stm1 = $this->pdo->prepare($query1);
$stm1->execute();
$contReg = $stm1->rowCount($stm1);
$stm = $this->pdo->prepare($query2);
$stm->execute();
$number_filter_row = $stm->rowCount($stm);
$stm = $this->pdo->prepare($query2 . $query3);
$stm->execute();
$list = $stm->fetchAll(PDO::FETCH_OBJ);
$data = [];
foreach ($list as $row) {
$data[] = array('prod_nome' => $row->prodNome . ", " . $row->prodMedida, 'prod_preco' => "R$ ".$this->convInReal($row->prodPreco)." ".$this->formatProdOff($row->prodOferta), 'prod_estoque' => $row->prodQtdEst . " - M: " . $row->prodQtdMEst, 'prod_categoria' => $row->categDescricao);
}
$dat = array('draw' => intval($arr["draw"]),
'recordsTotal' => $contReg,
'recordsFiltered' => $number_filter_row,
'data' => $data
);
return json_encode($dat, JSON_UNESCAPED_UNICODE);
} catch (PDOException $erro) {
$data = array('msgEr' => 'ERR_002_EI', 'erroLine' => $erro->getLine());
return json_encode($data);
}
}
来源：https://stackoverflow.com/questions/39183330/datatables-php-server-side-processing-on-multiple-tables