问题
I'm trying to populate a datatable with a server side PHP script which echoes the data from a postgres table (~75K rows). I followed the steps given in the datatable page and implemented it, but the table doesn't show any data. This is what I have so long:
table definition in a jsp file:
<table id="myTable" class="table table-striped" width="100%">
<thead>
<tr>
<th>idpersona</th>
<th>primerapellido</th>
<th>primernombre</th>
<th>numeroidentificacion</th>
<th>fechanacimiento</th>
</tr>
</thead>
<tfoot>
<tr>
<th>idpersona</th>
<th>primerapellido</th>
<th>primernombre</th>
<th>numeroidentificacion</th>
<th>fechanacimiento</th>
</tr>
</tfoot>
</table>
Here is my function to initialise the table. I tried for hours (I'm a newbie programmer) to find the right folder where I must place the PHP file. Right now it is in the htdocs folder of my apache server (so I can access it from /localhost/tablabd.php). Is this the right way to do it?
<script type="text/javascript" language="javascript" class="init">
$(document).ready(function() {
$('#myTable').dataTable( {
"Processing": true,
"ServerSide": true,
"sAjaxSource": "http://localhost/tablabd.php"
} );
} );
</script>
And finally the PHP script. When I type localhost/tablabd.php in my browser, all the data is fetched correctly. But when I execute my Java project, it doesn't show anything in the table 'myTable'.
<?php
/*
* Script: DataTables server-side script for PHP and PostgreSQL
* Copyright: 2010 - Allan Jardine
* License: GPL v2 or BSD (3-point)
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Easy set variables
*/
/* Array of database columns which should be read and sent back to DataTables. Use a space where
* you want to insert a non-database field (for example a counter or static image)
*/
$aColumns = array("idpersona", "primerapellido","primernombre", "numeroidentificacion", "fechanacimiento");
/* Indexed column (used for fast and accurate table cardinality) */
$sIndexColumn = '"idpersona"';
/* DB table to use */
$sTable = '"tpersonas"';
/* Database connection information */
$gaSql['user'] = "postgres";
$gaSql['password'] = "******";
$gaSql['db'] = "sisben";
$gaSql['server'] = "localhost";
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* If you just want to use the basic configuration for DataTables with PHP server-side, there is
* no need to edit below this line
*/
/*
* DB connection
*/
$gaSql['link'] = pg_connect(
" host=".$gaSql['server'].
" dbname=".$gaSql['db'].
" user=".$gaSql['user'].
" password=".$gaSql['password']
) or die('Could not connect: ' . pg_last_error());
/*
* Paging
*/
$sLimit = "";
if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
{
$sLimit = "LIMIT ".intval( $_GET['iDisplayStart'] )." OFFSET ".
intval( $_GET['iDisplayLength'] );
}
/*
* Ordering
*/
if ( isset( $_GET['iSortCol_0'] ) )
{
$sOrder = "ORDER BY ";
for ( $i=0 ; $i<intval( $_GET['iSortingCols'] ) ; $i++ )
{
if ( $_GET[ 'bSortable_'.intval($_GET['iSortCol_'.$i]) ] == "true" )
{
$sOrder .= $aColumns[ intval( $_GET['iSortCol_'.$i] ) ]."
".($_GET['sSortDir_'.$i]==='asc' ? 'asc' : 'desc').", ";
}
}
$sOrder = substr_replace( $sOrder, "", -2 );
if ( $sOrder == "ORDER BY" )
{
$sOrder = "";
}
}
/*
* Filtering
* NOTE This assumes that the field that is being searched on is a string typed field (ie. one
* on which ILIKE can be used). Boolean fields etc will need a modification here.
*/
$sWhere = "";
if ( $_GET['sSearch'] != "" )
{
$sWhere = "WHERE (";
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( $_GET['bSearchable_'.$i] == "true" )
{
$sWhere .= $aColumns[$i]." ILIKE '%".pg_escape_string( $_GET['sSearch'] )."%' OR ";
}
}
$sWhere = substr_replace( $sWhere, "", -3 );
$sWhere .= ")";
}
/* Individual column filtering */
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( $_GET['bSearchable_'.$i] == "true" && $_GET['sSearch_'.$i] != '' )
{
if ( $sWhere == "" )
{
$sWhere = "WHERE ";
}
else
{
$sWhere .= " AND ";
}
$sWhere .= $aColumns[$i]." ILIKE '%".pg_escape_string($_GET['sSearch_'.$i])."%' ";
}
}
$sQuery = "
SELECT ".str_replace(" , ", " ", implode(", ", $aColumns))."
FROM $sTable
$sWhere
$sOrder
$sLimit
";
$rResult = pg_query( $gaSql['link'], $sQuery ) or die(pg_last_error());
$sQuery = "
SELECT $sIndexColumn
FROM $sTable
";
$rResultTotal = pg_query( $gaSql['link'], $sQuery ) or die(pg_last_error());
$iTotal = pg_num_rows($rResultTotal);
pg_free_result( $rResultTotal );
if ( $sWhere != "" )
{
$sQuery = "
SELECT $sIndexColumn
FROM $sTable
$sWhere
";
$rResultFilterTotal = pg_query( $gaSql['link'], $sQuery ) or die(pg_last_error());
$iFilteredTotal = pg_num_rows($rResultFilterTotal);
pg_free_result( $rResultFilterTotal );
}
else
{
$iFilteredTotal = $iTotal;
}
/*
* Output
*/
$output = array(
"sEcho" => intval($_GET['sEcho']),
"iTotalRecords" => $iTotal,
"iTotalDisplayRecords" => $iFilteredTotal,
"aaData" => array()
);
while ( $aRow = pg_fetch_array($rResult, null, PGSQL_ASSOC) )
{
$row = array();
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( $aColumns[$i] == 'idpersona' )
{
/* Special output formatting for 'ID' column */
$row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
}
else if ( $aColumns[$i] != ' ' )
{
/* General output */
$row[] = $aRow[ $aColumns[$i] ];
}
}
$output['aaData'][] = $row;
}
echo json_encode( $output );
// Free resultset
pg_free_result( $rResult );
// Closing connection
pg_close( $gaSql['link'] );
?>
and a sample of the output of the script in the broswer: maybe I'm missing a column mapping somewhere?
{"sEcho":0,"iTotalRecords":74047,"iTotalDisplayRecords":74047,"aaData":[["e71657b3-a7f5-4a10-bc43-d0edbeb5cdab","PEREZ","ABDON","4299249","1947-07-10 00:00:00"],["796db2d4-fee3-4cca-ae06-429a2ea6c5af","TORREZ","MARIA","24240762","1951-09-17 00:00:00"]]}
Here is the info Firebug shows when I access the page on my application which contains the table:
_ 1440905636814
columns[0][data] 0
columns[0][name]
columns[0][orderable] true
columns[0][search][regex] false
columns[0][search][value]
columns[0][searchable] true
columns[1][data] 1
columns[1][name]
columns[1][orderable] true
columns[1][search][regex] false
columns[1][search][value]
columns[1][searchable] true
columns[2][data] 2
columns[2][name]
columns[2][orderable] true
columns[2][search][regex] false
columns[2][search][value]
columns[2][searchable] true
columns[3][data] 3
columns[3][name]
columns[3][orderable] true
columns[3][search][regex] false
columns[3][search][value]
columns[3][searchable] true
columns[4][data] 4
columns[4][name]
columns[4][orderable] true
columns[4][search][regex] false
columns[4][search][value]
columns[4][searchable] true
draw 1
length 20
order[0][column] 0
order[0][dir] asc
search[regex] false
search[value]
start 0
Thanks in advance.
回答1:
SOLUTION
Correct option names are bProcessing and bServerSide. Your DataTables initialization code should be:
$('#myTable').dataTable({
"bProcessing": true,
"bServerSide": true,
"sAjaxSource": "/tablabd.php"
});
NOTES
I have changed URL to /tablabd.php because if your HTML and PHP are on different domain, Ajax calls may fail unless you allow cross-domain requests. Make sure you have HTML and PHP on the same domain.
来源：https://stackoverflow.com/questions/32281489/how-to-populate-a-jquery-datatable-using-server-side-processing-php