Php 需要了解mysql左连接和数据表的帮助吗
我正试着让我的头脑清醒过来。我从网上的信息中学到了很多,但我还是有点难以理解连接是如何工作的,以及如何融入到DataTables代码中 我有这个表结构:Php 需要了解mysql左连接和数据表的帮助吗,php,mysql,join,database-table,Php,Mysql,Join,Database Table,我正试着让我的头脑清醒过来。我从网上的信息中学到了很多,但我还是有点难以理解连接是如何工作的,以及如何融入到DataTables代码中 我有这个表结构: SELECT leads.lead_id, leads.date_time, clients.username, courses.course_type, courses.location_name, CONCAT(first_name,' ',surname) FROM courses LEFT JOIN leads ON leads.lea
SELECT leads.lead_id, leads.date_time, clients.username, courses.course_type, courses.location_name, CONCAT(first_name,' ',surname)
FROM courses
LEFT JOIN leads ON leads.lead_get_course_id = courses.course_id
LEFT JOIN clients ON clients.client_id = courses.course_get_client_id
WHERE leads.checked_by_admin = 'No'
<?php
/*
* Script: DataTables server-side script for PHP and MySQL
* 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(
"leads.lead_id",
"leads.date_time",
"clients.username",
"courses.course_type",
"courses.location_name",
"CONCAT(first_name,' ',surname)"
);
/* Indexed column (used for fast and accurate table cardinality) */
$sIndexColumn = "leads.lead_id";
/* DB table to use */
$sTable = "courses";
$sJoin = 'LEFT JOIN leads ON leads.lead_get_course_id = courses.course_id';
$sJoin = 'LEFT JOIN clients ON clients.client_id = courses.course_get_client_id';
/* Database connection information */
$gaSql['user'] = "root";
$gaSql['password'] = "tommy";
$gaSql['db'] = "testingsiasite";
$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
*/
/*
* MySQL connection
*/
$gaSql['link'] = mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password'] ) or
die( 'Could not open connection to server' );
mysql_select_db( $gaSql['db'], $gaSql['link'] ) or
die( 'Could not select database '. $gaSql['db'] );
/*
* Paging
*/
$sLimit = "";
if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
{
$sLimit = "LIMIT ".mysql_real_escape_string( $_GET['iDisplayStart'] ).", ".
mysql_real_escape_string( $_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] ) ]."
".mysql_real_escape_string( $_GET['sSortDir_'.$i] ) .", ";
}
}
$sOrder = substr_replace( $sOrder, "", -2 );
if ( $sOrder == "ORDER BY" )
{
$sOrder = "";
}
}
/*
* Filtering
* NOTE this does not match the built-in DataTables filtering which does it
* word by word on any field. It's possible to do here, but concerned about efficiency
* on very large tables, and MySQL's regex functionality is very limited
*/
/* */
/* */
$sWhere = "";
if ( isset($_GET['sSearch']) && $_GET['sSearch'] != "" )
{
$sWhere = "WHERE (";
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
$sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $_GET['sSearch'] )."%' OR ";
}
$sWhere = substr_replace( $sWhere, "", -3 );
$sWhere .= " AND checked_by_admin='No'";
$sWhere .= ')';
}else{
$sWhere = "WHERE checked_by_admin='No'";
}
/* 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]." LIKE '%".mysql_real_escape_string($_GET['sSearch_'.$i])."%' ";
}
}
/*
* SQL queries
* Get data to display
*/
if($sWhere != ""):
$sWhere .= " AND checked_by_admin='No'";
endif;
$sQuery = "
SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
FROM $sTable
$sJoin
$sWhere
$sOrder
$sLimit
";
$rResult = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
/* Data set length after filtering */
$sQuery = "
SELECT FOUND_ROWS()
";
$rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
$aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
$iFilteredTotal = $aResultFilterTotal[0];
/* Total data set length */
$sQuery = "
SELECT COUNT(".$sIndexColumn.")
FROM $sTable
";
$rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
$aResultTotal = mysql_fetch_array($rResultTotal);
$iTotal = $aResultTotal[0];
/*
* Output
*/
$output = array(
"sEcho" => intval($_GET['sEcho']),
"iTotalRecords" => $iFilteredTotal, // HERE FOR MASK TOTAL ENTRY not necerrary for others customers
"iTotalDisplayRecords" => $iFilteredTotal,
"aaData" => array()
);
while ( $aRow = mysql_fetch_array( $rResult ) )
{
$row = array();
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( $aColumns[$i] == "version" )
{
/* Special output formatting for 'version' column */
$row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
}
else if ( $aColumns[$i] != ' ' )
{
/* General output */
$row[] = $aRow[ $aColumns[$i] ];
}
}
$row[] = "<span style='cursor:pointer'><img src='../images/more-info.png' alt='more info' onClick='javascript:my_onclick({$row[0]});'/></span>";
$row[] = "<a href='../leads/actions/approve-lead.php?lead_id={$row[0]}'><img src='../images/approve.png' alt='' /></a>";
$row[] = "<a href='../leads/actions/delete-lead.php?lead_id={$row[0]}' class='delete_link'><img src='../images/delete.png' alt='' /></a>";
$output['aaData'][] = $row;
}
echo json_encode( $output );
?>
这个MySql语句:
SELECT leads.lead_id, leads.date_time, clients.username, courses.course_type, courses.location_name, CONCAT(first_name,' ',surname)
FROM courses
LEFT JOIN leads ON leads.lead_get_course_id = courses.course_id
LEFT JOIN clients ON clients.client_id = courses.course_get_client_id
WHERE leads.checked_by_admin = 'No'
<?php
/*
* Script: DataTables server-side script for PHP and MySQL
* 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(
"leads.lead_id",
"leads.date_time",
"clients.username",
"courses.course_type",
"courses.location_name",
"CONCAT(first_name,' ',surname)"
);
/* Indexed column (used for fast and accurate table cardinality) */
$sIndexColumn = "leads.lead_id";
/* DB table to use */
$sTable = "courses";
$sJoin = 'LEFT JOIN leads ON leads.lead_get_course_id = courses.course_id';
$sJoin = 'LEFT JOIN clients ON clients.client_id = courses.course_get_client_id';
/* Database connection information */
$gaSql['user'] = "root";
$gaSql['password'] = "tommy";
$gaSql['db'] = "testingsiasite";
$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
*/
/*
* MySQL connection
*/
$gaSql['link'] = mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password'] ) or
die( 'Could not open connection to server' );
mysql_select_db( $gaSql['db'], $gaSql['link'] ) or
die( 'Could not select database '. $gaSql['db'] );
/*
* Paging
*/
$sLimit = "";
if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
{
$sLimit = "LIMIT ".mysql_real_escape_string( $_GET['iDisplayStart'] ).", ".
mysql_real_escape_string( $_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] ) ]."
".mysql_real_escape_string( $_GET['sSortDir_'.$i] ) .", ";
}
}
$sOrder = substr_replace( $sOrder, "", -2 );
if ( $sOrder == "ORDER BY" )
{
$sOrder = "";
}
}
/*
* Filtering
* NOTE this does not match the built-in DataTables filtering which does it
* word by word on any field. It's possible to do here, but concerned about efficiency
* on very large tables, and MySQL's regex functionality is very limited
*/
/* */
/* */
$sWhere = "";
if ( isset($_GET['sSearch']) && $_GET['sSearch'] != "" )
{
$sWhere = "WHERE (";
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
$sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $_GET['sSearch'] )."%' OR ";
}
$sWhere = substr_replace( $sWhere, "", -3 );
$sWhere .= " AND checked_by_admin='No'";
$sWhere .= ')';
}else{
$sWhere = "WHERE checked_by_admin='No'";
}
/* 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]." LIKE '%".mysql_real_escape_string($_GET['sSearch_'.$i])."%' ";
}
}
/*
* SQL queries
* Get data to display
*/
if($sWhere != ""):
$sWhere .= " AND checked_by_admin='No'";
endif;
$sQuery = "
SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
FROM $sTable
$sJoin
$sWhere
$sOrder
$sLimit
";
$rResult = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
/* Data set length after filtering */
$sQuery = "
SELECT FOUND_ROWS()
";
$rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
$aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
$iFilteredTotal = $aResultFilterTotal[0];
/* Total data set length */
$sQuery = "
SELECT COUNT(".$sIndexColumn.")
FROM $sTable
";
$rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
$aResultTotal = mysql_fetch_array($rResultTotal);
$iTotal = $aResultTotal[0];
/*
* Output
*/
$output = array(
"sEcho" => intval($_GET['sEcho']),
"iTotalRecords" => $iFilteredTotal, // HERE FOR MASK TOTAL ENTRY not necerrary for others customers
"iTotalDisplayRecords" => $iFilteredTotal,
"aaData" => array()
);
while ( $aRow = mysql_fetch_array( $rResult ) )
{
$row = array();
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( $aColumns[$i] == "version" )
{
/* Special output formatting for 'version' column */
$row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
}
else if ( $aColumns[$i] != ' ' )
{
/* General output */
$row[] = $aRow[ $aColumns[$i] ];
}
}
$row[] = "<span style='cursor:pointer'><img src='../images/more-info.png' alt='more info' onClick='javascript:my_onclick({$row[0]});'/></span>";
$row[] = "<a href='../leads/actions/approve-lead.php?lead_id={$row[0]}'><img src='../images/approve.png' alt='' /></a>";
$row[] = "<a href='../leads/actions/delete-lead.php?lead_id={$row[0]}' class='delete_link'><img src='../images/delete.png' alt='' /></a>";
$output['aaData'][] = $row;
}
echo json_encode( $output );
?>
当我在dreamweaver中测试它时,一切正常,但是当我尝试将其应用于DataTables代码时,我在“字段列表”中得到未知列“leads.lead\u id”
这是我的数据表代码:
SELECT leads.lead_id, leads.date_time, clients.username, courses.course_type, courses.location_name, CONCAT(first_name,' ',surname)
FROM courses
LEFT JOIN leads ON leads.lead_get_course_id = courses.course_id
LEFT JOIN clients ON clients.client_id = courses.course_get_client_id
WHERE leads.checked_by_admin = 'No'
<?php
/*
* Script: DataTables server-side script for PHP and MySQL
* 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(
"leads.lead_id",
"leads.date_time",
"clients.username",
"courses.course_type",
"courses.location_name",
"CONCAT(first_name,' ',surname)"
);
/* Indexed column (used for fast and accurate table cardinality) */
$sIndexColumn = "leads.lead_id";
/* DB table to use */
$sTable = "courses";
$sJoin = 'LEFT JOIN leads ON leads.lead_get_course_id = courses.course_id';
$sJoin = 'LEFT JOIN clients ON clients.client_id = courses.course_get_client_id';
/* Database connection information */
$gaSql['user'] = "root";
$gaSql['password'] = "tommy";
$gaSql['db'] = "testingsiasite";
$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
*/
/*
* MySQL connection
*/
$gaSql['link'] = mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password'] ) or
die( 'Could not open connection to server' );
mysql_select_db( $gaSql['db'], $gaSql['link'] ) or
die( 'Could not select database '. $gaSql['db'] );
/*
* Paging
*/
$sLimit = "";
if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
{
$sLimit = "LIMIT ".mysql_real_escape_string( $_GET['iDisplayStart'] ).", ".
mysql_real_escape_string( $_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] ) ]."
".mysql_real_escape_string( $_GET['sSortDir_'.$i] ) .", ";
}
}
$sOrder = substr_replace( $sOrder, "", -2 );
if ( $sOrder == "ORDER BY" )
{
$sOrder = "";
}
}
/*
* Filtering
* NOTE this does not match the built-in DataTables filtering which does it
* word by word on any field. It's possible to do here, but concerned about efficiency
* on very large tables, and MySQL's regex functionality is very limited
*/
/* */
/* */
$sWhere = "";
if ( isset($_GET['sSearch']) && $_GET['sSearch'] != "" )
{
$sWhere = "WHERE (";
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
$sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $_GET['sSearch'] )."%' OR ";
}
$sWhere = substr_replace( $sWhere, "", -3 );
$sWhere .= " AND checked_by_admin='No'";
$sWhere .= ')';
}else{
$sWhere = "WHERE checked_by_admin='No'";
}
/* 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]." LIKE '%".mysql_real_escape_string($_GET['sSearch_'.$i])."%' ";
}
}
/*
* SQL queries
* Get data to display
*/
if($sWhere != ""):
$sWhere .= " AND checked_by_admin='No'";
endif;
$sQuery = "
SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
FROM $sTable
$sJoin
$sWhere
$sOrder
$sLimit
";
$rResult = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
/* Data set length after filtering */
$sQuery = "
SELECT FOUND_ROWS()
";
$rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
$aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
$iFilteredTotal = $aResultFilterTotal[0];
/* Total data set length */
$sQuery = "
SELECT COUNT(".$sIndexColumn.")
FROM $sTable
";
$rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
$aResultTotal = mysql_fetch_array($rResultTotal);
$iTotal = $aResultTotal[0];
/*
* Output
*/
$output = array(
"sEcho" => intval($_GET['sEcho']),
"iTotalRecords" => $iFilteredTotal, // HERE FOR MASK TOTAL ENTRY not necerrary for others customers
"iTotalDisplayRecords" => $iFilteredTotal,
"aaData" => array()
);
while ( $aRow = mysql_fetch_array( $rResult ) )
{
$row = array();
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( $aColumns[$i] == "version" )
{
/* Special output formatting for 'version' column */
$row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
}
else if ( $aColumns[$i] != ' ' )
{
/* General output */
$row[] = $aRow[ $aColumns[$i] ];
}
}
$row[] = "<span style='cursor:pointer'><img src='../images/more-info.png' alt='more info' onClick='javascript:my_onclick({$row[0]});'/></span>";
$row[] = "<a href='../leads/actions/approve-lead.php?lead_id={$row[0]}'><img src='../images/approve.png' alt='' /></a>";
$row[] = "<a href='../leads/actions/delete-lead.php?lead_id={$row[0]}' class='delete_link'><img src='../images/delete.png' alt='' /></a>";
$output['aaData'][] = $row;
}
echo json_encode( $output );
?>
好吧,连接不能与php代码一起使用。即使在我最终决定创建自己的连接类来使用datatable之前,我也不得不与同样的情况作斗争,我正在考虑修改它以供每个人使用并发布它。但既然你现在面临的问题是我提出的这个类,它对我来说没有任何缺陷,虽然目前不是完美的状态,但我给出的代码可能会对你有所帮助
class DataTable {
protected $_sTable;
protected $_aColumns = array();
protected $_sJoin = '';
protected $_sWhere_0 = '';
protected $_sGroupBy = '';
protected $_sIndexColumn = 'id';
protected $_iFilteredTotal;
protected $_iTotal;
protected $_iResult;
protected static $_dbh;
public function __construct($sTable, array $aColumns, $sJoin = '', $sWhere_0 = '', $sGroupBy = '', $sIndexColumn = '') {
//This is PDO object for database connection.
if(!isset(self::$_dbh)) self::$_dbh = Config_Database::getInstance();
$this->_sTable = $sTable;
$this->_aColumns = $aColumns;
if($sJoin != '') $this->_sJoin = $sJoin;
if($sWhere_0 != '') $this->_sWhere_0 = $sWhere_0;
if($sGroupBy != '') $this->_sGroupBy = $sGroupBy;
if($sIndexColumn != '') $this->_sIndexColumn = $sIndexColumn;
$this->sQuery();
}
protected function sLimit() {
if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' ) {
$sLimit = ' LIMIT ' . intval($_GET['iDisplayStart']) . ', ' . intval($_GET['iDisplayLength']);
} else {
$sLimit = '';
}
return $sLimit;
}
protected function sOrder() {
$sOrder = '';
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 .= $this->_aColumns[ intval( $_GET['iSortCol_'.$i] ) ].' '.$_GET['sSortDir_'.$i] .', ';
}
}
$sOrder = substr_replace( $sOrder, '', -2 );
if ( $sOrder == ' ORDER BY' ) {
$sOrder = '';
}
}
return $sOrder;
}
protected function sWhere() {
$sWhere = '';
if ( $_GET['sSearch'] != '' ) {
$sWhere = ' WHERE (';
for ( $i=0 ; $i<count($this->_aColumns) ; $i++ ) {
if ( $_GET['bSearchable_'.$i] == "true" ) {
$sWhere .= $this->_aColumns[$i]." LIKE '%". $_GET['sSearch'] ."%' OR ";
}
}
$sWhere = substr_replace( $sWhere, "", -3 );
$sWhere .= ')';
}
/* Conditions */
if($this->_sWhere_0 != '') {
if($sWhere != '') {
$sWhere .= ' AND '.$this->_sWhere_0;
} else {
$sWhere .= ' WHERE '.$this->_sWhere_0;
}
}
/* Individual column filtering */
for ( $i=0 ; $i<count($this->_aColumns) ; $i++ ) {
if ( $_GET['bSearchable_'.$i] == "true" && $_GET['sSearch_'.$i] != '' ) {
if ( $sWhere == '' ) {
$sWhere = 'WAHERE ';
} else {
$sWhere .= ' AND ';
}
$sWhere .= $this->_aColumns[$i]." LIKE '%".$_GET['sSearch_'.$i]."%' ";
}
}
return $sWhere;
}
protected function sQuery() {
$sQuery = "SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $this->_aColumns)).' FROM '.
$this->_sTable.
$this->_sJoin.
$this->sWhere().
$this->_sGroupBy.
$this->sOrder().
$this->sLimit();
$sth = self::$_dbh->query($sQuery);
$this->_iResult = $sth->fetchAll(PDO::FETCH_NUM);
/* Data set length after filtering */
$sQuery = 'SELECT FOUND_ROWS()';
$sth = self::$_dbh->query($sQuery);
$aResultFilterTotal = $sth->fetchAll(PDO::FETCH_NUM);
$this->_iFilteredTotal = $aResultFilterTotal[0][0];
/* Total data set length */
$sQuery = 'SELECT COUNT('.$this->_sIndexColumn.') FROM '.$this->_sTable;
$sth = self::$_dbh->query($sQuery);
$aResultTotal = $sth->fetchAll(PDO::FETCH_NUM);
$this->_iTotal = $aResultTotal[0][0];
return $this;
}
public function aaData() {
$output = array(
"sEcho" => intval($_GET['sEcho']),
"iTotalRecords" => $this->_iTotal,
"iTotalDisplayRecords" => $this->_iFilteredTotal,
"aaData" => array()
);
return $output;
}
public function iResult() {
return $this->_iResult;
}
}
我的代码可以处理任意数量的表中的任意数量的连接,但它仍然有一些限制,我需要在有时间时处理这些限制
希望对你有用:)
更新:以下是您应该为代码做的操作。
//Create new PDO connection.
$host = 'localhoost';
$database = 'database';
$username = 'username';
$password = 'password';
$sDatabase = new PDO('mysql:host='.$host.';dbname='.$database,$username,$password);
//for the database to work with the class change the code in constructor with the below one.
public function __construct($sDatabase, $sTable, array $aColumns, $sJoin = '', $sWhere_0 = '', $sGroupBy = '', $sIndexColumn = '') {
if(!isset(self::$_dbh)) self::$_dbh = $sDatabase;
$this->_sTable = $sTable;
$this->_aColumns = $aColumns;
if($sJoin != '') $this->_sJoin = $sJoin;
if($sWhere_0 != '') $this->_sWhere_0 = $sWhere_0;
if($sGroupBy != '') $this->_sGroupBy = $sGroupBy;
if($sIndexColumn != '') $this->_sIndexColumn = $sIndexColumn;
$this->sQuery();
}
//Datatable config and instance.
$sTable = 'courses';
$aColumns = array(
"leads.lead_id",
"leads.date_time",
"clients.username",
"courses.course_type",
"courses.location_name",
"CONCAT(first_name,' ',surname) as full_name"
);
$sJoin = ' LEFT JOIN leads ON leads.lead_get_course_id = courses.course_id';
$sJoin .= ' LEFT JOIN clients ON clients.client_id = courses.course_get_client_id';
$sWhere = "checked_by_admin='No'";
$dataTable = new DataTable($sDatabase, $sTable, $aColumns, $sJoin, $sWhere);
$output = $dataTable->aaData();
$iResult = $dataTable->iResult();
$output['aaData'] = $iResult;
echo json_encode($output);
如果您仍然有任何问题,请告诉我。从lead中选择lead.lead\u id会发生什么情况。
?您是否尝试了“lead\u id”而不是“lead.lead\u id”?顺便说一句,外键通常被命名为“lead\u id”。因此,为了简单起见,courses.courses\u get\u client\u id
可以命名为courses.client\u id
。应该完整简洁——足以重现问题,但仅此而已。考虑选择A。这样做的一个好处是其他人可以使用,您将收到一个通知,说明有人在评论中对您进行了回复。看起来很棒,非常感谢您分享。我现在正在尝试实现它,但是正在努力改变什么:foreach($iResult as$k=>$v){$iResult[$k][3]=//用您喜欢的任何内容更改第二行。}还有一点不确定如何将我的db连接详细信息添加到类中,谢谢您的时间。@masterboy,那里没有必要更改任何内容,有时,我们想显示图像,或显示href属性或一些html代码,这就是foreach的用途,如果您不想更改任何内容,您可以将其保留为空或删除该foreach。立即获取,谢谢!我收到这个错误类'Config_Database'没有找到非常感谢您的帮助,但是我找到了一种使用这个编辑脚本的方法: