我制作了一个JS脚本，从Postgres数据库中提取数据，并将它们可视化为一堆漂亮的Google Charts。这工作正常，但它很慢，有时网页只是超时。
为了解决这个问题，我考虑将图表创建为PNG / GIF / SVG / Whatever，并使用cron作业以特定间隔刷新图表。这会牺牲交互性（在这种情况下这不是非常重要）的速度。但是，Google搜索并未提供使用PHP创建Google图表的明确途径。有什么建议？
这是我的JS脚本：
google.setOnLoadCallback(drawManyCharts);
function drawManyCharts()
//parameters are: timeUnit, target div, abscissa bins, MultiplicationFactor, Graphtype, SensorString
{drawAllCharts("minutes", "GoogleChart_div", 500, 0.01, "Linechart", "Temperature");
drawAllCharts("hours", "GoogleChart2_div", 400, 0.01, "Linechart", "Temperature");
drawAllCharts("days", "GoogleChart3_div", 48, 0.01, "Linechart", "Temperature");
drawAllCharts("weeks", "GoogleChart4_div", 48, 0.01, "Linechart", "Temperature");
drawAllCharts("hours", "GoogleChartPressure_div", 48, 0.01, "Linechart", "Pressure");
}
function drawAllCharts(TimeUnit, containerChart, NoAbscissaBins, MultiplicationFactor, Graphtype, SensorString)
{
// var SensorString="Temperature";
var TableType="integer";
// var NoAbscissaBins=12;
var DataTableName="dataMasterTable";
// var TimeUnit="days";
var TimeStart="test";
// var Graphtype="Linechart";
var graphtitle = "Heizungskeller";
var OrdinateLabel = "Temperature (Celsius 100x)"
var maxViewWindow= 8000;
var minViewWindow= 0;
var GoogleArray = $.ajax({
url: "/php/PrepareGoogleDataTable.php" +"?"+
"SensorString="+SensorString + "&"+
"TableType=" + TableType +"&"+
"NoAbscissaBins=" + NoAbscissaBins + "&"+
"MultiplicationFactor=" + MultiplicationFactor + "&"+
"DataTableName=" + DataTableName +"&"+
"TimeUnit=" + TimeUnit +"&"+
"TimeStart=" + TimeStart,
//dataType:"json",
async: false
}).responseText;
console.log(GoogleArray);
GoogleArray = JSON.parse(GoogleArray);
eval(GoogleArray.GoogleAddColumns);
eval(GoogleArray.GoogleAddRows);
//create dynamic dataview for charts
//columns as specified by TableType
switch (TableType)
{
case "boolean":
eval(GoogleArray.GoogleVisualizeColumnCount) ;
break;
case "integer" :
eval(GoogleArray.GoogleVisualizeColumnsMinStdevStdevMax) ;
eval(GoogleArray.GoogleVisualizeColumnsAvg) ;
break;
case "float" :
eval(GoogleArray.GoogleVisualizeColumnsMinStdevStdevMax) ;
eval(GoogleArray.GoogleVisualizeColumnsAvg) ;
break;
case "string" :
break;
}
switch (Graphtype)
{
case "Candlestick":
var optionsCandlestick = {
width: '100%',
height: 480,
bar:{groupWidth: '90%'},
vAxis: {minValue: 0,
baseline: 0,
textStyle: {color: 'blue',
fontSize: 10},
viewWindowMode: 'explicit',
viewWindow: {max: maxViewWindow,
min: minViewWindow
}
},
hAxis: {textStyle:
{color: 'blue',
fontSize: 10},
},
pointSize: 5,
title: graphtitle
};
var wrapper = new google.visualization.ChartWrapper(
{chartType: 'CandlestickChart',
dataTable: dataViewMinStdevStdevMax,
options: optionsCandlestick,
containerId: containerChart});
wrapper.draw();
break;
case "StackedColumn":
var optionsColumnchart = {
chartArea: {width: '80%', height: '70%'},
//legend: {position: 'in'},
//titlePosition: 'in',
axisTitlesPosition: 'in',
hAxis: {textPosition: 'in'},
vAxis: {textPosition: 'in'},
width: '100%',
height: 520,
isStacked: true,
pointSize: 3,
fontSize: 10,
backgroundColor: 'transparent',
bar:{groupWidth: '90%'},
hAxis:{slantedTextAngle: 90},
legend:{position: 'in', textStyle: {color: 'blue', fontSize: 12}},
title: graphtitle
};
var wrapper = new google.visualization.ChartWrapper(
{chartType: 'ColumnChart',
dataTable: dataViewCount,
options: optionsColumnchart,
containerId: containerChart});
wrapper.draw();
break;
case "Linechart":
//these are the customizable options from google
var optionsLinechart = {
chartArea: {width: '80%', height: '70%'},
//legend: {position: 'in'},
width: 1000,
height: 480,
pointSize: 0,
title: graphtitle,
vAxis: {title: OrdinateLabel}
};
var wrapper = new google.visualization.ChartWrapper(
{chartType: 'LineChart',
dataTable: dataViewAvg,
options: optionsLinechart,
containerId: containerChart});
wrapper.draw();
break;
}
}
</script>
这是PHP脚本，它接收Postgres数据并将其转换为Google Chart易消化格式：
<?php
if(isset($_GET['SensorString']) &&
(!empty($_GET['SensorString'])) &&
(!empty($_GET['TableType'])) &&
(!empty($_GET['TimeUnit'])) &&
(!empty($_GET['NoAbscissaBins'])) &&
(!empty($_GET['DataTableName'])) &&
(!empty($_GET['MultiplicationFactor'])) &&
(!empty($_GET['TimeStart'])))
{$SensorString = str_replace ( "*", "%", $_GET['SensorString']); // string to fill "WHERE" condition
$TableType = $_GET['TableType']; // boolean/integer/float/string
$TimeUnit = $_GET['TimeUnit']; //hours/days/weeks/months/years
$NoAbscissaBins = $_GET['NoAbscissaBins']; //number of time units to be displayed on the abscissa
$DataTableName = $_GET['DataTableName']; //number of time units to be displayed on the abscissa
$TimeStart = $_GET['TimeStart']; //should not necessarily be used
}
else
{// assume Bewegungsmelder, boolean, hours, 12 bins
$SensorString = "OutsideTemp";
$TableType = "float";
$TimeUnit = "days";
$TimeStart = -12;
$NoAbscissaBins = 30;
$DataTableName = "dataMasterTable";
}
$RedirectEchoToFile = false;
$DataCollectionArray = DataCollectionCrossTab($SensorString, $TableType, $TimeUnit, $NoAbscissaBins, $TimeStart, $DataTableName);
//echo "GoogleDataRow: ". $DataCollectionArray['GoogleDataRow'] ;
$GoogleArray = PrepareGoogleChart($DataCollectionArray);
/* $GoogleArray has the following keys:
/ [0] => GoogleAddColumns
/ [1] => GoogleAddRows
/ [2] => GoogleVisualizeColumnCount
/ [3] => GoogleVisualizeColumnsAvg
/ [4] => GoogleVisualizeColumnsMinStdevStdevMax
/ [5] => MainCrosstabSelectQuery
*/
echo json_encode($GoogleArray);
//---------------------------------------------------
Function PrepareGoogleChart($DataCollectionArray)
{
// var GoogleAddColumns adds columns to DataTable
$TimeUnit = "hours"; // (can be "hours", "days", "months", "years" )
$GoogleAddColumns = "";
// var GoogleVisualizeColumnsAll renders DataView1 view of DataTable
// var VisualizeFirstColumn sets the first column, and renders "hours" (can be changed to days etc.)
$VisualizeFirstColumn = ".setColumns([
{calc: function(data, row)
{return data.getFormattedValue(row, "
. ColumnLabel($TimeUnit). "); },
type:'string'}";
//set up dataView1, which is essentially useless
$GoogleVisualizeColumnsAll =
"var dataView1 = new google.visualization.DataView(".$DataCollectionArray['DataTableName'].");".chr(13)
."dataView1".$VisualizeFirstColumn;
//set up dataViewCount, which is good to count events from IpsLoggingBoolean and feed a column chart
$GoogleVisualizeColumnCount =
"var dataViewCount = new google.visualization.DataView(".$DataCollectionArray['DataTableName'].");"
.chr(13)."dataViewCount".$VisualizeFirstColumn;
//set up dataViewAvg, which visualizes only the averages and is good for line charts
$GoogleVisualizeAvg =
"var dataViewAvg =
new google.visualization.DataView(".$DataCollectionArray['DataTableName'].");".chr(13).
"dataViewAvg"
.".setColumns([ {calc: function(data, row)
{return data.getFormattedValue(row, "
. ColumnLabel($TimeUnit). "); },
type:'string'}";
//set up dataViewMinStdevStdevMax, which can feed a candlestick chart
$GoogleVisualizeColumnsMinStdevStdevMax =
"var dataViewMinStdevStdevMax =
new google.visualization.DataView(".$DataCollectionArray['DataTableName'].");".chr(13)
."dataViewMinStdevStdevMax"
.".setColumns([ {calc: function(data, row)
{return data.getFormattedValue(row, "
. ColumnLabel($TimeUnit). "); },
type:'string'}";
$GoogleVisualizeScattergram =
"var dataViewScattergram = new google.visualization.DataView(".$DataCollectionArray['DataTableName'].");"
.chr(13)."dataViewScattergram.setColumns([";
//create strings for Google DataTable/DataView1 columns definition
$GoogleAddColumns =
"var ". $DataCollectionArray['DataTableName']. "= new google.visualization.DataTable();".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('string', 'hoursIndex');".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('string', 'hours');".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('string', 'PlaceHolder1');".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('string', 'PlaceHolder2');".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('string', 'PlaceHolder3'); ";
for ($varIndex=0; $varIndex < ($DataCollectionArray['NumberOfColumns']-5); $varIndex++)
{
Switch ($DataCollectionArray['TableType'])
{
case "boolean":
$GoogleAddColumns .=
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. ", 'count$varIndex'); ";
break;
case "integer":
$GoogleAddColumns .=
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'avg'); ".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'stddev+'); ".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'stddev-'); ". chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'max'); " .chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'min'); " .chr(13);
break;
case "float":
$GoogleAddColumns .=
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'avg'); ".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'stddev+'); ".chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'stddev-'); ". chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'max'); " .chr(13).
$DataCollectionArray['DataTableName'].".addColumn('number', ".$DataCollectionArray['CategoryArray'][$varIndex]. " +'min'); " .chr(13);
break;
case "string":
//no visualization in case of strings, but a "tableChart" could be generated if need be.
break;
}
$GoogleVisualizeColumnsAll .=
", ". strval(($varIndex+1)*4+1).", ".
strval(($varIndex+1)*4+2).", ".
strval(($varIndex+1)*4+3).", ".
strval(($varIndex+1)*4+4);
$GoogleVisualizeColumnCount .=
", ". strval(($varIndex+1)+4);
$GoogleVisualizeAvg .=
", ". strval(($varIndex+1)*5+0);
$GoogleVisualizeColumnsMinStdevStdevMax .=
", ". strval(($varIndex+1)*5+1).
", ". strval(($varIndex+1)*5+2).
", ". strval(($varIndex+1)*5+3).
", ". strval(($varIndex+1)*5+4);
$GoogleVisualizeScattergram .= strval(($varIndex+1)*4+2).", ";
}
//echo "Tabletype: ". $DataCollectionArray['TableType'].chr(13)."<br>"."<br>";
//echo "GoogleAddColumns: ". $GoogleAddColumns.chr(13)."<br>"."<br>";
$GoogleVisualizeColumnsAll .= "]);".chr(13);
$GoogleVisualizeColumnCount .= "]);".chr(13);
$GoogleVisualizeAvg .= "]);".chr(13);
$GoogleVisualizeColumnsMinStdevStdevMax.= "]);".chr(13);
$GoogleVisualizeScattergram = substr($GoogleVisualizeScattergram, 0, -2) . "]);".chr(13);
VerboseEcho($GoogleAddColumns. "<br><br><br>".$GoogleVisualizeColumnsAll);
//create dataset rows to be processed into google datatable
$DataForGoogleChart = $DataCollectionArray['GoogleDataRow'];
//echo "<br><font color='green'>DataForGoogleChart: $DataForGoogleChart</font><br>";
$GoogleFormattedDataArray = array(
'GoogleAddColumns' => $GoogleAddColumns,
'GoogleAddRows' => $DataCollectionArray['DataTableName'].'.addRows('.$DataCollectionArray['GoogleDataRow'].'); '.chr(13),
'GoogleVisualizeColumnCount' => $GoogleVisualizeColumnCount,
'GoogleVisualizeColumnsAvg' => $GoogleVisualizeAvg,
'GoogleVisualizeColumnsMinStdevStdevMax' => $GoogleVisualizeColumnsMinStdevStdevMax,
'MainCrosstabSelectQuery' => $DataCollectionArray['MainCrosstabSelectQuery']
);
return $GoogleFormattedDataArray;
}
//-----------------------------------------------------
Function DataCollectionCrossTab($SensorString, $TableType, $TimeUnit, $NoAbscissaBins, $TimeStart, $DataTableName) //sensorstring: e.g. DigitalInput 2
{
$dbconn = pg_connect("host=10.10.10.8 port=5432 dbname=IpsLogging user=*** password=***")
or die ('connection aborted: ' . pg_last_error().chr(13));
switch ($TableType)
{
case "boolean":
$IpsTable = "loggingdb_ips_boolean";
$AggregateFunctions = "COUNT(*) As value ";
$SensorColumn = 2;
$WhereClause=" AND (log.ipsvalue = true) "; //only movement triggers
break;
case "integer":
$IpsTable = "loggingdb_ips_integer";
$AggregateFunctions = "(AVG(ipsvalue)::NUMERIC(8,2))
||'', '' ||
(MIN(ipsvalue)::NUMERIC(8,2))
||'', '' ||
((AVG(ipsvalue)::NUMERIC(8,2)) - (coalesce(STDDEV(ipsvalue), 0)::NUMERIC(8,2)))
||'', '' ||
((AVG(ipsvalue)::NUMERIC(8,2)) + (coalesce(STDDEV(ipsvalue), 0)::NUMERIC(8,2)))
||'', '' ||
(MAX(ipsvalue)::NUMERIC(8,2))
As value ";
$WhereClause="";
$SensorColumn = 4;
break;
case "float":
$IpsTable = "loggingdb_ips_float";
$AggregateFunctions = "(AVG(ipsvalue)::NUMERIC(8,2))
||'', '' ||
(MIN(ipsvalue)::NUMERIC(8,2))
||'', '' ||
((AVG(ipsvalue)::NUMERIC(8,2)) - (coalesce(STDDEV(ipsvalue), 0)::NUMERIC(8,2)))
||'', '' ||
((AVG(ipsvalue)::NUMERIC(8,2)) + (coalesce(STDDEV(ipsvalue), 0)::NUMERIC(8,2)))
||'', '' ||
(MAX(ipsvalue)::NUMERIC(8,2))
As value ";
$SensorColumn = 4;
$WhereClause="";
break;
case "string":
$IpsTable = "loggingdb_ips_string";
$WhereClause="";
break;
}
Switch ($TimeUnit)
{case "minutes":
$SelectRowNames =
"to_char(ipstimestamp, ''YYYYMMDDHH24MI'') As row_name,
to_char(ipstimestamp, ''FMHH24h:MI'') As labelled_row_name,
''PlaceHolder1'' As PlaceHolder1,
''PlaceHolder2'' As PlaceHolder2,
''PlaceHolder3'' As PlaceHolder3,";
$GroupOrder = "
GROUP BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category
ORDER BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category', ";
break;
case "hours":
$SelectRowNames =
"to_char(ipstimestamp, ''YYYYMMDDHH24'') As row_name,
to_char(ipstimestamp, ''FMDD mon FMHH24h'') As labelled_row_name,
''PlaceHolder1'' As PlaceHolder1,
''PlaceHolder2'' As PlaceHolder2,
''PlaceHolder3'' As PlaceHolder3,";
$GroupOrder = "
GROUP BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category
ORDER BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category', ";
break;
case "days":
$SelectRowNames =
"to_char(ipstimestamp, ''YYYYMMDD'') As row_name,
to_char(ipstimestamp, ''FMDD mon YYYY'') As labelled_row_name,
''PlaceHolder1'' As PlaceHolder1,
''PlaceHolder2'' As PlaceHolder2,
''PlaceHolder3'' As PlaceHolder3,";
$GroupOrder = "
GROUP BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category
ORDER BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category', ";
break;
case "weeks":
$SelectRowNames =
"to_char(ipstimestamp, ''YYYYWW'') As row_name,
''wk'' || to_char(ipstimestamp, ''FMWW YYYY'') As labelled_row_name,
''PlaceHolder1'' As PlaceHolder1,
''PlaceHolder2'' As PlaceHolder2,
''PlaceHolder3'' As PlaceHolder3,";
$GroupOrder = "
GROUP BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category
ORDER BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category', ";
break;
case "months":
$SelectRowNames =
"to_char(ipstimestamp, ''YYYYMM'') As row_name,
to_char(ipstimestamp, ''mon YYYY'') As labelled_row_name,
''PlaceHolder1'' As PlaceHolder1,
''PlaceHolder2'' As PlaceHolder2,
''PlaceHolder3'' As PlaceHolder3,";
$GroupOrder = "
GROUP BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category
ORDER BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category', ";
break;
case "years":
$SelectRowNames =
"to_char(ipstimestamp, ''YYYY'') As row_name,
to_char(ipstimestamp, ''YYYY'') As labelled_row_name,
''PlaceHolder1'' As PlaceHolder1,
''PlaceHolder2'' As PlaceHolder2,
''PlaceHolder3'' As PlaceHolder3,";
$GroupOrder = "
GROUP BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category
ORDER BY row_name, labelled_row_name, PlaceHolder1, PlaceHolder2, PlaceHolder3, objectid, category', ";
break;
}
// echo "type ".$IpsTable." <br>";
$SensorResult = GetSensorNames($SensorString, $TableType, "", "",0, 1);
// echo "SensorResult: ".$SensorResult.chr(13);
$CategoryString = implode(", ", pg_fetch_all_columns($SensorResult,$SensorColumn));
$CategoryArray = pg_fetch_all_columns(GetSensorNames($SensorString, $TableType, "", "",0, 0),5); //array containing the name of each sensor
// echo "<strong>CategoryString: </strong>". $CategoryString.chr(13)."<br><br><br><br>";
//Print_r ($CategoryArray);
//primary query (non-crosstabbed yet)
$PrimaryQuery ="'SELECT ". $SelectRowNames.
"varid As category, "
.$AggregateFunctions
." FROM $IpsTable As log
JOIN ipsobjects_with_parent ips
ON log.varid = ips.objectid
WHERE (ips.objectname LIKE ''".$SensorString."'') "
. $WhereClause . "
AND (ipstimestamp > (now()- ''". $NoAbscissaBins . " " . $TimeUnit. "''::interval)) ". $GroupOrder ;
// echo "<strong>PrimaryQuery: $PrimaryQuery</strong>";
//main crosstab query which pulls all the content data:
$MainCrosstabSelectQuery =
"SELECT * FROM crosstab
(" .$PrimaryQuery .
"'SELECT DISTINCT varid
FROM $IpsTable As log
JOIN ipsobjects_with_parent ips
ON log.varid = ips.objectid
WHERE (ips.objectname LIKE ''".$SensorString."'')
ORDER BY 1;'
)
As CountsPerHour(row_name text,
label_row_name text,
PlaceHolder1 text,
PlaceHolder2 text,
PlaceHolder3 text, "
.$CategoryString.")";
//echo "<br><font color='red'>$MainCrosstabSelectQuery</font><br>";
$QueryResult=pg_query ($dbconn, $MainCrosstabSelectQuery);
$CrosstabArray = pg_fetch_all($QueryResult);
//echo "CrosstabArray: " . $CrosstabArray ;
//$table = good_query_table($CrosstabArray, $QueryResult, 0);
//BetterTable($QueryResult); //this functions outputs a nicely formatted crosstab!
if (!$QueryResult)
echo "PG Error: ". pg_last_error().chr(13);
// create bracketed Array of Arrays GoogleDataRow
$GoogleDataRow ="["; //opening bracket inserted
while ($field = pg_fetch_row($QueryResult))
{
$GoogleDataRow .="[";
$index =0;
switch ($TableType)
{
case "boolean":
foreach ($field as $col_value) {
$index++;
if ($index<6)
//the first five columns are strings (date headers)
{$GoogleDataRow .= "'".$col_value."', ";}
else{
//anythign above 5 is data
//substitute NULL with zeroes, else GoogleChart doesnt work
if($col_value == NULL) $col_value = "null";
$GoogleDataRow .= $col_value.", ";
}
}
break;
case "integer":
foreach ($field as $col_value) {
++$index;
if ($index<6)
{//the first give columns are strings (date headers)
$GoogleDataRow .= "'".$col_value."', ";}
else{
//anythign above 5 is data
//substitute NULL with 5x zeroes, else GoogleChart doesnt work
if($col_value == NULL) $col_value = "null,null,null,null,null";
$GoogleDataRow .= $col_value.", ";
}
}
break;
case "float":
foreach ($field as $col_value) {
++$index;
if ($index<6)
{//the first give columns are strings (date headers)
$GoogleDataRow .= "'".$col_value."', ";}
else{
//anythign above 5 is data
//substitute NULL with 5x zeroes, else GoogleChart doesnt work
if($col_value == NULL) $col_value = "null,null,null,null,null";
$GoogleDataRow .= $col_value.", ";
}
}
break;
case "string":
foreach ($field as $col_value) {
++$index;
if ($index<5)
//the first give columns are strings (date headers)
{$GoogleDataRow .= "'".$col_value."', ";}
else{
//anythign above 5 is data
//substitute NULL with zeroes, else GoogleChart doesnt work
if($col_value == NULL) $col_value = 0;
$GoogleDataRow .= $col_value." ";
}
}
break;
}
$GoogleDataRow = substr($GoogleDataRow,0,-5)."], ";
//echo "<br><font color='blue'>$GoogleDataRow </font><br>";
}
$GoogleDataRow = substr($GoogleDataRow,0,-2)."]";
$DataCollectionArray = array(
"GoogleDataRow"=>$GoogleDataRow,
"NumberOfColumns"=>pg_num_fields($QueryResult), // total number of columns, including all row headers
"CategoryArray"=>$CategoryArray,
"TableType"=>$TableType,
"DataTableName" => $DataTableName,
"MainCrosstabSelectQuery" => $MainCrosstabSelectQuery
);
return $DataCollectionArray;
}
//---------------------------------------
function BetterTable($result)
{
$i = 0;
echo "<html>
<body>
<table>
<table class='BetterTable' border='1'>";
echo "<tr>";
echo '<td>Line #
</td>';
while ($i < pg_num_fields($result))
{
$fieldName = pg_field_name($result, $i);
echo '<td>' . $fieldName . '</td>';
$i = $i + 1;
}
echo '</tr>';
$i = 0;
while ($field = pg_fetch_row($result))
{
if ($i%2 == 0)
Echo "<tr bgcolor=\"#d0d0d0\" >";
else
Echo "<tr bgcolor=\"#eeeeee\">";
$fields = count($field);
$y = 0;
echo '<td>'.$i. '</td>';
while ($y < $fields)
{
$c_row = current($field);
echo '<td>'.$c_row . '</td>';
next($field);
$y = $y + 1;
}
echo '</tr>';
$i = $i + 1;
}
echo '</table><br><br></body></html>';
}
//----------------------------------------------------
Function GetSensorNames($SensorType, $TableType, $prefix, $postfix, $QueryType, $column)
{//TableType specifies the type of variable, and redirectes to the correct table.
//prefix and postfix are adapters returned for each row
//
//retrieve full names of DataCollection variables, including parent names
//QueryColumns specifies which query columns (see below)
$dbconn = pg_connect("host=10.10.10.8 port=5432 dbname=IpsLogging user=*** password=***")
or die ('connection aborted: ' . pg_last_error().chr(13));
switch ($TableType)
{
case "boolean":
$IpsTable = "loggingdb_ips_boolean";
break;
case "integer":
$IpsTable = "loggingdb_ips_integer";
break;
case "float":
$IpsTable = "loggingdb_ips_float";
break;
case "string":
$IpsTable = "loggingdb_ips_string";
break;
}
// echo "type ".$IpsTable." <br>";
if ($prefix!="") $prefix = $prefix." || ";
if ($postfix!="")$postfix = " || ". $postfix;
$GetSensorNamesString =
"SELECT
DISTINCT '\"' || varid ||'\"' || ' integer ' as integername,
varid as NakedVariable,
'\"' || ips.parentname || ' - ' || ips.objectname || ' (' || ips.objectid || ')\"' || ' integer ' AS fullname,
'\"' || ips.parentname || ' - ' || ips.objectname || ' (' || ips.objectid || ')\"' || ' numeric(8,2) ' AS fullnamenumeric,
'\"' || ips.parentname || ' - ' || ips.objectname || ' (' || ips.objectid || ')\"' || ' text ' AS fullnamestring,
'\"' || ips.parentname || ' - ' || ips.objectname || ' (' || ips.objectid || ')\"' AS fullnamestring,
ips.parentname || ' - ' || ips.objectname || ' (' || ips.objectid || ')' || ' text ' AS fullnamestringwithoutquotes,
$prefix varid $postfix as DecoratedVariable
FROM $IpsTable As log
JOIN ipsobjects_with_parent ips
ON log.varid = ips.objectid
WHERE (ips.objectname LIKE '$SensorType')
ORDER BY 1;
";
//echo "<strong>$GetSensorNamesString</strong>";
$QueryResult=pg_query ($dbconn, $GetSensorNamesString);
if (!$QueryResult)
echo "PG Error: ". pg_last_error().chr(13);
else
{return $QueryResult;}
}
//-----------------------------
Function ColumnLabel($TimeUnit)
{
switch ($TimeUnit)
{
case "minutes": $ColumnLabel= "0"; break;
case "hours": $ColumnLabel= "1"; break;
case "days": $ColumnLabel= "2"; break;
case "months": $ColumnLabel= "3"; break;
case "years": $ColumnLabel= "4"; break;}
return($ColumnLabel);
}
//--------------------------------------------
function VerboseEcho($Anything)
{global $Verbose;
if ($Verbose == true) Echo $Anything;}
?>
答案 0 :(得分：1)
有一些工具可以在虚拟浏览器中呈现网页，然后可以截取屏幕截图或只是将网页导出为图像文件。这里最好的格式是PNG，只是为了不降低图表中细节的可读性。
我在这里看到类似的文章：How to screenshot website in JavaScript client-side / how Google did it? (no need to access HDD)