ViewFoundSet

Constants Summary

Property Summary

Methods Summary

Constants Details

MONITOR_AGGREGATES

Constant for the flags in #enableDatabroadcastFor(QBTableClause,int) to listen for changes in columns (selected) of the given datasource in the query that can affect aggregates. This means that when there are deletes, inserts or updates on columns selected from that datasource, a full re-query will happen to refresh the aggregates.

IMPORTANT: in general, this flag should be set on (possible multiple) datasources from the query that have group by on their columns, and the columns don't contain the pk, or that have the actual aggregates on their columns (because all those could influence the value of aggregates).

For example (ignoring the fact that in a real-life situation these fields might not change), a view foundset based on this query:

SELECT orders.customerid, orders.orderdate, SUM(order_details.unitprice) FROM orders LEFT OUTER JOIN order_details ON orders.orderid = order_details.orderid GROUP BY orders.customerid, orders.orderdate ORDER BY orders.customerid asc, orders.orderdate desc

will want to enable databroadcast flag MONITOR_AGGREGATES on both "orders" (because if "orderdate" or "customerid" - that are used in GROUP BY - change/are corrected on a row, that row could move from one group to the other, affecting the SUM(order_details.unitprice) for the groups involved) and "order_details" (because if "unitprice" changes/is corrected, the aggregate will be affected).

But if the above query would also select the orders.odersid (and also group by that) then the orders row that you select for that sum will always be unique and only #MONITOR_COLUMNS has to be used for those - if needed.

Returns Number

Sample

MONITOR_COLUMNS

Constant for the flags in #enableDatabroadcastFor(QBTableClause,int) to listen also for column changes of the given table/datasource. This is used by default if you just use enableDatabroadcastFor() without flags. If you use the one with the flags you need to give this one if you just want to listen to column changes that are in the result for a given datasource and pk.

This constants needs to have the pk's selected for the given datasource (should be in the results).

Returns Number

Sample

MONITOR_DELETES

Constant for the flags in #enableDatabroadcastFor(QBTableClause,int) to listen for deletes on the given table/datasource. This will always result in a full query to detect changes whenever an delete on that table happens.

Returns Number

Sample

MONITOR_DELETES_FOR_PRIMARY_TABLE

Constant for the flags in #enableDatabroadcastFor(QBTableClause,int) to listen for deletes on the given table/datasource which should be the primary/main table of this query. If a delete comes in for this table, then we will only remove the records from the ViewFoundSet that do have this primary key in its value. So no need to do a full query. So this will only work if the query shows order_lines for the order_lines table, not for the products table that is joined to get the product_name. Only 1 of the 2 monitors for deletes should be registered for a table/datasource.

This constants needs to have the pk's selected for the given datasource (should be in the results)

Returns Number

Sample

MONITOR_INSERT

Constant for the flags in #enableDatabroadcastFor(QBTableClause,int) to listen for inserts on the given table/datasource. This will always result in a full query to detect changes whenever an insert on that table happens.

Returns Number

Sample

MONITOR_JOIN_CONDITIONS

Constant for the flags in #enableDatabroadcastFor(QBTableClause,int) to listen also for column changes of the given table/datasource in the join statement - like order_lines.productid that has a join to orders and is displaying the productname. If a change in such a join condition (like order_lines.productid in the sample above) is seen then the query will be fired again to detect changes.

Returns Number

Sample

MONITOR_WHERE_CONDITIONS

Constant for the flags in #enableDatabroadcastFor(QBTableClause,int) to listen also for column changes of the given table/datasource that are used in the where statement - like order_lines.unit_price > 100. If a change is seen on that datasource on such a column used in the where a full query will be fired again to detect changes.

Returns Number

Sample

VIEW_FOUNDSET

Returns String

Sample

Properties Details

multiSelect

Returns true if this foundset is in multiselect mode and false if it's in single-select mode.

Returns Boolean true if this foundset is in multiselect mode and false if it's in single-select mode.

Sample

Methods Details

dispose()

Dispose and unregisters a view foundset from memory when is no longer needed. Returns whether foundset was disposed. If linked to visible form or component, view foundset cannot be disposed.

Normally ViewFoundSets are not hold on to by the system, so if you only use this inside a method it will be disposed by itself. This method is then just helps by also calling clear()

For ViewFoundSets that are also registered by using true as the last argument in the call: databaseMananager.getViewFoundSet(name, query, boolean register) are hold on to by the system and Forms can use it for there foundset. Calling dispose on those will remove it from the system, so it is not usable anymore in forms.

Returns Boolean boolean foundset was disposed

Sample

vfs.dispose();

duplicateFoundSet()

Get a duplicate of the viewfoundset. This is a full copy of the view foundset.

Returns JSFoundSet foundset duplicate.

Sample

var dupFoundset = foundset.duplicateFoundSet();

enableDatabroadcastFor(queryTable)

Databroadcast can be enabled per select table of a query, the select table can be the main QBSelect or on of it QBJoins By default this monitors only the column values that are in the result of the QBSelect, you can only enable this default monitoring for a table if for that table also the PK is selected in the results.

you can use #enableDatabroadcastFor(QBTableClause,int) to specify what should be monitored more besides pure column values per pk. Those have impact on performance because for the most part if we see a hit then a full query is done to see if there are changes.

Parameters QBTableClause queryTable The QBSelect or QBJoin of a full query where this foundset should listen for data changes.

Returns void

Sample

var select = datasources.db.example_data.order_details.createSelect();
 var join = select.joins.add("db:/example_data/products");
 join.on.add(select.columns.productid.eq(join.columns.productid));
 select.result.add(); // add columns of the select or join
 var vf = databaseManager.getViewFoundSet("myorders",select)
 vf.enableDatabroadcastFor(select);
 vf.enableDatabroadcastFor(join);

enableDatabroadcastFor(queryTableclause, flags)

Enable the databroadcast for a specific table of the QBSelect or QBJoin with flags for looking for join or where criteria or deletes/inserts. These flags can be a performance hit because the query needs to be executed again to see if there are any changes. For certain flags #MONITOR_COLUMNS and #MONITOR_DELETES_FOR_PRIMARY_TABLE the pk for that table must be in the results.

Parameters QBTableClause queryTableclause The QBSelect or QBJoin of a full query where this foundset should listen for data changes. Number flags One or more of the ViewFoundSet.XXX flags added to each other.

Returns void

Sample

var select = datasources.db.example_data.order_details.createSelect();
 var join = select.joins.add("db:/example_data/products");
 join.on.add(select.columns.productid.eq(join.columns.productid));
 select.result.add(); // add columns of the select or join
 var vf = databaseManager.getViewFoundSet("myorders",select)
 // monitor for the main table the join conditions (orders->product, when product id changes in the orders table) and requery the table on insert events, delete directly the record if a pk delete happens.
 vf.enableDatabroadcastFor(select, ViewFoundSet.MONITOR_JOIN_CONDITIONS | ViewFoundSet.MONITOR_INSERT | ViewFoundSet.MONITOR_DELETES_FOR_PRIMARY_TABLE);
 vf.enableDatabroadcastFor(join);

forEach(callback)

Iterates over the records of a foundset taking into account inserts and deletes that may happen at the same time. It will dynamically load all records in the foundset (using Servoy lazy loading mechanism). If callback function returns a non null value the traversal will be stopped and that value is returned. If no value is returned all records of the foundset will be traversed. Foundset modifications( like sort, omit...) cannot be performed in the callback function. If foundset is modified an exception will be thrown. This exception will also happen if a refresh happens because of a rollback call for records on this datasource when iterating. When an exception is thrown from the callback function, the iteration over the foundset will be stopped.

Parameters Function callback The callback function to be called for each loaded record in the foundset. Can receive three parameters: the record to be processed, the index of the record in the foundset, and the foundset that is traversed.

Returns Object Object the return value of the callback

Sample

foundset.forEach(function(record,recordIndex,foundset) {
 	//handle the record here
 });

forEach(callback, thisObject)

Iterates over the records of a foundset taking into account inserts and deletes that may happen at the same time. It will dynamically load all records in the foundset (using Servoy lazy loading mechanism). If callback function returns a non null value the traversal will be stopped and that value is returned. If no value is returned all records of the foundset will be traversed. Foundset modifications( like sort, omit...) cannot be performed in the callback function. If foundset is modified an exception will be thrown. This exception will also happen if a refresh happens because of a rollback call for records on this datasource when iterating. When an exception is thrown from the callback function, the iteration over the foundset will be stopped.

Parameters Function callback The callback function to be called for each loaded record in the foundset. Can receive three parameters: the record to be processed, the index of the record in the foundset, and the foundset that is traversed. Object thisObject What the this object should be in the callback function (default it is the foundset)

Returns Object Object the return value of the callback

Sample

foundset.forEach(function(record,recordIndex,foundset) {
 	//handle the record here
 });

getCurrentSort()

Get the last sort columns that were set using viewfoundset sort api.s

Returns String String sort columns

Sample

//reverse the current sort

//the original sort "companyName asc, companyContact desc"
//the inversed sort "companyName desc, companyContact asc"
var foundsetSort = foundset.getCurrentSort()
var sortColumns = foundsetSort.split(',')
var newFoundsetSort = ''
for(var i=0; i<sortColumns.length; i++)
{
	var currentSort = sortColumns[i]
	var sortType = currentSort.substring(currentSort.length-3)
	if(sortType.equalsIgnoreCase('asc'))
	{
		newFoundsetSort += currentSort.replace(' asc', ' desc')
	}
	else
	{
		newFoundsetSort += currentSort.replace(' desc', ' asc')
	}
	if(i != sortColumns.length - 1)
	{
		newFoundsetSort += ','
	}
}
foundset.sort(newFoundsetSort)

getDataSource()

Returns the datasource (view:name) for this ViewFoundSet.

Returns String

Sample

solutionModel.getForm("x").dataSource  = viewFoundSet.getDataSource();

getEditedRecords()

Get the edited records of this view foundset.

Returns Array an array of edited records

Sample

var editedRecords = foundset.getEditedRecords();
for (var i = 0; i < editedRecords.length; i++)
{
   application.output(editedRecords[i]);
}

getFailedRecords()

Get the records which could not be saved.

Returns Array an array of failed records

Sample

getName()

Get foundset name. If foundset is not named foundset will return null.

Returns String name.

Sample

var name = foundset.getName()

getQuery()

Get the cloned query that created this ViewFoundSset (modifying this QBSelect will not change the foundset). The ViewFoundSets main query can't be altered after creation; you need to make a new ViewFoundSet for that (it can have the same datasource name).

Returns QBSelect query.

Sample

var q = foundset.getQuery()
q.where.add(q.columns.x.eq(100))
var newVF = databaseManager.getViewFoundset("name", q);

getRecord(index)

Get the ViewRecord object at the given index. Argument "index" is 1 based (so first record is 1).

Parameters Number index record index (1 based).

Returns JSRecord ViewRecord record.

Sample

var record = vfs.getRecord(index);

getRecordByPk(pk)

Get the ViewRecord from the primary key values.

Parameters Array pk pk values as array

Returns JSRecord ViewRecord record.

Sample

var record = vfs.getRecordByPk(1);  // or getRecordByPk(1,2) or ([1,2]) for multicolumn pk

getRecordIndex(record)

Get the record index. Will return -1 if the record can't be found.

Parameters JSRecord record Record

Returns Number int index.

Sample

var index = foundset.getRecordIndex(record);

getSQL()

Returns the internal SQL of the JSFoundset. Optionally, the foundset and table filter params can be excluded in the sql (includeFilters=false).

Returns String String representing the sql of the JSFoundset.

Sample

var sql = foundset.getSQL(true)

getSQL(includeFilters)

Returns the internal SQL of the JSFoundset. Optionally, the foundset and table filter params can be excluded in the sql (includeFilters=false).

Parameters Boolean includeFilters include the foundset and table filters [default true].

Returns String String representing the sql of the JSFoundset.

Sample

var sql = foundset.getSQL(true)

getSQLParameters()

Returns the parameters for the internal SQL of the QBSelect. Table filters are on by default.

Returns Array An Array with the sql parameter values.

Sample

var parameters = foundset.getSQLParameters(true)

getSQLParameters(includeFilters)

Returns the parameters for the internal SQL of the QBSelect. Table filters are on by default.

Parameters Boolean includeFilters include the foundset and table filters [default true].

Returns Array An Array with the sql parameter values.

Sample

var parameters = foundset.getSQLParameters(true)

getSelectedIndex()

Get the current record index of the foundset.

Returns Number int current index (1-based)

Sample

//gets the current record index in the current foundset
var current = foundset.getSelectedIndex();
//sets the next record in the foundset
foundset.setSelectedIndex(current+1);

getSelectedIndexes()

Get the indexes of the selected records. When the founset is in multiSelect mode (see property multiSelect), a selection can consist of more than one index.

Returns Array Array current indexes (1-based)

Sample

// modify selection to the first selected item and the following row only
var current = foundset.getSelectedIndexes();
if (current.length > 1)
{
	var newSelection = new Array();
	newSelection[0] = current[0]; // first current selection
	newSelection[1] = current[0] + 1; // and the next row
	foundset.setSelectedIndexes(newSelection);
}

getSelectedRecord()

Returns JSRecord

Sample

getSelectedRecords()

Get the selected records. When the viewfoundset is in multiSelect mode (see property multiSelect), selection can be a more than 1 record.

Returns Array Array current records.

Sample

var selectedRecords = foundset.getSelectedRecords();

getSize()

Get the number of records in this viewfoundset. This is the number of records loaded, note that when looping over a foundset, size() may increase as more records are loaded.

Returns Number int current size.

Sample

var nrRecords = vfs.getSize()

// to loop over foundset, recalculate size for each record
for (var i = 1; i <= foundset.getSize(); i++)
{
	var rec = vfs.getRecord(i);
}

hasRecordChanges()

Check whether the foundset has record changes.

Returns Boolean true if the foundset has any edited records, false otherwise

Sample

hasRecords()

Returns true if the viewfoundset has records.

Returns Boolean true if the viewfoundset has records.

Sample

loadAllRecords()

This will reload the current set of ViewRecords in this foundset, resetting the chunk size back to the start (default 200). All edited records will be discarded! So this can be seen as a full clean up of this ViewFoundSet.

Returns void

Sample

revertEditedRecords()

Revert changes of all unsaved view records of the view foundset.

Returns void

Sample

revertEditedRecords(rec)

Revert changes of the provided view records.

Parameters Array rec an array of view records

Returns void

Sample

save()

Saves all records in the view foundset that have changes. You can only save columns from a table if the pks of that table are also selected by the view foundset's query.

Returns Boolean true if the save was successfull, false if not and then the record will hav the exception set.

Sample

save(record)

Saved a specific record of this foundset. You can only save columns from a table if also the pk is selected of that table

Parameters JSRecord record ;

Returns Boolean true if the save was successfull, false if not and then the record will hav the exception set.

Sample

setSelectedIndex(index)

Set the current record index.

Parameters Number index index to set (1-based)

Returns void

Sample

//gets the current record index in the current foundset
var current = foundset.getSelectedIndex();
//sets the next record in the foundset
foundset.setSelectedIndex(current+1);

setSelectedIndexes(indexes)

Set the selected records indexes.

Parameters Array indexes An array with indexes to set.

Returns void

Sample

// modify selection to the first selected item and the following row only
var current = foundset.getSelectedIndexes();
if (current.length > 1)
{
	var newSelection = new Array();
	newSelection[0] = current[0]; // first current selection
	newSelection[1] = current[0] + 1; // and the next row
	foundset.setSelectedIndexes(newSelection);
}

sort(sortString)

Sorts the foundset based on the given sort string. Column in sort string must already exist in ViewFoundset.

Parameters String sortString the specified columns (and sort order)

Returns void

Sample

foundset.sort('columnA desc,columnB asc');

sort(sortString, defer)

Sorts the foundset based on the given sort string. Column in sort string must already exist in ViewFoundset.

Parameters String sortString the specified columns (and sort order) Boolean defer when true, the "sortString" will be just stored, without performing a query on the database (the actual sorting will be deferred until the next data loading action).

Returns void

Sample

foundset.sort('columnA desc,columnB asc');

sort(recordComparisonFunction)

Sorts the foundset based on the given record comparator function. Tries to preserve selection based on primary key. If first record is selected or cannot select old record it will select first record after sort. The comparator function is called to compare two records, that are passed as arguments, and it will return -1/0/1 if the first record is less/equal/greater then the second record.

The function based sorting does not work with printing. It is just a temporary in-memory sort.

NOTE: starting with 7.2 release this function doesn't save the data anymore

Parameters Function recordComparisonFunction record comparator function

Returns void

Sample

foundset.sort(mySortFunction);

function mySortFunction(r1, r2)
{
	var o = 0;
	if(r1.id < r2.id)
	{
		o = -1;
	}
	else if(r1.id > r2.id)
	{
		o = 1;
	}
	return o;
}

validate(record)

Validates the given record, it runs first the method that is attached to the entity event "onValidate". Those methods do get a parameter JSRecordMarkers where the problems can be reported against. All columns are then also null/empty checked and if they are and the Column is marked as "not null" an error will be added with the message key "servoy.record.error.null.not.allowed" for that column.

An extra state object can be given that will also be passed around if you want to have more state in the validation objects (like giving some ui state so the entity methods know where you come from)

It will return a JSRecordMarkers when the record had validation problems

Parameters JSRecord record ;

Returns JSRecordMarkers Returns a JSRecordMarkers if the record has validation problems

Sample

validate(record, customObject)

Validates the given record, it runs first the method that is attached to the entity event "onValidate". Those methods do get a parameter JSRecordMarkers where the problems can be reported against. All columns are then also null/empty checked and if they are and the Column is marked as "not null" an error will be added with the message key "servoy.record.error.null.not.allowed" for that column.

An extra state object can be given that will also be passed around if you want to have more state in the validation objects (like giving some ui state so the entity methods know where you come from)

It will return a JSRecordMarkers when the record had validation problems

Parameters JSRecord record The ViewRecord to validate Object customObject An extra customObject to give to the validate method.

Returns JSRecordMarkers

Sample

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