ActionScript® 3.0 Reference for the Adobe® Flash® Platform
Home  |  Show Packages and Classes List |  Packages  |  Classes  |  What's New  |  Index  |  Appendixes
flash.data 

SQLResult  - AS3

Packageflash.data
Classpublic class SQLResult
InheritanceSQLResult Inheritance Object

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

The SQLResult class provides access to data returned in response to the execution of a SQL statement (a SQLStatement instance).

The SQLResult instance for a SQL statement is accessed by calling the SQLStatement.getResult() method or as an argument passed to the result handler of a Responder instance specified in a call to SQLStatement.execute() or SQLStatement.next(). Generally, developer code does not construct SQLResult instances directly.

You use a SQLResult object to access the rows of data returned from a SELECT statement (using the data property), to get row identifier information for an INSERT statement (using the lastInsertRowID property), to determine the number of rows affected by an INSERT, UPDATE, or DELETE statement (using the rowsAffected property), or to determine whether there are additional SELECT result rows that haven't been retrieved (using the complete property).

More examples

Related API Elements



Public Properties
 PropertyDefined By
      complete : Boolean
[read-only] Indicates whether all the resulting data from a statement execution has been returned.
SQLResult
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
      data : Array
[read-only] The data returned as a result of the statement execution, specifically when a SQL SELECT statement is executed.
SQLResult
      lastInsertRowID : Number
[read-only] The last generated row identifier generated by a SQL INSERT statement.
SQLResult
      rowsAffected : Number
[read-only] Indicates how many rows were affected by the operation.
SQLResult
Public Methods
 MethodDefined By
  
    SQLResult(data:Array = null, rowsAffected:Number = 0, complete:Boolean = true, rowID:Number = 0)
Creates a SQLResult instance.
SQLResult
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Property Detail
    

complete

property
complete:Boolean  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

Indicates whether all the resulting data from a statement execution has been returned.

When a statement returns one or more rows this property indicates whether all of the rows have been returned. When a SQLStatement object's execute() method is called with a prefetch argument value, only the specified number of rows of the resulting data are returned in the SQLResult object's data property. Subsequent calls to SQLStatement.next() cause additional data to become available. This property is used to determine when the final results have been returned.

Note that because the number of rows is unknown at execution time, the database cursor must move beyond the last row before a statement's execution is considered complete. When the SQLStatement.execute() method is called with a prefetch argument, at least one row more than the total number of rows in the result set must be requested before the resulting SQLResult instance's complete property is true.



Implementation
    public function get complete():Boolean

Related API Elements

    

data

property 
data:Array  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

The data returned as a result of the statement execution, specifically when a SQL SELECT statement is executed.

When a statement returns one or more rows this property is an array containing objects that represent the rows of result data. Each object in the array has property names that correspond to the result data set's column names.

For example, suppose you execute the following SQL SELECT statement:

     SELECT lastName, firstName
     FROM employees
     

Assuming the employees table contains 10 rows, the SQLResult.data property is an Array with 10 elements. Each element is an object with two properties, lastName and firstName.

The situation is more complex when you are using a SELECT statement with a complex result column, such as an aggregate function. For example, suppose you execute the following SQL:

     SELECT departmentId, SUM(salary)
     FROM employees
     GROUP BY departmentId
     

In the results from this statement, each object in the data Array has two properties named departmentId and SUM(salary). However, "SUM(salary)" is not a valid identifier. If you are using a computed column such as an aggregate or other function, specify an alias for the computed column in your SQL statement. The alias is used as the property name in the result data objects. For example, consider this alternative to the previous statement:

     SELECT departmentId, SUM(salary) AS salarySubtotal
     FROM employees
     GROUP BY departmentId
     

In this statement's data array, the result objects have two properties named departmentId and salarySubtotal.

The data property is always an Array regardless of how many rows and columns are in the result set. For example, the following SELECT statement results in one row and one column, which is essentially a single value:

     SELECT COUNT(*) AS numEmployees
     FROM employees
     

After executing the query the data property contains an Array object with one element. That element is an object with a single property, numEmployees.

If there are duplicate column names in the result data, for example if the SELECT statement includes an two different id columns from two different tables, the duplicate names are given property names according to the value of the SQLConnection.columnNameStyle property. By default, each column's name is used as the property name, but if there is are multiple columns in the result set with the same name, the long name format [table-name]_[column-name] is used for the identically named columns. This behavior can be changed by setting the SQLConnection.columnNameStyle property.

By default the objects in the data Array are Object instances. However, by setting the value of the SQLStatement.itemClass property to a class, the data Array elements are created as instances of that class instead. For every column in the result data set, the itemClass class must have a property whose name exactly matches the column name.

If a statement does not return any data this property is null. This is the case if the statement is not a SELECT statement, or if it is a SELECT statement that returns 0 rows.



Implementation
    public function get data():Array

Related API Elements


Example  ( How to use this example )
The following code demonstrates using the itemClass property to have the runtime create instances of a custom class from SQL SELECT statement results.
// Employee class definition
package
{
    public class Employee
    {
        public var name:String;
        public var ssn:String;
        public var id:uint;
        public override function toString():String
        {
            return "id: "+ id.toString() + " name: " + name + " ssn: " + ssn;
        }
    }
}


// using the Employee class as SQLStatement.itemClass
var conn:SQLConnection;
var dbStatement:SQLStatement;

function init():void
{
    conn = new SQLConnection();
    conn.addEventListener(SQLEvent.OPEN, connOpenHandler);
    
    dbStatement = new SQLStatement();
    dbStatement.sqlConnection = conn;
    dbStatement.text = "SELECT id, name, ssn FROM employees";
    dbStatement.itemClass = Employee;
    
    var dbFile:File = new File(File.separator + "employee.db");
    conn.open(dbFile);
}

function connOpenHandler(event:SQLEvent):void
{
    dbStatement.addEventListener(SQLEvent.RESULT, resultHandler);
    dbStatement.execute();
}

function resultHandler(event:SQLEvent):void
{
    var result:SQLResult = dbStatement.getResult();
    if (result != null)
    {
        var emp:Employee;
        var numRows:int = result.data.length;
        for (var i:int = 0; i < numRows; i++)
        {
            emp = result.data[i];
            trace(emp.toString());
        }
    }
}
    

lastInsertRowID

property 
lastInsertRowID:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

The last generated row identifier generated by a SQL INSERT statement.

The value is 0 if the executed statement was not an INSERT statement.

A row identifier is used to uniquely identify a row in a table within the database. The value is frequently generated by the database.

For more information about primary keys and generated row identifiers, see the "CREATE TABLE" and "Expressions" sections in the appendix "SQL support in local databases."



Implementation
    public function get lastInsertRowID():Number

More examples

Related API Elements

    

rowsAffected

property 
rowsAffected:Number  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

Indicates how many rows were affected by the operation. Only changes that are directly specified by an INSERT, UPDATE, or DELETE statement are counted.

Auxiliary changes caused by triggers are not counted. Use the SQLConnection.totalChanges property to find the total number of changes including changes caused by triggers.

Note that when the related SQL operation is a DELETE statement with no WHERE clause (that is, the statement deletes all the rows in the table), the rowsAffected property is always 0, regardless of the number of rows that were deleted. If you need to know the number of rows that are deleted, you can include the WHERE clause WHERE 1 = 1, in which case all the rows are deleted, and the rowsAffected property accurately reflects the number of rows that were deleted. However, depending on the number of rows being deleted, doing so may have a negative impact on the statement's performance.



Implementation
    public function get rowsAffected():Number

Related API Elements

Constructor Detail
    

SQLResult

()Constructor
public function SQLResult(data:Array = null, rowsAffected:Number = 0, complete:Boolean = true, rowID:Number = 0)

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

Creates a SQLResult instance. Generally, developer code does not call the SQLResult constructor directly. To retrieve a SQLResult instance associated with a particular SQLStatement instance, call the instance's getResult() method. A SQLResult instance is also passed as an argument to the result handler function when a Responder instance is specified for an execute() or next() method call.

Parameters
data:Array (default = null) — The array of rows returned from the execution of a statement. If the statement doesn't return any rows this value should be null.
 
rowsAffected:Number (default = 0) — Indicates how many rows the executed statement affected.
 
complete:Boolean (default = true) — Indicates whether there are additional rows that can be fetched or whether all data has been returned.
 
rowID:Number (default = 0) — If the statement was a SQL INSERT operation this is the new unique identifier for the row.