ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
SQL support in local databases
XMLLIST
Object
NONE
TEXT (or String)
A column with TEXT or String affinity stores all data using storage classes NULL, TEXT, or BLOB. If numerical data
is inserted into a column with TEXT affinity it is converted to text form before being stored.
NUMERIC
A column with NUMERIC affinity contains values using storage classes NULL, REAL, or INTEGER. When text data
is inserted into a NUMERIC column, an attempt is made to convert it to an integer or real number before it is stored.
If the conversion is successful, then the value is stored using the INTEGER or REAL storage class (for example, a value
of '10.05' is converted to REAL storage class before being stored). If the conversion cannot be performed an error
occurs. No attempt is made to convert a NULL value. A value that's retrieved from a NUMERIC column is returned
as an instance of the most specific numeric type into which the value fits. In other words, if the value is a positive
integer or 0, it's returned as a uint instance. If it’s a negative integer, it’s returned as an int instance. Finally, if it has a
floating-point component (it's not an integer) it's returned as a Number instance.
INTEGER (or int)
A column that uses INTEGER affinity behaves in the same way as a column with NUMERIC affinity, with one
exception. If the value to be stored is a real value (such as a Number instance) with no floating point component or if
the value is a text value that can be converted to a real value with no floating point component, it is converted to an
integer and stored using the INTEGER storage class. If an attempt is made to store a real value with a floating point
component an error occurs.
REAL (or Number)
A column with REAL or NUMBER affinity behaves like a column with NUMERIC affinity except that it forces integer
values into floating point representation. A value in a REAL column is always returned from the database as a Number
instance.
Boolean
A column with Boolean affinity stores true or false values. A Boolean column accepts a value that is an ActionScript
or JavaScript Boolean instance. If code attempts to store a String value, a String with a length greater than zero is
considered true, and an empty String is false. If code attempts to store numeric data, any non-zero value is stored as
true and 0 is stored as false. When a Boolean value is retrieved using a SELECT statement, it is returned as a Boolean
instance. Non-NULL values are stored using the INTEGER storage class (0 for false and 1 for true) and are converted
to Boolean objects when data is retrieved.
Date
A column with Date affinity stores date and time values. A Date column is designed to accept values that are
ActionScript or JavaScript Date instances. If an attempt is made to store a String value in a Date column, the runtime
attempts to convert it to a Julian date. If the conversion fails an error occurs. If code attempts to store a Number, int, or
uint value, no attempt is made to validate the data and it is assumed to be a valid Julian date value. A Date value that's
retrieved using a SELECT statement is automatically converted to a Date instance. Date values are stored as Julian date
values using the REAL storage class, so sorting and comparing operations work as you would expect them to.
XML or XMLList
Last updated 6/6/2012
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