Tangram::Type - mapping individual fields
Tangram's persistent type system is extensible, allowing you to mount your own types and make them persistent. All you have to do is to register your type and provide mapping code. See Tangram::Type::Extending.
Tangram comes with built-in support for the following types:
Supported are strings, integers, real numbers and dates. More types of this ilk are easily added.
string, int, real: see Tangram::Type::Scalar
string
int
real
date, time, datetime, dmdatetime: see "Date/Type/Date/DateTime" in Tangram::Type
date
time
datetime
dmdatetime
perl_dump: see Tangram::Type::Dump::Perl. A perl_dump structure may contain any structure which Data::Dumper can dump successfully.
perl_dump
storable: see Tangram::Type::Dump::Storable. Very much like perl_dump, but implemented via the `Storable' serialisation engine.
storable
yaml: see Tangram::Type::Dump::YAML. Very much like perl_dump, but implemented via the `YAML' serialisation engine. Doesn't currently work, due to inadequacies in the current Perl YAML implementation.
yaml
NEW in Tangram 2.08:
idbif: see Tangram::Type::Dump::Any. Like the above, but can combine multiple object properties into a single database column.
idbif
Note: these are only actually required if you need to be able to query on individual fields inside the array/hash - otherwise, the perl_dump or idbif mapping is a lot faster and more flexible.
flat_array: see "Array/Scalar" in Tangram::Type
flat_array
flat_hash: see "Hash/Scalar" in Tangram::Type
flat_hash
ref: see Tangram::Type::Ref::FromMany (implementing an N to 1 relationship, in which any object can be the referant)
ref
Set relationships are closest to the main type of relationship used in an RDBMS. Avid CompSci students will know that the relational database model is based heavily on `Set Theory', which is a subset of a more general concept of `Categories' - generic couplings of a number of classes.
In Perl space, these collections are represented via the Set::Object module. Sets may not have duplicate elements, and cannot contain undef values.
set: see Tangram::Type::Set::FromMany (implementing an unordered N to N relationship, with all objects sharing a common base class)
set
iset: see Tangram::Type::Set::FromOne (implementing an unordered 1 to N relationship, with all objects sharing a common base class)
iset
The addition to Sets, you can have `Arrays' of objects, represented by a standard Perl array in memory. Arrays may contain undef values (in the middle of the list), and the array type may contain duplicates (ie, the same element present in seperate places in the list).
array
array : see Tangram::Type::Array::FromMany (implementing an ordered N to N relationship, with all objects sharing a common base class)
iarray: see Tangram::Type::Array::FromOne (implementing an ordered 1 to N relationship, with all objects sharing a common base class)
iarray
Much like the Array types, the Hash types are indexed via a string value, and represented as a Perl hash in memory. These hashes may not contain undef values (those are dropped). The hash type may contain duplicate elements.
hash
hash : see Tangram::Type::Hash::FromMany (implementing a keyed N to N relationship, with all objects sharing a common base class)
ihash: see Tangram::Type::Hash::FromOne (implementing a keyed 1 to N relationship, with all objects sharing a common base class)
ihash
To install Tangram, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Tangram
CPAN shell
perl -MCPAN -e shell install Tangram
For more information on module installation, please visit the detailed CPAN module installation guide.