Database mapping database-mapping

The SQL mapping of our example schema gives the following XML document:

<schema mappingType="sql" name="recipient" namespace="cus" xtkschema="xtk:schema">
  <enumeration basetype="byte" name="gender">
    <value label="Not specified" name="unknown" value="0"/>
    <value label="Male" name="male" value="1"/>
    <value label="Female" name="female" value="2"/>
  </enumeration>

  <element name="recipient" sqltable="CusRecipient">
    <attribute desc="Recipient e-mail address" label="Email" length="80" name="email" sqlname="sEmail" type="string"/>
    <attribute default="GetDate()" label="Date of creation" name="created" sqlname="tsCreated" type="datetime"/>
    <attribute enum="gender" label="Gender" name="gender" sqlname="iGender" type="byte"/>
    <element label="Location" name="location">
      <attribute label="City" length="50" name="city" sqlname="sCity" type="string" userEnum="city"/>
    </element>
  </element>
</schema>

Description description

The root element of the schema is no longer <srcschema>, but <schema>.

This takes us to another type of document, which is generated automatically from the source schema, simply referred to as the schema. This schema will be used by the Adobe Campaign application.

The SQL names are determined automatically based on element name and type.

The SQL naming rules are as follows:

The SQL script to create the table generated from the extended schema is as follows:

CREATE TABLE CusRecipient(
  iGender NUMERIC(3) NOT NULL Default 0,
  sCity VARCHAR(50),
  sEmail VARCHAR(80),
  tsCreated TIMESTAMP Default NULL);

The SQL field constraints are as follows:

XML fields xml-fields

By default, any typed <attribute> and <element> element is mapped onto an SQL field of the data schema table. You can, however, reference this field in XML instead of SQL, which means that the data is stored in a memo field (“mData”) of the table containing the values of all XML fields. The storage of these data is an XML document that observes the schema structure.

To populate a field in XML, you must add the xml attribute with the value “true” to the element concerned.

Examples

The use of XML fields lets you add fields without needing to modify the physical structure of the database. Another advantage is that you use less resources (size allocated to SQL fields, limit on the number of fields per table, etc.).