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Hour
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Data Mapping > Data Mapper Functions > By Category > Date Time > Hour

Glossary Item Box

Function Name
Hour
Category
DateTime
Icon
Hour
Description
Retrieve the hour portion of a DateTime value
Inputs
DateTime DateTime value to retrieve hour from
Outputs
Hour Hour value from DateTime input
Properties
None -

Usage

The Data Mapper DateTime Hour function returns the hour portion of a DateTime value. Many applications use DateTime values to record information about events, for example retail or other account transactions. It is often necessary to retrieve particular portions of a DateTime value, such as the hour, or to separate the DateTime into its component parts for the target application. To apply the DateTime Hour function, use the following process:

Create a new Data Mapper file, dragging your XML data source and targets into the editor area. For this example we are using sales_source.xsd, an XML Schema Definition inferred from the following source:

Source XML Copy Code
<sales>
 <purchase>
  <sale_id>9099879823</sale_id>
  <item_ref>ab65gh7hh7</item_ref>
  <customer_id>34522</customer_id>
  <transaction>2003-01-20T07:15:32.42</transaction>
 </purchase>
 <purchase>
  <sale_id>2390865748</sale_id>
  <item_ref>g7hy65tfd3</item_ref>
  <customer_id>12009</customer_id>
  <transaction>2007-06-12T23:35:10.09</transaction>
 </purchase>
 <purchase>
  <sale_id>8250987123</sale_id>
  <item_ref>d4rf54r0op</item_ref>
  <customer_id>28769</customer_id>
  <transaction>2006-11-27T17:20:09.88</transaction>
 </purchase>
</sales>

For our target schema we will be using sales_target.xsd, inferred from the following XML:

Target XML Copy Code
<transactions>
 <sale id="8987612312" item="y6yt5i93e4">
  <cust_id>14398</cust_id>
  <bought_time>20</bought_time>
 </sale>
 <sale id="2090176549" item="i8u7b45f7y">
  <cust_id>23112</cust_id>
  <bought_time>11</bought_time>
 </sale>
 <sale id="2819283722" item="y6yt5i93e4">
  <cust_id>34309</cust_id>
  <bought_time>09</bought_time>
 </sale>
</transactions>

The data models retail transactions, including the DateTime for when a sale was made. Let's assume that in this case we only want to map the hour at which each transaction took place, perhaps for marketing purposes. Here is the Data Mapper with Source and Target imported:

Data Mapper Source and Target

Drag the DateTime Hour function from the Component Palette into the mapping area:

Hour Component

Hour Transform Added

The Hour function takes a single input, the DateTime in question, giving an output comprising the hour portion. The input should be connected to the source item, which will normally be an item in the XML Reader. The output should be connected to the target item, whether an item in the XML Writer or another component in the Mapper, for example if you plan on using the Hour value to sort or filter the data in terms of purchases made at different times of day.

Connect the Hour function input to the "transaction" output in the XML Reader and the Hour output to the "bought_time" input in the XML Writer.

Hour Mapped

Now the only portion of the DateTime mapped will be the hour value. If you want to map more than one part of a DateTime, you can use the other DateTime functions, connecting them each to your source DateTime input and mapping them forward as necessary.

Finally, connect the remaining inputs and outputs:

Input and Output Connections Mapped

We can now execute the transform by pressing Shift-F5 or the Execute button (Execute). The transform is applied and the file we selected as output opens in the editor:

Output XML Copy Code
<transactions>
 <sale id="9099879823" item="ab65gh7hh7">
  <cust_id>34522</cust_id>
  <bought_time>7</bought_time>
 </sale>
 <sale id="2390865748" item="g7hy65tfd3">
  <cust_id>12009</cust_id>
  <bought_time>23</bought_time>
 </sale>
 <sale id="8250987123" item="d4rf54r0op">
  <cust_id>28769</cust_id>
  <bought_time>17</bought_time>
 </sale>
</transactions>

The "bought_time" contains an indicator of the hour at which each transaction was made, represented as a number between 0 and 23.

If you pass a value to the Hour function that is not a DateTime, the Mapper will attempt to parse it. If you pass the Hour function a DateTime value which does not contain an hour portion, the function will output a value of zero by default.

This is a scalar function so the standard rules apply if multiple values are presented to one or more inputs.

See Also