DOC-4305 added opcode example

Author: andy-stark-redis

content/integrate/redis-data-integration/data-pipelines/transform-examples/redis-opcode-example.md

@@ -0,0 +1,50 @@
+---
+Title: Add the opcode to the Redis output
+alwaysopen: false
+categories:
+- docs
+- integrate
+- rs
+- rdi
+description: null
+group: di
+linkTitle: Add the opcode to the Redis output
+summary: Redis Data Integration keeps Redis in sync with the primary database in near
+  real time.
+type: integration
+weight: 100
+---
+
+In the example below, the data is captured from the source table named `employee` and is written to the Redis database as a JSON document. When you specify the `data_type` parameter for the job, it overrides the system-wide setting `target_data_type` defined in `config.yaml`. 
+
+Here, the result will be Redis JSON documents with fields captured from the source table
+(`employeeid`, `firstname`, `lastname`) and also with
+an extra field `my_opcode` added using the `merge` update strategy (see the
+[JSON job example]({{< relref "/integrate/redis-data-integration/data-pipelines/transform-examples/redis-json-example" >}})
+for more information). The `opcode` expression refers to the operation code captured from
+the source. This is a database-specific value that indicates which type of operation generated
+the change (insert, update, etc).
+
+```yaml
+source:
+  schema: public
+  table: employee
+  row_format: full
+transform:
+  - uses: add_field
+    with:
+      field: after.my_opcode
+      expression: opcode
+      language: jmespath
+output:
+  - uses: redis.write
+    with:
+      data_type: json
+      mapping:
+        - employeeid
+        - firstname
+        - lastname
+        - my_opcode
+      connection: target
+      on_update: merge
+```