doc_update/updating-doc-related-to-dsnexec-commnds-for-DDL-queries (#188

)

dsnexec/README.md

@@ -35,4 +35,7 @@ Commands:
 
     args:       An array of arguments to the SQL command. The args are parsed with
                 the golang text/template package with the sources map as the
-                template context.
+                template context. 
+                (Note - If you intent to fire DDL queries, then put full go template expressions in the command. 
+                As unlike for DML queries, underlying prepare statement does not consider arguments passed when the query is DDL.)
+

dsnexec/config.yaml

@@ -48,6 +48,12 @@ configs:
       driver: hotload
       dsn: fsnotify://postgres/path/to/myfile.txt
     commands:
-    - command: ALTER SERVER myserver OPTIONS (SET host=?);
+    - command: INSERT INTO table1 values ($1, $2);
       args:
-      - '{{ index . "test/source.json" "host" }}'
+      - '{{ index . "test/source.json" "host" }}'
+      - '{{ index . "test/source.json" "port" }}'
+
+    # As the below query is DDL, unlike insert (DML) written above, we can not pass arguments here. 
+    # We need to put full go template expressions in the command itself
+    - command: ALTER SERVER myserver OPTIONS (SET host '{{ index . "test/source.json" "host" }}' );
+      args: []