Difference between revisions of "Hello world and hello Texas from Database"

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Install VistA with something like Astronaut. Get to a Mumps prompt: choose item 3 if you are using VistA Commander.
 
Install VistA with something like Astronaut. Get to a Mumps prompt: choose item 3 if you are using VistA Commander.
 
   
 
   
MUMPS>write "hello world"
+
MUMPS>write "hello world"
 
  hello world
 
  hello world
MUMPS>write "hello " write $P(^DIC(5,48,0),"^",1)
+
MUMPS>write "hello " write $P(^DIC(5,48,0),"^",1)
 
  hello TEXAS
 
  hello TEXAS
  
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* Invokes the $P[iece] command, which is similar to but not exactly like the substring command in many other languages.
 
* Invokes the $P[iece] command, which is similar to but not exactly like the substring command in many other languages.
 
* The ^ indicates that this is not a local variable; MUMPS will look for a [[Global~|global]] stored on disk and visible to other users.
 
* The ^ indicates that this is not a local variable; MUMPS will look for a [[Global~|global]] stored on disk and visible to other users.
* DIC's subscripts say to look in the data DICtionary in file 5, field 48, item 0.
+
* DIC is the data dictionary, and the subscripts say to look in file 5, field 48, item 0.
 
* Then $P uses the ^ in this case as a delimiter, and returns the first piece.
 
* Then $P uses the ^ in this case as a delimiter, and returns the first piece.
 
* Since ^DIC(5,48,0)="TEXAS^TX^48^^1^1", MUMPS writes "TEXAS".
 
* Since ^DIC(5,48,0)="TEXAS^TX^48^^1^1", MUMPS writes "TEXAS".

Revision as of 18:44, 9 February 2010

Install VistA with something like Astronaut. Get to a Mumps prompt: choose item 3 if you are using VistA Commander.

MUMPS>write "hello world"
hello world
MUMPS>write "hello " write $P(^DIC(5,48,0),"^",1)
hello TEXAS

What the above hello TEXAS line does:

  • Invokes the $P[iece] command, which is similar to but not exactly like the substring command in many other languages.
  • The ^ indicates that this is not a local variable; MUMPS will look for a global stored on disk and visible to other users.
  • DIC is the data dictionary, and the subscripts say to look in file 5, field 48, item 0.
  • Then $P uses the ^ in this case as a delimiter, and returns the first piece.
  • Since ^DIC(5,48,0)="TEXAS^TX^48^^1^1", MUMPS writes "TEXAS".