Difference between revisions of "Hello world and hello Texas from Database"
From VistApedia
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What the above hello TEXAS line does: | What the above hello TEXAS line does: | ||
| − | * Invokes the $P[iece] | + | * Invokes the [[MUMPS Functions $PIECE|Mumps function $P[iece]]], which is similar to but not exactly like the substring command in many other languages. |
| − | * The ^ indicates that this is not a local variable; | + | * 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 is the data dictionary, and the subscripts say to look in file 5, field 48, item 0. | + | * DIC is the [[Data Dictionary~|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 20:15, 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 Mumps function $P[iece], 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".
