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~|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 | ||
| + | MUMPS>write "hello ",$$GET1^DIQ(5,48,0.01,,,"ZERROR") | ||
hello TEXAS | hello TEXAS | ||
| − | What the | + | What the first hello TEXAS line does: |
| − | * Invokes the $P[iece] | + | * Invokes the [[MUMPS Functions $PIECE|Mumps function $P[iece]]], which is similar to but not exactly like the substring command in many other languages. |
| − | * The ^ indicates that this is not a local variable; | + | * The ^ indicates that this is not a local variable; Mumps will look for a [[Global~|global]] stored on disk and visible to other users. |
| − | * DIC | + | * The global DIC holds the [[File Of Files~|File of Files]], but ^DIC with the subscript 5 says to look in file 5 (The STATE File) |
| + | * The ^DIC(5, is followed by a 48, which means entry 48 in the STATE File. | ||
| + | * The ^DIC(5,48, is followed by 0 because the NAME Field is stored in node 0 and the first piece. | ||
* Then $P uses the ^ in this case as a delimiter, and returns the first piece. | * Then $P uses the ^ in this case as a delimiter, and returns the first piece. | ||
* Since ^DIC(5,48,0)="TEXAS^TX^48^^1^1", MUMPS writes "TEXAS". | * Since ^DIC(5,48,0)="TEXAS^TX^48^^1^1", MUMPS writes "TEXAS". | ||
| + | |||
| + | What the second hello TEXAS line does: | ||
| + | |||
| + | * invokes a FileMan function named $$GET1^DIQ which does the same thing as the first hello TEXAS line. | ||
| + | & the first argument is the number of the file as the source of data. | ||
Latest revision as of 23:06, 21 November 2016
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 MUMPS>write "hello ",$$GET1^DIQ(5,48,0.01,,,"ZERROR") hello TEXAS
What the first hello TEXAS line does:
- Invokes the Mumps function $P[iece], which is similar to but not exactly like the substring command in many other languages.
- The ^ indicates that this is not a local variable; Mumps will look for a global stored on disk and visible to other users.
- The global DIC holds the File of Files, but ^DIC with the subscript 5 says to look in file 5 (The STATE File)
- The ^DIC(5, is followed by a 48, which means entry 48 in the STATE File.
- The ^DIC(5,48, is followed by 0 because the NAME Field is stored in node 0 and the first piece.
- Then $P uses the ^ in this case as a delimiter, and returns the first piece.
- Since ^DIC(5,48,0)="TEXAS^TX^48^^1^1", MUMPS writes "TEXAS".
What the second hello TEXAS line does:
- invokes a FileMan function named $$GET1^DIQ which does the same thing as the first hello TEXAS line.
& the first argument is the number of the file as the source of data.
