secondo/Algebras/DBService2/DBService.examples

Database : berlintest
Restore  : No

Operator  : write
Number    : 1
Signature : stream(tuple(X)) x string x bool -> rel(tuple(X))
Example   : query strassen feed write["strassenFT", FALSE] count = strassen count
Result    : TRUE
Remark    : Requires a DBService system

Operator  : addnode
Number    : 1
Signature : string x int x string -> bool
Example   : query addnode("host", 1234, "config")
Result    : unpredictable 
Remark    : Result depends on the presemce of the DBServive

Operator  : checkdbservicestatus
Number    : 1
Signature : -> text
Example   : query length(checkdbservicestatus()) > -1
Result    : TRUE
Remark    : None

Operator  : initdbserviceworker
Number    : 1
Signature : -> bool
Example   : query initdbserviceworker()
Result    : TRUE
Remark    : For internal usage only

Operator  : getconfigparam
Number    : 1
Signature : string x string -> string
Example   : query getconfigparam("DBService", "DBServiceHost")
Result    : unpredictable
Remark    : Result depends on the content of the SecondoConfig.ini file

Operator  : read
Number    : 1
Signature : rel(tuple(X)) -> stream(tuple(X))
Example   : query read(plz) count = plz count
Result    : TRUE

Operator  : read2
Number    : 1
Signature : rel(tuple(X)) x map(stream(tuple(X)) -> stream(tuple(Y))  -> stream(tuple(Y))
Example   : query plz read2[ . filter[.PLZ > 5000] project[Ort] ] = plz feed filter[.PLZ > 5000] project[Ort]
Result    : TRUE

Operator  : read3
Number    : 1
Signature : rel(tuple(X)) x map(rel(tuple(X)) -> stream(tuple(Y))  -> stream(tuple(Y))
Example   : query plz read3[ . feed filter[.PLZ > 5000] project[Ort] ] = plz feed filter[.PLZ > 5000] project[Ort]
Result    : TRUE

Operator  : ddelete
Number    : 1
Signature : string x bool -> bool
Example   : query ddelete("myRelation", TRUE)
Result    : unpredictable 
Remark    : Result depends on the presence of the DBService

Operator  : settracelevel
Number    : 1
Signature : int -> bool
Example   : query settracelevel(0)
Result    : TRUE
Remark    : None

Operator  : pingdbservice
Number    : 1
Signature : -> bool
Example   : query pingdbservice()
Result    : unpredictable 
Remark    : result depends on the presence of the db service

Operator  : startdbservice
Number    : 1
Signature : -> bool
Example   : query startdbservice()
Result    : unpredictable
Remark    : Result depends on the presence of DBService configuration

Operator  : testdbservice
Number    : 1
Signature : -> bool
Example   : query testdbservice()
Result    : TRUE
Remark    : Requires an empty database named "dbservice_test" to be opened.

Operator : rderive
Number   : 1
Signature : rel x string x fun(rel->X) -> X 
Example   : query plz rderive["plz_count", . count] = plz count
Result    : TRUE
Remark    : Requires running DBService

Operator  : read3_1
Number    : 1
Signature : rel x K x fun(rel x K -> stream(tuple(X))) -> stream(tuple(X))
Example   : query (plz plz_PLZ_btree read3_1[.. . exactmatch[1000]] count) =  (plz feed filter[.PLZ=1000] count)
Result    : TRUE

Operator  : read3_2
Number    : 1
Signature : rel x K1 x K2 x fun(rel x K1 x K2 -> stream(tuple(X))) -> stream(tuple(X))
Example   : query plz plz_PLZ plz_Ort read3_2[ .. leftrangeS[5000] sort $3 rightrangeS["G"] sort mergesec . gettuples] count
Result    : 1447


Operator : useincrementalmetadataupdate
Number   : 1
Signature : bool -> bool
Example   : query useincrementalmetadataupdate(TRUE)
Result    : unpredictable 
Remark    : depends on default mode

Operator : ddeleteDB
Number   : 1
Signature : -> bool | string -> bool
Example   : query ddeleteDB("unknown");
Result    : unpredictable
Remark    : Result depends on the presence of a db service