Schemas
Set of APIs for dealing with schemas defined in Control.
Schemas loaded from Control will automatically register meta information in the .schema data structures;
q).schema.cols[`dxAlert]
`time`sym`alertkey`triggered`source`tag1`tag2`description`data
q).schema.tab[`dxAlert]
time sym alertkey triggered source tag1 tag2 description data
-------------------------------------------------------------.tbl.compareTableWithSchema
Compare in-memory table to Control version
Syntax: .tbl.compareTableWithSchema[tabName;configProfile;scemaName]
Where
tabNameis the name of a table to compare (symbol)configProfileis a config profile as a symbol. Use a null symbol or.ex.configprofile.schemaNameis a schema name as a symbol
returns a table of meta info joined from both tables. See example for full format:
q).tbl.compareTableWithSchema[`dfxTrade; `; `dfxTrade]
column idx dataType dataTypeChar attribute columnNew idxNew dataTypeNew dataTypeCharNew attributeNew defaultNew
-----------------------------------------------------------------------------------------------------------------
time 0 Timestamp p time 0 Timestamp p 0Np
sym 1 Symbol s g sym 1 Symbol s g `
price 2 Float f price 2 Float f 0n
size 3 Integer i size 3 Integer i 0Ni
seqNum 4 Long j seqNum 4 Long j 0N
src 5 Symbol s src 5 Symbol s `
srcTime 6 Timestamp p srcTime 6 Timestamp p 0Np
cond 7 Symbol s cond 7 Symbol s `
status 8 Symbol s status 8 Symbol s `
side 9 Character c side 9 Character c " "
msgrcv 10 Timestamp p msgrcv 10 Timestamp p 0Np.tbl.getloadedschemas
List of loaded schemas
Syntax: .tbl.getloadedschemas[]
Returns schema names as a symbol list.
q).tbl.getLoadedSchemas[]
`dfxAsk`dfxBbo`dfxBid`dfxBookSnapshot`dfxOrder`dfxQuote`dfxQuote_midprice`dfxTrade...tbl.getinfo
Schema metadata at the version the process is operating at
Syntax: .tbl.getinfo tbls
Where tbls is schema names as a symbol list returns a table of schema metadata.
If tbls is empty, information on all schemas is returned.
q).tbl.getinfo[`schema1]
table keycols colnames coltype colattr tablegroup
------------------------------------------------------------------------
schema1 time sym src Timestamp Symbol Symbol g dtxFX.tbl.gettable
Load a schema into memory
Syntax: .tbl.gettable sn
Where sn is the name of a schema as a symbol,
loads the schema into memory.
q).tbl.gettable[`dfxTrade].tbl.gettabledetails
Schema metadata
Syntax: .tbl.gettabledetails sn
Where sn is the name of a schema as a symbol,
returns a dictionary of schema metadata.
Executed on Control as deltacomponent.
If deltacomponent is configured to be a non-Administrator user then the results will be subject to a permission check.
q).tbl.gettabledetails[`dfxTrade]
ucname | `delta_install_default
table | `dfxTrade
keycols | `symbol$()
description | "Schema for the dfxTrade table"
colnames | `time`sym`price`size`seqNum`src`srcTime`cond`status`side`msgrcv
coltype | `Timestamp`Symbol`Float`Integer`Long`Symbol`Timestamp`Symbol`Symbol`Character`Timestamp
default | ("";"";"";"";"";"";"";"";"";"";"")
colattr | ``g`````````
coldesc | ("";"";"";"";"";"";"";"";"";"";"")
schemagroups| ,`dtxFX.tbl.gettablesbygroup
List schemas for a group
Syntax: .tbl.gettablesbygroup gn
Where gn is the name of a schema group as a symbol, returns the schema names for that group as a symbol list.
q).tbl.gettablesbygroup[`DM_Monitoring]
`.yday.dmxJobScheduling`.yday.dmxJobSummary`dmxFileChange`dmxFiles`dmxJobScheduling`dmxJobSummary`dmxPing...tbl.loadgrouptables
Load all schemas for a group
Syntax: .tbl.loadgrouptables gn
Where gn is the name of a schema group as a symbol, loads all schemas for that group.
q).tbl.loadgrouptables[`dtxFX].tbl.loadtables
Load a list of schemas
Syntax: .tbl.loadtables sns
Where sns is a list of schema names as a symbol vector, loads the schemas.
q).tbl.loadtables[`dfxTrade`dfxQuote].tbl.regTab
Register meta information for a table
Syntax: .tbl.regTab sn
Where sn is the name of a table as a symbol, populates the table schema and columns in .schema.tab and .schema.cols respectively.
Structures can be accessed directly.
Handled automatically for schemas loaded from Control.
q).tbl.regTab[`dxQuote]