ECSQL Built-In functions

ECSQL allows use of these built-in functions:

1. ec_classname() - Gets the formatted/qualified class name, given ECClassId as input
2. ec_classid()) - Gets ECClassId, given a formatted/qualified class name as input

ec_classname(ecclassId[,format-string | format-id)

For the specified ecClassId, returns the class name as a string formatted according to the specified format-string

Parameters

ecclassId: An integer which could be a constant, column or a parameter. format-string | format-id: Optional format specifier and could be one of the following values. NULL is also valid value -- this is the same as not specifying the second parameter at all

Returns

className as specified by format, or NULL if it was unable to resolve ECClassId, or if the format specifier was not recognized.

Note that this can also cause ECSqlStatement::Step() to return BE_SQLITE_ERROR if the incorrect number of arguments was passed in.

Example

-- returns schema-name:classname
SELECT ec_classname(ECClassId, 's:c') FROM bis:Element

-- same as 'sa:cn' - returns schema-alias:classname
SELECT ec_classname(ECClassId, 1) FROM bis:Element

-- returns schema-name, after filtering on it
SELECT * FROM bis:Element WHERE ec_classname(ECClassId, 's') = 'BisCore'

-- returns schema-alias after filtering on it
SELECT * FROM bis:Element WHERE ec_classname(ECClassId, 3) = 'bis'

-- only get classname and filter on classname
SELECT * FROM bis:Element WHERE ec_classname(ECClassId, 'c') = 'PUMP'

ec_classId('schema-name-or-alias : | . classname' )

For the specified (qualified) class name, returns the ECCassId.

Note that this function can also take in two arguments - in the following form where schema-name-or-alias and classname can be specified separately. ec_classid[ '<schema-name-or-alias>', '<classname>')

Parameters

Can take either one or two parameters: schema-name-or-alias: Schema name or alias e.g. bis (alias) or BisCore (name) class-name: Name of the class e.g. Element

Returns

The function return a integer ECClassId or NULL if the name could not be resolved.

Note that this can also cause ECSqlStatement::Step() to return BE_SQLITE_ERROR if the incorrect number of arguments was passed in.

Example

-- alias or schema name both can be specified
SELECT * FROM bis.Element WHERE ECClassId IN (ec_classid('opm.PUMP'), ec_classid('opm.VALVE'))
SELECT * FROM bis.Element WHERE ECClassId IN (ec_classid('OpenPlant.PUMP'), ec_classid('OpenPlant.VALVE'))

-- both '.' and ':' delimiter can be used
SELECT * FROM bis.Element WHERE ECClassId IN (ec_classid('opm:PUMP'), ec_classid('opm:VALVE'))
SELECT * FROM bis.Element WHERE ECClassId IN (ec_classid('OpenPlant:PUMP'), ec_classid('OpenPlant:VALVE'))

-- schema name or alias and class name can be specified as two arguments
SELECT * FROM bis.Element WHERE ECClassId IN (ec_classid('opm', 'PUMP'), ec_classid('opm', 'VALVE'))
SELECT * FROM bis.Element WHERE ECClassId IN (ec_classid('OpenPlant', 'PUMP'), ec_classid('OpenPlant', 'VALVE'))

< Previous

Last Updated: 02 February, 2022