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I have a PL/SQL trigger:

1    create or replace trigger "projects_to_meas_trig" before update of asset_id 
2    on projects
3    
4    for each row
5    declare
6        v_length number;
7    begin
8        if :new.asset_class = 3 then
9            select sde.st_length(shape)
10            into v_length
11            from user1.roads
12            where  road_id = :new.asset_id;
13    
14            :new.to_meas := v_length;
15        end if;
16    end;

At line #9, when I try to use the st_length function, I get this error:

Error(4): PLS-00707: unsupported construct or internal error [2603]

Why can't I use the st_geometry function in a PL/SQL trigger?

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I needed to "fully qualify the package":

select sde.st_geometry_operators.st_length_f(shape)  <-- Don't forget the _f at the end

Interestingly, just adding .st_geometry also seems to work. I discovered this by accident:

 select sde.st_geometry.st_length(shape)

From the documentation:

Because the st_geometry functions are exposed as database operators, and typically consumed by way of SQL statements, leveraging the st_geometry functionality with PL/SQL requires referencing the underlying functions by fully qualifying their appropriate package and function name.

Procedure:

For example, to leverage the sde st_astext operator in PL/SQL, the call must reference the fully qualified package where the function resides. The following line of code demonstrates setting a local variable of type CLOB to the output of the st_astext function.

Code:

local_geometry_wkt := sde.st_geometry_operators.st_astext_f(in_st_geom_feature);

All geometry operators, such as st_astext, st_centroid, st_numgeometries, etc. reside in the st_geometry_operators package. All relational operators, such as st_intersects, st_within, st_contains, etc. reside in the st_relation_operators package.

Note: When referencing any st_* operator as a function, remember to include the _f clause after its name to reference the appropriate function in the package body.

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