Fix xslt_process() to ensure that it inserts a NULL terminator after the

[PostgreSQL.git] / src / pl / tcl / sql / pltcl_setup.sql

--
-- Create the tables used in the test queries
--
-- T_pkey1 is the primary key table for T_dta1. Entries from T_pkey1
-- Cannot be changed or deleted if they are referenced from T_dta1.
--
-- T_pkey2 is the primary key table for T_dta2. If the key values in
-- T_pkey2 are changed, the references in T_dta2 follow. If entries
-- are deleted, the referencing entries from T_dta2 are deleted too.
-- The values for field key2 in T_pkey2 are silently converted to
-- upper case on insert/update.
--
create table T_pkey1 (
    key1        int4,
    key2        char(20),
    txt         char(40)
);

create table T_pkey2 (
    key1        int4,
    key2        char(20),
    txt         char(40)
);

create table T_dta1 (
    tkey        char(10),
    ref1        int4,
    ref2        char(20)
);

create table T_dta2 (
    tkey        char(10),
    ref1        int4,
    ref2        char(20)
);


--
-- Function to check key existance in T_pkey1
--
create function check_pkey1_exists(int4, bpchar) returns bool as E'
    if {![info exists GD]} {
        set GD(plan) [spi_prepare                               \\
            "select 1 from T_pkey1                              \\
                where key1 = \\$1 and key2 = \\$2"              \\
            {int4 bpchar}]
    }
    
    set n [spi_execp -count 1 $GD(plan) [list $1 $2]]

    if {$n > 0} {
        return "t"
    }
    return "f"
' language pltcl;


-- dump trigger data

CREATE TABLE trigger_test
    (i int, v text );

CREATE FUNCTION trigger_data() returns trigger language pltcl as $_$

        if { [info exists TG_relid] } {
        set TG_relid "bogus:12345"
        }

        set dnames [info locals {[a-zA-Z]*} ]

        foreach key [lsort $dnames] {
    
                if { [array exists $key] } { 
                        set str "{"
                        foreach akey [lsort [ array names $key ] ] {
                                if {[string length $str] > 1} { set str "$str, " }
                                set cmd "($akey)"
                                set cmd "set val \$$key$cmd"
                                eval $cmd
                                set str "$str$akey: $val"
                        }
                        set str "$str}"
                elog NOTICE "$key: $str"
                } else {
                        set val [eval list "\$$key" ]
                elog NOTICE "$key: $val"
                }
        }


        return OK  

$_$;

CREATE TRIGGER show_trigger_data_trig 
BEFORE INSERT OR UPDATE OR DELETE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');


--
-- Trigger function on every change to T_pkey1
--
create function trig_pkey1_before() returns trigger as E'
    #
    # Create prepared plans on the first call
    #
    if {![info exists GD]} {
        #
        # Plan to check for duplicate key in T_pkey1
        #
        set GD(plan_pkey1) [spi_prepare                         \\
            "select check_pkey1_exists(\\$1, \\$2) as ret"      \\
            {int4 bpchar}]
        #
        # Plan to check for references from T_dta1
        #
        set GD(plan_dta1) [spi_prepare                          \\
            "select 1 from T_dta1                               \\
                where ref1 = \\$1 and ref2 = \\$2"              \\
            {int4 bpchar}]
    }

    #
    # Initialize flags
    #
    set check_old_ref 0
    set check_new_dup 0

    switch $TG_op {
        INSERT {
            #
            # Must check for duplicate key on INSERT
            #
            set check_new_dup 1
        }
        UPDATE {
            #
            # Must check for duplicate key on UPDATE only if
            # the key changes. In that case we must check for
            # references to OLD values too.
            #
            if {[string compare $NEW(key1) $OLD(key1)] != 0} {
                set check_old_ref 1
                set check_new_dup 1
            }
            if {[string compare $NEW(key2) $OLD(key2)] != 0} {
                set check_old_ref 1
                set check_new_dup 1
            }
        }
        DELETE {
            #
            # Must only check for references to OLD on DELETE
            #
            set check_old_ref 1
        }
    }

    if {$check_new_dup} {
        #
        # Check for duplicate key
        #
        spi_execp -count 1 $GD(plan_pkey1) [list $NEW(key1) $NEW(key2)]
        if {$ret == "t"} {
            elog ERROR \\
                "duplicate key ''$NEW(key1)'', ''$NEW(key2)'' for T_pkey1"
        }
    }

    if {$check_old_ref} {
        #
        # Check for references to OLD
        #
        set n [spi_execp -count 1 $GD(plan_dta1) [list $OLD(key1) $OLD(key2)]]
        if {$n > 0} {
            elog ERROR \\
                "key ''$OLD(key1)'', ''$OLD(key2)'' referenced by T_dta1"
        }
    }

    #
    # Anything is fine - let operation pass through
    #
    return OK
' language pltcl;


create trigger pkey1_before before insert or update or delete on T_pkey1
        for each row execute procedure
        trig_pkey1_before();


--
-- Trigger function to check for duplicate keys in T_pkey2
-- and to force key2 to be upper case only without leading whitespaces
--
create function trig_pkey2_before() returns trigger as E'
    #
    # Prepare plan on first call
    #
    if {![info exists GD]} {
        set GD(plan_pkey2) [spi_prepare                         \\
            "select 1 from T_pkey2                              \\
                where key1 = \\$1 and key2 = \\$2"              \\
            {int4 bpchar}]
    }

    #
    # Convert key2 value
    #
    set NEW(key2) [string toupper [string trim $NEW(key2)]]

    #
    # Check for duplicate key
    #
    set n [spi_execp -count 1 $GD(plan_pkey2) [list $NEW(key1) $NEW(key2)]]
    if {$n > 0} {
        elog ERROR \\
            "duplicate key ''$NEW(key1)'', ''$NEW(key2)'' for T_pkey2"
    }

    #
    # Return modified tuple in NEW
    #
    return [array get NEW]
' language pltcl;


create trigger pkey2_before before insert or update on T_pkey2
        for each row execute procedure
        trig_pkey2_before();


--
-- Trigger function to force references from T_dta2 follow changes
-- in T_pkey2 or be deleted too. This must be done AFTER the changes
-- in T_pkey2 are done so the trigger for primkey check on T_dta2
-- fired on our updates will see the new key values in T_pkey2.
--
create function trig_pkey2_after() returns trigger as E'
    #
    # Prepare plans on first call
    #
    if {![info exists GD]} {
        #
        # Plan to update references from T_dta2
        #
        set GD(plan_dta2_upd) [spi_prepare                      \\
            "update T_dta2 set ref1 = \\$3, ref2 = \\$4         \\
                where ref1 = \\$1 and ref2 = \\$2"              \\
            {int4 bpchar int4 bpchar}]
        #
        # Plan to delete references from T_dta2
        #
        set GD(plan_dta2_del) [spi_prepare                      \\
            "delete from T_dta2                                 \\
                where ref1 = \\$1 and ref2 = \\$2"              \\
            {int4 bpchar}]
    }

    #
    # Initialize flags
    #
    set old_ref_follow 0
    set old_ref_delete 0

    switch $TG_op {
        UPDATE {
            #
            # On update we must let old references follow
            #
            set NEW(key2) [string toupper $NEW(key2)]

            if {[string compare $NEW(key1) $OLD(key1)] != 0} {
                set old_ref_follow 1
            }
            if {[string compare $NEW(key2) $OLD(key2)] != 0} {
                set old_ref_follow 1
            }
        }
        DELETE {
            #
            # On delete we must delete references too
            #
            set old_ref_delete 1
        }
    }

    if {$old_ref_follow} {
        #
        # Let old references follow and fire NOTICE message if
        # there where some
        #
        set n [spi_execp $GD(plan_dta2_upd) \\
            [list $OLD(key1) $OLD(key2) $NEW(key1) $NEW(key2)]]
        if {$n > 0} {
            elog NOTICE \\
                "updated $n entries in T_dta2 for new key in T_pkey2"
        }
    }

    if {$old_ref_delete} {
        #
        # delete references and fire NOTICE message if
        # there where some
        #
        set n [spi_execp $GD(plan_dta2_del) \\
            [list $OLD(key1) $OLD(key2)]]
        if {$n > 0} {
            elog NOTICE \\
                "deleted $n entries from T_dta2"
        }
    }

    return OK
' language pltcl;


create trigger pkey2_after after update or delete on T_pkey2
        for each row execute procedure
        trig_pkey2_after();


--
-- Generic trigger function to check references in T_dta1 and T_dta2
--
create function check_primkey() returns trigger as E'
    #
    # For every trigger/relation pair we create
    # a saved plan and hold them in GD
    #
    set plankey [list "plan" $TG_name $TG_relid]
    set planrel [list "relname" $TG_relid]

    #
    # Extract the pkey relation name
    #
    set keyidx [expr [llength $args] / 2]
    set keyrel [string tolower [lindex $args $keyidx]]

    if {![info exists GD($plankey)]} {
        #
        # We must prepare a new plan. Build up a query string
        # for the primary key check.
        #
        set keylist [lrange $args [expr $keyidx + 1] end]

        set query "select 1 from $keyrel"
        set qual " where"
        set typlist ""
        set idx 1
        foreach key $keylist {
            set key [string tolower $key]
            #
            # Add the qual part to the query string
            #
            append query "$qual $key = \\$$idx"
            set qual " and"

            #
            # Lookup the fields type in pg_attribute
            #
            set n [spi_exec "select T.typname                   \\
                from pg_catalog.pg_type T, pg_catalog.pg_attribute A, pg_catalog.pg_class C     \\
                where C.relname  = ''[quote $keyrel]''          \\
                  and C.oid      = A.attrelid                   \\
                  and A.attname  = ''[quote $key]''             \\
                  and A.atttypid = T.oid"]
            if {$n != 1} {
                elog ERROR "table $keyrel doesn''t have a field named $key"
            }

            #
            # Append the fields type to the argument type list
            #
            lappend typlist $typname
            incr idx
        }

        #
        # Prepare the plan
        #
        set GD($plankey) [spi_prepare $query $typlist]

        #
        # Lookup and remember the table name for later error messages
        #
        spi_exec "select relname from pg_catalog.pg_class       \\
                where oid = ''$TG_relid''::oid"
        set GD($planrel) $relname
    }

    #
    # Build the argument list from the NEW row
    #
    incr keyidx -1
    set arglist ""
    foreach arg [lrange $args 0 $keyidx] {
        lappend arglist $NEW($arg)
    }

    #
    # Check for the primary key
    #
    set n [spi_execp -count 1 $GD($plankey) $arglist]
    if {$n <= 0} {
        elog ERROR "key for $GD($planrel) not in $keyrel"
    }

    #
    # Anything is fine
    #
    return OK
' language pltcl;


create trigger dta1_before before insert or update on T_dta1
        for each row execute procedure
        check_primkey('ref1', 'ref2', 'T_pkey1', 'key1', 'key2');


create trigger dta2_before before insert or update on T_dta2
        for each row execute procedure
        check_primkey('ref1', 'ref2', 'T_pkey2', 'key1', 'key2');


create function tcl_int4add(int4,int4) returns int4 as '
    return [expr $1 + $2]
' language pltcl;

-- We use split(n) as a quick-and-dirty way of parsing the input array
-- value, which comes in as a string like '{1,2}'.  There are better ways...

create function tcl_int4_accum(int4[], int4) returns int4[] as '
    set state [split $1 "{,}"]
    set newsum [expr {[lindex $state 1] + $2}]
    set newcnt [expr {[lindex $state 2] + 1}]
    return "{$newsum,$newcnt}"
' language pltcl;

create function tcl_int4_avg(int4[]) returns int4 as '
    set state [split $1 "{,}"]
    if {[lindex $state 2] == 0} { return_null }
    return [expr {[lindex $state 1] / [lindex $state 2]}]
' language pltcl;

create aggregate tcl_avg (
                sfunc = tcl_int4_accum,
                basetype = int4,
                stype = int4[],
                finalfunc = tcl_int4_avg,
                initcond = '{0,0}'
        );

create aggregate tcl_sum (
                sfunc = tcl_int4add,
                basetype = int4,
                stype = int4,
                initcond1 = 0
        );

create function tcl_int4lt(int4,int4) returns bool as '
    if {$1 < $2} {
        return t
    }
    return f
' language pltcl;

create function tcl_int4le(int4,int4) returns bool as '
    if {$1 <= $2} {
        return t
    }
    return f
' language pltcl;

create function tcl_int4eq(int4,int4) returns bool as '
    if {$1 == $2} {
        return t
    }
    return f
' language pltcl;

create function tcl_int4ge(int4,int4) returns bool as '
    if {$1 >= $2} {
        return t
    }
    return f
' language pltcl;

create function tcl_int4gt(int4,int4) returns bool as '
    if {$1 > $2} {
        return t
    }
    return f
' language pltcl;

create operator @< (
                leftarg = int4,
                rightarg = int4,
                procedure = tcl_int4lt
        );

create operator @<= (
                leftarg = int4,
                rightarg = int4,
                procedure = tcl_int4le
        );

create operator @= (
                leftarg = int4,
                rightarg = int4,
                procedure = tcl_int4eq
        );

create operator @>= (
                leftarg = int4,
                rightarg = int4,
                procedure = tcl_int4ge
        );

create operator @> (
                leftarg = int4,
                rightarg = int4,
                procedure = tcl_int4gt
        );

create function tcl_int4cmp(int4,int4) returns int4 as '
    if {$1 < $2} {
        return -1
    }
    if {$1 > $2} {
        return 1
    }
    return 0
' language pltcl;

CREATE OPERATOR CLASS tcl_int4_ops
        FOR TYPE int4 USING btree AS
        OPERATOR 1  @<,
        OPERATOR 2  @<=,
        OPERATOR 3  @=,
        OPERATOR 4  @>=,
        OPERATOR 5  @>,
        FUNCTION 1  tcl_int4cmp(int4,int4) ;