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[ 1707540 ] Dependency problem when modifying AD Columns and Sync.

This commit is contained in:
Heng Sin Low 2007-04-30 15:52:19 +00:00
parent 95e8919c4e
commit 8e7712e41a
2 changed files with 112 additions and 0 deletions
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3
db/ddlutils/postgresql/build.xml
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@ -91,6 +91,9 @@
<antcall target="load">
<param name="file.name" value="${basedir}/functions/trunc.sql" />
</antcall>
<antcall target="load">
<param name="file.name" value="${basedir}/functions/altercolumn.sql" />
</antcall>
<antcall target="load">
<param name="file.name" value="${basedir}/operators.sql" />
</antcall>

109
db/ddlutils/postgresql/functions/altercolumn.sql Normal file
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@ -0,0 +1,109 @@
create or replace function altercolumn(tablename name, columnname name, datatype name,
nullclause varchar, defaultclause varchar) returns void as $$
declare
command text;
viewtext text[];
viewname name[];
dropviews name[];
i int;
j int;
v record;
sqltype text;
sqltype_short text;
typename name;
begin
if datatype is not null then
select pg_type.typname, format_type(pg_type.oid, pg_attribute.atttypmod)
into typename, sqltype
from pg_class, pg_attribute, pg_type
where relname = lower(tablename)
and relkind = 'r'
and pg_class.oid = pg_attribute.attrelid
and attname = lower(columnname)
and atttypid = pg_type.oid;
sqltype_short := sqltype;
if typename = 'numeric' then
sqltype_short := replace(sqltype, ',0', '');
elsif strpos(sqltype,'character varying') = 1 then
sqltype_short := replace(sqltype, 'character varying', 'varchar');
elsif sqltype = 'timestamp without time zone' then
sqltype_short := 'timestamp';
end if;
if lower(datatype) <> sqltype and lower(datatype) <> sqltype_short then
i := 0;
for v in select a.relname, a.oid
from pg_class a, pg_depend b, pg_depend c, pg_class d, pg_attribute e
where a.oid = b.refobjid
and b.objid = c.objid
and b.refobjid <> c.refobjid
and b.deptype = 'n'
and c.refobjid = d.oid
and d.relname = lower(tablename)
and d.relkind = 'r'
and d.oid = e.attrelid
and e.attname = lower(columnname)
and c.refobjsubid = e.attnum
and a.relkind = 'v'
loop
i := i + 1;
viewtext[i] := pg_get_viewdef(v.oid);
viewname[i] := v.relname;
end loop;
if i > 0 then
begin
for j in 1 .. i loop
command := 'drop view ' || viewname[j];
execute command;
dropviews[j] := viewname[j];
end loop;
exception
when others then
i := array_upper(dropviews, 1);
if i > 0 then
for j in 1 .. i loop
command := 'create or replace view ' || dropviews[j] || ' as ' || viewtext[j];
execute command;
end loop;
end if;
raise exception 'Failed to recreate dependent view';
end;
end if;
command := 'alter table ' || lower(tablename) || ' alter column ' || lower(columnname) || ' type ' || lower(datatype);
execute command;
i := array_upper(dropviews, 1);
if i > 0 then
for j in 1 .. i loop
command := 'create or replace view ' || dropviews[j] || ' as ' || viewtext[j];
execute command;
end loop;
end if;
end if;
end if;
if defaultclause is not null then
if lower(defaultclause) = 'null' then
command := 'alter table ' || lower(tablename) || ' alter column ' || lower(columnname) || ' drop default ';
else
command := 'alter table ' || lower(tablename) || ' alter column ' || lower(columnname) || ' set default ''' || defaultclause || '''';
end if;
execute command;
end if;
if nullclause is not null then
if lower(nullclause) = 'not null' then
command := 'alter table ' || lower(tablename) || ' alter column ' || lower(columnname) || ' set not null';
execute command;
elsif lower(nullclause) = 'null' then
command := 'alter table ' || lower(tablename) || ' alter column ' || lower(columnname) || ' drop not null';
execute command;
end if;
end if;
end;
$$ language plpgsql;
create table t_alter_column
( tablename name, columnname name, datatype name, nullclause varchar(10), defaultclause varchar(200));
create rule alter_column_rule as on insert to t_alter_column
do instead select altercolumn(new.tablename, new.columnname, new.datatype, new.nullclause,
new.defaultclause);