Changeset: 7bb88771f17c for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=7bb88771f17c
Modified Files:
dump.sql
Branch: monetdbe-proxy
Log Message:
Use an explicit sequence to implement auto-incrementation in dump_statements
table.
diffs (48 lines):
diff --git a/dump.sql b/dump.sql
--- a/dump.sql
+++ b/dump.sql
@@ -1,5 +1,8 @@
START TRANSACTION;
+--We start with creating static versions of catalogue tables that are going to
be affected by this dump script itself.
+CREATE TEMPORARY TABLE _user_sequences AS SELECT * FROM sys.sequences;
+
CREATE FUNCTION SQ (s STRING) RETURNS STRING BEGIN RETURN ' ''' || s || ''' ';
END;
CREATE FUNCTION DQ (s STRING) RETURNS STRING BEGIN RETURN '"' || s || '"';
END; --TODO: Figure out why this breaks with the space
CREATE FUNCTION FQTN(s STRING, t STRING) RETURNS STRING BEGIN RETURN DQ(s) ||
'.' || DQ(t); END;
@@ -332,7 +335,7 @@ BEGIN
seq."increment",
seq."cacheinc",
seq."cycle"
- FROM sys.sequences seq, sys.schemas s
+ FROM _user_sequences seq, sys.schemas s
WHERE s.id = seq.schema_id
ORDER BY s.name, seq.name;
END;
@@ -350,11 +353,13 @@ RETURN
FROM describe_sequences();
END;
---We cannot directly use dump_sequences() later because the temporary table
"dump_statements" creates a SEQUENCE due to AUTO_INCREMENT.
---So we first dump the current sequences into a temp table "_dump_sequences"
which will use to create the database_dump.
+--The dump statement should normally have an auto-incremented column
representing the creation order.
+--But in cases of db objects that can be interdependent, i.e. functions and
table-likes, we need access to the underlying sequence of the AUTO_INCREMENT
property.
+--Because we need to explicitly overwrite the creation order column "o" in
those cases and after inserting the dump statements for functions and
table-likes,
+--we can restart the auto-increment sequence with a sensible value for
following dump statements.
-CREATE TEMPORARY TABLE _dump_sequences AS SELECT * FROM dump_sequences();
-CREATE TEMPORARY TABLE dump_statements(o INT AUTO_INCREMENT, s STRING, PRIMARY
KEY (o));
+CREATE SEQUENCE _auto_increment;
+CREATE TEMPORARY TABLE dump_statements(o INT DEFAULT NEXT VALUE FOR
_auto_increment, s STRING, PRIMARY KEY (o));
CREATE PROCEDURE dump_database(describe BOOLEAN)
BEGIN
@@ -404,7 +409,7 @@ BEGIN
FROM sys.auths a1, sys.auths a2, sys.user_role ur
WHERE a1.id = ur.login_id AND a2.id = ur.role_id;
- INSERT INTO dump_statements(s) SELECT * FROM _dump_sequences;
+ INSERT INTO dump_statements(s) SELECT * FROM dump_sequences();
INSERT INTO dump_statements(s) --dump_create_comments_on_sequences
SELECT comment_on('SEQUENCE', DQ(sch.name) || '.' || DQ(seq.name),
rem.remark)
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