mirror of
https://github.com/MariaDB/server.git
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17a87d6063
Working features:
CREATE OR REPLACE [TEMPORARY] SEQUENCE [IF NOT EXISTS] name
[ INCREMENT [ BY | = ] increment ]
[ MINVALUE [=] minvalue | NO MINVALUE ]
[ MAXVALUE [=] maxvalue | NO MAXVALUE ]
[ START [ WITH | = ] start ] [ CACHE [=] cache ] [ [ NO ] CYCLE ]
ENGINE=xxx COMMENT=".."
SELECT NEXT VALUE FOR sequence_name;
SELECT NEXTVAL(sequence_name);
SELECT PREVIOUS VALUE FOR sequence_name;
SELECT LASTVAL(sequence_name);
SHOW CREATE SEQUENCE sequence_name;
SHOW CREATE TABLE sequence_name;
CREATE TABLE sequence-structure ... SEQUENCE=1
ALTER TABLE sequence RENAME TO sequence2;
RENAME TABLE sequence TO sequence2;
DROP [TEMPORARY] SEQUENCE [IF EXISTS] sequence_names
Missing features
- SETVAL(value,sequence_name), to be used with replication.
- Check replication, including checking that sequence tables are marked
not transactional.
- Check that a commit happens for NEXT VALUE that changes table data (may
already work)
- ALTER SEQUENCE. ANSI SQL version of setval.
- Share identical sequence entries to not add things twice to table list.
- testing insert/delete/update/truncate/load data
- Run and fix Alibaba sequence tests (part of mysql-test/suite/sql_sequence)
- Write documentation for NEXT VALUE / PREVIOUS_VALUE
- NEXTVAL in DEFAULT
- Ensure that NEXTVAL in DEFAULT uses database from base table
- Two NEXTVAL for same row should give same answer.
- Oracle syntax sequence_table.nextval, without any FOR or FROM.
- Sequence tables are treated as 'not read constant tables' by SELECT; Would
be better if we would have a separate list for sequence tables so that
select doesn't know about them, except if refereed to with FROM.
Other things done:
- Improved output for safemalloc backtrack
- frm_type_enum changed to Table_type
- Removed lex->is_view and replaced with lex->table_type. This allows
use to more easy check if item is view, sequence or table.
- Added table flag HA_CAN_TABLES_WITHOUT_ROLLBACK, needed for handlers
that want's to support sequences
- Added handler calls:
- engine_name(), to simplify getting engine name for partition and sequences
- update_first_row(), to be able to do efficient sequence implementations.
- Made binlog_log_row() global to be able to call it from ha_sequence.cc
- Added handler variable: row_already_logged, to be able to flag that the
changed row is already logging to replication log.
- Added CF_DB_CHANGE and CF_SCHEMA_CHANGE flags to simplify
deny_updates_if_read_only_option()
- Added sp_add_cfetch() to avoid new conflicts in sql_yacc.yy
- Moved code for add_table_options() out from sql_show.cc::show_create_table()
- Added String::append_longlong() and used it in sql_show.cc to simplify code.
- Added extra option to dd_frm_type() and ha_table_exists to indicate if
the table is a sequence. Needed by DROP SQUENCE to not drop a table.
61 lines
1.7 KiB
Plaintext
61 lines
1.7 KiB
Plaintext
SET sql_mode=ORACLE;
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CREATE SEQUENCE s1;
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SHOW CREATE SEQUENCE s1;
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Table Create Table
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s1 CREATE SEQUENCE "s1" start with 1 minvalue 1 maxvalue 9223372036854775806 increment by 1 cache 1000 nocycle
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SELECT s1.currval;
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s1.currval
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NULL
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SELECT s1.nextval;
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s1.nextval
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1
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SELECT s1.nextval;
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s1.nextval
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2
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SELECT s1.nextval;
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s1.nextval
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3
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EXPLAIN EXTENDED SELECT s1.nextval;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select nextval("test"."s1") AS "s1.nextval"
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SELECT nextval(s1);
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nextval(s1)
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4
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EXPLAIN EXTENDED SELECT s1.currval;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select lastval("test"."s1") AS "s1.currval"
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SELECT lastval(s1);
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lastval(s1)
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4
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DROP SEQUENCE s1;
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CREATE SEQUENCE s1;
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CREATE VIEW v1 AS SELECT s1.nextval AS a;
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SELECT VIEW_DEFINITION FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME='v1';
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VIEW_DEFINITION
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select nextval(`test`.`s1`) AS `a`
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SELECT * FROM v1;
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a
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1
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SHOW CREATE VIEW v1;
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View Create View character_set_client collation_connection
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v1 CREATE VIEW "v1" AS select nextval("test"."s1") AS "a" latin1 latin1_swedish_ci
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DROP VIEW v1;
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DROP SEQUENCE s1;
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CREATE SEQUENCE s1;
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CREATE VIEW v1 AS SELECT s1.currval AS a;
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SELECT VIEW_DEFINITION FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME='v1';
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VIEW_DEFINITION
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select lastval(`test`.`s1`) AS `a`
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SELECT * FROM v1;
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a
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NULL
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SHOW CREATE VIEW v1;
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View Create View character_set_client collation_connection
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v1 CREATE VIEW "v1" AS select lastval("test"."s1") AS "a" latin1 latin1_swedish_ci
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DROP VIEW v1;
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DROP SEQUENCE s1;
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