我遇到了我的主键序列与我的表行不同步的问题。
也就是说,当我插入新行时,我得到一个重复的键错误,因为串行数据类型中隐含的序列返回了一个已经存在的数字。
这似乎是由于导入/还原未正确维护序列引起的。
我遇到了我的主键序列与我的表行不同步的问题。
也就是说,当我插入新行时,我得到一个重复的键错误,因为串行数据类型中隐含的序列返回了一个已经存在的数字。
这似乎是由于导入/还原未正确维护序列引起的。
Answers:
-- Login to psql and run the following
-- What is the result?
SELECT MAX(id) FROM your_table;
-- Then run...
-- This should be higher than the last result.
SELECT nextval('your_table_id_seq');
-- If it's not higher... run this set the sequence last to your highest id.
-- (wise to run a quick pg_dump first...)
BEGIN;
-- protect against concurrent inserts while you update the counter
LOCK TABLE your_table IN EXCLUSIVE MODE;
-- Update the sequence
SELECT setval('your_table_id_seq', COALESCE((SELECT MAX(id)+1 FROM your_table), 1), false);
COMMIT;
SELECT setval('your_table_id_seq', coalesce((select max(id)+1 from your_table), 1), false);
SELECT setval('your_seq',(SELECT GREATEST(MAX(your_id)+1,nextval('your_seq'))-1 FROM your_table))
pg_get_serial_sequence
可用于避免对序列名称的任何错误假设。这会在一连拍中重置序列:
SELECT pg_catalog.setval(pg_get_serial_sequence('table_name', 'id'), (SELECT MAX(id) FROM table_name)+1);
或更简而言之:
SELECT pg_catalog.setval(pg_get_serial_sequence('table_name', 'id'), MAX(id)) FROM table_name;
但是,这种形式不能正确处理空表,因为max(id)为null,也不能设置setval 0,因为它将超出序列范围。一种解决方法是诉诸ALTER SEQUENCE
语法,即
ALTER SEQUENCE table_name_id_seq RESTART WITH 1;
ALTER SEQUENCE table_name_id_seq RESTART; -- 8.4 or higher
但是ALTER SEQUENCE
用途有限,因为序列名称和重新启动值不能为表达式。
似乎最好的通用解决方案是setval
使用false作为第三个参数进行调用,从而允许我们指定“要使用的下一个值”:
SELECT setval(pg_get_serial_sequence('t1', 'id'), coalesce(max(id),0) + 1, false) FROM t1;
这打勾了我所有的框:
最后,请注意,pg_get_serial_sequence
仅当序列归列所有时才有效。如果将递增列定义为serial
类型,则会是这种情况,但是,如果手动添加了序列,则必须确保ALTER SEQUENCE .. OWNED BY
也要执行。
即如果serial
类型用于表创建,那么这应该全部起作用:
CREATE TABLE t1 (
id serial,
name varchar(20)
);
SELECT pg_get_serial_sequence('t1', 'id'); -- returns 't1_id_seq'
-- reset the sequence, regardless whether table has rows or not:
SELECT setval(pg_get_serial_sequence('t1', 'id'), coalesce(max(id),0) + 1, false) FROM t1;
但是,如果手动添加了序列:
CREATE TABLE t2 (
id integer NOT NULL,
name varchar(20)
);
CREATE SEQUENCE t2_custom_id_seq
START WITH 1
INCREMENT BY 1
NO MINVALUE
NO MAXVALUE
CACHE 1;
ALTER TABLE t2 ALTER COLUMN id SET DEFAULT nextval('t2_custom_id_seq'::regclass);
ALTER SEQUENCE t2_custom_id_seq OWNED BY t2.id; -- required for pg_get_serial_sequence
SELECT pg_get_serial_sequence('t2', 'id'); -- returns 't2_custom_id_seq'
-- reset the sequence, regardless whether table has rows or not:
SELECT setval(pg_get_serial_sequence('t2', 'id'), coalesce(max(id),0) + 1, false) FROM t1;
setval()
设置当前值,并且nextval()
已经返回了当前值+1。
在最短,最快的方法:
SELECT setval('tbl_tbl_id_seq', max(tbl_id)) FROM tbl;
tbl_id
是serial
table 的列tbl
,是从序列中绘制的tbl_tbl_id_seq
(这是默认的自动名称)。
如果您不知道附加序列的名称(不一定是默认格式),请使用pg_get_serial_sequence()
:
SELECT setval(pg_get_serial_sequence('tbl', 'tbl_id'), max(tbl_id)) FROM tbl;
这里没有一一对应的错误。每个文档:
两参数形式将序列的
last_value
字段设置为指定的值,并将其is_called
字段设置为true,这意味着 下一个nextval
将在返回值之前使序列前进。
大胆强调我的。
如果表可以为空,并且在这种情况下实际上从1开始:
SELECT setval(pg_get_serial_sequence('tbl', 'tbl_id')
, COALESCE(max(tbl_id) + 1, 1)
, false)
FROM tbl;
我们不能仅使用2-paremater形式并以此作为开始,0
因为默认情况下序列的下限是1(除非自定义)。
尚无防范并发序列活动或上述查询中写入表的措施。如果相关,您可以将表锁定为独占模式。当您尝试同步时,它可以防止并发事务写入更多的数字。(它还会临时阻止无害的写入,而不会干扰最大数量。)
但是,这并没有考虑到客户端可能已经预先获取了序列号而没有在主表上进行任何锁定的情况(这可能会发生)。为此,也只增加序列的当前值,而不要减小它。看起来可能有些偏执,但这与序列的性质以及防止并发问题相符。
BEGIN;
LOCK TABLE tbl IN EXCLUSIVE MODE;
SELECT setval('tbl_tbl_id_seq', max(tbl_id))
FROM tbl
HAVING max(tbl_id) > (SELECT last_value FROM tbl_tbl_id_seq);
COMMIT;
EXECUTE format()
(如@EB。)是基本功能!如何解决PostgreSQL中缺少标准库的问题????
这将使公开的所有序列复位,而无需假设表或列的名称。在版本8.4上测试
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text, columnname text, sequence_name text) RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( ''' || sequence_name || ''', ' || '(SELECT MAX(' || columnname || ') FROM ' || tablename || ')' || '+1)';
END;
$body$ LANGUAGE 'plpgsql';
select table_name || '_' || column_name || '_seq', reset_sequence(table_name, column_name, table_name || '_' || column_name || '_seq') from information_schema.columns where column_default like 'nextval%';
substring(column_default, '''(.*)''')
代替table_name || '_' || column_name || '_seq'
。完美运作。
quote_literal
和quote_ident
功能,最好的format
功能,应该真正用在这里。
substring(column_default from 'nextval\(''(.+)''::regclass\)')
明确地获取序列名称。像魅力一样工作。
substring(column_default, '''(.*)''') instead of table_name || '_' || column_name || '_seq'
ALTER SEQUENCE sequence_name重新启动(从table_name选择SELECT max(id));
不起作用
复制自@tardate答案:
SELECT setval(pg_get_serial_sequence('table_name', 'id'), MAX(id)) FROM table_name;
该命令仅用于更改PostgreSQL中自动生成的键序列值
ALTER SEQUENCE "your_sequence_name" RESTART WITH 0;
代替零,您可以输入要从其重新启动序列的任何数字。
默认序列名称为"TableName_FieldName_seq"
。例如,如果表名是"MyTable"
,字段名是"MyID"
,那么序列名将是"MyTable_MyID_seq"
。
这个答案与@murugesanponappan的答案相同,但是他的解决方案中存在语法错误。您不能(select max()...)
在alter
命令中使用子查询。因此,您要么必须使用固定的数值,要么需要使用变量来代替子查询。
重置所有序列,除了每个表的主键均为“ id”外,无需假名:
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text, columnname text)
RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( pg_get_serial_sequence(''' || tablename || ''', ''' || columnname || '''),
(SELECT COALESCE(MAX(id)+1,1) FROM ' || tablename || '), false)';
END;
$body$ LANGUAGE 'plpgsql';
select table_name || '_' || column_name || '_seq', reset_sequence(table_name, column_name) from information_schema.columns where column_default like 'nextval%';
pg_get_serial_sequence(''"' || tablename || '"''
EXECUTE format( 'SELECT setval(pg_get_serial_sequence(%L, %L), coalesce(max(id),0) + 1, false) FROM %I;', $1,$2,$1 );
当序列名称,列名称,表名称或模式名称具有有趣的字符(例如空格,标点符号等)时,这些功能将充满风险。我写了这个:
CREATE OR REPLACE FUNCTION sequence_max_value(oid) RETURNS bigint
VOLATILE STRICT LANGUAGE plpgsql AS $$
DECLARE
tabrelid oid;
colname name;
r record;
newmax bigint;
BEGIN
FOR tabrelid, colname IN SELECT attrelid, attname
FROM pg_attribute
WHERE (attrelid, attnum) IN (
SELECT adrelid::regclass,adnum
FROM pg_attrdef
WHERE oid IN (SELECT objid
FROM pg_depend
WHERE refobjid = $1
AND classid = 'pg_attrdef'::regclass
)
) LOOP
FOR r IN EXECUTE 'SELECT max(' || quote_ident(colname) || ') FROM ' || tabrelid::regclass LOOP
IF newmax IS NULL OR r.max > newmax THEN
newmax := r.max;
END IF;
END LOOP;
END LOOP;
RETURN newmax;
END; $$ ;
您可以通过传递OID来为单个序列调用它,它将返回具有默认序列的任何表使用的最高编号;或者您可以使用类似这样的查询来运行它,以重置数据库中的所有序列:
select relname, setval(oid, sequence_max_value(oid))
from pg_class
where relkind = 'S';
使用不同的质量,您只能重置特定模式中的序列,依此类推。例如,如果要调整“公共”模式中的序列:
select relname, setval(pg_class.oid, sequence_max_value(pg_class.oid))
from pg_class, pg_namespace
where pg_class.relnamespace = pg_namespace.oid and
nspname = 'public' and
relkind = 'S';
请注意,由于setval()的工作原理,您无需在结果中加1。
作为结束语,我必须警告某些数据库似乎具有默认值,这些默认值以不让系统目录包含其完整信息的方式链接到序列。当您在psql的\ d中看到类似这样的情况时,就会发生这种情况:
alvherre=# \d baz
Tabla «public.baz»
Columna | Tipo | Modificadores
---------+---------+------------------------------------------------
a | integer | default nextval(('foo_a_seq'::text)::regclass)
请注意,除了:: regclass强制转换之外,该默认子句中的nextval()调用还具有:: text强制转换。我认为这是由于数据库已从旧PostgreSQL版本中进行pg_dump。将会发生的是,上面的函数sequence_max_value()将忽略该表。要解决此问题,您可以重新定义DEFAULT子句以直接引用序列而无需强制转换:
alvherre=# alter table baz alter a set default nextval('foo_a_seq');
ALTER TABLE
然后psql正确显示它:
alvherre=# \d baz
Tabla «public.baz»
Columna | Tipo | Modificadores
---------+---------+----------------------------------------
a | integer | default nextval('foo_a_seq'::regclass)
解决此问题后,此函数将针对该表以及所有其他可能使用相同序列的函数正确运行。
newmax := r.max::bigint;
以使其对我来说正常工作。
'SELECT max(' || quote_ident(colname) || ') FROM '
=> 'SELECT max(' || quote_ident(colname) || '::bigint) FROM '
注意::bigint
动态构建查询中添加的强制转换。
另一个plpgsql-仅在以下情况下重置 max(att) > then lastval
do --check seq not in sync
$$
declare
_r record;
_i bigint;
_m bigint;
begin
for _r in (
SELECT relname,nspname,d.refobjid::regclass, a.attname, refobjid
FROM pg_depend d
JOIN pg_attribute a ON a.attrelid = d.refobjid AND a.attnum = d.refobjsubid
JOIN pg_class r on r.oid = objid
JOIN pg_namespace n on n.oid = relnamespace
WHERE d.refobjsubid > 0 and relkind = 'S'
) loop
execute format('select last_value from %I.%I',_r.nspname,_r.relname) into _i;
execute format('select max(%I) from %s',_r.attname,_r.refobjid) into _m;
if coalesce(_m,0) > _i then
raise info '%',concat('changed: ',_r.nspname,'.',_r.relname,' from:',_i,' to:',_m);
execute format('alter sequence %I.%I restart with %s',_r.nspname,_r.relname,_m+1);
end if;
end loop;
end;
$$
;
也注释该行将--execute format('alter sequence
给出列表,而不是实际重置值
重设所有公开序列
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text) RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( '''
|| tablename
|| '_id_seq'', '
|| '(SELECT id + 1 FROM "'
|| tablename
|| '" ORDER BY id DESC LIMIT 1), false)';
END;
$body$ LANGUAGE 'plpgsql';
select sequence_name, reset_sequence(split_part(sequence_name, '_id_seq',1)) from information_schema.sequences
where sequence_schema='public';
我建议在postgres Wiki上找到此解决方案。它更新表的所有序列。
SELECT 'SELECT SETVAL(' ||
quote_literal(quote_ident(PGT.schemaname) || '.' || quote_ident(S.relname)) ||
', COALESCE(MAX(' ||quote_ident(C.attname)|| '), 1) ) FROM ' ||
quote_ident(PGT.schemaname)|| '.'||quote_ident(T.relname)|| ';'
FROM pg_class AS S,
pg_depend AS D,
pg_class AS T,
pg_attribute AS C,
pg_tables AS PGT
WHERE S.relkind = 'S'
AND S.oid = D.objid
AND D.refobjid = T.oid
AND D.refobjid = C.attrelid
AND D.refobjsubid = C.attnum
AND T.relname = PGT.tablename
ORDER BY S.relname;
使用方法(来自postgres Wiki):
例:
psql -Atq -f reset.sql -o temp
psql -f temp
rm temp
原始文章(也有序列所有权的修复)在这里
这里有一些非常棘手的答案,我假设它在被问到的时候曾经是很糟糕的,因为这里的很多答案都不适用于9.3版。从8.0版开始的文档就提供了以下问题的答案:
SELECT setval('serial', max(id)) FROM distributors;
另外,如果您需要注意区分大小写的序列名称,可以采用以下方法:
SELECT setval('"Serial"', max(id)) FROM distributors;
使用实体框架创建数据库,然后使用初始数据为数据库添加种子时,会发生此问题,这会使序列不匹配。
我通过创建在种子数据库后运行的脚本来解决该问题:
DO
$do$
DECLARE tablename text;
BEGIN
-- change the where statments to include or exclude whatever tables you need
FOR tablename IN SELECT table_name FROM information_schema.tables WHERE table_schema='public' AND table_type='BASE TABLE' AND table_name != '__EFMigrationsHistory'
LOOP
EXECUTE format('SELECT setval(pg_get_serial_sequence(''"%s"'', ''Id''), (SELECT MAX("Id") + 1 from "%s"))', tablename, tablename);
END LOOP;
END
$do$
MAX("Id") + 1
当序列= =最大值时,它对我最有效。
我的版本使用第一个,并进行一些错误检查...
BEGIN;
CREATE OR REPLACE FUNCTION reset_sequence(_table_schema text, _tablename text, _columnname text, _sequence_name text)
RETURNS pg_catalog.void AS
$BODY$
DECLARE
BEGIN
PERFORM 1
FROM information_schema.sequences
WHERE
sequence_schema = _table_schema AND
sequence_name = _sequence_name;
IF FOUND THEN
EXECUTE 'SELECT setval( ''' || _table_schema || '.' || _sequence_name || ''', ' || '(SELECT MAX(' || _columnname || ') FROM ' || _table_schema || '.' || _tablename || ')' || '+1)';
ELSE
RAISE WARNING 'SEQUENCE NOT UPDATED ON %.%', _tablename, _columnname;
END IF;
END;
$BODY$
LANGUAGE 'plpgsql';
SELECT reset_sequence(table_schema, table_name, column_name, table_name || '_' || column_name || '_seq')
FROM information_schema.columns
WHERE column_default LIKE 'nextval%';
DROP FUNCTION reset_sequence(_table_schema text, _tablename text, _columnname text, _sequence_name text) ;
COMMIT;
RAISE WARNING
为我确定的。
放在一起
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text)
RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( pg_get_serial_sequence(''' || tablename || ''', ''id''),
(SELECT COALESCE(MAX(id)+1,1) FROM ' || tablename || '), false)';
END;
$body$ LANGUAGE 'plpgsql';
将修复id'
给定表的顺序(例如,通常对于django是必需的)。
在我还没有尝试过代码之前:在下面的代码中,我发布了适用于我的PC [Postgres 8.3]的Klaus和user457226解决方案的sql代码版本,对Klaus版本和我的版本进行了一些调整为用户457226之一。
克劳斯解决方案:
drop function IF EXISTS rebuilt_sequences() RESTRICT;
CREATE OR REPLACE FUNCTION rebuilt_sequences() RETURNS integer as
$body$
DECLARE sequencedefs RECORD; c integer ;
BEGIN
FOR sequencedefs IN Select
constraint_column_usage.table_name as tablename,
constraint_column_usage.table_name as tablename,
constraint_column_usage.column_name as columnname,
replace(replace(columns.column_default,'''::regclass)',''),'nextval(''','') as sequencename
from information_schema.constraint_column_usage, information_schema.columns
where constraint_column_usage.table_schema ='public' AND
columns.table_schema = 'public' AND columns.table_name=constraint_column_usage.table_name
AND constraint_column_usage.column_name = columns.column_name
AND columns.column_default is not null
LOOP
EXECUTE 'select max('||sequencedefs.columnname||') from ' || sequencedefs.tablename INTO c;
IF c is null THEN c = 0; END IF;
IF c is not null THEN c = c+ 1; END IF;
EXECUTE 'alter sequence ' || sequencedefs.sequencename ||' restart with ' || c;
END LOOP;
RETURN 1; END;
$body$ LANGUAGE plpgsql;
select rebuilt_sequences();
user457226解决方案:
--drop function IF EXISTS reset_sequence (text,text) RESTRICT;
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text,columnname text) RETURNS bigint --"pg_catalog"."void"
AS
$body$
DECLARE seqname character varying;
c integer;
BEGIN
select tablename || '_' || columnname || '_seq' into seqname;
EXECUTE 'SELECT max("' || columnname || '") FROM "' || tablename || '"' into c;
if c is null then c = 0; end if;
c = c+1; --because of substitution of setval with "alter sequence"
--EXECUTE 'SELECT setval( "' || seqname || '", ' || cast(c as character varying) || ', false)'; DOES NOT WORK!!!
EXECUTE 'alter sequence ' || seqname ||' restart with ' || cast(c as character varying);
RETURN nextval(seqname)-1;
END;
$body$ LANGUAGE 'plpgsql';
select sequence_name, PG_CLASS.relname, PG_ATTRIBUTE.attname,
reset_sequence(PG_CLASS.relname,PG_ATTRIBUTE.attname)
from PG_CLASS
join PG_ATTRIBUTE on PG_ATTRIBUTE.attrelid = PG_CLASS.oid
join information_schema.sequences
on information_schema.sequences.sequence_name = PG_CLASS.relname || '_' || PG_ATTRIBUTE.attname || '_seq'
where sequence_schema='public';
重新检查公共模式功能中的所有序列
CREATE OR REPLACE FUNCTION public.recheck_sequence (
)
RETURNS void AS
$body$
DECLARE
_table_name VARCHAR;
_column_name VARCHAR;
_sequence_name VARCHAR;
BEGIN
FOR _table_name IN SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname = 'public' LOOP
FOR _column_name IN SELECT column_name FROM information_schema.columns WHERE table_name = _table_name LOOP
SELECT pg_get_serial_sequence(_table_name, _column_name) INTO _sequence_name;
IF _sequence_name IS NOT NULL THEN
EXECUTE 'SELECT setval('''||_sequence_name||''', COALESCE((SELECT MAX('||quote_ident(_column_name)||')+1 FROM '||quote_ident(_table_name)||'), 1), FALSE);';
END IF;
END LOOP;
END LOOP;
END;
$body$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;
要将所有序列重新启动为1,请使用:
-- Create Function
CREATE OR REPLACE FUNCTION "sy_restart_seq_to_1" (
relname TEXT
)
RETURNS "pg_catalog"."void" AS
$BODY$
DECLARE
BEGIN
EXECUTE 'ALTER SEQUENCE '||relname||' RESTART WITH 1;';
END;
$BODY$
LANGUAGE 'plpgsql';
-- Use Function
SELECT
relname
,sy_restart_seq_to_1(relname)
FROM pg_class
WHERE relkind = 'S';
克劳斯(Klaus)的答案是最有用的,可能会引起一些误解:您必须在select语句中添加DISTINCT。
但是,如果您确定没有两个表的表名+列名可以相等,则也可以使用:
select sequence_name, --PG_CLASS.relname, PG_ATTRIBUTE.attname
reset_sequence(split_part(sequence_name, '_id_seq',1))
from PG_CLASS
join PG_ATTRIBUTE on PG_ATTRIBUTE.attrelid = PG_CLASS.oid
join information_schema.sequences
on information_schema.sequences.sequence_name = PG_CLASS.relname || '_' || PG_ATTRIBUTE.attname
where sequence_schema='public';
当某些感兴趣的列名不是“ ID”时,这是user457226解决方案的扩展。
这个答案是毛罗的副本。
drop function IF EXISTS rebuilt_sequences() RESTRICT;
CREATE OR REPLACE FUNCTION rebuilt_sequences() RETURNS integer as
$body$
DECLARE sequencedefs RECORD; c integer ;
BEGIN
FOR sequencedefs IN Select
DISTINCT(constraint_column_usage.table_name) as tablename,
constraint_column_usage.column_name as columnname,
replace(replace(columns.column_default,'''::regclass)',''),'nextval(''','') as sequencename
from information_schema.constraint_column_usage, information_schema.columns
where constraint_column_usage.table_schema ='public' AND
columns.table_schema = 'public' AND columns.table_name=constraint_column_usage.table_name
AND constraint_column_usage.column_name = columns.column_name
AND columns.column_default is not null
ORDER BY sequencename
LOOP
EXECUTE 'select max('||sequencedefs.columnname||') from ' || sequencedefs.tablename INTO c;
IF c is null THEN c = 0; END IF;
IF c is not null THEN c = c+ 1; END IF;
EXECUTE 'alter sequence ' || sequencedefs.sequencename ||' minvalue '||c ||' start ' || c ||' restart with ' || c;
END LOOP;
RETURN 1; END;
$body$ LANGUAGE plpgsql;
select rebuilt_sequences();
我花了一个小时来尝试获得djsnowsill的答案,以便使用混合大小写表和列来处理数据库,然后由于Manuel Darveau的评论,最终偶然发现了该解决方案,但是我想我可以让每个人都更加清楚:
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text, columnname text)
RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE format('SELECT setval(pg_get_serial_sequence(''%1$I'', %2$L),
(SELECT COALESCE(MAX(%2$I)+1,1) FROM %1$I), false)',tablename,columnname);
END;
$body$ LANGUAGE 'plpgsql';
SELECT format('%s_%s_seq',table_name,column_name), reset_sequence(table_name,column_name)
FROM information_schema.columns WHERE column_default like 'nextval%';
这样做的好处是:
解释一下,问题在于pg_get_serial_sequence
需要字符串来计算出您所指的内容,因此,如果这样做:
"TableName" --it thinks it's a table or column
'TableName' --it thinks it's a string, but makes it lower case
'"TableName"' --it works!
这是通过使用''%1$I''
格式字符串来实现的,用''
撇号1$
表示第一个arg,并I
用引号表示
select 'SELECT SETVAL(' || seq [ 1] || ', COALESCE(MAX('||column_name||')+1, 1) ) FROM '||table_name||';'
from (
SELECT table_name, column_name, column_default, regexp_match(column_default, '''.*''') as seq
from information_schema.columns
where column_default ilike 'nextval%'
) as sequense_query
尝试重新索引。
更新:正如评论中指出的,这是对原始问题的答复。
SELECT setval...
使JDBC变得愚蠢,因此这是一种与Java兼容的方式:
-- work around JDBC 'A result was returned when none was expected.'
-- fix broken nextval due to poorly written 20140320100000_CreateAdminUserRoleTables.sql
DO 'BEGIN PERFORM setval(pg_get_serial_sequence(''admin_user_role_groups'', ''id''), 1 + COALESCE(MAX(id), 0), FALSE) FROM admin_user_role_groups; END;';
一种更新模式中用作ID的所有序列的方法:
DO $$ DECLARE
r RECORD;
BEGIN
FOR r IN (SELECT tablename, pg_get_serial_sequence(tablename, 'id') as sequencename
FROM pg_catalog.pg_tables
WHERE schemaname='YOUR_SCHEMA'
AND tablename IN (SELECT table_name
FROM information_schema.columns
WHERE table_name=tablename and column_name='id')
order by tablename)
LOOP
EXECUTE
'SELECT setval(''' || r.sequencename || ''', COALESCE(MAX(id), 1), MAX(id) IS NOT null)
FROM ' || r.tablename || ';';
END LOOP;
END $$;
这里有很多很好的答案。重新加载Django数据库后,我也有同样的需求。
但是我需要:
这似乎与原始要求非常相似。
感谢Baldiry和Mauro使我走上了正确的道路。
drop function IF EXISTS reset_sequences(text[], text) RESTRICT;
CREATE OR REPLACE FUNCTION reset_sequences(
in_schema_name_list text[] = '{"django", "dbaas", "metrics", "monitor", "runner", "db_counts"}',
in_table_name text = '%') RETURNS text[] as
$body$
DECLARE changed_seqs text[];
DECLARE sequence_defs RECORD; c integer ;
BEGIN
FOR sequence_defs IN
select
DISTINCT(ccu.table_name) as table_name,
ccu.column_name as column_name,
replace(replace(c.column_default,'''::regclass)',''),'nextval(''','') as sequence_name
from information_schema.constraint_column_usage ccu,
information_schema.columns c
where ccu.table_schema = ANY(in_schema_name_list)
and ccu.table_schema = c.table_schema
AND c.table_name = ccu.table_name
and c.table_name like in_table_name
AND ccu.column_name = c.column_name
AND c.column_default is not null
ORDER BY sequence_name
LOOP
EXECUTE 'select max(' || sequence_defs.column_name || ') from ' || sequence_defs.table_name INTO c;
IF c is null THEN c = 1; else c = c + 1; END IF;
EXECUTE 'alter sequence ' || sequence_defs.sequence_name || ' restart with ' || c;
changed_seqs = array_append(changed_seqs, 'alter sequence ' || sequence_defs.sequence_name || ' restart with ' || c);
END LOOP;
changed_seqs = array_append(changed_seqs, 'Done');
RETURN changed_seqs;
END
$body$ LANGUAGE plpgsql;
然后执行并查看更改运行:
select *
from unnest(reset_sequences('{"django", "dbaas", "metrics", "monitor", "runner", "db_counts"}'));
退货
activity_id_seq restart at 22
api_connection_info_id_seq restart at 4
api_user_id_seq restart at 1
application_contact_id_seq restart at 20