|
| 1 | +## PostgreSQL Oracle 兼容性之 - ALTER TRIGGER ENABLE|DISABLE |
| 2 | + |
| 3 | +### 作者 |
| 4 | +digoal |
| 5 | + |
| 6 | +### 日期 |
| 7 | +2018-04-08 |
| 8 | + |
| 9 | +### 标签 |
| 10 | +PostgreSQL , 触发器 , enable , disable |
| 11 | + |
| 12 | +---- |
| 13 | + |
| 14 | +## 背景 |
| 15 | +Oracle 临时关闭或启用触发器的语法如下 |
| 16 | + |
| 17 | +https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_4001.htm |
| 18 | + |
| 19 | +``` |
| 20 | +ALTER TRIGGER [ schema. ]trigger |
| 21 | + { ENABLE |
| 22 | + | DISABLE |
| 23 | + | RENAME TO new_name |
| 24 | + | COMPILE [ DEBUG ] |
| 25 | + [ compiler_parameters_clause |
| 26 | + [ compiler_parameters_clause ] ... ] |
| 27 | + [ REUSE SETTINGS ] |
| 28 | + } ; |
| 29 | +``` |
| 30 | + |
| 31 | +## PostgreSQL 触发器开关语法更丰富一些 |
| 32 | +PostgreSQL中对应的语法在alter table中，因为触发器与表相关，这样设计语法也符合逻辑的。 |
| 33 | + |
| 34 | +https://www.postgresql.org/docs/devel/static/sql-altertable.html |
| 35 | + |
| 36 | +``` |
| 37 | +ALTER TABLE [ IF EXISTS ] [ ONLY ] name [ * ] |
| 38 | + action [, ... ] |
| 39 | + |
| 40 | + DISABLE TRIGGER [ trigger_name | ALL | USER ] |
| 41 | + ENABLE TRIGGER [ trigger_name | ALL | USER ] |
| 42 | + |
| 43 | + ENABLE REPLICA TRIGGER trigger_name |
| 44 | + ENABLE ALWAYS TRIGGER trigger_name |
| 45 | +``` |
| 46 | + |
| 47 | +细节（注意触发器被触发还受制于session_replication_role参数与replica|always的配置。） |
| 48 | + |
| 49 | +These forms configure the firing of trigger(s) belonging to the table. A disabled trigger is still known to the system, but is not executed when its triggering event occurs. For a deferred trigger, the enable status is checked when the event occurs, not when the trigger function is actually executed. One can disable or enable a single trigger specified by name, or all triggers on the table, or only user triggers (this option excludes internally generated constraint triggers such as those that are used to implement foreign key constraints or deferrable uniqueness and exclusion constraints). Disabling or enabling internally generated constraint triggers requires superuser privileges; it should be done with caution since of course the integrity of the constraint cannot be guaranteed if the triggers are not executed. |
| 50 | + |
| 51 | +The trigger firing mechanism is also affected by the configuration variable session_replication_role. Simply enabled triggers (the default) will fire when the replication role is “origin” (the default) or “local”. Triggers configured as ENABLE REPLICA will only fire if the session is in “replica” mode, and triggers configured as ENABLE ALWAYS will fire regardless of the current replication role. |
| 52 | + |
| 53 | +The effect of this mechanism is that in the default configuration, triggers do not fire on replicas. This is useful because if a trigger is used on the origin to propagate data between tables, then the replication system will also replicate the propagated data, and the trigger should not fire a second time on the replica, because that would lead to duplication. However, if a trigger is used for another purpose such as creating external alerts, then it might be appropriate to set it to ENABLE ALWAYS so that it is also fired on replicas. |
| 54 | + |
| 55 | +This command acquires a SHARE ROW EXCLUSIVE lock. |
| 56 | + |
| 57 | + |
| 58 | +trigger_name |
| 59 | + |
| 60 | +Name of a single trigger to disable or enable. |
| 61 | + |
| 62 | +ALL |
| 63 | + |
| 64 | +Disable or enable all triggers belonging to the table. (This requires superuser privilege if any of the triggers are internally generated constraint triggers such as those that are used to implement foreign key constraints or deferrable uniqueness and exclusion constraints.) |
| 65 | + |
| 66 | +USER |
| 67 | + |
| 68 | +Disable or enable all triggers belonging to the table except for internally generated constraint triggers such as those that are used to implement foreign key constraints or deferrable uniqueness and exclusion constraints. |
| 69 | + |
| 70 | +(内部用于foreign key, unique, 排他 等约束的触发器除外) |
| 71 | + |
| 72 | +关闭或开启指定或所有表，或者某个用户，某个schema下的所有表的触发器。 |
| 73 | + |
| 74 | +使用函数，参考： |
| 75 | + |
| 76 | +https://stackoverflow.com/questions/3942258/how-do-i-temporarily-disable-triggers-in-postgresql |
| 77 | + |
| 78 | +``` |
| 79 | +For example if you have tables in a particular namespace it could be: |
| 80 | +
|
| 81 | +create or replace function disable_triggers(a boolean, nsp character varying) returns void as |
| 82 | +$$ |
| 83 | +declare |
| 84 | +act character varying; |
| 85 | +r record; |
| 86 | +begin |
| 87 | + if(a is true) then |
| 88 | + act = 'disable'; |
| 89 | + else |
| 90 | + act = 'enable'; |
| 91 | + end if; |
| 92 | +
|
| 93 | + for r in select c.relname from pg_namespace n |
| 94 | + join pg_class c on c.relnamespace = n.oid and c.relhastriggers = true |
| 95 | + where n.nspname = nsp |
| 96 | + loop |
| 97 | + execute format('alter table %I %s trigger all', r.relname, act); |
| 98 | + end loop; |
| 99 | +end; |
| 100 | +$$ |
| 101 | +language plpgsql; |
| 102 | +If you want to disable all triggers with certain trigger function it could be: |
| 103 | +
|
| 104 | +create or replace function disable_trigger_func(a boolean, f character varying) returns void as |
| 105 | +$$ |
| 106 | +declare |
| 107 | +act character varying; |
| 108 | +r record; |
| 109 | +begin |
| 110 | + if(a is true) then |
| 111 | + act = 'disable'; |
| 112 | + else |
| 113 | + act = 'enable'; |
| 114 | + end if; |
| 115 | +
|
| 116 | + for r in select c.relname from pg_proc p |
| 117 | + join pg_trigger t on t.tgfoid = p.oid |
| 118 | + join pg_class c on c.oid = t.tgrelid |
| 119 | + where p.proname = f |
| 120 | + loop |
| 121 | + execute format('alter table %I %s trigger all', r.relname, act); |
| 122 | + end loop; |
| 123 | +end; |
| 124 | +$$ |
| 125 | +language plpgsql; |
| 126 | +
|
| 127 | +also dosent work for me in Postgres 9.1. i use the two function described by bartolo-otrit with some modification. I modified the first function to make it work for me because the namespace or the schema must be present to identify the table correctly. The new code is : |
| 128 | +
|
| 129 | +CREATE OR REPLACE FUNCTION disable_triggers(a boolean, nsp character varying) |
| 130 | + RETURNS void AS |
| 131 | +$BODY$ |
| 132 | +declare |
| 133 | +act character varying; |
| 134 | +r record; |
| 135 | +begin |
| 136 | + if(a is true) then |
| 137 | + act = 'disable'; |
| 138 | + else |
| 139 | + act = 'enable'; |
| 140 | + end if; |
| 141 | +
|
| 142 | + for r in select c.relname from pg_namespace n |
| 143 | + join pg_class c on c.relnamespace = n.oid and c.relhastriggers = true |
| 144 | + where n.nspname = nsp |
| 145 | + loop |
| 146 | + execute format('alter table %I.%I %s trigger all', nsp,r.relname, act); |
| 147 | + end loop; |
| 148 | +end; |
| 149 | +$BODY$ |
| 150 | + LANGUAGE plpgsql VOLATILE |
| 151 | + COST 100; |
| 152 | +ALTER FUNCTION disable_triggers(boolean, character varying) |
| 153 | + OWNER TO postgres; |
| 154 | +then i simply do a select query for every schema : |
| 155 | +
|
| 156 | +SELECT disable_triggers(true,'public'); |
| 157 | +SELECT disable_triggers(true,'Adempiere'); |
| 158 | +``` |
| 159 | + |
| 160 | +## 参考 |
| 161 | + |
| 162 | +https://www.postgresql.org/docs/devel/static/sql-altertable.html |
| 163 | + |
| 164 | +https://www.postgresql.org/docs/devel/static/runtime-config-client.html#GUC-SESSION-REPLICATION-ROLE |
| 165 | + |
| 166 | +https://stackoverflow.com/questions/3942258/how-do-i-temporarily-disable-triggers-in-postgresql |
| 167 | + |
| 168 | +[《PostgreSQL rotate table 自动清理调度 - 约束，触发器》](../201803/20180311_06.md) |
| 169 | + |
| 170 | +[《PostgreSQL 事件触发器应用 - DDL审计记录 + 异步通知(notify)》](../201709/20170925_02.md) |
| 171 | + |
| 172 | +[《数据入库实时转换 - trigger , rule》](../201706/20170619_02.md) |
| 173 | + |
| 174 | +[《(流式、lambda、触发器)实时处理大比拼 - 物联网(IoT)\金融,时序处理最佳实践》](../201705/20170518_01.md) |
| 175 | + |
| 176 | +[《快速入门PostgreSQL应用开发与管理 - 7 函数、存储过程和触发器》](../201704/20170412_02.md) |
| 177 | + |
| 178 | +[《PostgreSQL 10.0 preview 功能增强 - 触发器函数内置中间表》](../201704/20170401_01.md) |
| 179 | + |
| 180 | +[《PostgreSQL 安全陷阱 - 利用触发器或规则，结合security invoker函数制造反噬陷阱》](../201509/20150929_01.md) |
| 181 | + |
| 182 | +[《use PostgreSQL trigger manage stock & offer infomation》](../201507/20150717_03.md) |
| 183 | + |
| 184 | +[《PostgreSQL trigger/rule based replication configure, DISABLE/ENABLE [ REPLICA | ALWAYS ] TRIGGER | RULE》](../201506/20150615_01.md) |
| 185 | + |
| 186 | +[《PostgreSQL Oracle 兼容性之 - 事件触发器实现类似Oracle的回收站功能》](../201504/20150429_01.md) |
| 187 | + |
| 188 | +[《PostgreSQL 触发器应用 - use trigger audit record which column modified, insert, delete.》](../201412/20141214_01.md) |
| 189 | + |
| 190 | +[《use event trigger function record user who alter table's SQL》](../201412/20141211_02.md) |
| 191 | + |
| 192 | +[《PostgreSQL 事件触发器 - DDL审计 , DDL逻辑复制 , 打造DDL统一管理入》](../201412/20141211_01.md) |
| 193 | + |
| 194 | +[《PostgreSQL 触发器应用 - (触发器WHEN)前置条件过滤跟踪目标记录》](../201409/20140917_01.md) |
| 195 | + |
| 196 | +[《PostgreSQL 闪回 - flash back query emulate by trigger》](../201408/20140828_01.md) |
| 197 | + |
| 198 | +[《PostgreSQL 事件触发器 - PostgreSQL 9.3 Event Trigger》](../201303/20130313_01.md) |
| 199 | + |
| 200 | +[《表级复制(base on trigger) -- PostgreSQL general sync and async multi-master replication trigger function》](../201303/20130311_03.md) |
| 201 | + |
| 202 | +[《PostgreSQL 触发器 用法详解 2》](../201303/20130311_02.md) |
| 203 | + |
| 204 | +[《PostgreSQL 触发器 用法详解 1》](../201303/20130311_01.md) |
| 205 | + |
| 206 | +[《递归优化CASE - performance tuning case :use cursor\trigger\recursive replace (group by and order by) REDUCE needed blockes scan》](../201209/20120914_01.md) |
| 207 | + |
| 208 | +[《PostgreSQL general public partition table trigger》](../201209/20120907_01.md) |
| 209 | + |
| 210 | +[《表级复制(base on trigger) -- multi master replication & performance tuning》](../201208/20120831_02.md) |
| 211 | + |
| 212 | +[《表级复制(base on trigger) -- one(rw) to many(ro|rw)》](../201208/20120831_01.md) |
| 213 | + |
| 214 | +[《PostgreSQL 跟踪DDL时间 - cann't use pg_class's trigger trace user_table's create,modify,delete Time》](../201206/20120626_01.md) |
| 215 | + |
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| 217 | + |
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