240 lines
11 KiB
SQL
240 lines
11 KiB
SQL
drop schema if exists dependent_view cascade;
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create schema dependent_view;
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set current_schema = dependent_view;
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-- test 1：视图
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-- 创建基表
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DROP TABLE IF EXISTS base_table;
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CREATE TABLE base_table
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(
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base_table_id INTEGER,
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base_table_field NUMERIC(10,4)
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);
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-- 插入数据
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insert into base_table values (1,1);
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insert into base_table values (2,2);
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-- 创建第一层直接引用表字段的视图对象master_viewx
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DROP VIEW IF EXISTS master_view1;
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CREATE OR REPLACE VIEW master_view1 AS
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SELECT
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base_table_id AS id,
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base_table_field AS field
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FROM base_table;
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DROP VIEW IF EXISTS master_view2;
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CREATE OR REPLACE VIEW master_view2 AS
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SELECT
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base_table_field AS field
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FROM base_table;
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DROP VIEW IF EXISTS master_view3;
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CREATE OR REPLACE VIEW master_view3 AS
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SELECT
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base_table_id AS id
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FROM base_table;
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-- 创建第二层间接引用表字段的视图对象dependent_viewx
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DROP VIEW IF EXISTS dependent_view1;
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CREATE OR REPLACE VIEW dependent_view1 AS
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SELECT
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id AS dependent_id,
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field AS dependent_field
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FROM master_view1;
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DROP VIEW IF EXISTS dependent_view2;
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CREATE OR REPLACE VIEW dependent_view2 AS
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SELECT
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id AS dependent_id
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FROM master_view1;
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DROP VIEW IF EXISTS dependent_view3;
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CREATE OR REPLACE VIEW dependent_view3 AS
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SELECT
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field AS dependent_field
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FROM master_view1;
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DROP VIEW IF EXISTS dependent_view4;
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CREATE OR REPLACE VIEW dependent_view4 AS
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SELECT
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field AS dependent_field1
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FROM master_view2;
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DROP VIEW IF EXISTS dependent_view5;
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CREATE OR REPLACE VIEW dependent_view5 AS
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SELECT
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id AS dependent_id
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FROM master_view3;
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-- 创建第三层间接引用表字段的视图对象second_dependent_viewx
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DROP VIEW IF EXISTS second_dependent_view1;
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CREATE OR REPLACE VIEW second_dependent_view1 AS
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SELECT
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dependent_id AS sec_dependent_id,
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dependent_field AS sec_dependent_field
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FROM dependent_view1;
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DROP VIEW IF EXISTS second_dependent_view2;
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CREATE OR REPLACE VIEW second_dependent_view2 AS
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SELECT
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dependent_id AS sec_dependent_id
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FROM dependent_view2;
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DROP VIEW IF EXISTS second_dependent_view3;
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CREATE OR REPLACE VIEW second_dependent_view3 AS
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SELECT
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dependent_field AS sec_dependent_field
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FROM dependent_view3;
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-- 初始valid字段为true
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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-- 修改表字段类型，预期视图失效，查询无效视图成功
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ALTER TABLE base_table ALTER COLUMN base_table_field TYPE VARCHAR(32);
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from second_dependent_view3;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- 修改表字段长度，预期视图失效，查询无效视图成功
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ALTER TABLE base_table ALTER COLUMN base_table_field TYPE VARCHAR(64);
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from second_dependent_view3;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- 删除表字段，预期视图失效，查询无效视图报错
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ALTER TABLE base_table DROP COLUMN base_table_field;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from second_dependent_view3;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- 重新插入表字段，预期失效的视图被查询时恢复有效，引用链上的父视图也恢复有效状态
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ALTER TABLE base_table ADD base_table_field INTEGER;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from second_dependent_view3;
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select * from dependent_view3;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- 删除整个表，预期报错
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DROP TABLE base_table;
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-- 删除整个表，预期成功
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DROP TABLE base_table CASCADE;
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-- test2：物化视图
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DROP TABLE IF EXISTS base_table;
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CREATE TABLE base_table
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(
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base_table_id INTEGER,
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base_table_field NUMERIC(10,4)
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);
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-- 插入数据
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insert into base_table values (1,1);
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insert into base_table values (2,2);
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DROP MATERIALIZED VIEW IF EXISTS master_view1;
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CREATE MATERIALIZED VIEW master_view1 AS
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SELECT
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base_table_id AS id,
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base_table_field AS field
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FROM base_table;
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-- 插入新数据
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insert into base_table values (3,3);
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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-- 重命名表字段，预期修改后查询到原数据
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ALTER TABLE base_table rename COLUMN base_table_id to id;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from master_view1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- 修改表字段类型，预期修改后查询到原数据
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ALTER TABLE base_table ALTER COLUMN id TYPE VARCHAR(32);
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from master_view1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- 删除表字段，预期修改后查询到原数据
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ALTER TABLE base_table DROP COLUMN base_table_field;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from master_view1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- 刷新物化视图，预期报错
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REFRESH MATERIALIZED VIEW master_view1;
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-- 重新添加表字段，刷新物化视图，预期查询到同步后数据
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ALTER TABLE base_table ADD base_table_field INTEGER;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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REFRESH MATERIALIZED VIEW master_view1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from master_view1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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\d base_table
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-- test 3: join方式创建视图
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drop view if exists v_view_independent_1;
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drop table if exists t_view_independent_1;
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drop table if exists t_view_independent_2;
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create table t_view_independent_1(c1 int primary key,c2 text);
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insert into t_view_independent_1 select a,a || 'x' from generate_series(1,3) as a;
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create table t_view_independent_2(c1 int primary key,c2 text);
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insert into t_view_independent_2 select a,a || 'y' from generate_series(2,4) as a;
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create view v_view_independent_1(vc1,vc2,vc3,vc4) as select * from t_view_independent_1 a inner join t_view_independent_2 b on a.c1 = b.c1 ;
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select * from v_view_independent_1;
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--- 删除字段
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ALTER TABLE t_view_independent_1 DROP COLUMN c2;
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--- 查看视图为失效状态
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from v_view_independent_1;
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ALTER TABLE t_view_independent_1 ADD COLUMN c2 text;
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--- 查询视图
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select * from v_view_independent_1;
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-- 查看视图为有效状态
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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--- 修改字段类型
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ALTER TABLE t_view_independent_1 ALTER COLUMN c1 TYPE text;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from v_view_independent_1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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--- 删除字段类型
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ALTER TABLE t_view_independent_2 DROP COLUMN c1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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select * from v_view_independent_1;
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ALTER TABLE t_view_independent_2 ADD COLUMN c1 text;
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select * from v_view_independent_1;
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select relname, object_type, valid from pg_object join pg_class on object_oid=oid and relnamespace = (select Oid from pg_namespace where nspname='dependent_view') order by object_oid;
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--- 清理环境
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drop view v_view_independent_1;
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drop table t_view_independent_1;
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drop table t_view_independent_2;
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-- test4 circular dependency
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create table circular_dependency_t(a int);
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create or replace rule "_RETURN" as on select to circular_dependency_t do instead (select * from circular_dependency_t);
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create or replace view circular_dependency_v as select * from circular_dependency_t;
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select * from circular_dependency_t; -- failed
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select * from circular_dependency_v; -- failed
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create table circular_dependency_t1 (id int, name text);
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create view circular_dependency_v1 as select * from circular_dependency_t1;
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create view circular_dependency_v2 as select * from circular_dependency_v1;
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create or replace view circular_dependency_v2 as select * from circular_dependency_v1 union all select * from circular_dependency_v2;
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alter table circular_dependency_t1 modify id int8;
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select * from circular_dependency_v2; -- failed
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create table circular_dependency_t2 (id int, name text);
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create view circular_dependency_v3 as select * from circular_dependency_t2;
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create view circular_dependency_v4 as select * from circular_dependency_v3;
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create or replace view circular_dependency_v3 as select * from circular_dependency_t2 union all select * from circular_dependency_v4;
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alter table circular_dependency_t2 modify id int8; -- failed
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--- clean
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drop schema dependent_view cascade;
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