WITH READ ONLY
适用于 ✅ 开源版 ✅ 专业版 ✅ 企业版
可更新视图的 CREATE VIEW 语句可以附加 WITH READ ONLY
子句,以确保它不能被更新。
// Create a new view create.createView("authors", "author_id", "first_name", "last_name") .as(select(AUTHOR.ID, AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME) .from(AUTHOR) .withReadOnly()) .execute();
该标志设置在SELECT
对象上,而不是CREATE VIEW
语句上,因为它也可用于内联视图。
方言支持
此示例使用 jOOQ
createView("a", "id").as(select(AUTHOR.ID).from(AUTHOR).withReadOnly())
翻译成以下特定方言的表达式
访问
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM ( SELECT count(*) dual FROM MSysResources ) AS dual WHERE 1 = 0
ASE, Redshift, SQLDataWarehouse, SQLServer, SQLite, Vertica
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL WHERE 1 = 0
Aurora MySQL
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM DUAL WHERE 1 = 0
Aurora Postgres, Postgres, YugabyteDB
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT CAST(NULL AS int) WHERE FALSE
BigQuery
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION DISTINCT SELECT NULL FROM UNNEST([STRUCT(1 AS dual)]) AS dual WHERE FALSE
CockroachDB, H2, MariaDB, MySQL, Snowflake
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL WHERE FALSE
DB2
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM SYSIBM.DUAL WHERE 1 = 0
Derby
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT CAST(NULL AS int) FROM SYSIBM.SYSDUMMY1 WHERE FALSE
Exasol
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM DUAL WHERE FALSE
Firebird
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM RDB$DATABASE WHERE 1 = 0
Hana, Oracle
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR WITH READ ONLY
HSQLDB
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT CAST(NULL AS int) FROM (VALUES (1)) AS dual (dual) WHERE FALSE
Informix
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM ( SELECT 1 AS dual FROM systables WHERE (tabid = 1) ) AS dual WHERE 1 = 0
MemSQL
CREATE VIEW a AS SELECT t.id FROM ( SELECT t.* FROM ( SELECT AUTHOR.ID id FROM AUTHOR UNION SELECT NULL FROM DUAL WHERE 1 = 0 ) t ) t
Sybase
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM SYS.DUMMY WHERE 1 = 0
Teradata
CREATE VIEW a(id) AS SELECT AUTHOR.ID FROM AUTHOR UNION SELECT NULL FROM ( SELECT 1 AS "dual" ) AS "dual" WHERE 1 = 0
ClickHouse, Databricks, DuckDB, Trino
/* UNSUPPORTED */
使用 jOOQ 3.21 生成。早期 jOOQ 版本的支持可能有所不同。 在我们的网站上翻译您自己的 SQL
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