Expanding on how transactions work inside procedures, there is currently an oddity with the transaction timestamp, which for example you can see inxact_start. When we expand the procedure like this: CREATEPROCEDUREmy_table_task()LANGUAGEplpgsqlAS$$DECLAREclock_strTEXT;tx_strTEXT;BEGINCREATETABLEtab...
CREATE OR REPLACE PROCEDURE insert_new_user() LANGUAGE plpgsql AS $$ BEGIN INSERT INTO users (name, email) VALUES ('John Doe', 'john.doe@example.com'); END; $$; 这个存储过程insert_new_user在users表中插入了一个新用户。 4. 解释如何调用PostgreSQL存储过程 在PostgreSQL中,存储过程可以通过CAL...
For example, Oracle-specific JDBC exceptions need to be replaced with either generic cross-database exceptions or Postgres-specific ones. Ensuring your Postgres database handles transactions and errors correctly is a critical part of the migration process and usually requires a care...
例如,假设有一个名为users的表,其中包含一个名为trigger_example的触发器。你可以执行以下命令来手动调用触发器: 这里的column_name是表中的任意列名。通过将列设置为其当前值,不会实际更改任何数据,但会触发触发器的执行。 执行更新操作后,触发器将在每一行上执行定义的操作。你可以在触发器的定义中指定要执行...
For example, if you have a table with two columns—id and value—and a stored procedure that adds one to each value in the table, you could write the following two functions to test this procedure: CREATEFUNCTIONunit_tests.add_one_positive()RETURNStest_resultAS$$ ...
This example uses theAUTHID DEFINERandSETclauses in a procedure declaration. Theupdate_salaryprocedure conveys the privileges of the role that defined the procedure to the role that's calling the procedure while the procedure executes. → WrapCopy ...
Stored procedures (sprocs) There are also functions that make it easy to call a stored procedure with a given set of arguments. Consider a database that has the following sproc defined: CREATE PROCEDURE insert_data (ainteger, binteger) LANGUAGE SQLBEGINATOMICINSERT INTOtblVALUES(a);INSERT IN...
Example: Stored Procedure --- CREATE PROCEDURE Test (n varying character,val REAL) DECLARE cid INTEGER; BEGIN SELECT custid INTO cid FROM account WHERE name=n; UPDATE checking SET balance=balance-val WHERE custid=cid; END; JDBC Code --...
For all intents and purposes, PostgreSQL has less of a need for CREATE PROCEDURE than other databases aside from looking more like other databases. For example in SQL Server -> 2005 - although you can write functions that return tables and so forth, you have to resort to writing CLR functi...
introduced as well and only applies to plpgsql written functions. This is both an easier as well as a more efficient way of returning query results in plpgsql functions. Hubert Lubazeuwski provides an example of this inset returning functions in 8.3. We shall provide yet another example of ...