在PostgreSQL 中,除了标准 SQL 语句之外还支持使用各种过程语言(例如 PL/pgSQL、C、PL/Tcl、PL/Python、PL/Perl、PL/Java 等 )创建复杂的过程和函数,称为存储过程(Stored Procedure)和自定义函数(User-Defined Function)。存储过程支持许多过程元素,例如控制结构、循环和复杂的计算。 使用存储过程带来的好处包括: ...
If your stored procedure does not accept any parameters, you can omit the second argument like this: cur.execute("CALL sp_name);") After that, call the commit() method to commit the transaction: conn.commit(); Finally, call the close() method of the cursor and connection objects to clo...
事务(Transaction):事务是数据库操作的一个基本单元,具有原子性、一致性、隔离性和持久性(ACID 属性)。在 PostgreSQL 中,事务可以包含多个 SQL 语句,这些语句要么全部成功执行,要么在遇到错误时全部回滚。 并发控制:PostgreSQL 使用多版本并发控制(MVCC)来实现高并发读写操作。MVCC 通过为每个事务提供数据库的快照来避...
What is a stored procedure?PostgreSQL allows you to extend the database functionality with user-defined functions by using various procedural languages, which are often referred to as stored procedures.With stored procedures you can create your own custom functions and reuse them in applications or ...
CREATE OR REPLACE PROCEDURE public.proc1(pid integer, pname text) LANGUAGE sql AS $procedure$ INSERT INTO tbl(id, name) VALUES (pid, pname); $procedure$ PROCDEURE 目前还不支持自治事务(autonomous transaction)。 相关参考文档: CREATE PROCEDURE ...
首先是事务管理(Transaction Management),PostgreSQL支持ACID(原子性、一致性、隔离性、持久性)特性,确保数据操作的安全性和可靠性。用户可以通过BEGIN、COMMIT、ROLLBACK等命令显式地控制事务的开始、提交和回滚,从而实现复杂的业务逻辑。其次是复制(Replication)和故障转移(Failover)机制,PostgreSQL支持多种复制方式,如流...
procedure_demo-# LANGUAGE plpgsql ;CREATEPROCEDUREprocedure_demo=#calldisplay_message('This is my test case');NOTICE: Procedure Parameter: This is my test case msg---This is my test case (1 row) 3. Using transaction control procedure_demo=#CREATEORREPLACE...
create procedure qiantaoProc @asd nchar(10) as begin begin try begin transaction innerTrans save transaction savepoint --创建事务保存点 insert into shiwu (asd) values (@asd); commit transaction innerTrans end try begin catch rollback transaction savepoint --回滚到保存点 ...
Functions can be called from a procedureStored procedures can’t be called from a function Functions can’t be used for transaction management in SQLStored procedures can be used for transaction management in SQL Functions don’t affect the state of a database since they don’t perform CRUD op...
存储过程和transaction How to rollback a transaction in a stored procedure? BEGINTRANSACTION;BEGINTRY--Some codeCOMMITTRANSACTION;ENDTRYBEGINCATCHROLLBACKTRANSACTION;ENDCATCH; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 执行的存储过程需要transaction的话,在调用的时候传入...