概述 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、
procedure_demo=#CREATEORREPLACEPROCEDUREcontrol_transaction() procedure_demo-#LANGUAGEplpgsql procedure_demo-#AS$$ procedure_demo$#DECLAREprocedure_demo$#BEGINprocedure_demo$#CREATETABLEtest1 (idint);procedure_demo$#INSERTINTOtest1VALUES(1);procedure_demo$#COMMIT;procedure_demo$#CREATETABLEtest2 (idint)...
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 ALTER PROCEDURE DROP PROCEDURE CALL...
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...
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...
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...
Npgsql中执行函数并获取返回的游标是很容易实现的，要注意的是需要使用Transaction来保证游标的数据不会丢失，NpgsqCommnd.CommandType要设置为StoredProcedure，示例代码:NpgsqlConnection conn = new NpgsqlConnection("Server=127.0.0.1;Initial Catalog=eeeeee;User id=npgsql_tests;password=npgsql_tests;"...
{ // 开始事务 em.getTransaction().begin(); // 创建存储过程查询 StoredProcedureQuery query = em.createStoredProcedureQuery("get_employee_details"); // 设置输入参数 query.setParameter("employee_id", 1); query.setParameter("company_id", 1); // 注册输出参数 query.registerStoredProcedureParameter...
PostgreSQLJavaAppPostgreSQLJavaAppCall ProcedureReturn ResultCommit Transaction 我们可以通过以下Python代码块来构造存储过程的请求。 importpsycopg2defcall_stored_procedure(proc_name,*args):conn=psycopg2.connect("dbname=test user=postgres password=secret")cur=conn.cursor()query=f"CALL{proc_name}({','.join...