14 /// 执行存储过程所要提供的参数名称及参数值.多个条段以逗号分割. 15 /// 选择要返回的存储过程返回多个结果集中的索引.以0开始. 16 [Microsoft.SqlServer.Server.SqlProcedure] 17 public static void ZDFHJGJ(SqlString Sql, SqlString Params, SqlInt32 returnidex) 18 { 19 //检查存储过程名称是否赋...
*/#defineFIELDNO_EXPRSTATE_RESULTSLOT4TupleTableSlot*resultslot;/* * Instructions to compute expression's return value. */struct ExprEvalStep*steps;/* * Function that actually evaluates the expression. This can be set to * different values depending on the complexity of the expression. */ExprS...
1createorreplacefunctionfn_test4()returnsvoidas23$$45declare67v_value1varchar;89v_value2int:=100;1011v_value3varchardefault'瀚高3';1213v_value4varcharnotnull:='瀚高4';1415v_value5varcharnotnulldefault'瀚高5';1617begin1819raise notice'v_value1=%',v_value1;2021raise notice'v_value2=%'...
CREATE [OR REPLACE] FUNCTION function_name [ (argment [ { IN | IN OUT }] Type, argment [ { IN | OUT | IN OUT } ] Type ] [ AUTHID DEFINER | CURRENT_USER ] RETURN return_type { IS | AS } <类型.变量的说明> BEGIN FUNCTION_body EXCEPTION 其它语句 END; 1. 2. 3. 4. 5. 6...
-- Insert the result into the games table INSERT INTO games (player, opponent, result) VALUES (player, opponent_move, game_result); -- Render the result text using the render_result_text function SELECT render_result_text(opponent_move, game_result) INTO result_text; RETURN result_tex...
/** smgropen() -- Return an SMgrRelation object, creating it if need be.** In versions of PostgreSQL prior to 17, this function returned an object* with no defined lifetime. Now, however, the object remains valid for the* lifetime of the transaction, up to the point where AtEOXact_...
在PostgreSQL中,除了标准 SQL 语句之外,通过创建复杂的过程和函数来满足程序需要,我们称为存储过程和自定义函数(User-Defined Function)。它有助于您执行通常在数据库中的单个函数中进行多次查询和往返操作的操作。 PL/pgSQL 简单易学,无论是否具有编程基础都能够很快学会。PL/pgSQL 存储过程,它和 Oracle PL/SQL 非...
Each of the aggregates listed inTable 9-52is associated with a window function of the same name defined inSection 9.21. In each case, the aggregate result is the value that the associated window function would have returned for the"hypothetical"row constructed from args, if such a row had ...
在PostgreSQL 中,除了标准 SQL 语句之外还支持使用各种过程语言(例如 PL/pgSQL、C、PL/Tcl、PL/Python、PL/Perl、PL/Java 等 )创建复杂的过程和函数,称为存储过程(Stored Procedure)和自定义函数(User-Defined Function)。存储过程支持许多过程元素,例如控制结构、循环和复杂的计算。 使用存储过程带来的好处包括: ...
CREATE OR REPLACE FUNCTION update_timestamp() RETURNS TRIGGER AS $$ BEGIN NEW.update_at = CURRENT_TIMESTAMP; RETURN NEW; END; $$ LANGUAGE plpgsql;然后,创建触发器来调用这个函数:CREATE TRIGGER update_timestamp_trigger BEFORE UPDATE ON your_table FOR EACH ROW EXECUTE PROCEDURE update_timestamp()...