没有默认子句和设定语句的例子 CREATE PROCEDURE p9 () BEGIN DECLARE a INT /* there is no DEFAULT clause */; DECLARE b INT /* there is no DEFAULT clause */; SET a = 5; /* there is a SET statement */ SET b = 5; /* there is a SET statement */ INSERT INTO t VALUES (a); S...
MySQL 5.7 Reference Manual / ... / DECLARE Statement 13.6.3 DECLARE Statement The DECLARE statement is used to define various items local to a program: Local variables. See Section 13.6.4, “Variables in Stored Programs”. Conditions and handlers. See Section 13.6.7, “Condition Handling...
MySQL 8.0 Reference Manual/.../DECLARE Statement 15.6.3 DECLARE Statement TheDECLAREstatement is used to define various items local to a program: Local variables. SeeSection 15.6.4, “Variables in Stored Programs”. Conditions and handlers. SeeSection 15.6.7, “Condition Handling”. ...
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 3 (0 ms taken) 有多少个DECLARE就会报多少次,然后后面就是取不到变量的报错。 这个原因是没有定义delimiter 如下的会报错: CREATE PROCEDURE p8() B...
() BEGIN DECLARE a INT /* there is no DEFAULT clause */; DECLARE b INT /* there is no DEFAULT clause */; SET a = 5; /* there is a SET statement */ SET b = 5; /* there is a SET statement */ INSERT INTO t VALUES (a); SELECT s1 * a FROM t WHERE s1 >= b; END; ...
DECLARE 是MySQL 中的一个语句,主要用于声明局部变量、条件、游标等。它通常用在存储过程(Stored Procedure)、函数(Function)或触发器(Trigger)中。 基础概念 局部变量:在存储过程或函数内部定义的变量,其作用域仅限于该存储过程或函数。 条件:用于定义存储过程中的条件逻辑。 游标:用于在存储过程中遍历结果集。 优势...
The following two procedures are identical functionally, although the tables and fields have been mocked up. Will one be more efficient than the other based on the declaration statement locations? The first segments the declarations based on the input parameter and only functionally declares the curso...
mysql declare用法 mysql declare 用法 MySQL 是一种开源的关系型数据库管理系统,它支持多种编程语 言,如 C、C++、Java、Python 等。在 MySQL 中,DECLARE 语句用 于声明一个变量或一个游标。本文将详细介绍 MySQL DECLARE 语 句的用法。 1. 声明变量 DECLARE 语句可以用于声明一个变量,语法如下: DECLARE variabl...
mysql_error_code值是1146.与条件中参数是一样的。 condition_name 是DECLARE定义的条件名称,就前面定义条件语句 NOT FOUND表示所有以02开头的sqlstate_value值。 SQLEXCEPTION表示所有没有被SQLWARNING或 NOT FOUND捕获的sqlstate_value值。 sp_statement 参数表示要执行存储过程或函数语句。
The problem is related to DECLARE statement, it seems that it is not recognised by mysql parser.. the procedure is this one: CREATE PROCEDURE media_esami(IN matricola INT(10), OUT media INT) BEGIN DECLARE done INT DEFAULT 0; DECLARE tot INT DEFAULT 0; ...