MySQL select 语句中带有变量的游标

Question

我在存储过程中有以下代码：

</p>

<pre><code>DECLARE done INT DEFAULT FALSE;
declare v_degree int(11);
declare v_start_age smallint(6);
declare v_end_age smallint(6);
declare v_gender varchar(20);
declare v_calctable varchar(200);

SELECT calculationtable into v_calctable FROM wac.degrees where tablename = concat("cdb_" + arg_tablename);

declare cur CURSOR for select degree, start_age, end_age, belt, gender from v_calctable;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

像这样，我会在行 "SELECT calculationtable into v_calctable FROM wac.degrees where tablename = concat("cdb_" + arg_tablename);"

中得到一个语法错误

如果我把它放在 "Declare cursor" 之后没有语法错误，但我需要在 de Cursor select 语句中使用结果。

我怎样才能做到这一点？

谢谢。

Answer 1

CREATE DEFINER=`root`@`localhost` PROCEDURE `my_procedure`()
BEGIN
DECLARE done INT DEFAULT FALSE;
declare v_degree int(11);
declare v_start_age smallint(6);
declare v_end_age smallint(6);
declare v_gender varchar(20);
declare v_calctable varchar(200);

SELECT calculationtable into v_calctable FROM wac.degrees where tablename = concat("cdb_" + arg_tablename);
begin                                                                   -- write here begin keyword
declare cur CURSOR for select degree, start_age, end_age, belt, gender from v_calctable;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
end;                                                                    -- end here inner block

END

当您通过另一个 begin 和 end 关键字使用内部块时那么它就没有语法任务错误。但是这个程序是否给你正确的结果我不清楚

MySQL select 语句中带有变量的游标

MySQL Cursor with a variable in select statement

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