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我有一個mySQL過程調用另一個過程來構建連接的TEXT字段。當調用外部過程時，我的insert語句給出了「腳本不能爲空」的錯誤。當我自己調用內部過程時，它會返回正確的值。是什麼賦予了？這可能很簡單，但我沒有看到它。爲什麼mySQL程序在程序內調用時返回null，但不是在調用它時自己調用
外部過程
DELIMITER $$
USE `automation`$$
DROP PROCEDURE IF EXISTS `pd_build_script`$$
CREATE DEFINER=`user`@`%` PROCEDURE `pd_build_script`(
IN autom_type INT(3),
IN auto_font VARCHAR(30),
IN auto_design VARCHAR(10),
IN auto_d_only TINYINT(1),
IN auto_job VARCHAR(255),
IN auto_template VARCHAR(75)
)
BEGIN
DECLARE font VARCHAR(30);
DECLARE design_script TEXT;
SELECT indesign_name INTO font FROM automation.`indesign_font` WHERE auto_type = autom_type AND web_name = auto_font;
IF (auto_design = "PD00") THEN
CALL pd00(font, @out_script);
ELSEIF (auto_design = "PD1" OR auto_design = "PD73" OR auto_design = "PD88"
OR auto_design = "PD97") THEN
CALL single_letter_art(font, auto_design, auto_d_only, @out_script);
ELSEIF (auto_design = "PD2") THEN
CALL pd2(font, auto_d_only, @out_script);
ELSEIF (auto_design = "PD3") THEN
CALL pd3(font, auto_d_only, @out_script);
ELSEIF (auto_design = "PD28") THEN
CALL pd28(font, auto_d_only, @out_script);
ELSE
CALL pd_general(font, auto_design, auto_d_only, @out_script);
END IF;
SET design_script = CONCAT("some text", @out_script, "more text");
INSERT INTO automation.`job_script` (job_id, script, batch)
VALUE (auto_job, @out_script, CONCAT('batch text', auto_job));
END$$
DELIMITER ;
INNER程序
DELIMITER $$
USE `automation`$$
DROP PROCEDURE IF EXISTS `pd2`$$
CREATE DEFINER=`user`@`%` PROCEDURE `pd2`(
IN font VARCHAR(30), design_only TINYINT(1), OUT layers TEXT
)
BEGIN
DECLARE layer TEXT;
DECLARE links TEXT;
IF (design_only = 1) THEN
SET layer = "layer text";
ELSE
SET layer = CONCAT("layer text",font,"more layer text");
END IF;
#Set the links for the design.
SET links = "links";
SELECT CONCAT(layer,links) INTO layers;
END$$
DELIMITER ;