我正在尝试使用一些数据来创建数据库。我不需要1M +记录来做我需要的,所以我只有10000行就可以了。
我想我可以使用存储过程遍历所有表并手动创建每个表并仅插入10000行。
我创建了一个像这样的存储过程
CREATE DEFINER=`root`@`10.%` PROCEDURE `createNewDatabase`(in db_name varchar(100), in new_db_name varchar(100))
BEGIN
DECLARE finish INT DEFAULT 0;
DECLARE tbl VARCHAR(100);
DECLARE cur_tables CURSOR FOR SELECT table_name FROM information_schema.tables WHERE table_schema = db_name AND TABLE_TYPE='BASE TABLE';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET finish = 1;
OPEN cur_tables;
my_loop: LOOP
FETCH cur_tables INTO tbl;
IF finish = 1 THEN
LEAVE my_loop;
END IF;
SET @str = CONCAT('DROP TABLE IF EXISTS `', new_db_name, '`.`' , tbl , '`; CREATE TABLE `', new_db_name, '`.`' , tbl , '` LIKE `', db_name , '`.`', tbl,'`; INSERT INTO `', new_db_name , '`.`' , tbl, '` SELECT * FROM `', db_name ,'`.`', tbl , '` LIMIT 10000;');
PREPARE stmt FROM @str;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END LOOP;
CLOSE cur_tables;
END
然后我这样称呼它
CALL createNewDatabase
('baseTable','newTable');
但我运行程序时出现以下错误
Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'CREATE TABLE `newTable`.`account_addresses` LIKE `baseTable`.`account_addres' at line 1
如果我在准备声明之前添加了以下2行
SELECT @str;
LEAVE my_loop;
如果我手动执行这些查询,我会得到以下查询
DROP TABLE IF EXISTS `newTable`.`account_addresses`;
CREATE TABLE `newTable`.`account_addresses` LIKE `baseTable`.`account_addresses`;
INSERT INTO `newTable`.`account_addresses` SELECT * FROM `newTable`.`account_addresses` LIMIT 10000;
CREATE TABLE `newTable`.`account_addresses` LIKE `baseTable`.`account_addresses`; INSERT INTO `newTable`.`account_addresses` SELECT * FROM `baseTable`.`account_addresses` LIMIT 10000;
我在这里做错了什么?为什么会出错?
答案 0 :(得分:0)
引用mysql在PREPARE上的文档:
文本必须代表单个陈述,而不是多个陈述。
您正在尝试执行drop table和create table语句,在1个预准备语句中插入记录,这是不允许的。为3个命令准备3个单独的准备语句。