MySQL: 光标似乎永远不会结束

Question

我正在与 Aurora/MySQL 合作。我有一个光标，它似乎从来没有 finish/complete。

真正让我困惑的是我在网上看到的示例，我从未看到它们将 "done" 或 "finish" 变量设置为 1。下面是我的脚本。

DELIMITER $$

DROP PROCEDURE IF EXISTS mass_backup $$

CREATE PROCEDURE mass_backup () 
    BEGIN
        DECLARE copy_table VARCHAR(255);
        DECLARE done BOOLEAN DEFAULT 0;
        DECLARE table_cursor CURSOR FOR
            SELECT table_name FROM information_schema.tables WHERE table_schema='app_prod_schema';
        DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done=1;

        OPEN table_cursor;

        REPEAT
            FETCH table_cursor INTO copy_table;
            SELECT copy_table;
            SET @var1 = copy_table;
            SET @copySql = CONCAT('SELECT * FROM ',@var1,' INTO OUTFILE S3 ''''s3://somebucket.com-work-bucket/''', @var1 , 
                    '.csv', 'FIELDS TERMINATED BY '','' LINES TERMINATED BY ''\n''' );
            SELECT @copySql;
        UNTIL done END REPEAT;
        CLOSE table_cursor;
    END $$

DELIMITER ;

CALL mass_backup()

为什么这个光标要永远运行？非常感谢任何帮助。

Answer 1

我认为我在重复循环中的 SELECT 正在弄乱 "No more rows" 处理程序。我删除了 REPEAT 并放入一个循环。这似乎很有魅力，可以提供我期望的陈述。

DELIMITER $$

DROP PROCEDURE IF EXISTS mass_backup $$

CREATE PROCEDURE mass_backup () 
    BEGIN
        DECLARE copy_table VARCHAR(255);
        DECLARE done BOOLEAN DEFAULT 0;
        DECLARE table_cursor CURSOR FOR
            SELECT table_name FROM information_schema.tables WHERE table_schema='app_prod_schema' ORDER BY table_name;
        DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done=1;

        DROP TEMPORARY TABLE IF EXISTS stmtsTable;
        CREATE TEMPORARY TABLE stmtsTable (backupStmt varchar(200));

        OPEN table_cursor;
        curloop:
        LOOP
            FETCH table_cursor INTO copy_table;
                IF done THEN
            LEAVE curloop;
            END IF;
            #SELECT copy_table;
            SET @var1 = copy_table;
            SET @copySql = CONCAT('SELECT * FROM ',@var1,' INTO OUTFILE S3 \'s3://somebucket/dbbackups/', @var1 , 
                    '.csv\'', ' FIELDS TERMINATED BY \',\' LINES TERMINATED BY \'\n\'' );
            INSERT INTO stmtsTable(backupStmt)             
            SELECT @copySql;
        END LOOP;
        CLOSE table_cursor;
        SELECT * FROM stmtsTable;
END $$

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