Mysql 5.7 存储过程错误

Question

我正在尝试创建以下格式的存储过程：分隔符 $$

CREATE PROCEDURE `CreateInsertLocation` (tableName VARCHAR(255),ts BIGINT(20),systs INT(20),lat FLOAT,lon FLOAT)
BEGIN
    DECLARE FoundCount INT;

    SELECT COUNT(1) INTO FoundCount
    FROM information_schema.tables
    WHERE table_schema = 'DB'
    AND table_name = tableName;

    IF FoundCount = 1 THEN SET @sql = CONCAT('INSERT INTO ',tableName,'
        (timestamp, lattitude, longitude,systime) 
    VALUES
        (','ts','lat','lon','systs')');
PREPARE stmt FROM @sql; 
    EXECUTE stmt;

ELSE 
    SET @sql = CONCAT('CREATE TABLE `',tableName,'`(
        `id` bigint(20) NOT NULL DEFAULT '0', 
        `timestamp` bigint(20) NOT NULL DEFAULT '0',  
        `lattitude` float NOT NULL DEFAULT '0', 
        `longitude` float NOT NULL DEFAULT '0',
        `systime` bigint(20) DEFAULT NULL, 
        KEY `LocIdx` (`vtuId`,`timestamp`),
        KEY `SysIdx` (`vtuId`,`systime`), 
        PRIMARY KEY (id)'); 
    PREPARE stmt FROM @sql; 
    EXECUTE stmt;

    SET @sql = CONCAT('INSERT INTO ',tableName,'
            (timestamp, lattitude, longitude,systime) 
        VALUES
            (','ts','lat','lon','systs')');
    PREPARE stmt FROM @sql2; 
        EXECUTE stmt;

END 
$$

DELIMITER ;

-- 当我尝试在 Mysql 5.7 中执行此查询时，出现以下错误

  ERROR 1064 (42000): 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 '');
  PREPARE stmt FROM @sql; 
     EXECUTE stmt;

   ELSE SET @sql = CONCAT' at line 10

任何人都可以帮助改进这个糟糕的程序吗？

Answer 1

您在 create table 语句的连接字符串和其中的默认值中使用了单引号 (')。

将默认值放在双引号 (") 中，将它们转义 (\') 或删除它们，因为它们都是数字类型。

编辑： 您的插入语句参数也被放在引号中，这看起来也是错误的。

Answer 2

在标记的评论中，此代码缺少引号以正确完成concat

$$
CREATE PROCEDURE `CreateInsertLocation` (tableName VARCHAR(255),ts BIGINT(20),systs INT(20),lat FLOAT,lon FLOAT)
BEGIN
    DECLARE FoundCount INT;

    SELECT COUNT(1) INTO FoundCount
    FROM information_schema.tables
    WHERE table_schema = 'DB'
    AND table_name = tableName;

    IF FoundCount = 1 THEN SET @sql = CONCAT('INSERT INTO ',tableName,'
        (timestamp, lattitude, longitude,systime) 
    VALUES
        (','ts','lat','lon','systs',')'); /* Error in this line */
PREPARE stmt FROM @sql; 
    EXECUTE stmt;

ELSE 
    SET @sql = CONCAT('CREATE TABLE `',tableName,'`(
        `id` bigint(20) NOT NULL DEFAULT '0', 
        `timestamp` bigint(20) NOT NULL DEFAULT '0',  
        `lattitude` float NOT NULL DEFAULT '0', 
        `longitude` float NOT NULL DEFAULT '0',
        `systime` bigint(20) DEFAULT NULL, 
        KEY `LocIdx` (`vtuId`,`timestamp`),
        KEY `SysIdx` (`vtuId`,`systime`), 
        PRIMARY KEY (id)'); 
    PREPARE stmt FROM @sql; 
    EXECUTE stmt;

    SET @sql = CONCAT('INSERT INTO ',tableName,'
            (timestamp, lattitude, longitude,systime) 
        VALUES
            (','ts','lat','lon','systs')');
    PREPARE stmt FROM @sql2; 
        EXECUTE stmt;

END 
$$

DELIMITER ;

Answer 3

这应该有效。注意单引号的顺序，因为它可能会变得棘手。

DELIMITER $$
CREATE PROCEDURE `CreateInsertLocation` (tableName VARCHAR(255),ts BIGINT(20),systs INT(20),lat FLOAT,lon FLOAT)
    BEGIN
    DECLARE FoundCount INT;

    SELECT COUNT(1) INTO FoundCount
    FROM information_schema.tables
    WHERE table_schema = 'DB'
    AND table_name = tableName;

    IF FoundCount = 1 THEN 
        SET @sql = CONCAT('INSERT INTO ',tableName,' (timestamp, lattitude, longitude,systime) VALUES (',ts, ',', lat, ',', lon, ',', systs, ')' );

        PREPARE stmt FROM @sql; 
        EXECUTE stmt;

    ELSE 
        SET @sql = CONCAT('CREATE TABLE `',tableName,'` (
        `id` bigint(20) NOT NULL DEFAULT 0, 
        `timestamp` bigint(20) NOT NULL DEFAULT 0,  
        `lattitude` float NOT NULL DEFAULT 0, 
        `longitude` float NOT NULL DEFAULT 0,
        `systime` bigint(20) DEFAULT NULL, 
        KEY `LocIdx` (`vtuId`,`timestamp`),
        KEY `SysIdx` (`vtuId`,`systime`), 
        PRIMARY KEY (id) )' ); 

        PREPARE stmt FROM @sql; 
        EXECUTE stmt;
    END IF;

    SET @sql = CONCAT('INSERT INTO ',tableName,' (timestamp, lattitude, longitude,systime) VALUES (',ts, ',', lat , ',', lon, ',', systs, ')');

    PREPARE stmt FROM @sql; 
        EXECUTE stmt;

END 
$$

DELIMITER ;

Answer 4

create schema mine;
use mine;
delimiter $$
CREATE PROCEDURE `CreateInsertLocation` (tableName VARCHAR(255),ts BIGINT(20),systs INT(20),lat FLOAT,lon FLOAT)
BEGIN
    DECLARE FoundCount INT;

    SELECT COUNT(1) INTO FoundCount
    FROM information_schema.tables
    WHERE table_schema = 'DB'
    AND table_name = tableName;

    IF FoundCount = 1 THEN SET @sql = CONCAT('INSERT INTO ',tableName,'
        (timestamp, lattitude, longitude,systime) 
    VALUES
        (','ts','lat','lon','systs\')');
PREPARE stmt FROM @sql; 
    EXECUTE stmt;

ELSE 
    SET @sql = CONCAT('CREATE TABLE ',tableName,'(
        `id` bigint(20) NOT NULL DEFAULT \'0\', 
        `timestamp` bigint(20) NOT NULL DEFAULT \'0\',  
        `lattitude` float NOT NULL DEFAULT \'0\', 
        `longitude` float NOT NULL DEFAULT \'0\',
        `systime` bigint(20) DEFAULT NULL, 
        KEY `LocIdx` (`vtuId`,`timestamp`),
        KEY `SysIdx` (`vtuId`,`systime`), 
        PRIMARY KEY (id)'); 
    PREPARE stmt FROM @sql; 
    EXECUTE stmt;

    SET @sql = CONCAT('INSERT INTO ',tableName,'
            (timestamp, lattitude, longitude,systime) 
        VALUES
            (','ts','lat','lon','systs\')');
    PREPARE stmt FROM @sql2; 
        EXECUTE stmt;

END if;
end
$$
DELIMITER ;

你可以试试上面的代码；

首先你需要转义所有的单引号'

而且您忘记关闭 ENDIF。

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